#

API Docs for: 3.10.3
Show: Inherited Protected Private Deprecated

# LazyModelList Class

Extends ModelList
Defined in: `app/js/lazy-model-list.js:10`
Module: lazy-model-list
Parent Module: app

Available since 3.6.0

LazyModelList is a subclass of ModelList that maintains a list of plain JavaScript objects rather than a list of Model instances. This makes it well-suited for managing large amounts of data (on the order of thousands of items) that would tend to bog down a vanilla ModelList.

The API presented by LazyModelList is the same as that of ModelList, except that in every case where ModelList would provide a Model instance, LazyModelList provides a plain JavaScript object. LazyModelList also provides a `revive()` method that can convert the plain object at a given index into a full Model instance.

Since the items stored in a LazyModelList are plain objects and not full Model instances, there are a few caveats to be aware of:

- Since items are plain objects and not Model instances, they contain properties rather than Model attributes. To retrieve a property, use `item.foo` rather than `item.get('foo')`. To set a property, use `item.foo = 'bar'` rather than `item.set('foo', 'bar')`.

- Model attribute getters and setters aren't supported, since items in the LazyModelList are stored and manipulated as plain objects with simple properties rather than YUI attributes.

- Changes made to the plain object version of an item will not trigger or bubble up Model `change` events. However, once an item is revived into a full Model using the `revive()` method, changes to that Model instance will trigger and bubble change events as expected.

- Custom `idAttribute` fields are not supported.

- `id` and `clientId` properties are supported. If an item doesn't have a `clientId` property, one will be generated automatically when the item is added to a LazyModelList.

LazyModelList is generally much more memory efficient than ModelList when managing large numbers of items, and adding/removing items is significantly faster. However, the tradeoff is that LazyModelList is only well-suited for storing very simple items without complex attributes, and consumers must explicitly revive items into full Model instances as needed (this is not done transparently for performance reasons).

## Constructor

### `LazyModelList`

()

Defined in `app/js/lazy-model-list.js:10`

Available since 3.6.0

- Index
- Methods
- Properties
- Attributes
- Events

## Item Index

### Methods

- _add
- _addAttrs
- _addLazyAttr
- _afterIdChange
- _afterModelChange
- _aggregateAttrs
- _attachList
- _attrCfgHash
- _baseDestroy
- _baseInit
- _clear
- _cloneDefaultValue
- _compare
- _defAddFn
- _defAttrChangeFn
- _defDestroyFn
- _defInitFn
- _defRemoveFn
- _defResetFn
- _destroyHierarchy
- _detachList
- _filterAdHocAttrs
- _filterAttrCfgs
- _findIndex
- _fireAttrChange
- _generateClientId
- _getAttr
- _getAttrCfg
- _getAttrCfgs
- _getAttrInitVal
- _getAttrs
- _getClasses
- _getFullType
- _getStateVal
- _getType
- _initAttrHost
- _initAttribute
- _initAttrs
- _initBase
- _initHierarchy
- _initHierarchyData
- _isInList
- _isLazyAttr
- _item
- _modelToObject
- _monitor
- _normAttrVals
- _parse
- _parseType
- _preInitEventCfg
- _protectAttrs deprecated
- _publish
- _remove
- _revive
- _set
- _setAttr
- _setAttrs
- _setAttrVal
- _setStateVal
- _sort
- add
- addAttr
- addAttrs
- addTarget
- after
- attrAdded
- before
- bubble
- comparator
- create
- destroy
- detach
- detachAll
- each
- filter
- fire
- free
- get
- getAsHTML
- getAsURL
- getAttrs
- getByClientId
- getById
- getEvent
- getTargets
- indexOf
- init
- invoke
- isEmpty
- item
- itemsAreEqual deprecated
- load
- map
- modifyAttr
- on
- once
- onceAfter
- parse
- parseType
- publish
- remove
- removeAttr
- removeTarget
- reset
- revive
- set
- setAttrs
- size
- some
- sort
- subscribe deprecated
- sync
- toArray
- toJSON
- toString
- unsubscribe deprecated
- unsubscribeAll deprecated

### Properties

- _allowAdHocAttrs
- _isYUIModelList
- model
- name deprecated

### Attributes

- destroyed
- initialized

### Events

- add
- create
- destroy
- error
- init
- load
- remove
- reset

## Methods

### `_add`

(

- `item`
- `[options]`

)
Object protected

Inherited from ModelList but overwritten in `app/js/lazy-model-list.js:277`

Overrides ModelList#add() to work with plain objects.

#### Parameters:

- `item` Object | Model

  Object or model to add.

- `[options]` Object optional

  Options.

#### Returns:

Object: Added item.

### `_addAttrs`

(

- `cfgs`
- `values`
- `lazy`

)
private

Inherited from AttributeCore: `attribute/js/AttributeCore.js:836`

Implementation behind the public addAttrs method.

This method is invoked directly by get if it encounters a scenario in which an attribute's valueFn attempts to obtain the value an attribute in the same group of attributes, which has not yet been added (on demand initialization).

#### Parameters:

- `cfgs` Object

  An object with attribute name/configuration pairs.

- `values` Object

  An object with attribute name/value pairs, defining the initial values to apply. Values defined in the cfgs argument will be over-written by values in this argument unless defined as read only.

- `lazy` Boolean

  Whether or not to delay the intialization of these attributes until the first call to get/set. Individual attributes can over-ride this behavior by defining a lazyAdd configuration property in their configuration. See addAttr.

### `_addLazyAttr`

(

- `name`
- `[lazyCfg]`

)
private

Inherited from AttributeCore: `attribute/js/AttributeCore.js:382`

Finishes initializing an attribute which has been lazily added.

#### Parameters:

- `name` Object

  The name of the attribute

- `[lazyCfg]` Object optional

  Optional config hash for the attribute. This is added for performance along the critical path, where the calling method has already obtained lazy config from state.

### `_afterIdChange`

(

- `e`

)
protected

Inherited from ModelList: `app/js/model-list.js:1134`

Updates the model maps when a model's `id` attribute changes.

#### Parameters:

- `e` EventFacade

### `_afterModelChange`

(

- `e`

)
protected

Defined in `app/js/lazy-model-list.js:445`

Handles `change` events on revived models and updates the original objects with the changes.

#### Parameters:

- `e` EventFacade

### `_aggregateAttrs`

(

- `allAttrs`

)
Object private

Inherited from BaseCore: `base/js/BaseCore.js:575`

A helper method, used by _initHierarchyData to aggregate attribute configuration across the instances class hierarchy.

The method will protect the attribute configuration value to protect the statically defined default value in ATTRS if required (if the value is an object literal, array or the attribute configuration has cloneDefaultValue set to shallow or deep).

#### Parameters:

- `allAttrs` Array

  An array of ATTRS definitions across classes in the hierarchy (subclass first, Base last)

#### Returns:

Object: The aggregate set of ATTRS definitions for the instance

### `_attachList`

(

- `model`

)
protected

Inherited from ModelList: `app/js/model-list.js:956`

Adds this list as a bubble target for the specified model's events.

#### Parameters:

- `model` Model

  Model to attach to this list.

### `_attrCfgHash`

() private

Inherited from BaseCore: `base/js/BaseCore.js:538`

Utility method to define the attribute hash used to filter/whitelist property mixes for this class for iteration performance reasons.

### `_baseDestroy`

() private

Inherited from BaseCore: `base/js/BaseCore.js:309`

Internal destroy implementation for BaseCore

### `_baseInit`

() private

Inherited from BaseCore: `base/js/BaseCore.js:281`

Internal initialization implementation for BaseCore

### `_clear`

() protected

Inherited from ModelList but overwritten in `app/js/lazy-model-list.js:320`

Overrides ModelList#clear() to support `this._models`.

### `_cloneDefaultValue`

(

- `cfg`

)
private

Inherited from BaseCore: `base/js/BaseCore.js:549`

This method assumes that the value has already been checked to be an object. Since it's on a critical path, we don't want to re-do the check.

#### Parameters:

- `cfg` Object

### `_compare`

(

- `a`
- `b`

)
Number protected

Inherited from ModelList: `app/js/model-list.js:984`

Available since 3.5.0

Compares the value a to the value b for sorting purposes. Values are assumed to be the result of calling a model's `comparator()` method. You can override this method to implement custom sorting logic, such as a descending sort or multi-field sorting.

#### Parameters:

- `a` Mixed

  First value to compare.

- `b` Mixed

  Second value to compare.

#### Returns:

Number: `-1` if a should come before b, `0` if they're equivalent, `1` if a should come after b.

### `_defAddFn`

(

- `e`

)
protected

Inherited from ModelList but overwritten in `app/js/lazy-model-list.js:469`

Overrides ModelList#_defAddFn() to support plain objects.

#### Parameters:

- `e` EventFacade

### `_defAttrChangeFn`

(

- `e`

)
private

Inherited from AttributeObservable: `attribute/js/AttributeObservable.js:186`

Default function for attribute change events.

#### Parameters:

- `e` EventFacade

  The event object for attribute change events.

### `_defDestroyFn`

(

- `e`

)
protected

Inherited from BaseObservable: `base/js/BaseObservable.js:190`

Default destroy event handler

#### Parameters:

- `e` EventFacade

  Event object

### `_defInitFn`

(

- `e`

)
protected

Inherited from BaseObservable: `base/js/BaseObservable.js:178`

Default init event handler

#### Parameters:

- `e` EventFacade

  Event object, with a cfg property which refers to the configuration object passed to the constructor.

### `_defRemoveFn`

(

- `e`

)
protected

Inherited from ModelList but overwritten in `app/js/lazy-model-list.js:488`

Overrides ModelList#_defRemoveFn() to support plain objects.

#### Parameters:

- `e` EventFacade

### `_defResetFn`

(

- `e`

)
protected

Inherited from ModelList: `app/js/model-list.js:1211`

Default event handler for `reset` events.

#### Parameters:

- `e` EventFacade

### `_destroyHierarchy`

() private

Inherited from BaseCore: `base/js/BaseCore.js:721`

Destroys the class hierarchy for this instance by invoking the destructor method on the prototype of each class in the hierarchy.

### `_detachList`

(

- `model`

)
protected

Inherited from ModelList: `app/js/model-list.js:1002`

Removes this list as a bubble target for the specified model's events.

#### Parameters:

- `model` Model

  Model to detach.

### `_filterAdHocAttrs`

(

- `allAttrs`
- `userVals`

)
Object private

Inherited from BaseCore: `base/js/BaseCore.js:427`

#### Parameters:

- `allAttrs` Object

  The set of all attribute configurations for this instance. Attributes will be removed from this set, if they belong to the filtered class, so that by the time all classes are processed, allCfgs will be empty.

- `userVals` Object

  The config object passed in by the user, from which adhoc attrs are to be filtered.

#### Returns:

Object: The set of adhoc attributes passed in, in the form of an object with attribute name/configuration pairs.

### `_filterAttrCfgs`

(

- `clazz`
- `allCfgs`

)
Object private

Inherited from BaseCore: `base/js/BaseCore.js:356`

A helper method used when processing ATTRS across the class hierarchy during initialization. Returns a disposable object with the attributes defined for the provided class, extracted from the set of all attributes passed in.

#### Parameters:

- `clazz` Function

  The class for which the desired attributes are required.

- `allCfgs` Object

  The set of all attribute configurations for this instance. Attributes will be removed from this set, if they belong to the filtered class, so that by the time all classes are processed, allCfgs will be empty.

#### Returns:

Object: The set of attributes belonging to the class passed in, in the form of an object with attribute name/configuration pairs.

### `_findIndex`

(

- `model`

)
Number protected

Inherited from ModelList: `app/js/model-list.js:1018`

Returns the index at which the given model should be inserted to maintain the sort order of the list.

#### Parameters:

- `model` Model

  The model being inserted.

#### Returns:

Number: Index at which the model should be inserted.

### `_fireAttrChange`

(

- `attrName`
- `subAttrName`
- `currVal`
- `newVal`
- `opts`
- `[cfg]`

)
private

Inherited from AttributeObservable: `attribute/js/AttributeObservable.js:120`

Utility method to help setup the event payload and fire the attribute change event.

#### Parameters:

- `attrName` String

  The name of the attribute

- `subAttrName` String

  The full path of the property being changed, if this is a sub-attribute value being change. Otherwise null.

- `currVal` Any

  The current value of the attribute

- `newVal` Any

  The new value of the attribute

- `opts` Object

  Any additional event data to mix into the attribute change event's event facade.

- `[cfg]` Object optional

  The attribute config stored in State, if already available.

### `_generateClientId`

() String protected

Defined in `app/js/lazy-model-list.js:336`

Generates an ad-hoc clientId for a non-instantiated Model.

#### Returns:

String: Unique clientId.

### `_getAttr`

(

- `name`

)
Any protected chainable

Inherited from AttributeCore: `attribute/js/AttributeCore.js:543`

Provides the common implementation for the public get method, allowing Attribute hosts to over-ride either method.

See get for argument details.

#### Parameters:

- `name` String

  The name of the attribute.

#### Returns:

Any: The value of the attribute.

### `_getAttrCfg`

(

- `name`

)
Object protected

Inherited from AttributeExtras: `attribute/js/AttributeExtras.js:114`

Returns an object with the configuration properties (and value) for the given attribute. If attrName is not provided, returns the configuration properties for all attributes.

#### Parameters:

- `name` String

  Optional. The attribute name. If not provided, the method will return the configuration for all attributes.

#### Returns:

Object: The configuration properties for the given attribute, or all attributes.

### `_getAttrCfgs`

() Object protected

Inherited from BaseCore: `base/js/BaseCore.js:339`

Returns an aggregated set of attribute configurations, by traversing the class hierarchy.

#### Returns:

Object: The hash of attribute configurations, aggregated across classes in the hierarchy This value is cached the first time the method, or _getClasses, is invoked. Subsequent invocations return the cached value.

### `_getAttrInitVal`

(

- `attr`
- `cfg`
- `initValues`

)
Any private

Inherited from AttributeCore: `attribute/js/AttributeCore.js:945`

Returns the initial value of the given attribute from either the default configuration provided, or the over-ridden value if it exists in the set of initValues provided and the attribute is not read-only.

#### Parameters:

- `attr` String

  The name of the attribute

- `cfg` Object

  The attribute configuration object

- `initValues` Object

  The object with simple and complex attribute name/value pairs returned from _normAttrVals

#### Returns:

Any: The initial value of the attribute.

### `_getAttrs`

(

- `attrs`

)
Object protected

Inherited from AttributeCore: `attribute/js/AttributeCore.js:774`

Implementation behind the public getAttrs method, to get multiple attribute values.

#### Parameters:

- `attrs` Array | boolean

  Optional. An array of attribute names. If omitted, all attribute values are returned. If set to true, all attributes modified from their initial values are returned.

#### Returns:

Object: An object with attribute name/value pairs.

### `_getClasses`

() Function[] protected

Inherited from BaseCore: `base/js/BaseCore.js:323`

Returns the class hierarchy for this object, with BaseCore being the last class in the array.

#### Returns:

Function[]: An array of classes (constructor functions), making up the class hierarchy for this object. This value is cached the first time the method, or _getAttrCfgs, is invoked. Subsequent invocations return the cached value.

### `_getFullType`

(

- `type`

)
String private

Inherited from EventTarget: `event-custom/js/event-target.js:586`

Returns the fully qualified type, given a short type string. That is, returns "foo:bar" when given "bar" if "foo" is the configured prefix.

NOTE: This method, unlike _getType, does no checking of the value passed in, and is designed to be used with the low level _publish() method, for critical path implementations which need to fast-track publish for performance reasons.

#### Parameters:

- `type` String

  The short type to prefix

#### Returns:

String: The prefixed type, if a prefix is set, otherwise the type passed in

### `_getStateVal`

(

- `name`
- `[cfg]`

)
Any private

Inherited from AttributeCore: `attribute/js/AttributeCore.js:600`

Gets the stored value for the attribute, from either the internal state object, or the state proxy if it exits

#### Parameters:

- `name` String

  The name of the attribute

- `[cfg]` Object optional

  Optional config hash for the attribute. This is added for performance along the critical path, where the calling method has already obtained the config from state.

#### Returns:

Any: The stored value of the attribute

### `_getType`

() private

Inherited from EventTarget: `event-custom/js/event-target.js:36`

If the instance has a prefix attribute and the event type is not prefixed, the instance prefix is applied to the supplied type.

### `_initAttrHost`

(

- `attrs`
- `values`
- `lazy`

)
private

Inherited from AttributeCore: `attribute/js/AttributeCore.js:140`

Constructor logic for attributes. Initializes the host state, and sets up the inital attributes passed to the constructor.

#### Parameters:

- `attrs` Object

  The attributes to add during construction (passed through to addAttrs). These can also be defined on the constructor being augmented with Attribute by defining the ATTRS property on the constructor.

- `values` Object

  The initial attribute values to apply (passed through to addAttrs). These are not merged/cloned. The caller is responsible for isolating user provided values if required.

- `lazy` Boolean

  Whether or not to add attributes lazily (passed through to addAttrs).

### `_initAttribute`

() private

Inherited from BaseObservable but overwritten in `base/js/BaseCore.js:254`

Initializes AttributeCore

### `_initAttrs`

(

- `attrs`
- `values`
- `lazy`

)
protected

Inherited from AttributeCore: `attribute/js/AttributeCore.js:1011`

Utility method to set up initial attributes defined during construction, either through the constructor.ATTRS property, or explicitly passed in.

#### Parameters:

- `attrs` Object

  The attributes to add during construction (passed through to addAttrs). These can also be defined on the constructor being augmented with Attribute by defining the ATTRS property on the constructor.

- `values` Object

  The initial attribute values to apply (passed through to addAttrs). These are not merged/cloned. The caller is responsible for isolating user provided values if required.

- `lazy` Boolean

  Whether or not to add attributes lazily (passed through to addAttrs).

### `_initBase`

(

- `config`

)
private

Inherited from BaseCore: `base/js/BaseCore.js:219`

Internal construction logic for BaseCore.

#### Parameters:

- `config` Object

  The constructor configuration object

### `_initHierarchy`

(

- `userVals`

)
private

Inherited from BaseCore: `base/js/BaseCore.js:659`

Initializes the class hierarchy for the instance, which includes initializing attributes for each class defined in the class's static ATTRS property and invoking the initializer method on the prototype of each class in the hierarchy.

#### Parameters:

- `userVals` Object

  Object with configuration property name/value pairs

### `_initHierarchyData`

() private

Inherited from BaseCore: `base/js/BaseCore.js:457`

A helper method used by _getClasses and _getAttrCfgs, which determines both the array of classes and aggregate set of attribute configurations across the class hierarchy for the instance.

### `_isInList`

(

- `item`

)
Boolean protected

Defined in `app/js/lazy-model-list.js:348`

Returns `true` if the given item is in this list, `false` otherwise.

#### Parameters:

- `item` Object

  Plain object item.

#### Returns:

Boolean: `true` if the item is in this list, `false` otherwise.

### `_isLazyAttr`

(

- `name`

)
Boolean private

Inherited from AttributeCore: `attribute/js/AttributeCore.js:369`

Checks whether or not the attribute is one which has been added lazily and still requires initialization.

#### Parameters:

- `name` String

  The name of the attribute

#### Returns:

Boolean: true if it's a lazily added attribute, false otherwise.

### `_item`

(

- `i`

)
Mixed protected

Inherited from ArrayList: `collection/js/arraylist.js:138`

Protected method for optimizations that may be appropriate for API mirroring. Similar in functionality to `item`, but is used by methods added with `ArrayList.addMethod()`.

#### Parameters:

- `i` Integer

  Index of item to fetch

#### Returns:

Mixed: The item appropriate for pass through API methods

### `_modelToObject`

(

- `model`

)
Object protected

Defined in `app/js/lazy-model-list.js:361`

Converts a Model instance into a plain object. If model is not a Model instance, it will be returned as is.

This method differs from Model#toJSON() in that it doesn't delete the `clientId` property.

#### Parameters:

- `model` Model | Object

  Model instance to convert.

#### Returns:

Object: Plain object.

### `_monitor`

(

- `what`
- `eventType`
- `o`

)
private

Inherited from EventTarget: `event-custom/js/event-target.js:658`

This is the entry point for the event monitoring system. You can monitor 'attach', 'detach', 'fire', and 'publish'. When configured, these events generate an event. click -> clickattach, clickdetach, click_publish -- these can be subscribed to like other events to monitor the event system. Inividual published events can have monitoring turned on or off (publish can't be turned off before it it published) by setting the events 'monitor' config.

#### Parameters:

- `what` String

  'attach', 'detach', 'fire', or 'publish'

- `eventType` String | CustomEvent

  The prefixed name of the event being monitored, or the CustomEvent object.

- `o` Object

  Information about the event interaction, such as fire() args, subscription category, publish config

### `_normAttrVals`

(

- `valueHash`

)
Object private

Inherited from AttributeCore: `attribute/js/AttributeCore.js:897`

Utility method to normalize attribute values. The base implementation simply merges the hash to protect the original.

#### Parameters:

- `valueHash` Object

  An object with attribute name/value pairs

#### Returns:

Object: An object literal with 2 properties - "simple" and "complex", containing simple and complex attribute values respectively keyed by the top level attribute name, or null, if valueHash is falsey.

### `_parse`

(

- `response`

)
Object[] protected

Inherited from ModelList: `app/js/model-list.js:1055`

Available since 3.7.0

Calls the public, overrideable `parse()` method and returns the result.

Override this method to provide a custom pre-parsing implementation. This provides a hook for custom persistence implementations to "prep" a response before calling the `parse()` method.

#### Parameters:

- `response` Any

  Server response.

#### Returns:

Object[]: Array of model attribute hashes.

### `_parseType`

() private

Inherited from EventTarget: `event-custom/js/event-target.js:52`

Returns an array with the detach key (if provided), and the prefixed event name from _getType Y.on('detachcategory| menu:click', fn)

### `_preInitEventCfg`

(

- `config`

)
private

Inherited from BaseObservable: `base/js/BaseObservable.js:98`

Handles the special on, after and target properties which allow the user to easily configure on and after listeners as well as bubble targets during construction, prior to init.

#### Parameters:

- `config` Object

  The user configuration object

### `_protectAttrs`

(

- `attrs`

)
Object deprecated protected

Inherited from AttributeCore: `attribute/js/AttributeCore.js:883`

Deprecated: Use `AttributeCore.protectAttrs()` or `Attribute.protectAttrs()` which are the same static utility method.

Utility method to protect an attribute configuration hash, by merging the entire object and the individual attr config objects.

#### Parameters:

- `attrs` Object

  A hash of attribute to configuration object pairs.

#### Returns:

Object: A protected version of the attrs argument.

### `_publish`

(

- `fullType`
- `etOpts`
- `ceOpts`

)
CustomEvent private

Inherited from EventTarget: `event-custom/js/event-target.js:610`

The low level event publish implementation. It expects all the massaging to have been done outside of this method. e.g. the `type` to `fullType` conversion. It's designed to be a fast path publish, which can be used by critical code paths to improve performance.

#### Parameters:

- `fullType` String

  The prefixed type of the event to publish.

- `etOpts` Object

  The EventTarget specific configuration to mix into the published event.

- `ceOpts` Object

  The publish specific configuration to mix into the published event.

#### Returns:

CustomEvent: The published event. If called without `etOpts` or `ceOpts`, this will be the default `CustomEvent` instance, and can be configured independently.

### `_remove`

(

- `item`
- `[options]`

)
Object protected

Inherited from ModelList but overwritten in `app/js/lazy-model-list.js:383`

Overrides ModelList#_remove() to convert Model instances to indices before removing to ensure consistency in the `remove` event facade.

#### Parameters:

- `item` Object | Model

  Object or model to remove.

- `[options]` Object optional

  Options.

#### Returns:

Object: Removed object.

### `_revive`

(

- `index`

)
Model protected

Defined in `app/js/lazy-model-list.js:404`

Revives a single model at the specified index and returns it. This is the underlying implementation for `revive()`.

#### Parameters:

- `index` Number

  Index of the item to revive.

#### Returns:

Model: Revived model.

### `_set`

(

- `name`
- `val`
- `[opts]`

)
Object protected chainable

Inherited from AttributeObservable but overwritten in `attribute/js/AttributeCore.js:427`

Allows setting of readOnly/writeOnce attributes. See set for argument details.

#### Parameters:

- `name` String

  The name of the attribute.

- `val` Any

  The value to set the attribute to.

- `[opts]` Object optional

  Optional data providing the circumstances for the change.

#### Returns:

Object: A reference to the host object.

### `_setAttr`

(

- `name`
- `value`
- `[opts]`
- `force`

)
Object protected chainable

Inherited from AttributeCore: `attribute/js/AttributeCore.js:443`

Provides the common implementation for the public set and protected _set methods.

See set for argument details.

#### Parameters:

- `name` String

  The name of the attribute.

- `value` Any

  The value to set the attribute to.

- `[opts]` Object optional

  Optional data providing the circumstances for the change.

- `force` Boolean

  If true, allows the caller to set values for readOnly or writeOnce attributes which have already been set.

#### Returns:

Object: A reference to the host object.

### `_setAttrs`

(

- `attrs`
- `[opts]`

)
Object protected chainable

Inherited from AttributeObservable but overwritten in `attribute/js/AttributeCore.js:742`

Implementation behind the public setAttrs method, to set multiple attribute values.

#### Parameters:

- `attrs` Object

  An object with attributes name/value pairs.

- `[opts]` Object optional

  Optional data providing the circumstances for the change

#### Returns:

Object: A reference to the host object.

### `_setAttrVal`

(

- `attrName`
- `subAttrName`
- `prevVal`
- `newVal`
- `[opts]`
- `[attrCfg]`

)
Booolean private

Inherited from AttributeCore: `attribute/js/AttributeCore.js:640`

Updates the stored value of the attribute in the privately held State object, if validation and setter passes.

#### Parameters:

- `attrName` String

  The attribute name.

- `subAttrName` String

  The sub-attribute name, if setting a sub-attribute property ("x.y.z").

- `prevVal` Any

  The currently stored value of the attribute.

- `newVal` Any

  The value which is going to be stored.

- `[opts]` Object optional

  Optional data providing the circumstances for the change.

- `[attrCfg]` Object optional

  Optional config hash for the attribute. This is added for performance along the critical path, where the calling method has already obtained the config from state.

#### Returns:

Booolean: true if the new attribute value was stored, false if not.

### `_setStateVal`

(

- `name`
- `value`

)
private

Inherited from AttributeCore: `attribute/js/AttributeCore.js:622`

Sets the stored value for the attribute, in either the internal state object, or the state proxy if it exits

#### Parameters:

- `name` String

  The name of the attribute

- `value` Any

  The value of the attribute

### `_sort`

(

- `a`
- `b`

)
Number protected

Inherited from ModelList: `app/js/model-list.js:1119`

Array sort function used by `sort()` to re-sort the models in the list.

#### Parameters:

- `a` Model

  First model to compare.

- `b` Model

  Second model to compare.

#### Returns:

Number: `-1` if a is less than b, `0` if equal, `1` if greater.

### `add`

(

- `models`
- `[options]`

)
Model | Model[]

Inherited from ArrayList but overwritten in `app/js/model-list.js:208`

Adds the specified model or array of models to this list. You may also pass another ModelList instance, in which case all the models in that list will be added to this one as well.

#### Parameters:

- `models` Model | Model[] | ModelList | Object | Object[]

  Model or array of models to add. May be existing model instances or hashes of model attributes, in which case new model instances will be created from the hashes. You may also pass a ModelList instance to add all the models it contains.

- `[options]` Object optional

  Data to be mixed into the event facade of the `add` event(s) for the added models.

  - `[index]` Number optional

    Index at which to insert the added models. If not specified, the models will automatically be inserted in the appropriate place according to the current sort order as dictated by the `comparator()` method, if any.

  - `[silent=false]` Boolean optional

    If `true`, no `add` event(s) will be fired.

#### Returns:

Model | Model[]: Added model or array of added models.

#### Example:

    // Add a single model instance.
    list.add(new Model({foo: 'bar'}));

    // Add a single model, creating a new instance automatically.
    list.add({foo: 'bar'});

    // Add multiple models, creating new instances automatically.
    list.add([
        {foo: 'bar'},
        {baz: 'quux'}
    ]);

    // Add all the models in another ModelList instance.
    list.add(otherList);

### `addAttr`

(

- `name`
- `config`
- `lazy`

)
Object chainable

Inherited from AttributeCore: `attribute/js/AttributeCore.js:157`

Adds an attribute with the provided configuration to the host object.

The config argument object supports the following properties:

value <Any>
  The initial value to set on the attribute
valueFn <Function | String>

  A function, which will return the initial value to set on the attribute. This is useful for cases where the attribute configuration is defined statically, but needs to reference the host instance ("this") to obtain an initial value. If both the value and valueFn properties are defined, the value returned by the valueFn has precedence over the value property, unless it returns undefined, in which case the value property is used.

  valueFn can also be set to a string, representing the name of the instance method to be used to retrieve the value.

readOnly <boolean>
  Whether or not the attribute is read only. Attributes having readOnly set to true cannot be modified by invoking the set method.
writeOnce <boolean> or <string>
  Whether or not the attribute is "write once". Attributes having writeOnce set to true, can only have their values set once, be it through the default configuration, constructor configuration arguments, or by invoking set.

  The writeOnce attribute can also be set to the string "initOnly", in which case the attribute can only be set during initialization (when used with Base, this means it can only be set during construction)

setter <Function | String>

  The setter function used to massage or normalize the value passed to the set method for the attribute. The value returned by the setter will be the final stored value. Returning Attribute.INVALID_VALUE, from the setter will prevent the value from being stored.

  setter can also be set to a string, representing the name of the instance method to be used as the setter function.

getter <Function | String>

  The getter function used to massage or normalize the value returned by the get method for the attribute. The value returned by the getter function is the value which will be returned to the user when they invoke get.

  getter can also be set to a string, representing the name of the instance method to be used as the getter function.

validator <Function | String>

  The validator function invoked prior to setting the stored value. Returning false from the validator function will prevent the value from being stored.

  validator can also be set to a string, representing the name of the instance method to be used as the validator function.

lazyAdd <boolean>
  Whether or not to delay initialization of the attribute until the first call to get/set it. This flag can be used to over-ride lazy initialization on a per attribute basis, when adding multiple attributes through the addAttrs method.

The setter, getter and validator are invoked with the value and name passed in as the first and second arguments, and with the context ("this") set to the host object.

Configuration properties outside of the list mentioned above are considered private properties used internally by attribute, and are not intended for public use.

#### Parameters:

- `name` String

  The name of the attribute.

- `config` Object

  An object with attribute configuration property/value pairs, specifying the configuration for the attribute.

  NOTE: The configuration object is modified when adding an attribute, so if you need to protect the original values, you will need to merge the object.

- `lazy` Boolean

  (optional) Whether or not to add this attribute lazily (on the first call to get/set).

#### Returns:

Object: A reference to the host object.

### `addAttrs`

(

- `cfgs`
- `values`
- `lazy`

)
Object chainable

Inherited from AttributeCore: `attribute/js/AttributeCore.js:805`

Configures a group of attributes, and sets initial values.

NOTE: This method does not isolate the configuration object by merging/cloning. The caller is responsible for merging/cloning the configuration object if required.

#### Parameters:

- `cfgs` Object

  An object with attribute name/configuration pairs.

- `values` Object

  An object with attribute name/value pairs, defining the initial values to apply. Values defined in the cfgs argument will be over-written by values in this argument unless defined as read only.

- `lazy` Boolean

  Whether or not to delay the intialization of these attributes until the first call to get/set. Individual attributes can over-ride this behavior by defining a lazyAdd configuration property in their configuration. See addAttr.

#### Returns:

Object: A reference to the host object.

### `addTarget`

(

- `o`

)

Inherited from EventTarget: `event-custom/js/event-facade.js:455`

Registers another EventTarget as a bubble target. Bubble order is determined by the order registered. Multiple targets can be specified.

Events can only bubble if emitFacade is true.

Included in the event-custom-complex submodule.

#### Parameters:

- `o` EventTarget

  the target to add

### `after`

(

- `type`
- `fn`
- `[context]`
- `[arg*]`

)
EventHandle

Inherited from EventTarget: `event-custom/js/event-target.js:833`

Subscribe to a custom event hosted by this object. The supplied callback will execute after any listeners add via the subscribe method, and after the default function, if configured for the event, has executed.

#### Parameters:

- `type` String

  The name of the event

- `fn` Function

  The callback to execute in response to the event

- `[context]` Object optional

  Override `this` object in callback

- `[arg*]` Any optional

  0..n additional arguments to supply to the subscriber

#### Returns:

EventHandle: A subscription handle capable of detaching the subscription

### `attrAdded`

(

- `name`

)
Boolean

Inherited from AttributeCore: `attribute/js/AttributeCore.js:341`

Checks if the given attribute has been added to the host

#### Parameters:

- `name` String

  The name of the attribute to check.

#### Returns:

Boolean: true if an attribute with the given name has been added, false if it hasn't. This method will return true for lazily added attributes.

### `before`

()

Inherited from EventTarget: `event-custom/js/event-target.js:870`

Executes the callback before a DOM event, custom event or method. If the first argument is a function, it is assumed the target is a method. For DOM and custom events, this is an alias for Y.on.

For DOM and custom events: type, callback, context, 0-n arguments

For methods: callback, object (method host), methodName, context, 0-n arguments

#### Returns:

detach handle

### `bubble`

(

- `evt`

)
Boolean

Inherited from EventTarget: `event-custom/js/event-facade.js:507`

Propagate an event. Requires the event-custom-complex module.

#### Parameters:

- `evt` CustomEvent

  the custom event to propagate

#### Returns:

Boolean: the aggregated return value from Event.Custom.fire

### `comparator`

(

- `model`

)
Number | String

Inherited from ModelList: `app/js/model-list.js:271`

Define this method to provide a function that takes a model as a parameter and returns a value by which that model should be sorted relative to other models in this list.

By default, no comparator is defined, meaning that models will not be sorted (they'll be stored in the order they're added).

#### Parameters:

- `model` Model

  Model being sorted.

#### Returns:

Number | String: Value by which the model should be sorted relative to other models in this list.

#### Example:

    var list = new Y.ModelList({model: Y.Model});

    list.comparator = function (model) {
        return model.get('id'); // Sort models by id.
    };

### `create`

(

- `model`
- `[options]`
- `[callback]`

)
Model

Inherited from ModelList: `app/js/model-list.js:294`

Creates or updates the specified model on the server, then adds it to this list if the server indicates success.

#### Parameters:

- `model` Model | Object

  Model to create. May be an existing model instance or a hash of model attributes, in which case a new model instance will be created from the hash.

- `[options]` Object optional

  Options to be passed to the model's `sync()` and `set()` methods and mixed into the `create` and `add` event facades.

  - `[silent=false]` Boolean optional

    If `true`, no `add` event(s) will be fired.

- `[callback]` Function optional

  Called when the sync operation finishes.

  - `err` Error

    If an error occurred, this parameter will contain the error. If the sync operation succeeded, err will be falsy.

  - `response` Any

    The server's response.

#### Returns:

Model: Created model.

### `destroy`

() BaseCore chainable

Inherited from BaseObservable but overwritten in `base/js/BaseCore.js:297`

Destroy lifecycle method. Invokes destructors for the class hierarchy.

#### Returns:

BaseCore: A reference to this object

### `detach`

(

- `type`
- `fn`
- `context`

)
EventTarget

Inherited from EventTarget: `event-custom/js/event-target.js:346`

Detach one or more listeners the from the specified event

#### Parameters:

- `type` String | Object

  Either the handle to the subscriber or the type of event. If the type is not specified, it will attempt to remove the listener from all hosted events.

- `fn` Function

  The subscribed function to unsubscribe, if not supplied, all subscribers will be removed.

- `context` Object

  The custom object passed to subscribe. This is optional, but if supplied will be used to disambiguate multiple listeners that are the same (e.g., you subscribe many object using a function that lives on the prototype)

#### Returns:

EventTarget: the host

### `detachAll`

(

- `type`

)

Inherited from EventTarget: `event-custom/js/event-target.js:469`

Removes all listeners from the specified event. If the event type is not specified, all listeners from all hosted custom events will be removed.

#### Parameters:

- `type` String

  The type, or name of the event

### `each`

(

- `callback`
- `[thisObj]`

)
chainable

Inherited from ArrayList but overwritten in `app/js/model-list.js:341`

Available since 3.6.0

Executes the supplied function on each model in this list.

By default, the callback function's `this` object will refer to the model currently being iterated. Specify a `thisObj` to override the `this` object if desired.

Note: Iteration is performed on a copy of the internal array of models, so it's safe to delete a model from the list during iteration.

#### Parameters:

- `callback` Function

  Function to execute on each model.

  - `model` Model

    Model instance.

  - `index` Number

    Index of the current model.

  - `list` ModelList

    The ModelList being iterated.

- `[thisObj]` Object optional

  Object to use as the `this` object when executing the callback.

### `filter`

(

- `[options]`
- `callback`

)
Array | ModelList

Inherited from ArrayList but overwritten in `app/js/model-list.js:373`

Available since 3.5.0

Executes the supplied function on each model in this list. Returns an array containing the models for which the supplied function returned a truthy value.

The callback function's `this` object will refer to this ModelList. Use `Y.bind()` to bind the `this` object to another object if desired.

#### Parameters:

- `[options]` Object optional

  Filter options.

  - `[asList=false]` Boolean optional

    If truthy, results will be returned as a new ModelList instance rather than as an array.

- `callback` Function

  Function to execute on each model.

  - `model` Model

    Model instance.

  - `index` Number

    Index of the current model.

  - `list` ModelList

    The ModelList being filtered.

#### Returns:

Array | ModelList: Array of models for which the callback function returned a truthy value (empty if it never returned a truthy value). If the `options.asList` option is truthy, a new ModelList instance will be returned instead of an array.

#### Example:

    // Get an array containing only the models whose "enabled" attribute is
    // truthy.
    var filtered = list.filter(function (model) {
        return model.get('enabled');
    });

    // Get a new ModelList containing only the models whose "enabled"
    // attribute is truthy.
    var filteredList = list.filter({asList: true}, function (model) {
        return model.get('enabled');
    });

### `fire`

(

- `type`
- `arguments`

)
EventTarget

Inherited from EventTarget: `event-custom/js/event-target.js:695`

Fire a custom event by name. The callback functions will be executed from the context specified when the event was created, and with the following parameters.

If the custom event object hasn't been created, then the event hasn't been published and it has no subscribers. For performance sake, we immediate exit in this case. This means the event won't bubble, so if the intention is that a bubble target be notified, the event must be published on this object first.

The first argument is the event type, and any additional arguments are passed to the listeners as parameters. If the first of these is an object literal, and the event is configured to emit an event facade, that object is mixed into the event facade and the facade is provided in place of the original object.

#### Parameters:

- `type` String | Object

  The type of the event, or an object that contains a 'type' property.

- `arguments` Object*

  an arbitrary set of parameters to pass to the handler. If the first of these is an object literal and the event is configured to emit an event facade, the event facade will replace that parameter after the properties the object literal contains are copied to the event facade.

#### Returns:

EventTarget: the event host

### `free`

(

- `[model]`

)
chainable

Defined in `app/js/lazy-model-list.js:75`

Deletes the specified model from the model cache to release memory. The model won't be destroyed or removed from the list, just freed from the cache; it can still be instantiated again using `revive()`.

If no model or model index is specified, all cached models in this list will be freed.

Note: Specifying an index is faster than specifying a model instance, since the latter requires an `indexOf()` call.

#### Parameters:

- `[model]` Model | Number optional

  Model or index of the model to free. If not specified, all instantiated models in this list will be freed.

### `get`

(

- `name`

)
String[]

Inherited from AttributeCore but overwritten in `app/js/lazy-model-list.js:116`

Overrides ModelList#get() to return a map of property values rather than performing attribute lookups.

#### Parameters:

- `name` String

  Property name.

#### Returns:

String[]: Array of property values.

### `getAsHTML`

(

- `name`

)
String[]

Inherited from ModelList but overwritten in `app/js/lazy-model-list.js:135`

Overrides ModelList#getAsHTML() to return a map of HTML-escaped property values rather than performing attribute lookups.

#### Parameters:

- `name` String

  Property name.

#### Returns:

String[]: Array of HTML-escaped property values.

### `getAsURL`

(

- `name`

)
String[]

Inherited from ModelList but overwritten in `app/js/lazy-model-list.js:154`

Overrides ModelList#getAsURL() to return a map of URL-encoded property values rather than performing attribute lookups.

#### Parameters:

- `name` String

  Property name.

#### Returns:

String[]: Array of URL-encoded property values.

### `getAttrs`

(

- `attrs`

)
Object

Inherited from AttributeCore: `attribute/js/AttributeCore.js:762`

Gets multiple attribute values.

#### Parameters:

- `attrs` Array | boolean

  Optional. An array of attribute names. If omitted, all attribute values are returned. If set to true, all attributes modified from their initial values are returned.

#### Returns:

Object: An object with attribute name/value pairs.

### `getByClientId`

(

- `clientId`

)
Model

Inherited from ModelList: `app/js/model-list.js:504`

Returns the model with the specified clientId, or `null` if not found.

#### Parameters:

- `clientId` String

  Client id.

#### Returns:

Model: Model, or `null` if not found.

### `getById`

(

- `id`

)
Model

Inherited from ModelList: `app/js/model-list.js:515`

Returns the model with the specified id, or `null` if not found.

Note that models aren't expected to have an id until they're saved, so if you're working with unsaved models, it may be safer to call `getByClientId()`.

#### Parameters:

- `id` String | Number

  Model id.

#### Returns:

Model: Model, or `null` if not found.

### `getEvent`

(

- `type`
- `prefixed`

)
CustomEvent

Inherited from EventTarget: `event-custom/js/event-target.js:814`

Returns the custom event of the provided type has been created, a falsy value otherwise

#### Parameters:

- `type` String

  the type, or name of the event

- `prefixed` String

  if true, the type is prefixed already

#### Returns:

CustomEvent: the custom event or null

### `getTargets`

()

Inherited from EventTarget: `event-custom/js/event-facade.js:479`

Returns an array of bubble targets for this object.

#### Returns:

EventTarget[]

### `indexOf`

(

- `needle`

)
Number

Inherited from ArrayList but overwritten in `app/js/lazy-model-list.js:173`

Returns the index of the given object or Model instance in this LazyModelList.

#### Parameters:

- `needle` Model | Object

  The object or Model instance to search for.

#### Returns:

Number: Item index, or `-1` if not found.

### `init`

(

- `cfg`

)
BaseCore chainable

Inherited from BaseObservable but overwritten in `base/js/BaseCore.js:264`

Init lifecycle method, invoked during construction. Sets up attributes and invokes initializers for the class hierarchy.

#### Parameters:

- `cfg` Object

  Object with configuration property name/value pairs

#### Returns:

BaseCore: A reference to this object

### `invoke`

(

- `name`
- `[args*]`

)
Array

Inherited from ModelList: `app/js/model-list.js:530`

Calls the named method on every model in the list. Any arguments provided after name will be passed on to the invoked method.

#### Parameters:

- `name` String

  Name of the method to call on each model.

- `[args*]` Any optional

  Zero or more arguments to pass to the invoked method.

#### Returns:

Array: Array of return values, indexed according to the index of the model on which the method was called.

### `isEmpty`

() Boolean

Inherited from ArrayList: `collection/js/arraylist.js:116`

Is this instance managing any items?

#### Returns:

Boolean: true if 1 or more items are being managed

### `item`

(

- `index`

)
Model

Inherited from ArrayList but overwritten in `app/js/model-list.js:545`

Returns the model at the specified index.

#### Parameters:

- `index` Number

  Index of the model to fetch.

#### Returns:

Model: The model at the specified index, or `undefined` if there isn't a model there.

### `itemsAreEqual`

(

- `a`
- `b`

)
Boolean deprecated

Inherited from ArrayList: `collection/js/arraylist-add.js:68`

Deprecated: Use ModelList or a custom ArrayList subclass

Default comparator for items stored in this list. Used by remove().

#### Parameters:

- `a` Mixed

  item to test equivalence with.

- `b` Mixed

  other item to test equivalance.

#### Returns:

Boolean: true if items are deemed equivalent.

### `load`

(

- `[options]`
- `[callback]`

)
chainable

Inherited from ModelList: `app/js/model-list.js:556`

Loads this list of models from the server.

This method delegates to the `sync()` method to perform the actual load operation, which is an asynchronous action. Specify a callback function to be notified of success or failure.

If the load operation succeeds, a `reset` event will be fired.

#### Parameters:

- `[options]` Object optional

  Options to be passed to `sync()` and to `reset()` when adding the loaded models. It's up to the custom sync implementation to determine what options it supports or requires, if any.

- `[callback]` Function optional

  Called when the sync operation finishes.

  - `err` Error

    If an error occurred, this parameter will contain the error. If the sync operation succeeded, err will be falsy.

  - `response` Any

    The server's response. This value will be passed to the `parse()` method, which is expected to parse it and return an array of model attribute hashes.

### `map`

(

- `fn`
- `[thisObj]`

)
Array

Inherited from ModelList: `app/js/model-list.js:622`

Executes the specified function on each model in this list and returns an array of the function's collected return values.

#### Parameters:

- `fn` Function

  Function to execute on each model.

  - `model` Model

    Current model being iterated.

  - `index` Number

    Index of the current model in the list.

  - `models` Model[]

    Array of models being iterated.

- `[thisObj]` Object optional

  `this` object to use when calling fn.

#### Returns:

Array: Array of return values from fn.

### `modifyAttr`

(

- `name`
- `config`

)

Inherited from AttributeExtras: `attribute/js/AttributeExtras.js:40`

Updates the configuration of an attribute which has already been added.

The properties which can be modified through this interface are limited to the following subset of attributes, which can be safely modified after a value has already been set on the attribute: readOnly, writeOnce, broadcast and getter.

#### Parameters:

- `name` String

  The name of the attribute whose configuration is to be updated.

- `config` Object

  An object with configuration property/value pairs, specifying the configuration properties to modify.

### `on`

(

- `type`
- `fn`
- `[context]`
- `[arg*]`

)
EventHandle

Inherited from EventTarget: `event-custom/js/event-target.js:188`

Subscribe a callback function to a custom event fired by this object or from an object that bubbles its events to this object.

Callback functions for events published with `emitFacade = true` will receive an `EventFacade` as the first argument (typically named "e"). These callbacks can then call `e.preventDefault()` to disable the behavior published to that event's `defaultFn`. See the `EventFacade` API for all available properties and methods. Subscribers to non-`emitFacade` events will receive the arguments passed to `fire()` after the event name.

To subscribe to multiple events at once, pass an object as the first argument, where the key:value pairs correspond to the eventName:callback, or pass an array of event names as the first argument to subscribe to all listed events with the same callback.

Returning `false` from a callback is supported as an alternative to calling `e.preventDefault(); e.stopPropagation();`. However, it is recommended to use the event methods whenever possible.

#### Parameters:

- `type` String

  The name of the event

- `fn` Function

  The callback to execute in response to the event

- `[context]` Object optional

  Override `this` object in callback

- `[arg*]` Any optional

  0..n additional arguments to supply to the subscriber

#### Returns:

EventHandle: A subscription handle capable of detaching that subscription

### `once`

(

- `type`
- `fn`
- `[context]`
- `[arg*]`

)
EventHandle

Inherited from EventTarget: `event-custom/js/event-target.js:124`

Listen to a custom event hosted by this object one time. This is the equivalent to `on` except the listener is immediatelly detached when it is executed.

#### Parameters:

- `type` String

  The name of the event

- `fn` Function

  The callback to execute in response to the event

- `[context]` Object optional

  Override `this` object in callback

- `[arg*]` Any optional

  0..n additional arguments to supply to the subscriber

#### Returns:

EventHandle: A subscription handle capable of detaching the subscription

### `onceAfter`

(

- `type`
- `fn`
- `[context]`
- `[arg*]`

)
EventHandle

Inherited from EventTarget: `event-custom/js/event-target.js:146`

Listen to a custom event hosted by this object one time. This is the equivalent to `after` except the listener is immediatelly detached when it is executed.

#### Parameters:

- `type` String

  The name of the event

- `fn` Function

  The callback to execute in response to the event

- `[context]` Object optional

  Override `this` object in callback

- `[arg*]` Any optional

  0..n additional arguments to supply to the subscriber

#### Returns:

EventHandle: A subscription handle capable of detaching that subscription

### `parse`

(

- `response`

)
Object[]

Inherited from ModelList: `app/js/model-list.js:638`

Called to parse the response when the list is loaded from the server. This method receives a server response and is expected to return an array of model attribute hashes.

The default implementation assumes that response is either an array of attribute hashes or a JSON string that can be parsed into an array of attribute hashes. If response is a JSON string and either `Y.JSON` or the native `JSON` object are available, it will be parsed automatically. If a parse error occurs, an `error` event will be fired and the model will not be updated.

You may override this method to implement custom parsing logic if necessary.

#### Parameters:

- `response` Any

  Server response.

#### Returns:

Object[]: Array of model attribute hashes.

### `parseType`

(

- `type`
- `[pre=this._yuievt.config.prefix]`

)
Array

Inherited from EventTarget: `event-custom/js/event-target.js:168`

Available since 3.3.0

Takes the type parameter passed to 'on' and parses out the various pieces that could be included in the type. If the event type is passed without a prefix, it will be expanded to include the prefix one is supplied or the event target is configured with a default prefix.

#### Parameters:

- `type` String

  the type

- `[pre=this._yuievt.config.prefix]` String optional

  the prefix

#### Returns:

Array: an array containing: * the detach category, if supplied, * the prefixed event type, * whether or not this is an after listener, * the supplied event type

### `publish`

(

- `type`
- `opts`

)
CustomEvent

Inherited from EventTarget: `event-custom/js/event-target.js:493`

Creates a new custom event of the specified type. If a custom event by that name already exists, it will not be re-created. In either case the custom event is returned.

#### Parameters:

- `type` String

  the type, or name of the event

- `opts` Object

  optional config params. Valid properties are:

  - 'broadcast': whether or not the YUI instance and YUI global are notified when the event is fired (false)
  - 'bubbles': whether or not this event bubbles (true) Events can only bubble if emitFacade is true.
  - 'context': the default execution context for the listeners (this)
  - 'defaultFn': the default function to execute when this event fires if preventDefault was not called
  - 'emitFacade': whether or not this event emits a facade (false)
  - 'prefix': the prefix for this targets events, e.g., 'menu' in 'menu:click'
  - 'fireOnce': if an event is configured to fire once, new subscribers after the fire will be notified immediately.
  - 'async': fireOnce event listeners will fire synchronously if the event has already fired unless async is true.
  - 'preventable': whether or not preventDefault() has an effect (true)
  - 'preventedFn': a function that is executed when preventDefault is called
  - 'queuable': whether or not this event can be queued during bubbling (false)
  - 'silent': if silent is true, debug messages are not provided for this event.
  - 'stoppedFn': a function that is executed when stopPropagation is called

  - 'monitored': specifies whether or not this event should send notifications about when the event has been attached, detached, or published.
  - 'type': the event type (valid option if not provided as the first parameter to publish)

#### Returns:

CustomEvent: the custom event

### `remove`

(

- `models`
- `[options]`

)
Model | Model[]

Inherited from ArrayList but overwritten in `app/js/model-list.js:674`

Removes the specified model or array of models from this list. You may also pass another ModelList instance to remove all the models that are in both that instance and this instance, or pass numerical indices to remove the models at those indices.

#### Parameters:

- `models` Model | Model[] | ModelList | Number | Number[]

  Models or indices of models to remove.

- `[options]` Object optional

  Data to be mixed into the event facade of the `remove` event(s) for the removed models.

  - `[silent=false]` Boolean optional

    If `true`, no `remove` event(s) will be fired.

#### Returns:

Model | Model[]: Removed model or array of removed models.

### `removeAttr`

(

- `name`

)

Inherited from AttributeExtras: `attribute/js/AttributeExtras.js:79`

Removes an attribute from the host object

#### Parameters:

- `name` String

  The name of the attribute to be removed.

### `removeTarget`

(

- `o`

)

Inherited from EventTarget: `event-custom/js/event-facade.js:489`

Removes a bubble target

#### Parameters:

- `o` EventTarget

  the target to remove

### `reset`

(

- `[models]`
- `[options]`

)
chainable

Inherited from AttributeExtras but overwritten in `app/js/lazy-model-list.js:187`

Overrides ModelList#reset() to work with plain objects.

#### Parameters:

- `[models]` Object[] | Model[] | ModelList optional

  Models to add.

- `[options]` Object optional

  Options.

### `revive`

(

- `[item]`

)
Model | Model[] | Null

Defined in `app/js/lazy-model-list.js:223`

Revives an item (or all items) into a full Model instance. The item argument may be the index of an object in this list, an actual object (which must exist in the list), or may be omitted to revive all items in the list.

Once revived, Model instances are attached to this list and cached so that reviving them in the future doesn't require another Model instantiation. Use the `free()` method to explicitly uncache and detach a previously revived Model instance.

Note: Specifying an index rather than an object will be faster, since objects require an `indexOf()` lookup in order to retrieve the index.

#### Parameters:

- `[item]` Number | Object optional

  Index of the object to revive, or the object itself. If an object, that object must exist in this list. If not specified, all items in the list will be revived and an array of models will be returned.

#### Returns:

Model | Model[] | Null: Revived Model instance, array of revived Model instances, or `null` if the given index or object was not found in this list.

### `set`

(

- `name`
- `value`
- `[opts]`

)
Object chainable

Inherited from AttributeObservable but overwritten in `attribute/js/AttributeCore.js:410`

Sets the value of an attribute.

#### Parameters:

- `name` String

  The name of the attribute. If the current value of the attribute is an Object, dot notation can be used to set the value of a property within the object (e.g. `set("x.y.z", 5)`).

- `value` Any

  The value to set the attribute to.

- `[opts]` Object optional

  Optional data providing the circumstances for the change.

#### Returns:

Object: A reference to the host object.

### `setAttrs`

(

- `attrs`
- `[opts]`

)
Object chainable

Inherited from AttributeObservable but overwritten in `attribute/js/AttributeCore.js:729`

Sets multiple attribute values.

#### Parameters:

- `attrs` Object

  An object with attributes name/value pairs.

- `[opts]` Object optional

  Optional data providing the circumstances for the change.

#### Returns:

Object: A reference to the host object.

### `size`

() Integer

Inherited from ArrayList: `collection/js/arraylist.js:106`

How many items are in this list?

#### Returns:

Integer: Number of items in the list

### `some`

(

- `callback`
- `[thisObj]`

)
Boolean

Inherited from ArrayList but overwritten in `app/js/model-list.js:766`

Available since 3.6.0

Executes the supplied function on each model in this list, and stops iterating if the callback returns `true`.

By default, the callback function's `this` object will refer to the model currently being iterated. Specify a `thisObj` to override the `this` object if desired.

Note: Iteration is performed on a copy of the internal array of models, so it's safe to delete a model from the list during iteration.

#### Parameters:

- `callback` Function

  Function to execute on each model.

  - `model` Model

    Model instance.

  - `index` Number

    Index of the current model.

  - `list` ModelList

    The ModelList being iterated.

- `[thisObj]` Object optional

  Object to use as the `this` object when executing the callback.

#### Returns:

Boolean: `true` if the callback returned `true` for any item, `false` otherwise.

### `sort`

(

- `[options]`

)
chainable

Inherited from ModelList: `app/js/model-list.js:803`

Forcibly re-sorts the list.

Usually it shouldn't be necessary to call this method since the list maintains its sort order when items are added and removed, but if you change the `comparator` function after items are already in the list, you'll need to re-sort.

#### Parameters:

- `[options]` Object optional

  Data to be mixed into the event facade of the `reset` event.

  - `[silent=false]` Boolean optional

    If `true`, no `reset` event will be fired.

### `subscribe`

() deprecated

Inherited from EventTarget: `event-custom/js/event-target.js:336`

Deprecated: use on

subscribe to an event

### `sync`

(

- `action`
- `[options]`
- `[callback]`

)

Inherited from ModelList: `app/js/model-list.js:841`

Override this method to provide a custom persistence implementation for this list. The default method just calls the callback without actually doing anything.

This method is called internally by `load()` and its implementations relies on the callback being called. This effectively means that when a callback is provided, it must be called at some point for the class to operate correctly.

#### Parameters:

- `action` String

  Sync action to perform. May be one of the following:

  - `create`: Store a list of newly-created models for the first time.
  - `delete`: Delete a list of existing models.
  - `read` : Load a list of existing models.

  - `update`: Update a list of existing models.

    Currently, model lists only make use of the `read` action, but other actions may be used in future versions.

- `[options]` Object optional

  Sync options. It's up to the custom sync implementation to determine what options it supports or requires, if any.

- `[callback]` Function optional

  Called when the sync operation finishes.

  - `err` Error

    If an error occurred, this parameter will contain the error. If the sync operation succeeded, err will be falsy.

  - `[response]` Any optional

    The server's response. This value will be passed to the `parse()` method, which is expected to parse it and return an array of model attribute hashes.

### `toArray`

() Array

Inherited from ModelList: `app/js/model-list.js:879`

Returns an array containing the models in this list.

#### Returns:

Array: Array containing the models in this list.

### `toJSON`

() Object[]

Inherited from ArrayList but overwritten in `app/js/lazy-model-list.js:263`

Overrides ModelList#toJSON() to use toArray() instead, since it's more efficient for LazyModelList.

#### Returns:

Object[]: Array of objects.

### `toString`

() String

Inherited from BaseCore: `base/js/BaseCore.js:754`

Default toString implementation. Provides the constructor NAME and the instance guid, if set.

#### Returns:

String: String representation for this object

### `unsubscribe`

() deprecated

Inherited from EventTarget: `event-custom/js/event-target.js:459`

Deprecated: use detach

detach a listener

### `unsubscribeAll`

(

- `type`

)
deprecated

Inherited from EventTarget: `event-custom/js/event-target.js:480`

Deprecated: use detachAll

Removes all listeners from the specified event. If the event type is not specified, all listeners from all hosted custom events will be removed.

#### Parameters:

- `type` String

  The type, or name of the event

## Properties

### `_allowAdHocAttrs`

Boolean protected

Inherited from BaseCore: `base/js/BaseCore.js:100`

This property controls whether or not instances of this class should allow users to add ad-hoc attributes through the constructor configuration hash.

AdHoc attributes are attributes which are not defined by the class, and are not handled by the MyClass.NONATTRS_CFG

Default: undefined (false)

### `_isYUIModelList`

Boolean protected

Inherited from ModelList: `app/js/model-list.js:161`

Available since 3.5.0

Total hack to allow us to identify ModelList instances without using `instanceof`, which won't work when the instance was created in another window or YUI sandbox.

Default: true

### `model`

Model | String

Inherited from ModelList: `app/js/model-list.js:142`

The `Model` class or subclass of the models in this list.

The class specified here will be used to create model instances automatically based on attribute hashes passed to the `add()`, `create()`, and `reset()` methods.

You may specify the class as an actual class reference or as a string that resolves to a class reference at runtime (the latter can be useful if the specified class will be loaded lazily).

Default: Y.Model

### `name`

String deprecated

Inherited from BaseCore: `base/js/BaseCore.js:242`

Deprecated: Use this.constructor.NAME

The string used to identify the class of this object.

## Attributes

### `destroyed`

Boolean readonly

Inherited from BaseCore: `base/js/BaseCore.js:157`

Flag indicating whether or not this object has been through the destroy lifecycle phase.

Default: false

#### Fires event `destroyedChange`

Fires when the value for the configuration attribute `destroyed` is changed. You can listen for the event using the `on` method if you wish to be notified before the attribute's value has changed, or using the `after` method if you wish to be notified after the attribute's value has changed.

#### Parameters:

- `e` EventFacade
  An Event Facade object with the following attribute-specific properties added:
  - `prevVal` Any
    The value of the attribute, prior to it being set.
  - `newVal` Any
    The value the attribute is to be set to.
  - `attrName` String
    The name of the attribute being set.
  - `subAttrName` String
    If setting a property within the attribute's value, the name of the sub-attribute property being set.

### `initialized`

Boolean readonly

Inherited from BaseCore: `base/js/BaseCore.js:143`

Flag indicating whether or not this object has been through the init lifecycle phase.

Default: false

#### Fires event `initializedChange`

Fires when the value for the configuration attribute `initialized` is changed. You can listen for the event using the `on` method if you wish to be notified before the attribute's value has changed, or using the `after` method if you wish to be notified after the attribute's value has changed.

#### Parameters:

- `e` EventFacade
  An Event Facade object with the following attribute-specific properties added:
  - `prevVal` Any
    The value of the attribute, prior to it being set.
  - `newVal` Any
    The value the attribute is to be set to.
  - `attrName` String
    The name of the attribute being set.
  - `subAttrName` String
    If setting a property within the attribute's value, the name of the sub-attribute property being set.

## Events

### `add`

Inherited from ModelList: `app/js/model-list.js:37`

Fired when a model is added to the list.

Listen to the `on` phase of this event to be notified before a model is added to the list. Calling `e.preventDefault()` during the `on` phase will prevent the model from being added.

Listen to the `after` phase of this event to be notified after a model has been added to the list.

#### Event Payload:

- `model` Model

  The model being added.

- `index` Number

  The index at which the model will be added.

### `create`

Inherited from ModelList: `app/js/model-list.js:54`

Available since 3.5.0

Fired when a model is created or updated via the `create()` method, but before the model is actually saved or added to the list. The `add` event will be fired after the model has been saved and added to the list.

#### Event Payload:

- `model` Model

  The model being created/updated.

### `destroy`

Inherited from BaseObservable: `base/js/BaseObservable.js:151`

Lifecycle event for the destroy phase, fired prior to destruction. Invoking the preventDefault method on the event object provided to subscribers will prevent destruction from proceeding.

Subscribers to the "after" moment of this event, will be notified after destruction is complete (and as a result cannot prevent destruction).

#### Event Payload:

- `e` EventFacade

  Event object

### `error`

Inherited from ModelList: `app/js/model-list.js:65`

Fired when an error occurs, such as when an attempt is made to add a duplicate model to the list, or when a sync layer response can't be parsed.

#### Event Payload:

- `error` Any

  Error message, object, or exception generated by the error. Calling `toString()` on this should result in a meaningful error message.

- `src` String

  Source of the error. May be one of the following (or any custom error source defined by a ModelList subclass):

  - `add`: Error while adding a model (probably because it's already in the list and can't be added again). The model in question will be provided as the `model` property on the event facade.
  - `parse`: An error parsing a JSON response. The response in question will be provided as the `response` property on the event facade.
  - `remove`: Error while removing a model (probably because it isn't in the list and can't be removed). The model in question will be provided as the `model` property on the event facade.

### `init`

Inherited from BaseObservable: `base/js/BaseObservable.js:62`

Lifecycle event for the init phase, fired prior to initialization. Invoking the preventDefault() method on the event object provided to subscribers will prevent initialization from occuring.

Subscribers to the "after" momemt of this event, will be notified after initialization of the object is complete (and therefore cannot prevent initialization).

#### Event Payload:

- `e` EventFacade

  Event object, with a cfg property which refers to the configuration object passed to the constructor.

### `load`

Inherited from ModelList: `app/js/model-list.js:87`

Available since 3.5.0

Fired after models are loaded from a sync layer.

#### Event Payload:

- `parsed` Object

  The parsed version of the sync layer's response to the load request.

- `response` Mixed

  The sync layer's raw, unparsed response to the load request.

### `remove`

Inherited from ModelList: `app/js/model-list.js:99`

Fired when a model is removed from the list.

Listen to the `on` phase of this event to be notified before a model is removed from the list. Calling `e.preventDefault()` during the `on` phase will prevent the model from being removed.

Listen to the `after` phase of this event to be notified after a model has been removed from the list.

#### Event Payload:

- `model` Model

  The model being removed.

- `index` Number

  The index of the model being removed.

### `reset`

Inherited from ModelList: `app/js/model-list.js:116`

Fired when the list is completely reset via the `reset()` method or sorted via the `sort()` method.

Listen to the `on` phase of this event to be notified before the list is reset. Calling `e.preventDefault()` during the `on` phase will prevent the list from being reset.

Listen to the `after` phase of this event to be notified after the list has been reset.

#### Event Payload:

- `models` Model[]

  Array of the list's new models after the reset.

- `src` String

  Source of the event. May be either `'reset'` or `'sort'`.