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<title>API: attribute Attribute (YUI Library)</title>
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<h1><a href="http://developer.yahoo.com/yui/" title="Yahoo! UI Library">Yahoo! UI Library</a></h1>
<h3>attribute <span class="subtitle">3.0.0</span></h3>
<a href="./index.html" title="Yahoo! UI Library">Yahoo! UI Library</a>
> <a href="./module_attribute.html" title="attribute">attribute</a>
> Attribute
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<h2>
Class <b property="yui:name">Attribute</b>
<span class="extends">
</span>
<span class="extends" rel="yui:extends">
- uses
<span rel="extend" resource="EventTarget.html">
<a href="EventTarget.html" property="yui:name" title="EventTarget">EventTarget</a>
</span>
</span>
</h2>
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<div class="summary description" property="yui:description">
<p>
Attribute provides configurable attribute support along with attribute change events. It is designed to be
augmented on to a host class, and provides the host with the ability to configure attributes to store and retrieve state,
along with attribute change events.
</p>
<p>For example, attributes added to the host can be configured:</p>
<ul>
<li>As read only.</li>
<li>As write once.</li>
<li>With a setter function, which can be used to manipulate
values passed to Attribute's <a href="#method_set">set</a> method, before they are stored.</li>
<li>With a getter function, which can be used to manipulate stored values,
before they are returned by Attribute's <a href="#method_get">get</a> method.</li>
<li>With a validator function, to validate values before they are stored.</li>
</ul>
<p>See the <a href="#method_addAttr">addAttr</a> method, for the complete set of configuration
options available for attributes</p>.
<p><strong>NOTE:</strong> Most implementations will be better off extending the <a href="Base.html">Base</a> class,
instead of augmenting Attribute directly. Base augments Attribute and will handle the initial configuration
of attributes for derived classes, accounting for values passed into the constructor.</p>
</div>
<div rel="yui:properties" resource="#properties">
<div class="section field details">
<h3 id="properties">Properties</h3>
<div class="content">
<div class="protected" rel="yui:property" resource="#property_Attribute._ATTR_CFG">
<h4><a name="property_Attribute._ATTR_CFG" property="yui:name">Attribute._ATTR_CFG</a>
- <code>protected static <span property="yui:type">Array</span></code>
</h4>
<div class="detail">
<div class="description" property="yui:description">
The list of properties which can be configured for
each attribute (e.g. setter, getter, writeOnce etc.).
This property is used internally as a whitelist for faster
Y.mix operations.
</div>
</div>
<hr />
</div>
<div class="" rel="yui:property" resource="#property_Attribute.INVALID_VALUE">
<h4><a name="property_Attribute.INVALID_VALUE" property="yui:name">Attribute.INVALID_VALUE</a>
- <code>static final <span property="yui:type">Object</span></code>
</h4>
<div class="detail">
<div class="description" property="yui:description">
<p>The value to return from an attribute setter in order to prevent the set from going through.</p>
<p>You can return this value from your setter if you wish to combine validator and setter
functionality into a single setter function, which either returns the massaged value to be stored or
Attribute.INVALID_VALUE to prevent invalid values from being stored.</p>
</div>
</div>
<hr />
</div>
</div>
</div>
</div>
<div rel="yui:methods" resource="#methods">
<div class="section method details">
<h3 id="methods">Methods</h3>
<div class="content">
<div class="private" rel="yui:method" resource="#method__addAttrs">
<h4>
<a name="method__addAttrs">_addAttrs</a></h4>
<div class="detail" >
<code>
private
void
<strong property="yui:name">_addAttrs</strong>
(
cfgs
,
values
,
lazy
)
</code>
<div class="description" property="yui:description">
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).
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">cfgs</span>
<<span property="yui:type">Object</span>>
</code>
<span property="yui:description"> An object with attribute name/configuration pairs.</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">values</span>
<<span property="yui:type">Object</span>>
</code>
<span property="yui:description"> 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.</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">lazy</span>
<<span property="yui:type">boolean</span>>
</code>
<span property="yui:description"> 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 <a href="#method_addAttr">addAttr</a>.</span>
</dd>
</dl>
</div>
</div>
<hr />
</div>
<div class="private" rel="yui:method" resource="#method__addLazyAttr">
<h4>
<a name="method__addLazyAttr">_addLazyAttr</a></h4>
<div class="detail" >
<code>
private
void
<strong property="yui:name">_addLazyAttr</strong>
(
name
)
</code>
<div class="description" property="yui:description">
Finishes initializing an attribute which has been lazily added.
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">name</span>
<<span property="yui:type">Object</span>>
</code>
<span property="yui:description"> The name of the attribute</span>
</dd>
</dl>
</div>
</div>
<hr />
</div>
<div class="private" rel="yui:method" resource="#method__defAttrChangeFn">
<h4>
<a name="method__defAttrChangeFn">_defAttrChangeFn</a></h4>
<div class="detail" >
<code>
private
void
<strong property="yui:name">_defAttrChangeFn</strong>
(
e
)
</code>
<div class="description" property="yui:description">
Default function for attribute change events.
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">e</span>
<<span property="yui:type">EventFacade</span>>
</code>
<span property="yui:description"> The event object for attribute change events.</span>
</dd>
</dl>
</div>
</div>
<hr />
</div>
<div class="private" rel="yui:method" resource="#method__fireAttrChange">
<h4>
<a name="method__fireAttrChange">_fireAttrChange</a></h4>
<div class="detail" >
<code>
private
void
<strong property="yui:name">_fireAttrChange</strong>
(
attrName
,
subAttrName
,
currVal
,
newVal
,
opts
)
</code>
<div class="description" property="yui:description">
Utility method to help setup the event payload and fire the attribute change event.
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">attrName</span>
<<span property="yui:type">String</span>>
</code>
<span property="yui:description"> The name of the attribute</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">subAttrName</span>
<<span property="yui:type">String</span>>
</code>
<span property="yui:description"> The full path of the property being changed,
if this is a sub-attribute value being change. Otherwise null.</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">currVal</span>
<<span property="yui:type">Any</span>>
</code>
<span property="yui:description"> The current value of the attribute</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">newVal</span>
<<span property="yui:type">Any</span>>
</code>
<span property="yui:description"> The new value of the attribute</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">opts</span>
<<span property="yui:type">Object</span>>
</code>
<span property="yui:description"> Any additional event data to mix into the attribute change event's event facade.</span>
</dd>
</dl>
</div>
</div>
<hr />
</div>
<div class="protected" rel="yui:method" resource="#method__getAttr">
<h4>
<a name="method__getAttr">_getAttr</a></h4>
<div class="detail" >
<code>
protected
Any
<strong property="yui:name">_getAttr</strong>
(
name
)
</code>
<div class="description" property="yui:description">
Provides the common implementation for the public get method,
allowing Attribute hosts to over-ride either method.
See <a href="#method_get">get</a> for argument details.
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">name</span>
<<span property="yui:type">String</span>>
</code>
<span property="yui:description"> The name of the attribute.</span>
</dd>
</dl>
<dl>
<dt>Returns:
<code property="yui:return">
Any
</code></dt>
<dd property="yui:returnInfo">The value of the attribute.</dd>
</dl>
<div class="chainable">
<strong>Chainable:</strong> This method is chainable.
</div>
</div>
</div>
<hr />
</div>
<div class="private" rel="yui:method" resource="#method__getAttrInitVal">
<h4>
<a name="method__getAttrInitVal">_getAttrInitVal</a></h4>
<div class="detail" >
<code>
private
Any
<strong property="yui:name">_getAttrInitVal</strong>
(
attr
,
cfg
,
initValues
)
</code>
<div class="description" property="yui:description">
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.
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">attr</span>
<<span property="yui:type">String</span>>
</code>
<span property="yui:description"> The name of the attribute</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">cfg</span>
<<span property="yui:type">Object</span>>
</code>
<span property="yui:description"> The attribute configuration object</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">initValues</span>
<<span property="yui:type">Object</span>>
</code>
<span property="yui:description"> The object with simple and complex attribute name/value pairs returned from _normAttrVals</span>
</dd>
</dl>
<dl>
<dt>Returns:
<code property="yui:return">
Any
</code></dt>
<dd property="yui:returnInfo">The initial value of the attribute.</dd>
</dl>
</div>
</div>
<hr />
</div>
<div class="protected" rel="yui:method" resource="#method__getAttrs">
<h4>
<a name="method__getAttrs">_getAttrs</a></h4>
<div class="detail" >
<code>
protected
Object
<strong property="yui:name">_getAttrs</strong>
(
attrs
)
</code>
<div class="description" property="yui:description">
Implementation behind the public getAttrs method, to get multiple attribute values.
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">attrs</span>
<<span property="yui:type">Array | boolean</span>>
</code>
<span property="yui:description"> 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.</span>
</dd>
</dl>
<dl>
<dt>Returns:
<code property="yui:return">
Object
</code></dt>
<dd property="yui:returnInfo">An object with attribute name/value pairs.</dd>
</dl>
</div>
</div>
<hr />
</div>
<div class="private" rel="yui:method" resource="#method__getStateVal">
<h4>
<a name="method__getStateVal">_getStateVal</a></h4>
<div class="detail" >
<code>
private
Any
<strong property="yui:name">_getStateVal</strong>
(
name
)
</code>
<div class="description" property="yui:description">
Gets the stored value for the attribute, from either the
internal state object, or the state proxy if it exits
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">name</span>
<<span property="yui:type">String</span>>
</code>
<span property="yui:description"> The name of the attribute</span>
</dd>
</dl>
<dl>
<dt>Returns:
<code property="yui:return">
Any
</code></dt>
<dd property="yui:returnInfo">The stored value of the attribute</dd>
</dl>
</div>
</div>
<hr />
</div>
<div class="private" rel="yui:method" resource="#method__isLazyAttr">
<h4>
<a name="method__isLazyAttr">_isLazyAttr</a></h4>
<div class="detail" >
<code>
private
boolean
<strong property="yui:name">_isLazyAttr</strong>
(
name
)
</code>
<div class="description" property="yui:description">
Checks whether or not the attribute is one which has been
added lazily and still requires initialization.
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">name</span>
<<span property="yui:type">String</span>>
</code>
<span property="yui:description"> The name of the attribute</span>
</dd>
</dl>
<dl>
<dt>Returns:
<code property="yui:return">
boolean
</code></dt>
<dd property="yui:returnInfo">true if it's a lazily added attribute, false otherwise.</dd>
</dl>
</div>
</div>
<hr />
</div>
<div class="private" rel="yui:method" resource="#method__normAttrVals">
<h4>
<a name="method__normAttrVals">_normAttrVals</a></h4>
<div class="detail" >
<code>
private
Object
<strong property="yui:name">_normAttrVals</strong>
(
valueHash
)
</code>
<div class="description" property="yui:description">
Utility method to split out simple attribute name/value pairs ("x")
from complex attribute name/value pairs ("x.y.z"), so that complex
attributes can be keyed by the top level attribute name.
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">valueHash</span>
<<span property="yui:type">Object</span>>
</code>
<span property="yui:description"> An object with attribute name/value pairs</span>
</dd>
</dl>
<dl>
<dt>Returns:
<code property="yui:return">
Object
</code></dt>
<dd property="yui:returnInfo">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.</dd>
</dl>
</div>
</div>
<hr />
</div>
<div class="protected" rel="yui:method" resource="#method__protectAttrs">
<h4>
<a name="method__protectAttrs">_protectAttrs</a></h4>
<div class="detail" >
<code>
protected
Object
<strong property="yui:name">_protectAttrs</strong>
(
attrs
)
</code>
<div class="description" property="yui:description">
Utility method to protect an attribute configuration
hash, by merging the entire object and the individual
attr config objects.
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">attrs</span>
<<span property="yui:type">Object</span>>
</code>
<span property="yui:description"> A hash of attribute to configuration object pairs.</span>
</dd>
</dl>
<dl>
<dt>Returns:
<code property="yui:return">
Object
</code></dt>
<dd property="yui:returnInfo">A protected version of the attrs argument.</dd>
</dl>
</div>
</div>
<hr />
</div>
<div class="protected" rel="yui:method" resource="#method__set">
<h4>
<a name="method__set">_set</a></h4>
<div class="detail" >
<code>
protected
Object
<strong property="yui:name">_set</strong>
(
name
,
val
,
opts
)
</code>
<div class="description" property="yui:description">
Allows setting of readOnly/writeOnce attributes. See <a href="#method_set">set</a> for argument details.
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">name</span>
<<span property="yui:type">String</span>>
</code>
<span property="yui:description"> The name of the attribute.</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">val</span>
<<span property="yui:type">Any</span>>
</code>
<span property="yui:description"> The value to set the attribute to.</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">opts</span>
<<span property="yui:type">Object</span>>
</code>
<span property="yui:description"> (Optional) Optional event data to be mixed into
the event facade passed to subscribers of the attribute's change event.</span>
</dd>
</dl>
<dl>
<dt>Returns:
<code property="yui:return">
Object
</code></dt>
<dd property="yui:returnInfo">A reference to the host object.</dd>
</dl>
<div class="chainable">
<strong>Chainable:</strong> This method is chainable.
</div>
</div>
</div>
<hr />
</div>
<div class="protected" rel="yui:method" resource="#method__setAttr">
<h4>
<a name="method__setAttr">_setAttr</a></h4>
<div class="detail" >
<code>
protected
Object
<strong property="yui:name">_setAttr</strong>
(
name
,
value
,
opts
,
force
)
</code>
<div class="description" property="yui:description">
Provides the common implementation for the public set and protected _set methods.
See <a href="#method_set">set</a> for argument details.
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">name</span>
<<span property="yui:type">String</span>>
</code>
<span property="yui:description"> The name of the attribute.</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">value</span>
<<span property="yui:type">Any</span>>
</code>
<span property="yui:description"> The value to set the attribute to.</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">opts</span>
<<span property="yui:type">Object</span>>
</code>
<span property="yui:description"> (Optional) Optional event data to be mixed into
the event facade passed to subscribers of the attribute's change event.</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">force</span>
<<span property="yui:type">boolean</span>>
</code>
<span property="yui:description"> If true, allows the caller to set values for
readOnly or writeOnce attributes which have already been set.</span>
</dd>
</dl>
<dl>
<dt>Returns:
<code property="yui:return">
Object
</code></dt>
<dd property="yui:returnInfo">A reference to the host object.</dd>
</dl>
<div class="chainable">
<strong>Chainable:</strong> This method is chainable.
</div>
</div>
</div>
<hr />
</div>
<div class="protected" rel="yui:method" resource="#method__setAttrs">
<h4>
<a name="method__setAttrs">_setAttrs</a></h4>
<div class="detail" >
<code>
protected
Object
<strong property="yui:name">_setAttrs</strong>
(
attrs
)
</code>
<div class="description" property="yui:description">
Implementation behind the public setAttrs method, to set multiple attribute values.
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">attrs</span>
<<span property="yui:type">Object</span>>
</code>
<span property="yui:description"> An object with attributes name/value pairs.</span>
</dd>
</dl>
<dl>
<dt>Returns:
<code property="yui:return">
Object
</code></dt>
<dd property="yui:returnInfo">A reference to the host object.</dd>
</dl>
<div class="chainable">
<strong>Chainable:</strong> This method is chainable.
</div>
</div>
</div>
<hr />
</div>
<div class="private" rel="yui:method" resource="#method__setAttrVal">
<h4>
<a name="method__setAttrVal">_setAttrVal</a></h4>
<div class="detail" >
<code>
private
booolean
<strong property="yui:name">_setAttrVal</strong>
(
attrName
,
subAttrName
,
prevVal
,
newVal
)
</code>
<div class="description" property="yui:description">
Updates the stored value of the attribute in the privately held State object,
if validation and setter passes.
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">attrName</span>
<<span property="yui:type">String</span>>
</code>
<span property="yui:description"> The attribute name.</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">subAttrName</span>
<<span property="yui:type">String</span>>
</code>
<span property="yui:description"> The sub-attribute name, if setting a sub-attribute property ("x.y.z").</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">prevVal</span>
<<span property="yui:type">Any</span>>
</code>
<span property="yui:description"> The currently stored value of the attribute.</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">newVal</span>
<<span property="yui:type">Any</span>>
</code>
<span property="yui:description"> The value which is going to be stored.</span>
</dd>
</dl>
<dl>
<dt>Returns:
<code property="yui:return">
booolean
</code></dt>
<dd property="yui:returnInfo">true if the new attribute value was stored, false if not.</dd>
</dl>
</div>
</div>
<hr />
</div>
<div class="private" rel="yui:method" resource="#method__setStateVal">
<h4>
<a name="method__setStateVal">_setStateVal</a></h4>
<div class="detail" >
<code>
private
void
<strong property="yui:name">_setStateVal</strong>
(
name
,
value
)
</code>
<div class="description" property="yui:description">
Sets the stored value for the attribute, in either the
internal state object, or the state proxy if it exits
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">name</span>
<<span property="yui:type">String</span>>
</code>
<span property="yui:description"> The name of the attribute</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">value</span>
<<span property="yui:type">Any</span>>
</code>
<span property="yui:description"> The value of the attribute</span>
</dd>
</dl>
</div>
</div>
<hr />
</div>
<div class="" rel="yui:method" resource="#method_addAttr">
<h4>
<a name="method_addAttr">addAttr</a></h4>
<div class="detail" >
<code>
Object
<strong property="yui:name">addAttr</strong>
(
name
,
config
,
lazy
)
</code>
<div class="description" property="yui:description">
<p>
Adds an attribute with the provided configuration to the host object.
</p>
<p>
The config argument object supports the following properties:
</p>
<dl>
<dt>value <Any></dt>
<dd>The initial value to set on the attribute</dd>
<dt>valueFn <Function></dt>
<dd>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 defined, this precedence over the value property.</dd>
<dt>readOnly <boolean></dt>
<dd>Whether or not the attribute is read only. Attributes having readOnly set to true
cannot be modified by invoking the set method.</dd>
<dt>writeOnce <boolean></dt>
<dd>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.</dd>
<dt>setter <Function></dt>
<dd>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
<a href="#property_Attribute.INVALID_VALUE">Attribute.INVALID_VALUE</a>, from the setter will prevent
the value from being stored.</dd>
<dt>getter <Function></dt>
<dd>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.</dd>
<dt>validator <Function></dt>
<dd>The validator function invoked prior to setting the stored value. Returning
false from the validator function will prevent the value from being stored.</dd>
<dt>broadcast <int></dt>
<dd>If and how attribute change events for this attribute should be broadcast. See CustomEvent's <a href="CustomEvent.html#property_broadcast">broadcast</a> property for
valid values. By default attribute change events are not broadcast.</dd>
<dt>lazyAdd <boolean></dt>
<dd>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 <a href="#method_addAttrs">addAttrs</a> method.</dd>
</dl>
<p>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.</p>
<p>Configuration properties outside of the list mentioned above are considered private properties used internally by attribute, and are not intended for public use.</p>
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">name</span>
<<span property="yui:type">String</span>>
</code>
<span property="yui:description"> The name of the attribute.</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">config</span>
<<span property="yui:type">Object</span>>
</code>
<span property="yui:description"> An object with attribute configuration property/value pairs, specifying the configuration for the attribute.
<p>
<strong>NOTE:</strong> 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.
</p></span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">lazy</span>
<<span property="yui:type">boolean</span>>
</code>
<span property="yui:description"> (optional) Whether or not to add this attribute lazily (on the first call to get/set).</span>
</dd>
</dl>
<dl>
<dt>Returns:
<code property="yui:return">
Object
</code></dt>
<dd property="yui:returnInfo">A reference to the host object.</dd>
</dl>
<div class="chainable">
<strong>Chainable:</strong> This method is chainable.
</div>
</div>
</div>
<hr />
</div>
<div class="" rel="yui:method" resource="#method_addAttrs">
<h4>
<a name="method_addAttrs">addAttrs</a></h4>
<div class="detail" >
<code>
Object
<strong property="yui:name">addAttrs</strong>
(
cfgs
,
values
,
lazy
)
</code>
<div class="description" property="yui:description">
Configures a group of attributes, and sets initial values.
<p>
<strong>NOTE:</strong> This method does not isolate the configuration object by merging/cloning.
The caller is responsible for merging/cloning the configuration object if required.
</p>
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">cfgs</span>
<<span property="yui:type">Object</span>>
</code>
<span property="yui:description"> An object with attribute name/configuration pairs.</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">values</span>
<<span property="yui:type">Object</span>>
</code>
<span property="yui:description"> 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.</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">lazy</span>
<<span property="yui:type">boolean</span>>
</code>
<span property="yui:description"> 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 <a href="#method_addAttr">addAttr</a>.</span>
</dd>
</dl>
<dl>
<dt>Returns:
<code property="yui:return">
Object
</code></dt>
<dd property="yui:returnInfo">A reference to the host object.</dd>
</dl>
<div class="chainable">
<strong>Chainable:</strong> This method is chainable.
</div>
</div>
</div>
<hr />
</div>
<div class="" rel="yui:method" resource="#method_attrAdded">
<h4>
<a name="method_attrAdded">attrAdded</a></h4>
<div class="detail" >
<code>
boolean
<strong property="yui:name">attrAdded</strong>
(
name
)
</code>
<div class="description" property="yui:description">
Checks if the given attribute has been added to the host
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">name</span>
<<span property="yui:type">String</span>>
</code>
<span property="yui:description"> The name of the attribute to check.</span>
</dd>
</dl>
<dl>
<dt>Returns:
<code property="yui:return">
boolean
</code></dt>
<dd property="yui:returnInfo">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.</dd>
</dl>
</div>
</div>
<hr />
</div>
<div class="" rel="yui:method" resource="#method_get">
<h4>
<a name="method_get">get</a></h4>
<div class="detail" >
<code>
Any
<strong property="yui:name">get</strong>
(
name
)
</code>
<div class="description" property="yui:description">
Returns the current value of the attribute. If the attribute
has been configured with a 'getter' function, this method will delegate
to the 'getter' to obtain the value of the attribute.
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">name</span>
<<span property="yui:type">String</span>>
</code>
<span property="yui:description"> The name of the attribute. If the value of the attribute is an Object,
dot notation can be used to obtain the value of a property of the object (e.g. <code>get("x.y.z")</code>)</span>
</dd>
</dl>
<dl>
<dt>Returns:
<code property="yui:return">
Any
</code></dt>
<dd property="yui:returnInfo">The value of the attribute</dd>
</dl>
</div>
</div>
<hr />
</div>
<div class="" rel="yui:method" resource="#method_getAttrs">
<h4>
<a name="method_getAttrs">getAttrs</a></h4>
<div class="detail" >
<code>
Object
<strong property="yui:name">getAttrs</strong>
(
attrs
)
</code>
<div class="description" property="yui:description">
Gets multiple attribute values.
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">attrs</span>
<<span property="yui:type">Array | boolean</span>>
</code>
<span property="yui:description"> 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.</span>
</dd>
</dl>
<dl>
<dt>Returns:
<code property="yui:return">
Object
</code></dt>
<dd property="yui:returnInfo">An object with attribute name/value pairs.</dd>
</dl>
</div>
</div>
<hr />
</div>
<div class="" rel="yui:method" resource="#method_modifyAttr">
<h4>
<a name="method_modifyAttr">modifyAttr</a></h4>
<div class="detail" >
<code>
void
<strong property="yui:name">modifyAttr</strong>
(
name
,
config
)
</code>
<div class="description" property="yui:description">
Updates the configuration of an attribute which has already been added.
<p>
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.
</p>
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">name</span>
<<span property="yui:type">String</span>>
</code>
<span property="yui:description"> The name of the attribute whose configuration is to be updated.</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">config</span>
<<span property="yui:type">Object</span>>
</code>
<span property="yui:description"> An object with configuration property/value pairs, specifying the configuration properties to modify.</span>
</dd>
</dl>
</div>
</div>
<hr />
</div>
<div class="" rel="yui:method" resource="#method_removeAttr">
<h4>
<a name="method_removeAttr">removeAttr</a></h4>
<div class="detail" >
<code>
void
<strong property="yui:name">removeAttr</strong>
(
name
)
</code>
<div class="description" property="yui:description">
Removes an attribute from the host object
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">name</span>
<<span property="yui:type">String</span>>
</code>
<span property="yui:description"> The name of the attribute to be removed.</span>
</dd>
</dl>
</div>
</div>
<hr />
</div>
<div class="" rel="yui:method" resource="#method_reset">
<h4>
<a name="method_reset">reset</a></h4>
<div class="detail" >
<code>
Object
<strong property="yui:name">reset</strong>
(
name
)
</code>
<div class="description" property="yui:description">
Resets the attribute (or all attributes) to its initial value, as long as
the attribute is not readOnly, or writeOnce.
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">name</span>
<<span property="yui:type">String</span>>
</code>
<span property="yui:description"> Optional. The name of the attribute to reset. If omitted, all attributes are reset.</span>
</dd>
</dl>
<dl>
<dt>Returns:
<code property="yui:return">
Object
</code></dt>
<dd property="yui:returnInfo">A reference to the host object.</dd>
</dl>
<div class="chainable">
<strong>Chainable:</strong> This method is chainable.
</div>
</div>
</div>
<hr />
</div>
<div class="" rel="yui:method" resource="#method_set">
<h4>
<a name="method_set">set</a></h4>
<div class="detail" >
<code>
Object
<strong property="yui:name">set</strong>
(
name
,
value
,
opts
)
</code>
<div class="description" property="yui:description">
Sets the value of an attribute.
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">name</span>
<<span property="yui:type">String</span>>
</code>
<span property="yui:description"> 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. <code>set("x.y.z", 5)</code>).</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">value</span>
<<span property="yui:type">Any</span>>
</code>
<span property="yui:description"> The value to set the attribute to.</span>
</dd>
<dd rel="yui:parameter">
<code><span property="yui:name">opts</span>
<<span property="yui:type">Object</span>>
</code>
<span property="yui:description"> (Optional) Optional event data to be mixed into
the event facade passed to subscribers of the attribute's change event. This
can be used as a flexible way to identify the source of a call to set, allowing
the developer to distinguish between set called internally by the host, vs.
set called externally by the application developer.</span>
</dd>
</dl>
<dl>
<dt>Returns:
<code property="yui:return">
Object
</code></dt>
<dd property="yui:returnInfo">A reference to the host object.</dd>
</dl>
<div class="chainable">
<strong>Chainable:</strong> This method is chainable.
</div>
</div>
</div>
<hr />
</div>
<div class="" rel="yui:method" resource="#method_setAttrs">
<h4>
<a name="method_setAttrs">setAttrs</a></h4>
<div class="detail" >
<code>
Object
<strong property="yui:name">setAttrs</strong>
(
attrs
)
</code>
<div class="description" property="yui:description">
Sets multiple attribute values.
</div>
<div class="description">
<dl rel="yui:parameters">
<dt>Parameters:</dt>
<dd rel="yui:parameter">
<code><span property="yui:name">attrs</span>
<<span property="yui:type">Object</span>>
</code>
<span property="yui:description"> An object with attributes name/value pairs.</span>
</dd>
</dl>
<dl>
<dt>Returns:
<code property="yui:return">
Object
</code></dt>
<dd property="yui:returnInfo">A reference to the host object.</dd>
</dl>
<div class="chainable">
<strong>Chainable:</strong> This method is chainable.
</div>
</div>
</div>
<hr />
</div>
</div>
</div>
<div rel="yui:inheritance">
<div class="section field inheritance" rel="yui:superclass" resource="EventTarget.html">
<h4>Methods inherited from <a href="EventTarget.html" property="yui:name" title="EventTarget">EventTarget</a>:</h4>
<div class="content" rel="yui:methods">
<code>
<span rel="yui:method" resource="EventTarget.html#method__getType">
<a class="private" href="EventTarget.html#method__getType" property="yui:name" title="_getType">_getType</a><span class="private">,</span>
</span>
<span rel="yui:method" resource="EventTarget.html#method__parseType">
<a class="private" href="EventTarget.html#method__parseType" property="yui:name" title="_parseType">_parseType</a><span class="private">,</span>
</span>
<span rel="yui:method" resource="EventTarget.html#method_addTarget">
<a class="" href="EventTarget.html#method_addTarget" property="yui:name" title="addTarget">addTarget</a><span class="">,</span>
</span>
<span rel="yui:method" resource="EventTarget.html#method_after">
<a class="" href="EventTarget.html#method_after" property="yui:name" title="after">after</a><span class="">,</span>
</span>
<span rel="yui:method" resource="EventTarget.html#method_before">
<a class=" deprecated" href="EventTarget.html#method_before" property="yui:name" title="before">before</a><span class=" deprecated">,</span>
</span>
<span rel="yui:method" resource="EventTarget.html#method_bubble">
<a class="" href="EventTarget.html#method_bubble" property="yui:name" title="bubble">bubble</a><span class="">,</span>
</span>
<span rel="yui:method" resource="EventTarget.html#method_detach">
<a class="" href="EventTarget.html#method_detach" property="yui:name" title="detach">detach</a><span class="">,</span>
</span>
<span rel="yui:method" resource="EventTarget.html#method_detachAll">
<a class="" href="EventTarget.html#method_detachAll" property="yui:name" title="detachAll">detachAll</a><span class="">,</span>
</span>
<span rel="yui:method" resource="EventTarget.html#method_fire">
<a class="" href="EventTarget.html#method_fire" property="yui:name" title="fire">fire</a><span class="">,</span>
</span>
<span rel="yui:method" resource="EventTarget.html#method_getEvent">
<a class="" href="EventTarget.html#method_getEvent" property="yui:name" title="getEvent">getEvent</a><span class="">,</span>
</span>
<span rel="yui:method" resource="EventTarget.html#method_on">
<a class="" href="EventTarget.html#method_on" property="yui:name" title="on">on</a><span class="">,</span>
</span>
<span rel="yui:method" resource="EventTarget.html#method_publish">
<a class="" href="EventTarget.html#method_publish" property="yui:name" title="publish">publish</a><span class="">,</span>
</span>
<span rel="yui:method" resource="EventTarget.html#method_removeTarget">
<a class="" href="EventTarget.html#method_removeTarget" property="yui:name" title="removeTarget">removeTarget</a><span class="">,</span>
</span>
<span rel="yui:method" resource="EventTarget.html#method_subscribe">
<a class=" deprecated" href="EventTarget.html#method_subscribe" property="yui:name" title="subscribe">subscribe</a><span class=" deprecated">,</span>
</span>
<span rel="yui:method" resource="EventTarget.html#method_unsubscribe">
<a class=" deprecated" href="EventTarget.html#method_unsubscribe" property="yui:name" title="unsubscribe">unsubscribe</a><span class=" deprecated">,</span>
</span>
<span rel="yui:method" resource="EventTarget.html#method_unsubscribeAll">
<a class=" deprecated" href="EventTarget.html#method_unsubscribeAll" property="yui:name" title="unsubscribeAll">unsubscribeAll</a>
</span>
</code>
</div>
</div>
</div>
</div>
<div rel="yui:events" resource="#events">
</div>
<div rel="yui:attributes" resource="#configattributes">
</div>
</div>
</div>
<div class="yui-b">
<div class="nav">
<div id="moduleList" class="module">
<h4>Modules</h4>
<ul class="content">
<li class=""><a href="module_anim.html" title="anim">anim</a></li>
<li class=""><a href="module_async-queue.html" title="async-queue">async-queue</a></li>
<li class="selected"><a href="module_attribute.html" title="attribute">attribute</a></li>
<li class=""><a href="module_base.html" title="base">base</a></li>
<li class=""><a href="module_cache.html" title="cache">cache</a></li>
<li class=""><a href="module_classnamemanager.html" title="classnamemanager">classnamemanager</a></li>
<li class=""><a href="module_collection.html" title="collection">collection</a></li>
<li class=""><a href="module_console.html" title="console">console</a></li>
<li class=""><a href="module_console-filters.html" title="console-filters">console-filters</a></li>
<li class=""><a href="module_cookie.html" title="cookie">cookie</a></li>
<li class=""><a href="module_dataschema.html" title="dataschema">dataschema</a></li>
<li class=""><a href="module_datasource.html" title="datasource">datasource</a></li>
<li class=""><a href="module_datatype.html" title="datatype">datatype</a></li>
<li class=""><a href="module_dd.html" title="dd">dd</a></li>
<li class=""><a href="module_dom.html" title="dom">dom</a></li>
<li class=""><a href="module_dump.html" title="dump">dump</a></li>
<li class=""><a href="module_event.html" title="event">event</a></li>
<li class=""><a href="module_event-custom.html" title="event-custom">event-custom</a></li>
<li class=""><a href="module_event-simulate.html" title="event-simulate">event-simulate</a></li>
<li class=""><a href="module_history.html" title="history">history</a></li>
<li class=""><a href="module_imageloader.html" title="imageloader">imageloader</a></li>
<li class=""><a href="module_io.html" title="io">io</a></li>
<li class=""><a href="module_json.html" title="json">json</a></li>
<li class=""><a href="module_node.html" title="node">node</a></li>
<li class=""><a href="module_node-focusmanager.html" title="node-focusmanager">node-focusmanager</a></li>
<li class=""><a href="module_node-menunav.html" title="node-menunav">node-menunav</a></li>
<li class=""><a href="module_oop.html" title="oop">oop</a></li>
<li class=""><a href="module_overlay.html" title="overlay">overlay</a></li>
<li class=""><a href="module_plugin.html" title="plugin">plugin</a></li>
<li class=""><a href="module_profiler.html" title="profiler">profiler</a></li>
<li class=""><a href="module_queue-promote.html" title="queue-promote">queue-promote</a></li>
<li class=""><a href="module_slider.html" title="slider">slider</a></li>
<li class=""><a href="module_stylesheet.html" title="stylesheet">stylesheet</a></li>
<li class=""><a href="module_substitute.html" title="substitute">substitute</a></li>
<li class=""><a href="module_test.html" title="test">test</a></li>
<li class=""><a href="module_widget.html" title="widget">widget</a></li>
<li class=""><a href="module_widget-position.html" title="widget-position">widget-position</a></li>
<li class=""><a href="module_widget-position-ext.html" title="widget-position-ext">widget-position-ext</a></li>
<li class=""><a href="module_widget-stack.html" title="widget-stack">widget-stack</a></li>
<li class=""><a href="module_widget-stdmod.html" title="widget-stdmod">widget-stdmod</a></li>
<li class=""><a href="module_yui.html" title="yui">yui</a></li>
</ul>
</div>
<div id="classList" class="module">
<h4>Classes</h4>
<ul class="content">
<li class="selected"><a href="Attribute.html" title="Attribute">Attribute</a></li>
<li class=""><a href="State.html" title="State">State</a></li>
</ul>
</div>
<div id="fileList" class="module">
<h4>Files</h4>
<ul class="content">
<li class=""><a href="Attribute.js.html" title="Attribute.js">Attribute.js</a></li>
<li class=""><a href="ComplexAttribute.js.html" title="ComplexAttribute.js">ComplexAttribute.js</a></li>
<li class=""><a href="State.js.html" title="State.js">State.js</a></li>
</ul>
</div>
<div id="propertyList" class="module">
<h4>Properties</h4>
<ul class="content">
<li class="protected"><a href="#property_Attribute._ATTR_CFG" title="Attribute._ATTR_CFG">Attribute._ATTR_CFG</a></li>
<li class=""><a href="#property_Attribute.INVALID_VALUE" title="Attribute.INVALID_VALUE">Attribute.INVALID_VALUE</a></li>
</ul>
</div>
<div id="methodsList" class="module">
<h4>Methods</h4>
<ul class="content">
<li class="private"><a href="#method__addAttrs" title="_addAttrs">_addAttrs</a></li>
<li class="private"><a href="#method__addLazyAttr" title="_addLazyAttr">_addLazyAttr</a></li>
<li class="private"><a href="#method__defAttrChangeFn" title="_defAttrChangeFn">_defAttrChangeFn</a></li>
<li class="private"><a href="#method__fireAttrChange" title="_fireAttrChange">_fireAttrChange</a></li>
<li class="protected"><a href="#method__getAttr" title="_getAttr">_getAttr</a></li>
<li class="private"><a href="#method__getAttrInitVal" title="_getAttrInitVal">_getAttrInitVal</a></li>
<li class="protected"><a href="#method__getAttrs" title="_getAttrs">_getAttrs</a></li>
<li class="private"><a href="#method__getStateVal" title="_getStateVal">_getStateVal</a></li>
<li class="private"><a href="#method__isLazyAttr" title="_isLazyAttr">_isLazyAttr</a></li>
<li class="private"><a href="#method__normAttrVals" title="_normAttrVals">_normAttrVals</a></li>
<li class="protected"><a href="#method__protectAttrs" title="_protectAttrs">_protectAttrs</a></li>
<li class="protected"><a href="#method__set" title="_set">_set</a></li>
<li class="protected"><a href="#method__setAttr" title="_setAttr">_setAttr</a></li>
<li class="protected"><a href="#method__setAttrs" title="_setAttrs">_setAttrs</a></li>
<li class="private"><a href="#method__setAttrVal" title="_setAttrVal">_setAttrVal</a></li>
<li class="private"><a href="#method__setStateVal" title="_setStateVal">_setStateVal</a></li>
<li class=""><a href="#method_addAttr" title="addAttr">addAttr</a></li>
<li class=""><a href="#method_addAttrs" title="addAttrs">addAttrs</a></li>
<li class=""><a href="#method_attrAdded" title="attrAdded">attrAdded</a></li>
<li class=""><a href="#method_get" title="get">get</a></li>
<li class=""><a href="#method_getAttrs" title="getAttrs">getAttrs</a></li>
<li class=""><a href="#method_modifyAttr" title="modifyAttr">modifyAttr</a></li>
<li class=""><a href="#method_removeAttr" title="removeAttr">removeAttr</a></li>
<li class=""><a href="#method_reset" title="reset">reset</a></li>
<li class=""><a href="#method_set" title="set">set</a></li>
<li class=""><a href="#method_setAttrs" title="setAttrs">setAttrs</a></li>
</ul>
</div>
</div>
</div>
</div>
<div id="ft">
<hr />
Copyright © 2009 Yahoo! Inc. All rights reserved.
</div>
</div>
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