# Yahoo! UI Library

### node 3.0.0

Yahoo! UI Library > node > nodelist.js (source view)
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    /**
     * The NodeList module provides support for managing collections of Nodes.
     * @module node
     * @submodule nodelist
     */

    /**
     * The NodeList class provides a wrapper for manipulating DOM NodeLists.
     * NodeList properties can be accessed via the set/get methods.
     * Use Y.all() to retrieve NodeList instances.
     *
     * @class NodeList
     * @constructor
     */

    var NodeList = function(nodes) {
        if (typeof nodes === 'string') {
            this._query = nodes;
            nodes = Y.Selector.query(nodes);
        } else {
            nodes = Y.Array(nodes, 0, true);
        }

        NodeList._instances[Y.stamp(this)] = this;
        this._nodes = nodes;
    };
    // end "globals"

    NodeList.NAME = 'NodeList';

    /**
     * Retrieves the DOM nodes bound to a NodeList instance
     * @method NodeList.getDOMNodes
     * @static
     *
     * @param {Y.NodeList} node The NodeList instance
     * @return {Array} The array of DOM nodes bound to the NodeList
     */
    NodeList.getDOMNodes = function(nodeList) {
        return nodeList._nodes;
    };

    NodeList._instances = [];

    NodeList.each = function(instance, fn, context) {
        var nodes = instance._nodes;
        if (nodes && nodes.length) {
            Y.Array.each(nodes, fn, context || instance);
        } else {
            Y.log('no nodes bound to ' + this, 'warn', 'NodeList');
        }
    };

    NodeList.addMethod = function(name, fn, context) {
        if (name && fn) {
            NodeList.prototype[name] = function() {
                var ret = [],
                    args = arguments;

                Y.Array.each(this._nodes, function(node) {
                    var UID = '_yuid',
                        instance = Y.Node._instances[node[UID]],
                        ctx,
                        result;

                    if (!instance) {
                        instance = NodeList._getTempNode(node);
                    }
                    ctx = context || instance;
                    result = fn.apply(ctx, args);
                    if (result !== undefined && result !== instance) {
                        ret[ret.length] = result;
                    }
                });

                // TODO: remove tmp pointer
                return ret.length ? ret : this;
            };
        } else {
            Y.log('unable to add method: ' + name, 'warn', 'Node');
        }
    };

    NodeList.importMethod = function(host, name, altName) {
        if (typeof name === 'string') {
            altName = altName || name;
            NodeList.addMethod(name, host[name]);
        } else {
            Y.each(name, function(n) {
                NodeList.importMethod(host, n);
            });
        }
    };

    NodeList._getTempNode = function(node) {
        var tmp = NodeList._tempNode;
        if (!tmp) {
            tmp = Y.Node.create('<div></div>');
            NodeList._tempNode = tmp;
        }

        tmp._node = node;
        tmp._stateProxy = node;
        return tmp;
    };

    Y.mix(NodeList.prototype, {
        /**
         * Retrieves the Node instance at the given index.
         * @method item
         *
         * @param {Number} index The index of the target Node.
         * @return {Node} The Node instance at the given index.
         */
        item: function(index) {
            return Y.one((this._nodes || [])[index]);
        },

        /**
         * Applies the given function to each Node in the NodeList.
         * @method each
         * @param {Function} fn The function to apply. It receives 3 arguments:
         * the current node instance, the node's index, and the NodeList instance
         * @param {Object} context optional An optional context to apply the function with
         * Default context is the current Node instance
         * @chainable
         */
        each: function(fn, context) {
            var instance = this;
            Y.Array.each(this._nodes, function(node, index) {
                node = Y.one(node);
                return fn.call(context || node, node, index, instance);
            });
            return instance;
        },

        batch: function(fn, context) {
            var nodelist = this;

            Y.Array.each(this._nodes, function(node, index) {
                var instance = Y.Node._instances[node[UID]];
                if (!instance) {
                    instance = NodeList._getTempNode(node);
                }

                return fn.call(context || instance, instance, index, nodelist);
            });
            return nodelist;
        },

        /**
         * Executes the function once for each node until a true value is returned.
         * @method some
         * @param {Function} fn The function to apply. It receives 3 arguments:
         * the current node instance, the node's index, and the NodeList instance
         * @param {Object} context optional An optional context to execute the function from.
         * Default context is the current Node instance
         * @return {Boolean} Whether or not the function returned true for any node.
         */
        some: function(fn, context) {
            var instance = this;
            return Y.Array.some(this._nodes, function(node, index) {
                node = Y.one(node);
                context = context || node;
                return fn.call(context, node, index, instance);
            });
        },

        /**
         * Creates a documenFragment from the nodes bound to the NodeList instance
         * @method toDocFrag
         * @return Node a Node instance bound to the documentFragment
         */
        toFrag: function() {
            return Y.one(Y.DOM._nl2frag(this._nodes));
        },

        /**
         * Returns the index of the node in the NodeList instance
         * or -1 if the node isn't found.
         * @method indexOf
         * @param {Y.Node || DOMNode} node the node to search for
         * @return {Int} the index of the node value or -1 if not found
         */
        indexOf: function(node) {
            return Y.Array.indexOf(this._nodes, Y.Node.getDOMNode(node));
        },

        /**
         * Filters the NodeList instance down to only nodes matching the given selector.
         * @method filter
         * @param {String} selector The selector to filter against
         * @return {NodeList} NodeList containing the updated collection
         * @see Selector
         */
        filter: function(selector) {
            return Y.all(Y.Selector.filter(this._nodes, selector));
        },

        /**
         * Creates a new NodeList containing all nodes at every n indices, where
         * remainder n % index equals r.
         * (zero-based index).
         * @method modulus
         * @param {Int} n The offset to use (return every nth node)
         * @param {Int} r An optional remainder to use with the modulus operation (defaults to zero)
         * @return {NodeList} NodeList containing the updated collection
         */
        modulus: function(n, r) {
            r = r || 0;
            var nodes = [];
            NodeList.each(this, function(node, i) {
                if (i % n === r) {
                    nodes.push(node);
                }
            });

            return Y.all(nodes);
        },

        /**
         * Creates a new NodeList containing all nodes at odd indices
         * (zero-based index).
         * @method odd
         * @return {NodeList} NodeList containing the updated collection
         */
        odd: function() {
            return this.modulus(2, 1);
        },

        /**
         * Creates a new NodeList containing all nodes at even indices
         * (zero-based index), including zero.
         * @method even
         * @return {NodeList} NodeList containing the updated collection
         */
        even: function() {
            return this.modulus(2);
        },

        destructor: function() {
            delete NodeList._instances[this[UID]];
        },

        /**
         * Reruns the initial query, when created using a selector query
         * @method refresh
         * @chainable
         */
        refresh: function() {
            var doc,
                nodes = this._nodes;
            if (this._query) {
                if (nodes && nodes[0] && nodes[0].ownerDocument) {
                    doc = nodes[0].ownerDocument;
                }

                this._nodes = Y.Selector.query(this._query, doc || Y.config.doc);
            }

            return this;
        },

        /**
         * Applies an event listener to each Node bound to the NodeList.
         * @method on
         * @param {String} type The event being listened for
         * @param {Function} fn The handler to call when the event fires
         * @param {Object} context The context to call the handler with.
         * Default is the NodeList instance.
         * @return {Object} Returns an event handle that can later be use to detach().
         * @see Event.on
         */
        on: function(type, fn, context) {
            var args = Y.Array(arguments, 0, true);
            args.splice(2, 0, this._nodes);
            args[3] = context || this;
            return Y.on.apply(Y, args);
        },

        /**
         * Applies an event listener to each Node bound to the NodeList.
         * The handler is called only after all on() handlers are called
         * and the event is not prevented.
         * @method after
         * @param {String} type The event being listened for
         * @param {Function} fn The handler to call when the event fires
         * @param {Object} context The context to call the handler with.
         * Default is the NodeList instance.
         * @return {Object} Returns an event handle that can later be use to detach().
         * @see Event.on
         */
        after: function(type, fn, context) {
            var args = Y.Array(arguments, 0, true);
            args.splice(2, 0, this._nodes);
            args[3] = context || this;
            return Y.after.apply(Y, args);
        },

        /**
         * Returns the current number of items in the NodeList.
         * @method size
         * @return {Int} The number of items in the NodeList.
         */
        size: function() {
            return this._nodes.length;
        },

        toString: function() {
            var str = '',
                errorMsg = this[UID] + ': not bound to any nodes',
                nodes = this._nodes,
                node;

            if (nodes && nodes[0]) {
                node = nodes[0];
                str += node[NODE_NAME];
                if (node.id) {
                    str += '#' + node.id;
                }

                if (node.className) {
                    str += '.' + node.className.replace(' ', '.');
                }

                if (nodes.length > 1) {
                    str += '...[' + nodes.length + ' items]';
                }
            }
            return str || errorMsg;
        }

    }, true);

    NodeList.importMethod(Y.Node.prototype, [
        /**
         * Called on each Node instance
         * @for NodeList
         * @method append
         * @see Node.append
         */
        'append',

        /**
          * Called on each Node instance
          * @method detach
          * @see Node.detach
          */
        'detach',

        /** Called on each Node instance
          * @method detachAll
          * @see Node.detachAll
          */
        'detachAll',

        /** Called on each Node instance
          * @method insert
          * @see NodeInsert
          */
        'insert',

        /** Called on each Node instance
          * @method prepend
          * @see Node.prepend
          */
        'prepend',

        /** Called on each Node instance
          * @method remove
          * @see Node.remove
          */
        'remove',

        /** Called on each Node instance
          * @method set
          * @see Node.set
          */
        'set',

        /** Called on each Node instance
          * @method setContent
          * @see Node.setContent
          */
        'setContent'
    ]);

    // one-off implementation to convert array of Nodes to NodeList
    // e.g. Y.all('input').get('parentNode');

    /** Called on each Node instance
      * @method get
      * @see Node
      */
    NodeList.prototype.get = function(attr) {
        var ret = [],
            nodes = this._nodes,
            isNodeList = false,
            getTemp = NodeList._getTempNode,
            instance,
            val;

        if (nodes[0]) {
            instance = Y.Node._instances[nodes[0]._yuid] || getTemp(nodes[0]);
            val = instance._get(attr);
            if (val && val.nodeType) {
                isNodeList = true;
            }
        }

        Y.Array.each(nodes, function(node) {
            instance = Y.Node._instances[node._yuid];

            if (!instance) {
                instance = getTemp(node);
            }

            val = instance._get(attr);
            if (!isNodeList) { // convert array of Nodes to NodeList
                val = Y.Node.scrubVal(val, instance);
            }

            ret.push(val);
        });

        return (isNodeList) ? Y.all(ret) : ret;
    };

    Y.NodeList = NodeList;

    Y.all = function(nodes) {
        return new NodeList(nodes);
    };

    Y.Node.all = Y.all;

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