node/js/nodelist.js

	nodelist.js revision 9841e3eef70e7a083ae0b371f33eb340ad3b6a54
/**
 * 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
 */

Y.Array._diff = function(a, b) {
    var removed = [],
        present = false,
        i, j, lenA, lenB;

    outer:
    for (i = 0, lenA = a.length; i < lenA; i++) {
        present = false;
        for (j = 0, lenB = b.length; j < lenB; j++) {
            if (a[i] === b[j]) {
                present = true;
                continue outer;
            }
        }
        if (!present) {
            removed[removed.length] = a[i];
        }
    }
    return removed;
};

Y.Array.diff = function(a, b) {
    return {
        added: Y.Array._diff(b, a),
        removed: Y.Array._diff(a, b)
    };
};

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.get((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.get(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.get(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.get(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]];
    },

    refresh: function() {
        var doc,
            diff,
            oldList = this._nodes;
        if (this._query) {
            if (oldList && oldList[0] && oldList[0].ownerDocument) {
                doc = oldList[0].ownerDocument;
            }

            this._nodes = Y.Selector.query(this._query, doc || Y.config.doc);
            diff = Y.Array.diff(oldList, this._nodes);
            diff.added = diff.added ? Y.all(diff.added) : null;
            diff.removed = diff.removed ? Y.all(diff.removed) : null;
            this.fire('refresh', diff);
        }
        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, etc) {
        var args = Y.Array(arguments);
        args[2] = context || this;
        this.batch(function(node) {
            node.on.apply(node, 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, etc) {
        var args = Y.Array(arguments);
        args[2] = context || this;
        this.batch(function(node) {
            node.after.apply(node, 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;