File yui3/src/node/js/nodelist.js
/**
* The NodeList module provides support for managing collections of Nodes.
* @module node
* @submodule node-core
*/
/**
* 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
* @param nodes {String|element|Node|Array} A selector, DOM element, Node, list of DOM elements, or list of Nodes with which to populate this NodeList.
*/
var NodeList = function(nodes) {
var tmp = [];
if (nodes) {
if (typeof nodes === 'string') { // selector query
this._query = nodes;
nodes = Y.Selector.query(nodes);
} else if (nodes.nodeType || Y_DOM.isWindow(nodes)) { // domNode || window
nodes = [nodes];
} else if (nodes._node) { // Y.Node
nodes = [nodes._node];
} else if (nodes[0] && nodes[0]._node) { // allow array of Y.Nodes
Y.Array.each(nodes, function(node) {
if (node._node) {
tmp.push(node._node);
}
});
nodes = tmp;
} else { // array of domNodes or domNodeList (no mixed array of Y.Node/domNodes)
nodes = Y.Array(nodes, 0, true);
}
}
/**
* The underlying array of DOM nodes bound to the Y.NodeList instance
* @property _nodes
* @private
*/
this._nodes = nodes || [];
};
NodeList.NAME = 'NodeList';
/**
* Retrieves the DOM nodes bound to a NodeList instance
* @method getDOMNodes
* @static
*
* @param {NodeList} nodelist The NodeList instance
* @return {Array} The array of DOM nodes bound to the NodeList
*/
NodeList.getDOMNodes = function(nodelist) {
return (nodelist && nodelist._nodes) ? nodelist._nodes : nodelist;
};
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 = (node.uniqueID && node.nodeType !== 9 ) ? 'uniqueID' : '_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 + ' to NodeList', 'warn', 'node');
}
};
/**
* Import the named method, or methods from the host onto NodeList.
*
* @method importMethod
* @static
* @param {Object} host The object containing the methods to copy. Typically a prototype.
* @param {String|String[]} name The name, or an Array of names of the methods to import onto NodeList.
* @param {String} [altName] An alternative name to use for the method added to NodeList, which may differ from the name
* of the original host object. Has no effect if <em>name</em> is an array of method names.
*/
NodeList.importMethod = function(host, name, altName) {
if (typeof name === 'string') {
altName = altName || name;
NodeList.addMethod(altName, host[name]);
} else {
Y.Array.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, {
_invoke: function(method, args, getter) {
var ret = (getter) ? [] : this;
this.each(function(node) {
var val = node[method].apply(node, args);
if (getter) {
ret.push(val);
}
});
return ret;
},
/**
* 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 toFrag
* @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 {Node | HTMLElement} node the node to search for
* @return {Number} 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 {Number} n The offset to use (return every nth node)
* @param {Number} 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() {
},
/**
* Reruns the initial query, when created using a selector query
* @method refresh
* @chainable
*/
refresh: function() {
var doc,
nodes = this._nodes,
query = this._query,
root = this._queryRoot;
if (query) {
if (!root) {
if (nodes && nodes[0] && nodes[0].ownerDocument) {
root = nodes[0].ownerDocument;
}
}
this._nodes = Y.Selector.query(query, root);
}
return this;
},
/**
* Returns the current number of items in the NodeList.
* @method size
* @return {Number} The number of items in the NodeList.
*/
size: function() {
return this._nodes.length;
},
/**
* Determines if the instance is bound to any nodes
* @method isEmpty
* @return {Boolean} Whether or not the NodeList is bound to any nodes
*/
isEmpty: function() {
return this._nodes.length < 1;
},
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;
},
/**
* Returns the DOM node bound to the Node instance
* @method getDOMNodes
* @return {Array}
*/
getDOMNodes: function() {
return this._nodes;
}
}, true);
NodeList.importMethod(Y.Node.prototype, [
/**
* Called on each Node instance. Nulls internal node references,
* removes any plugins and event listeners
* @method destroy
* @param {Boolean} recursivePurge (optional) Whether or not to
* remove listeners from the node's subtree (default is false)
* @see Node.destroy
*/
'destroy',
/**
* Called on each Node instance. Removes and destroys all of the nodes
* within the node
* @method empty
* @chainable
* @see Node.empty
*/
'empty',
/**
* Called on each Node instance. Removes the node from its parent.
* Shortcut for myNode.get('parentNode').removeChild(myNode);
* @method remove
* @param {Boolean} destroy whether or not to call destroy() on the node
* after removal.
* @chainable
* @see Node.remove
*/
'remove',
/**
* Called on each Node instance. Sets an attribute on the Node instance.
* Unless pre-configured (via Node.ATTRS), set hands
* off to the underlying DOM node. Only valid
* attributes/properties for the node will be set.
* To set custom attributes use setAttribute.
* @method set
* @param {String} attr The attribute to be set.
* @param {any} val The value to set the attribute to.
* @chainable
* @see Node.set
*/
'set'
]);
// 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;