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/*
* Metadata - jQuery plugin for parsing metadata from elements
*
* Copyright (c) 2006 John Resig, Yehuda Katz, J�rn Zaefferer
*
* Dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
*
* Revision: $Id$
*
*/
/**
* Sets the type of metadata to use. Metadata is encoded in JSON, and each property
* in the JSON will become a property of the element itself.
*
* There are three supported types of metadata storage:
*
* attr: Inside an attribute. The name parameter indicates *which* attribute.
*
* class: Inside the class attribute, wrapped in curly braces: { }
*
* elem: Inside a child element (e.g. a script tag). The
* name parameter indicates *which* element.
*
* The metadata for an element is loaded the first time the element is accessed via jQuery.
*
* As a result, you can define the metadata type, use $(expr) to load the metadata into the elements
* matched by expr, then redefine the metadata type and run another $(expr) for other elements.
*
* @name $.meta.setType
*
* @example <p id="one" class="some_class {item_id: 1, item_label: 'Label'}">This is a p</p>
* @before $.meta.setType("class")
* @after $("#one").data().item_id == 1; $("#one")[0].item_label == "Label"
* @desc Reads metadata from the class attribute
*
* @example <p id="one" class="some_class" data="{item_id: 1, item_label: 'Label'}">This is a p</p>
* @before $.meta.setType("attr", "data")
* @after $("#one").data().item_id == 1; $("#one")[0].item_label == "Label"
* @desc Reads metadata from a "data" attribute
*
* @example <p id="one" class="some_class"><script>{item_id: 1, item_label: 'Label'}</script>This is a p</p>
* @before $.meta.setType("elem", "script")
* @after $("#one").data().item_id == 1; $("#one")[0].item_label == "Label"
* @desc Reads metadata from a nested script element
*
* @param String type The encoding type
* @param String name The name of the attribute to be used to get metadata (optional)
* @cat Plugins/Metadata
* @descr Sets the type of encoding to be used when loading metadata for the first time
* @type undefined
* @see data()
*/
(function($) {
// settings
$.meta = {
type: "class",
name: "data",
setType: function(type,name){
this.type = type;
this.name = name;
},
cre: /({.*})/,
single: 'data'
};
// reference to original setArray()
var setArray = $.fn.setArray;
// define new setArray()
$.fn.setArray = function(arr){
return setArray.apply( this, arguments ).each(function(){
if ( this.nodeType == 9 || $.isXMLDoc(this) || this.metaDone ) return;
var data = "{}";
if ( $.meta.type == "class" ) {
var m = $.meta.cre.exec( this.className );
if ( m )
data = m[1];
} else if ( $.meta.type == "elem" ) {
if( !this.getElementsByTagName ) return;
var e = this.getElementsByTagName($.meta.name);
if ( e.length )
data = $.trim(e[0].innerHTML);
} else if ( this.getAttribute != undefined ) {
var attr = this.getAttribute( $.meta.name );
if ( attr )
data = attr;
}
if ( !/^{/.test( data ) )
data = "{" + data + "}";
eval("data = " + data);
if ( $.meta.single )
this[ $.meta.single ] = data;
else
$.extend( this, data );
this.metaDone = true;
});
};
/**
* Returns the metadata object for the first member of the jQuery object.
*
* @name data
* @descr Returns element's metadata object
* @type jQuery
* @cat Plugins/Metadata
*/
$.fn.data = function(){
return this[0][$.meta.single || "data"];
};
})(jQuery);
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