| /* |
| * Metadata - jQuery plugin for parsing metadata from elements |
| * |
| * Copyright (c) 2006 John Resig, Yehuda Katz, J�örn Zaefferer, Paul McLanahan |
| * |
| * 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 $.metadata.setType |
| * |
| * @example <p id="one" class="some_class {item_id: 1, item_label: 'Label'}">This is a p</p> |
| * @before $.metadata.setType("class") |
| * @after $("#one").metadata().item_id == 1; $("#one").metadata().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 $.metadata.setType("attr", "data") |
| * @after $("#one").metadata().item_id == 1; $("#one").metadata().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 $.metadata.setType("elem", "script") |
| * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label" |
| * @desc Reads metadata from a nested script element |
| * |
| * @param String type The encoding type |
| * @param String name The name of the attribute to be used to get metadata (optional) |
| * @cat Plugins/Metadata |
| * @descr Sets the type of encoding to be used when loading metadata for the first time |
| * @type undefined |
| * @see metadata() |
| */ |
| |
| (function($) { |
| |
| $.extend({ |
| metadata : { |
| defaults : { |
| type: 'class', |
| name: 'metadata', |
| cre: /({.*})/, |
| single: 'metadata' |
| }, |
| setType: function( type, name ){ |
| this.defaults.type = type; |
| this.defaults.name = name; |
| }, |
| get: function( elem, opts ){ |
| var settings = $.extend({},this.defaults,opts); |
| // check for empty string in single property |
| if ( !settings.single.length ) settings.single = 'metadata'; |
| |
| var data = $.data(elem, settings.single); |
| // returned cached data if it already exists |
| if ( data ) return data; |
| |
| data = "{}"; |
| |
| if ( settings.type == "class" ) { |
| var m = settings.cre.exec( elem.className ); |
| if ( m ) |
| data = m[1]; |
| } else if ( settings.type == "elem" ) { |
| if( !elem.getElementsByTagName ) |
| return undefined; |
| var e = elem.getElementsByTagName(settings.name); |
| if ( e.length ) |
| data = $.trim(e[0].innerHTML); |
| } else if ( elem.getAttribute != undefined ) { |
| var attr = elem.getAttribute( settings.name ); |
| if ( attr ) |
| data = attr; |
| } |
| |
| if ( data.indexOf( '{' ) <0 ) |
| data = "{" + data + "}"; |
| |
| data = eval("(" + data + ")"); |
| |
| $.data( elem, settings.single, data ); |
| return data; |
| } |
| } |
| }); |
| |
| /** |
| * Returns the metadata object for the first member of the jQuery object. |
| * |
| * @name metadata |
| * @descr Returns element's metadata object |
| * @param Object opts An object contianing settings to override the defaults |
| * @type jQuery |
| * @cat Plugins/Metadata |
| */ |
| $.fn.metadata = function( opts ){ |
| return $.metadata.get( this[0], opts ); |
| }; |
| |
| })(jQuery); |