https://svma.or.kr/js/jquery/jquery.metadata.js

1/*
2 * Metadata - jQuery plugin for parsing metadata from elements
3 *
4 * Copyright (c) 2006 John Resig, Yehuda Katz, J�örn Zaefferer, Paul McLanahan
5 *
6 * Dual licensed under the MIT and GPL licenses:
7 *   http://www.opensource.org/licenses/mit-license.php
8 *   http://www.gnu.org/licenses/gpl.html
9 *
10 * Revision: $Id: jquery.metadata.js,v 1.1 2012/11/26 05:08:10 SGO1004002 Exp $
11 *
12 */
13
14/**
15 * Sets the type of metadata to use. Metadata is encoded in JSON, and each property
16 * in the JSON will become a property of the element itself.
17 *
18 * There are three supported types of metadata storage:
19 *
20 *   attr:  Inside an attribute. The name parameter indicates *which* attribute.
21 *          
22 *   class: Inside the class attribute, wrapped in curly braces: { }
23 *   
24 *   elem:  Inside a child element (e.g. a script tag). The
25 *          name parameter indicates *which* element.
26 *          
27 * The metadata for an element is loaded the first time the element is accessed via jQuery.
28 *
29 * As a result, you can define the metadata type, use $(expr) to load the metadata into the elements
30 * matched by expr, then redefine the metadata type and run another $(expr) for other elements.
31 * 
32 * @name $.metadata.setType
33 *
34 * @example <p id="one" class="some_class {item_id: 1, item_label: 'Label'}">This is a p</p>
35 * @before $.metadata.setType("class")
36 * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
37 * @desc Reads metadata from the class attribute
38 * 
39 * @example <p id="one" class="some_class" data="{item_id: 1, item_label: 'Label'}">This is a p</p>
40 * @before $.metadata.setType("attr", "data")
41 * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
42 * @desc Reads metadata from a "data" attribute
43 * 
44 * @example <p id="one" class="some_class"><script>{item_id: 1, item_label: 'Label'}</script>This is a p</p>
45 * @before $.metadata.setType("elem", "script")
46 * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
47 * @desc Reads metadata from a nested script element
48 * 
49 * @param String type The encoding type
50 * @param String name The name of the attribute to be used to get metadata (optional)
51 * @cat Plugins/Metadata
52 * @descr Sets the type of encoding to be used when loading metadata for the first time
53 * @type undefined
54 * @see metadata()
55 */
56
57(function($) {
58
59$.extend({
60	metadata : {
61		defaults : {
62			//type: 'class',
63			type: 'attr',
64			//name: 'metadata',
65			name: 'validate',
66			cre: /({.*})/,
67			single: 'metadata'
68		},
69		setType: function( type, name ){
70			this.defaults.type = type;
71			this.defaults.name = name;
72		},
73		get: function( elem, opts ){
74			var settings = $.extend({},this.defaults,opts);
75			// check for empty string in single property
76			if ( !settings.single.length ) settings.single = 'metadata';
77			
78			var data = $.data(elem, settings.single);
79			// returned cached data if it already exists
80			if ( data ) return data;
81			
82			data = "{}";
83			
84			if ( settings.type == "class" ) {
85				var m = settings.cre.exec( elem.className );
86				if ( m )
87					data = m[1];
88			} else if ( settings.type == "elem" ) {
89				if( !elem.getElementsByTagName )
90					return undefined;
91				var e = elem.getElementsByTagName(settings.name);
92				if ( e.length )
93					data = $.trim(e[0].innerHTML);
94			} else if ( elem.getAttribute != undefined ) {
95				var attr = elem.getAttribute( settings.name );
96				if ( attr )
97					data = attr;
98			}
99			
100			if ( data.indexOf( '{' ) <0 )
101			data = "{" + data + "}";
102			
103			data = eval("(" + data + ")");
104			
105			$.data( elem, settings.single, data );
106			return data;
107		}
108	}
109});
110
111/**
112 * Returns the metadata object for the first member of the jQuery object.
113 *
114 * @name metadata
115 * @descr Returns element's metadata object
116 * @param Object opts An object contianing settings to override the defaults
117 * @type jQuery
118 * @cat Plugins/Metadata
119 */
120$.fn.metadata = function( opts ){
121	return $.metadata.get( this[0], opts );
122};

123
124})(jQuery);