https://www.zitate.de/assets/c7b9c917/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 3640 2007-10-11 18:34:38Z pmclanahan $
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 four 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 *   html5: Values are stored in data-* attributes.
27 *
28 * The metadata for an element is loaded the first time the element is accessed via jQuery.
29 *
30 * As a result, you can define the metadata type, use $(expr) to load the metadata into the elements
31 * matched by expr, then redefine the metadata type and run another $(expr) for other elements.
32 *
33 * @name $.metadata.setType
34 *
35 * @example <p id="one" class="some_class {item_id: 1, item_label: 'Label'}">This is a p</p>
36 * @before $.metadata.setType("class")
37 * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
38 * @desc Reads metadata from the class attribute
39 *
40 * @example <p id="one" class="some_class" data="{item_id: 1, item_label: 'Label'}">This is a p</p>
41 * @before $.metadata.setType("attr", "data")
42 * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
43 * @desc Reads metadata from a "data" attribute
44 *
45 * @example <p id="one" class="some_class"><script>{item_id: 1, item_label: 'Label'}</script>This is a p</p>
46 * @before $.metadata.setType("elem", "script")
47 * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
48 * @desc Reads metadata from a nested script element
49 *
50 * @example <p id="one" class="some_class" data-item_id="1" data-item_label="Label">This is a p</p>
51 * @before $.metadata.setType("html5")
52 * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
53 * @desc Reads metadata from a series of data-* attributes
54 *
55 * @param String type The encoding type
56 * @param String name The name of the attribute to be used to get metadata (optional)
57 * @cat Plugins/Metadata
58 * @descr Sets the type of encoding to be used when loading metadata for the first time
59 * @type undefined
60 * @see metadata()
61 */
62
63(function($) {
64
65$.extend({
66  metadata : {
67    defaults : {
68      type: 'class',
69      name: 'metadata',
70      cre: /({.*})/,
71      single: 'metadata'
72    },
73    setType: function( type, name ){
74      this.defaults.type = type;
75      this.defaults.name = name;
76    },
77    get: function( elem, opts ){
78      var settings = $.extend({},this.defaults,opts);
79      // check for empty string in single property
80      if ( !settings.single.length ) settings.single = 'metadata';
81
82      var data = $.data(elem, settings.single);
83      // returned cached data if it already exists
84      if ( data ) return data;
85
86      data = "{}";
87
88      var getData = function(data) {
89        if(typeof data != "string") return data;
90
91        if( data.indexOf('{') < 0 ) {
92          data = eval("(" + data + ")");
93        }
94      };
95
96      var getObject = function(data) {
97        if(typeof data != "string") return data;
98
99        data = eval("(" + data + ")");
100        return data;
101      };
102
103      if ( settings.type == "html5" ) {
104        var object = {};
105        $( elem.attributes ).each(function() {
106          var name = this.nodeName;
107          if(name.match(/^data-/)) name = name.replace(/^data-/, '');
108          else return true;
109          object[name] = getObject(this.nodeValue);
110        });
111      } else {
112        if ( settings.type == "class" ) {
113          var m = settings.cre.exec( elem.className );
114          if ( m )
115            data = m[1];
116        } else if ( settings.type == "elem" ) {
117          if( !elem.getElementsByTagName ) return;
118          var e = elem.getElementsByTagName(settings.name);
119          if ( e.length )
120            data = $.trim(e[0].innerHTML);
121        } else if ( elem.getAttribute != undefined ) {
122          var attr = elem.getAttribute( settings.name );
123          if ( attr )
124            data = attr;
125        }
126        object = getObject(data.indexOf("{") < 0 ? "{" + data + "}" : data);
127      }
128
129      $.data( elem, settings.single, object );
130      return object;
131    }
132  }
133});
134
135/**
136 * Returns the metadata object for the first member of the jQuery object.
137 *
138 * @name metadata
139 * @descr Returns element's metadata object

140 * @param Object opts An object contianing settings to override the defaults
141 * @type jQuery
142 * @cat Plugins/Metadata
143 */
144$.fn.metadata = function( opts ){
145  return $.metadata.get( this[0], opts );
146};
147
148})(jQuery);