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96d4a3ecf7
Due to historical reasons, the code is in subfolder "1". With SVN removal, we place the code back and remove the annoying "1" folder.
122 lines
3.8 KiB
JavaScript
122 lines
3.8 KiB
JavaScript
/*
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* Metadata - jQuery plugin for parsing metadata from elements
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*
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* Copyright (c) 2006 John Resig, Yehuda Katz, J<>örn Zaefferer, Paul McLanahan
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*
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* Dual licensed under the MIT and GPL licenses:
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* http://www.opensource.org/licenses/mit-license.php
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* http://www.gnu.org/licenses/gpl.html
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*
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* Revision: $Id$
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*
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*/
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/**
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* Sets the type of metadata to use. Metadata is encoded in JSON, and each property
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* in the JSON will become a property of the element itself.
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*
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* There are three supported types of metadata storage:
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*
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* attr: Inside an attribute. The name parameter indicates *which* attribute.
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*
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* class: Inside the class attribute, wrapped in curly braces: { }
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*
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* elem: Inside a child element (e.g. a script tag). The
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* name parameter indicates *which* element.
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*
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* The metadata for an element is loaded the first time the element is accessed via jQuery.
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*
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* As a result, you can define the metadata type, use $(expr) to load the metadata into the elements
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* matched by expr, then redefine the metadata type and run another $(expr) for other elements.
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*
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* @name $.metadata.setType
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*
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* @example <p id="one" class="some_class {item_id: 1, item_label: 'Label'}">This is a p</p>
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* @before $.metadata.setType("class")
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* @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
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* @desc Reads metadata from the class attribute
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*
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* @example <p id="one" class="some_class" data="{item_id: 1, item_label: 'Label'}">This is a p</p>
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* @before $.metadata.setType("attr", "data")
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* @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
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* @desc Reads metadata from a "data" attribute
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*
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* @example <p id="one" class="some_class"><script>{item_id: 1, item_label: 'Label'}</script>This is a p</p>
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* @before $.metadata.setType("elem", "script")
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* @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
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* @desc Reads metadata from a nested script element
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*
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* @param String type The encoding type
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* @param String name The name of the attribute to be used to get metadata (optional)
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* @cat Plugins/Metadata
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* @descr Sets the type of encoding to be used when loading metadata for the first time
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* @type undefined
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* @see metadata()
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*/
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(function($) {
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$.extend({
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metadata : {
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defaults : {
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type: 'class',
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name: 'metadata',
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cre: /({.*})/,
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single: 'metadata'
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},
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setType: function( type, name ){
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this.defaults.type = type;
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this.defaults.name = name;
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},
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get: function( elem, opts ){
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var settings = $.extend({},this.defaults,opts);
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// check for empty string in single property
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if ( !settings.single.length ) settings.single = 'metadata';
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var data = $.data(elem, settings.single);
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// returned cached data if it already exists
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if ( data ) return data;
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data = "{}";
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if ( settings.type == "class" ) {
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var m = settings.cre.exec( elem.className );
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if ( m )
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data = m[1];
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} else if ( settings.type == "elem" ) {
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if( !elem.getElementsByTagName )
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return undefined;
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var e = elem.getElementsByTagName(settings.name);
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if ( e.length )
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data = $.trim(e[0].innerHTML);
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} else if ( elem.getAttribute != undefined ) {
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var attr = elem.getAttribute( settings.name );
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if ( attr )
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data = attr;
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}
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if ( data.indexOf( '{' ) <0 )
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data = "{" + data + "}";
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data = eval("(" + data + ")");
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$.data( elem, settings.single, data );
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return data;
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}
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}
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});
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/**
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* Returns the metadata object for the first member of the jQuery object.
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*
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* @name metadata
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* @descr Returns element's metadata object
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* @param Object opts An object contianing settings to override the defaults
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* @type jQuery
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* @cat Plugins/Metadata
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*/
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$.fn.metadata = function( opts ){
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return $.metadata.get( this[0], opts );
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};
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})(jQuery); |