Alex
6 years ago
8 changed files with 1183 additions and 4 deletions
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/* |
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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); |
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