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67 lines
3.4 KiB
JavaScript
67 lines
3.4 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, Jörn 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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*/
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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; $("#one").metadata().item_label == "Label"
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* @desc Reads metadata from a nested script element
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*
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* @param String type The encoding type
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* @param String name The name of the attribute to be used to get metadata (optional)
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* @cat Plugins/Metadata
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* @descr Sets the type of encoding to be used when loading metadata for the first time
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* @type undefined
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* @see metadata()
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*/
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!function($){$.extend({metadata:{defaults:{type:"class",name:"metadata",cre:/(\{.*\})/,single:"metadata"},setType:function(a,b){this.defaults.type=a,this.defaults.name=b},get:function(elem,opts){var data,m,e,attr,settings=$.extend({},this.defaults,opts);
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// returned cached data if it already exists
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if(
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// check for empty string in single property
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settings.single.length||(settings.single="metadata"),data=$.data(elem,settings.single))return data;if(data="{}","class"===settings.type)m=settings.cre.exec(elem.className),m&&(data=m[1]);else if("elem"===settings.type){if(!elem.getElementsByTagName)return void 0;e=elem.getElementsByTagName(settings.name),e.length&&(data=$.trim(e[0].innerHTML))}else void 0!==elem.getAttribute&&(attr=elem.getAttribute(settings.name),attr&&(data=attr));/*jshint evil:true */
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return data.indexOf("{")<0&&(data="{"+data+"}"),data=eval("("+data+")"),$.data(elem,settings.single,data),data}}}),/**
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* Returns the metadata object for the first member of the jQuery object.
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*
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* @name metadata
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* @descr Returns element's metadata object
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* @param Object opts An object contianing settings to override the defaults
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* @type jQuery
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* @cat Plugins/Metadata
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*/
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$.fn.metadata=function(a){return $.metadata.get(this[0],a)}}(jQuery); |