X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;ds=sidebyside;f=bundles%2Forg.simantics.workbench.search%2Fsearch%2Fjquery.metadata.js;fp=bundles%2Forg.simantics.workbench.search%2Fsearch%2Fjquery.metadata.js;h=9da403fde9ce42afca16359852351fbd8d4ffe9a;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

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+/*
+ * Metadata - jQuery plugin for parsing metadata from elements
+ *
+ * Copyright (c) 2006 John Resig, Yehuda Katz, J�örn Zaefferer, Paul McLanahan
+ *
+ * Dual licensed under the MIT and GPL licenses:
+ *   http://www.opensource.org/licenses/mit-license.php
+ *   http://www.gnu.org/licenses/gpl.html
+ *
+ * Revision: $Id: jquery.metadata.js 3640 2007-10-11 18:34:38Z pmclanahan $
+ *
+ */
+
+/**
+ * Sets the type of metadata to use. Metadata is encoded in JSON, and each property
+ * in the JSON will become a property of the element itself.
+ *
+ * There are four supported types of metadata storage:
+ *
+ *   attr:  Inside an attribute. The name parameter indicates *which* attribute.
+ *          
+ *   class: Inside the class attribute, wrapped in curly braces: { }
+ *   
+ *   elem:  Inside a child element (e.g. a script tag). The
+ *          name parameter indicates *which* element.
+ *   html5: Values are stored in data-* attributes.
+ *          
+ * The metadata for an element is loaded the first time the element is accessed via jQuery.
+ *
+ * As a result, you can define the metadata type, use $(expr) to load the metadata into the elements
+ * matched by expr, then redefine the metadata type and run another $(expr) for other elements.
+ * 
+ * @name $.metadata.setType
+ *
+ * @example <p id="one" class="some_class {item_id: 1, item_label: 'Label'}">This is a p</p>
+ * @before $.metadata.setType("class")
+ * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
+ * @desc Reads metadata from the class attribute
+ * 
+ * @example <p id="one" class="some_class" data="{item_id: 1, item_label: 'Label'}">This is a p</p>
+ * @before $.metadata.setType("attr", "data")
+ * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
+ * @desc Reads metadata from a "data" attribute
+ * 
+ * @example <p id="one" class="some_class"><script>{item_id: 1, item_label: 'Label'}</script>This is a p</p>
+ * @before $.metadata.setType("elem", "script")
+ * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
+ * @desc Reads metadata from a nested script element
+ * 
+ * @example <p id="one" class="some_class" data-item_id="1" data-item_label="Label">This is a p</p>
+ * @before $.metadata.setType("html5")
+ * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
+ * @desc Reads metadata from a series of data-* attributes
+ *
+ * @param String type The encoding type
+ * @param String name The name of the attribute to be used to get metadata (optional)
+ * @cat Plugins/Metadata
+ * @descr Sets the type of encoding to be used when loading metadata for the first time
+ * @type undefined
+ * @see metadata()
+ */
+
+(function($) {
+
+$.extend({
+  metadata : {
+    defaults : {
+      type: 'class',
+      name: 'metadata',
+      cre: /({.*})/,
+      single: 'metadata'
+    },
+    setType: function( type, name ){
+      this.defaults.type = type;
+      this.defaults.name = name;
+    },
+    get: function( elem, opts ){
+      var settings = $.extend({},this.defaults,opts);
+      // check for empty string in single property
+      if ( !settings.single.length ) settings.single = 'metadata';
+      
+      var data = $.data(elem, settings.single);
+      // returned cached data if it already exists
+      if ( data ) return data;
+      
+      data = "{}";
+      
+      var getData = function(data) {
+        if(typeof data != "string") return data;
+        
+        if( data.indexOf('{') < 0 ) {
+          data = eval("(" + data + ")");
+        }
+      }
+      
+      var getObject = function(data) {
+        if(typeof data != "string") return data;
+        
+        data = eval("(" + data + ")");
+        return data;
+      }
+      
+      if ( settings.type == "html5" ) {
+        var object = {};
+        $( elem.attributes ).each(function() {
+          var name = this.nodeName;
+          if(name.match(/^data-/)) name = name.replace(/^data-/, '');
+          else return true;
+          object[name] = getObject(this.nodeValue);
+        });
+      } else {
+        if ( settings.type == "class" ) {
+          var m = settings.cre.exec( elem.className );
+          if ( m )
+            data = m[1];
+        } else if ( settings.type == "elem" ) {
+          if( !elem.getElementsByTagName ) return;
+          var e = elem.getElementsByTagName(settings.name);
+          if ( e.length )
+            data = $.trim(e[0].innerHTML);
+        } else if ( elem.getAttribute != undefined ) {
+          var attr = elem.getAttribute( settings.name );
+          if ( attr )
+            data = attr;
+        }
+        object = getObject(data.indexOf("{") < 0 ? "{" + data + "}" : data);
+      }
+      
+      $.data( elem, settings.single, object );
+      return object;
+    }
+  }
+});
+
+/**
+ * Returns the metadata object for the first member of the jQuery object.
+ *
+ * @name metadata
+ * @descr Returns element's metadata object
+ * @param Object opts An object contianing settings to override the defaults
+ * @type jQuery
+ * @cat Plugins/Metadata
+ */
+$.fn.metadata = function( opts ){
+  return $.metadata.get( this[0], opts );
+};
+
+})(jQuery);
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