jquery.metadata.js

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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 4187 2007-12-16 17:15:27Z joern.zaefferer $
 *
 */

(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 = "{}";
                  
                  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 undefined;
                        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;
                  }
                  
                  if ( data.indexOf( '{' ) <0 )
                  data = "{" + data + "}";
                  
                  data = eval("(" + data + ")");
                  
                  $.data( elem, settings.single, data );
                  return data;
            }
      }
});

$.fn.metadata = function( opts ){
      return $.metadata.get( this[0], opts );
};

})(jQuery);