freenetis-github/media/js/jquery.metadata.js @ 8baed187
| 8baed187 | Michal Kliment | /*
|
|
* 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: $Id$
|
|||
*
|
|||
*/
|
|||
/**
|
|||
* 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 three 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.
|
|||
*
|
|||
* 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; $("#one").metadata().item_label == "Label"
|
|||
* @desc Reads metadata from a nested script element
|
|||
*
|
|||
* @param String type The encoding type
|
|||
* @param String name The name of the attribute to be used to get metadata (optional)
|
|||
* @cat Plugins/Metadata
|
|||
* @descr Sets the type of encoding to be used when loading metadata for the first time
|
|||
* @type undefined
|
|||
* @see metadata()
|
|||
*/
|
|||
(function($) {
|
|||
$.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 = "{}";
|
|||
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;
|
|||
}
|
|||
}
|
|||
});
|
|||
/**
|
|||
* 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);
|