src & docs : officialize shuffle method; add random sort order

_includes/elements-demo-foot.html

@@ -51,12 +51,13 @@
 
     {% include add-buttons.js %}
 
+    var $sortBy = $('#sort-by');
     $('#shuffle a').click(function(){
       $container.isotope('shuffle');
+      $sortBy.find('.selected').removeClass('selected');
+      $sortBy.find('[data-option-value="random"]').addClass('selected');
       return false;
     });
-    
-
 
 
   });

_includes/elements-demo-head.html

@@ -13,10 +13,10 @@
   <h3>Etc</h3>
 
   <ul id="etc" class="clearfix">
-
     <li id="toggle-sizes"><a href="#toggle-sizes">Toggle variable sizes</a></li>
     <li id="insert"><a href="#insert">Insert new elements</a></li>
     <li id="append"><a href='#append'>Append new elements</a></li>
-    <!-- <li id="shuffle"><a href='#shuffle'>Shuffle</a></li> -->
+    <li id="shuffle"><a href='#shuffle'>Shuffle</a></li>
   </ul>
+
 </section> <!-- #options -->

_includes/sort-buttons.html

@@ -1,13 +1,14 @@
 
     <h3>Sort</h3>
 
-    <ul id="sort" class="sort option-set clearfix" data-option-key="sortBy">
+    <ul id="sort-by" class="option-set clearfix" data-option-key="sortBy">
       <li><a href="#sortBy=original-order" data-option-value="original-order" class="selected" data>original-order</a></li>
       <li><a href="#sortBy=name" data-option-value="name">name</a></li>
       <li><a href="#sortBy=symbol" data-option-value="symbol">symbol</a></li>
       <li><a href="#sortBy=number" data-option-value="number">number</a></li>
       <li><a href="#sortBy=weight"  data-option-value="weight">weight</a></li>
       <li><a href="#sortBy=category" data-option-value="category">category</a></li>
+      <li><a href="#sortBy=random" data-option-value="random">random</a></li>
     </ul>
 
     <h3>Sort direction</h3>

_posts/demos/2011-06-13-hash-history.html

@@ -33,6 +33,7 @@ category: demos
       <li><a href="#sortBy=number">number</a></li>
       <li><a href="#sortBy=weight">weight</a></li>
       <li><a href="#sortBy=category">category</a></li>
+      <li><a href="#sortBy=random">random</a></li>
     </ul>
   
     <h3>Sort direction</h3>

_posts/docs/2010-12-04-methods.mdown

@@ -13,6 +13,7 @@ toc:
   - { title: reLayout, anchor: relayout }
   - { title: reloadItems, anchor: reloaditems }
   - { title: remove, anchor: remove }
+  - { title: shuffle, anchor: shuffle }
   - { title: updateSortData, anchor: updatesortdata }
 
 ---
@@ -135,6 +136,16 @@ Re-collects all item elements in their current order in the DOM.  Useful for pre
 
 Removes specified item elements from Isotope widget and the DOM.
 
+## shuffle
+
+{% highlight javascript %}
+
+.isotope( 'shuffle' )
+
+{% endhighlight %}
+
+Shuffles order of items. Sets [`sortBy` option](options.html#sortby) to [`'random'`](sorting.html#sortby_option).
+
 ## updateSortData
 
 {% highlight javascript %}

_posts/docs/2010-12-07-sorting.mdown

@@ -121,7 +121,10 @@ $('#container').isotope({ sortBy : 'symbol' });
 
 {% endhighlight %}
 
-There is an additional sorting data built in to Isotope `'original-order'`. Sorting with `'original-order'` will use the original order of the item elements to arrange them in the layout.
+There are two additional sorting data methods built in to Isotope. 
+
++ `'original-order'` will use the original order of the item elements to arrange them in the layout.
++ `'random'` is a random order.
 
 ## sortAscending option
 

jquery.isotope.js

@@ -1,5 +1,5 @@
 /**
- * Isotope v1.3.110623
+ * Isotope v1.4.110629
  * An exquisite jQuery plugin for magical layouts
  * http://isotope.metafizzy.co
  *
@@ -378,6 +378,9 @@
       var originalOrderSorter = {
         'original-order' : function( $elem, instance ) {
           return instance.elemCount;
+        },
+        random : function() {
+          return Math.random();
         }
       };
 
@@ -695,28 +698,11 @@
       
     },
     
-    _shuffleArray : function ( array ) {
-      var tmp, current, i = array.length;
-      
-      if ( i ){ 
-        while(--i) {
-          current = ~~( Math.random() * (i + 1) );
-          tmp = array[current];
-          array[current] = array[i];
-          array[i] = tmp;
-        }
-      }
-      return array;
-    },
-    
-    // HACKy should probably remove
-    shuffle : function( callback ) {
-      this.options.sortBy = 'shuffle';
-      
-      this.$allAtoms = this._shuffleArray( this.$allAtoms );
-      this.$filteredAtoms = this._filter( this.$allAtoms );
-      
-      this.reLayout( callback );
+    shuffle : function() {
+      this.updateSortData( this.$allAtoms );
+      this.options.sortBy = 'random';
+      this._sort();
+      this.reLayout();
     },
     
     // destroys widget, returns elements and container back (close) to original style