Isotope - sort selected first

by Reusablecode

HTML

<script src="http://isotope.metafizzy.co/jquery.isotope.min.js"></script>
<div id="container">
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
</p>

CSS

.item {
  width: 50px;
  height: 50px;
  background: #AAA;
  margin: 5px;
  float: left;
}

.item.selected {
  width: 170px;
  height: 170px;
  background: red;
}

/* Start: Recommended Isotope styles */

/**** Isotope Filtering ****/

.isotope-item {
  z-index: 2;
}

.isotope-hidden.isotope-item {
  pointer-events: none;
  z-index: 1;
}

/**** Isotope CSS3 transitions ****/

.isotope,
.isotope .isotope-item {
  -webkit-transition-duration: 0.8s;
     -moz-transition-duration: 0.8s;
          transition-duration: 0.8s;
}

.isotope {
  -webkit-transition-property: height, width;
     -moz-transition-property: height, width;
          transition-property: height, width;
}

.isotope .isotope-item {
  -webkit-transition-property: -webkit-transform, opacity;
     -moz-transition-property:    -moz-transform, opacity;
          transition-property:         transform, opacity;
}

/**** disabling Isotope CSS3 transitions ****/

.isotope.no-transition,
.isotope.no-transition .isotope-item,
.isotope .isotope-item.no-transition {
  -webkit-transition-duration: 0s;
     -moz-transition-duration: 0s;
          transition-duration: 0s;
}

/* End: Recommended Isotope styles */

JavaScript

$(function(){
  
  
  var $container = $('#container'),
      $items = $('.item');
  
  $container.isotope({
    itemSelector: '.item',
    masonry: {
      columnWidth: 60
    },
    getSortData : {
      selected : function( $item ){
        // sort by selected first, then by original order
        return ($item.hasClass('selected') ? -1000 : 0 ) + $item.index();
      }
    },
    sortBy : 'selected'
  })
  
  $items.click(function(){
    var $this = $(this);
    // don't proceed if already selected
    var $previousSelected = $('.selected');
    if ( !$this.hasClass('selected') ) {
      $this.addClass('selected');
    }
    
    $previousSelected.removeClass('selected');

    // update sortData for new items size
    $container
      .isotope( 'updateSortData', $this )
      .isotope( 'updateSortData', $previousSelected )
      .isotope();
    
  });

});