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                <h1>Isotope - combination filters with selects</h1>

<div class="filters">

  <div class="ui-group">
    <select class="filter-select" value-group="color">
      <option value="">any</option>
      <option value=".red">red</option>
      <option value=".blue">blue</option>
      <option value=".yellow">yellow</option>

  <div class="ui-group">
    <select class="filter-select" value-group="size">
      <option value="">any</option>
      <option value=".small">small</option>
      <option value=".wide">wide</option>
      <option value=".big">big</option>
      <option value=".tall">tall</option>

  <div class="ui-group">
    <select class="filter-select" value-group="shape">
      <option value="">any</option>
      <option value=".round">round</option>
      <option value=".square">square</option>


<div class="grid">
  <div class="color-shape small round red"></div>
  <div class="color-shape small round blue"></div>
  <div class="color-shape small round yellow"></div>
  <div class="color-shape small square red"></div>
  <div class="color-shape small square blue"></div>
  <div class="color-shape small square yellow"></div>
  <div class="color-shape wide round red"></div>
  <div class="color-shape wide round blue"></div>
  <div class="color-shape wide round yellow"></div>
  <div class="color-shape wide square red"></div>
  <div class="color-shape wide square blue"></div>
  <div class="color-shape wide square yellow"></div>
  <div class="color-shape big round red"></div>
  <div class="color-shape big round blue"></div>
  <div class="color-shape big round yellow"></div>
  <div class="color-shape big square red"></div>
  <div class="color-shape big square blue"></div>
  <div class="color-shape big square yellow"></div>
  <div class="color-shape tall round red"></div>
  <div class="color-shape tall round blue"></div>
  <div class="color-shape tall round yellow"></div>
  <div class="color-shape tall square red"></div>
  <div class="color-shape tall square blue"></div>
  <div class="color-shape tall square yellow"></div>



                * { box-sizing: border-box; }

body {
  font-family: sans-serif;

/* ---- isotope ---- */

.grid {
  background: #EEE;
  max-width: 1200px;

/* clear fix */
.grid:after {
  content: '';
  display: block;
  clear: both;

/* ui group */

.ui-group {
  display: inline-block;
  margin-right: 20px;

.ui-group h3 {
  display: inline-block;
  margin-right: 0.2em;
  font-size: 16px;

.ui-group .button-group {
  display: inline-block;
  margin-right: 20px;

/* color-shape */

.color-shape {
  width: 70px;
  height: 70px;
  margin: 5px;
  float: left;
.color-shape.round {
  border-radius: 35px;
.color-shape.big.round {
  border-radius: 75px;
} { background: red; } { background: blue; }
.color-shape.yellow { background: yellow; }
.color-shape.wide, .color-shape.big { width: 150px; }
.color-shape.tall, .color-shape.big { height: 150px; }


                // external js: isotope.pkgd.js

// init Isotope
var $grid = $('.grid').isotope({
  itemSelector: '.color-shape'

// store filter for each group
var filters = {};

$('.filters').on( 'change', function( event ) {
  var $select = $( );
  // get group key
  var filterGroup = $select.attr('value-group');
  // set filter for group
  filters[ filterGroup ] =;
  // combine filters
  var filterValue = concatValues( filters );
  // set filter for Isotope
  $grid.isotope({ filter: filterValue });

// flatten object by concatting values
function concatValues( obj ) {
  var value = '';
  for ( var prop in obj ) {
    value += obj[ prop ];
  return value;