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HTML 

              
                <h1>Isotope - combination filters with a function, vanilla JS</h1>

<div id="filters">

  <div class="ui-group">
    <h3>Color</h3>
    <div class="button-group js-radio-button-group" data-filter-group="color">
      <button class="button is-checked" data-filter="">any</button>
      <button class="button" data-filter=".red">red</button>
      <button class="button" data-filter=".blue">blue</button>
      <button class="button" data-filter=".yellow">yellow</button>
    </div>
  </div>

  <div class="ui-group">
    <h3>Number</h3>
    <div class="button-group js-radio-button-group" data-filter-group="size">
      <button class="button is-checked" data-filter="">any</button>
      <button class="button" data-filter="greaterThan50">> 50</button>
      <button class="button" data-filter="even">even</button>
    </div>
  </div>

</div>

<div class="grid">
  <div class="color-shape small round red"><p class="number">19</p></div>
  <div class="color-shape small round blue"><p class="number">56</p></div>
  <div class="color-shape small round yellow"><p class="number">47</p></div>
  <div class="color-shape small square red"><p class="number">38</p></div>
  <div class="color-shape small square blue"><p class="number">2</p></div>
  <div class="color-shape small square yellow"><p class="number">14</p></div>
  <div class="color-shape wide round red"><p class="number">95</p></div>
  <div class="color-shape wide round blue"><p class="number">46</p></div>
  <div class="color-shape wide round yellow"><p class="number">94</p></div>
  <div class="color-shape wide square red"><p class="number">67</p></div>
  <div class="color-shape wide square blue"><p class="number">52</p></div>
  <div class="color-shape wide square yellow"><p class="number">23</p></div>
  <div class="color-shape big round red"><p class="number">48</p></div>
  <div class="color-shape big round blue"><p class="number">31</p></div>
  <div class="color-shape big round yellow"><p class="number">88</p></div>
  <div class="color-shape big square red"><p class="number">47</p></div>
  <div class="color-shape big square blue"><p class="number">16</p></div>
  <div class="color-shape big square yellow"><p class="number">27</p></div>
  <div class="color-shape tall round red"><p class="number">6</p></div>
  <div class="color-shape tall round blue"><p class="number">91</p></div>
  <div class="color-shape tall round yellow"><p class="number">75</p></div>
  <div class="color-shape tall square red"><p class="number">36</p></div>
  <div class="color-shape tall square blue"><p class="number">48</p></div>
  <div class="color-shape tall square yellow"><p class="number">38</p></div>
</div>
!

CSS 

              
                * { box-sizing: border-box; }

body {
  font-family: sans-serif;
}

/* ---- button ---- */

.button {
  display: inline-block;
  padding: 0.5em 1.0em;
  background: #EEE;
  border: none;
  border-radius: 7px;
  background-image: linear-gradient( to bottom, hsla(0, 0%, 0%, 0), hsla(0, 0%, 0%, 0.2) );
  color: #222;
  font-family: sans-serif;
  font-size: 16px;
  text-shadow: 0 1px white;
  cursor: pointer;
}

.button:hover {
  background-color: #8CF;
  text-shadow: 0 1px hsla(0, 0%, 100%, 0.5);
  color: #222;
}

.button:active,
.button.is-checked {
  background-color: #28F;
}

.button.is-checked {
  color: white;
  text-shadow: 0 -1px hsla(0, 0%, 0%, 0.8);
}

.button:active {
  box-shadow: inset 0 1px 10px hsla(0, 0%, 0%, 0.8);
}

/* ---- button-group ---- */

.button-group:after {
  content: '';
  display: block;
  clear: both;
}

.button-group .button {
  float: left;
  border-radius: 0;
  margin-left: 0;
  margin-right: 1px;
}

.button-group .button:first-child { border-radius: 0.5em 0 0 0.5em; }
.button-group .button:last-child { border-radius: 0 0.5em 0.5em 0; }

/* ---- grid ---- */

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

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

/* ui group */

.ui-group {
  display: inline-block;
}

.ui-group h3 {
  display: inline-block;
  vertical-align: top;
  line-height: 32px;
  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;
}
 
.color-shape.red { background: red; }
.color-shape.blue { background: blue; }
.color-shape.yellow { background: yellow; }
 
.color-shape.wide, .color-shape.big { width: 150px; }
.color-shape.tall, .color-shape.big { height: 150px; }

.color-shape .number {
  text-align: center;
  font-size: 24px;
  margin: 22px 0 0;
}
!

JS 

              
                // filter functions
var filterFns = {
  greaterThan50: function( itemElem ) {
    var number = itemElem.querySelector('.number').textContent;
    return parseInt( number, 10 ) > 50;
  },
  even: function( itemElem ) {
    var number = itemElem.querySelector('.number').textContent;
    return parseInt( number, 10 ) % 2 === 0;
  }
};

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

// init Isotope
var iso = new Isotope( '.grid', {
  itemSelector: '.color-shape',
  filter: function( itemElem ) {

    var isMatched = true;

    for ( var prop in filters ) {
      var filter = filters[ prop ];
      // use function if it matches
      filter = filterFns[ filter ] || filter;
      // test each filter
      var filterType = typeof filter;
      if ( filter && filterType == 'function' ) {
        isMatched = filter( itemElem );
      } else if ( filter ) {
        isMatched = matchesSelector( itemElem, filter );
      }
      // break if not matched
      if ( !isMatched ) {
        break;
      }
    }
    return isMatched;
  }
  
})

document.querySelector('#filters').addEventListener( 'click', function( event ) {
  // only work with buttons
  if ( !matchesSelector( event.target, 'button' ) ) {
    return;
  }
  // get group key
  var buttonGroup = event.target.parentNode;
  var filterGroup = buttonGroup.getAttribute('data-filter-group');
  // set filter for group
  filters[ filterGroup ] = event.target.getAttribute('data-filter');
  // arrange, and use filter fn
  iso.arrange();
});

// change is-checked class on buttons
var buttonGroups = document.querySelectorAll('.button-group');
for ( var i=0; i < buttonGroups.length; i++ ) {
  var buttonGroup = buttonGroups[i];
  radioButtonGroup( buttonGroup );
}

function radioButtonGroup( buttonGroup ) {
  buttonGroup.addEventListener( 'click', function( event ) {
    // only work with buttons
    if ( !matchesSelector( event.target, 'button' ) ) {
      return;
    }
    buttonGroup.querySelector('.is-checked').classList.remove('is-checked');
    event.target.classList.add('is-checked');
  });
}
!
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