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HTML

              
                <form class="controls" id="Filters">
  <!-- We can add an unlimited number of "filter groups" using the following format: -->
  
  <fieldset class="filter-group checkboxes">
    <h4>Shapes</h4>
    <div class="checkbox">
      <input type="checkbox" value=".square"/>
      <label>Square</label>
    </div>
    <div class="checkbox">
      <input type="checkbox" value=".circle"/>
      <label>Circle</label>
    </div>
    <div class="checkbox">
      <input type="checkbox" value=".triangle"/>
      <label>Triangle</label>
    </div>
  </fieldset>
  
  <fieldset class="filter-group checkboxes">
    <h4>Colours</h4>
    <div class="checkbox">
      <input type="checkbox" value=".white"/>
      <label>White</label>
    </div>
    <div class="checkbox">
      <input type="checkbox" value=".green"/>
      <label>Green</label>
    </div>
    <div class="checkbox">
      <input type="checkbox" value=".blue"/>
      <label>Blue</label>
    </div>
  </fieldset>
  
  <fieldset class="filter-group checkboxes">
    <h4>Sizes</h4>
    <div class="checkbox">
      <input type="checkbox" value=".sm"/>
      <label>Small</label>
    </div>
    <div class="checkbox">
      <input type="checkbox" value=".lrg"/>
      <label>Large</label>
    </div>
  </fieldset>
  
  <fieldset class="filter-group search">
    <h4>Search</h4>
    <input type="text" placeholder="Search ..."/>
  </fieldset>
  
  <button id="Reset">Clear Filters</button>
</form>

<div id="Container" class="container">
  <div class="fail-message"><span>No items were found matching the selected filters</span></div>
  
  <div class="mix triangle white lrg"></div>
  <div class="mix square white sm"></div>
  <div class="mix circle green lrg"></div>
  <div class="mix triangle blue lrg"></div>
  <div class="mix square white lrg"></div>
  <div class="mix circle blue sm"></div>
  <div class="mix triangle green lrg"></div>
  <div class="mix square blue lrg"></div>
  <div class="mix circle white lrg"></div>
  
  <div class="gap"></div>
  <div class="gap"></div>
  <div class="gap"></div>
  <div class="gap"></div>
</div>
    
              
            
!

CSS

              
                body{
  background: #68b8c4;
}

body, button{
  font-family: 'Helvetica Neue', arial, sans-serif;
  color: white;
  -webkit-font-smoothing: antialiased;
}
 
/**
 * Form & Checkbox Styles
 */

h4{
  font-weight: 700;
  margin-bottom: .5em;
}
 
label{
  font-weight: 300;
}

input[type="text"] {
  font-family: 'helvetica';
  font-size: 14px;
  border: 1px solid transparent;
  padding: .5em;
  border-radius: 2px;
}

input[type="text"]:focus {
  outline: 0 none;
  border-color: #68b8c4;
}
 
button{
  display: inline-block;
  vertical-align: top;
  padding: .4em .8em;
  margin: 0;
  background: #68b8c4;
  border: 0;
  color: #333;
  font-size: 16px;
  font-weight: 700;
  border-radius: 4px;
  cursor: pointer;
}
 
button:focus{
  outline: 0 none;
}
 
.controls{
  background: #333;
  padding: 2%;
}
 
fieldset{
  display: inline-block;
  vertical-align: top;
  margin: 0 1em 0 0;
  background: #666;
  padding: .5em;
  border-radius: 3px;
}

.checkbox{
  display: block;
  position: relative;
  cursor: pointer;
  margin-bottom: 8px;
}

.checkbox input[type="checkbox"]{
  position: absolute;
  display: block;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  cursor: pointer;
  margin: 0;
  opacity: 0;
  z-index: 1;
}

.checkbox label{
  display: inline-block;
  vertical-align: top;
  text-align: left;
  padding-left: 1.5em;
}

.checkbox label:before,
.checkbox label:after{
  content: '';
  display: block;
  position: absolute;
}

.checkbox label:before{
  left: 0;
  top: 0;
  width: 18px;
  height: 18px;
  margin-right: 10px;
  background: #ddd;
  border-radius: 3px;
}

.checkbox label:after{
  content: '';
  position: absolute;
  top: 4px;
  left: 4px;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  background: #68b8c4;
  opacity: 0;
  pointer-events: none;
}

.checkbox input:checked ~ label:after{
  opacity: 1;
}

.checkbox input:focus ~ label:before{
  background: #eee;
}

/**
 * Container/Target Styles
 */

.container{
  padding: 2%;
  min-height: 400px;
  text-align: justify;
  position: relative;
}

.container .mix,
.container .gap{
  width: 100px;
  display: inline-block;
  margin: 0 5%;
}

.container .mix{
  width: 100px;
  height: 100px;
  margin: 5%;
  background: white;
  display: none;
}

.container .mix.green{
  background: #a6e6a7;
}

.container .mix.blue{
  background: #6bd2e8;
}

.container .mix.circle{
  border-radius: 999px;
}

.container .mix.triangle{
  width: 0;
  height: 0;
  border: 50px solid transparent;
  border-top-color: #68b8c4;
  border-left-color: #68b8c4;
}

.container .mix.sm{
  width: 50px;
  height: 50px;
}

/**
 * Fail message styles
 */

.container .fail-message{
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  
  -webkit-transition: 150ms;
  -moz-transition: 150ms;
  transition: 150ms;
}

.container .fail-message:before{
  content: '';
  display: inline-block;
  vertical-align: middle;
  height: 100%;
}

.container .fail-message span{
  display: inline-block;
  vertical-align: middle;
  font-size: 20px;
  font-weight: 700;
}

.container.fail .fail-message{
  opacity: 1;
  pointer-events: auto;
}

              
            
!

JS

              
                // To keep our code clean and modular, all custom functionality will be contained inside a single object literal called "multiFilter".

var multiFilter = {
  
  // Declare any variables we will need as properties of the object
  
  $filterGroups: null,
  $filterUi: null,
  $reset: null,
  groups: [],
  outputArray: [],
  outputString: '',
  
  // The "init" method will run on document ready and cache any jQuery objects we will need.
  
  init: function(){
    var self = this; // As a best practice, in each method we will asign "this" to the variable "self" so that it remains scope-agnostic. We will use it to refer to the parent "checkboxFilter" object so that we can share methods and properties between all parts of the object.
    
    self.$filterUi = $('#Filters');
    self.$filterGroups = $('.filter-group');
    self.$reset = $('#Reset');
    self.$container = $('#Container');
    
    self.$filterGroups.each(function(){
      self.groups.push({
        $inputs: $(this).find('input'),
        active: [],
		    tracker: false
      });
    });
    
    self.bindHandlers();
  },
  
  // The "bindHandlers" method will listen for whenever a form value changes. 
  
  bindHandlers: function(){
    var self = this,
        typingDelay = 300,
        typingTimeout = -1,
        resetTimer = function() {
          clearTimeout(typingTimeout);
          
          typingTimeout = setTimeout(function() {
            self.parseFilters();
          }, typingDelay);
        };
    
    self.$filterGroups
      .filter('.checkboxes')
    	.on('change', function() {
      	self.parseFilters();
    	});
    
    self.$filterGroups
      .filter('.search')
      .on('keyup change', resetTimer);
    
    self.$reset.on('click', function(e){
      e.preventDefault();
      self.$filterUi[0].reset();
      self.$filterUi.find('input[type="text"]').val('');
      self.parseFilters();
    });
  },
  
  // The parseFilters method checks which filters are active in each group:
  
  parseFilters: function(){
    var self = this;
 
    // loop through each filter group and add active filters to arrays
    
    for(var i = 0, group; group = self.groups[i]; i++){
      group.active = []; // reset arrays
      group.$inputs.each(function(){
        var searchTerm = '',
       			$input = $(this),
            minimumLength = 3;
        
        if ($input.is(':checked')) {
          group.active.push(this.value);
        }
        
        if ($input.is('[type="text"]') && this.value.length >= minimumLength) {
          searchTerm = this.value
            .trim()
            .toLowerCase()
            .replace(' ', '-');
          
          group.active[0] = '[class*="' + searchTerm + '"]'; 
        }
      });
	    group.active.length && (group.tracker = 0);
    }
    
    self.concatenate();
  },
  
  // The "concatenate" method will crawl through each group, concatenating filters as desired:
  
  concatenate: function(){
    var self = this,
		  cache = '',
		  crawled = false,
		  checkTrackers = function(){
        var done = 0;
        
        for(var i = 0, group; group = self.groups[i]; i++){
          (group.tracker === false) && done++;
        }

        return (done < self.groups.length);
      },
      crawl = function(){
        for(var i = 0, group; group = self.groups[i]; i++){
          group.active[group.tracker] && (cache += group.active[group.tracker]);

          if(i === self.groups.length - 1){
            self.outputArray.push(cache);
            cache = '';
            updateTrackers();
          }
        }
      },
      updateTrackers = function(){
        for(var i = self.groups.length - 1; i > -1; i--){
          var group = self.groups[i];

          if(group.active[group.tracker + 1]){
            group.tracker++; 
            break;
          } else if(i > 0){
            group.tracker && (group.tracker = 0);
          } else {
            crawled = true;
          }
        }
      };
    
    self.outputArray = []; // reset output array

	  do{
		  crawl();
	  }
	  while(!crawled && checkTrackers());

    self.outputString = self.outputArray.join();
    
    // If the output string is empty, show all rather than none:
    
    !self.outputString.length && (self.outputString = 'all'); 
    
    console.log(self.outputString); 
    
    // ^ we can check the console here to take a look at the filter string that is produced
    
    // Send the output string to MixItUp via the 'filter' method:
    
	  if(self.$container.mixItUp('isLoaded')){
    	self.$container.mixItUp('filter', self.outputString);
	  }
  }
};
  
// On document ready, initialise our code.

$(function(){
      
  // Initialize multiFilter code
      
  multiFilter.init();
      
  // Instantiate MixItUp
      
  $('#Container').mixItUp({
    controls: {
      enable: false // we won't be needing these
    },
    animation: {
      easing: 'cubic-bezier(0.86, 0, 0.07, 1)',
      queueLimit: 3,
      duration: 600
    }
  });    
});
              
            
!
999px

Console