Trying to filter JSON contents by checkbox – Twitter bootstrap

// Filter data with checkboxes
$('#submitFilter').click(function() {
  var filters = [];
  $('.filters').find(':checked').each(function() {
    filters.push($(this).val());
  });

  var globalFilterVariable = '';
  var categoryImage = '';

  $.each(product_data, function(i, item) {
    // Figure out what you want to do with the rest of the filters.
    globalFilterVariable = item[filters[0]]; 
   
    // Convert JSON strings to uppercase for comparison
    var brandLetter = item.itemBrandLetter.toUpperCase();
    var foodService = item.itemDeli.toUpperCase();

    if (['N', 'n', ''].indexOf(globalFilterVariable) === -1
          && brandLetter == "C" && foodService == "N") {
      categoryImage += '<div class="col-lg-3 col-md-4 col-sm-6 col-xs-12">'
        + '<a href="#"' + 'class="showProduct" '
          + 'data-itemcategory="' + item.itemCategory + '" '
          + 'data-itempageurl="' + item.itemFullUPC + '" '
          + 'data-itemgmo="' + item.itemGMOFree + '" '
          + 'data-itembpa="'+ item.itemBPAFree + '" '
          + 'data-itemgluten="' + item.itemGlutenFree + '" '
          + 'data-itemlowsodium="' + item.itemLowSodium + '" '
          + 'data-itemkosher="' + item.itemKosherSym + '" '
          + 'data-itemorganic="' + item.itemOrganic + '" '
          + 'data-itemimage="' + item.imageURL + '" '
          + 'data-itemname="' + item.itemName + '" '
          + 'data-itemoz="' + item.itemPackSize + '" '
          + 'data-itemdescription="' + item.itemDescription + '" '
          + 'data-itemupc="' + item.itemFullUPC + '">'
        + '<img class="img-responsive img-hover productImagesCategory" src="' + item.imageURL + '">'
        + '<h3>' + item.itemName + '</h3>'
      + '</a>'
      + '</div>';
      console.log(globalFilterVariable);
    }
  });
  $('#imagesCategoryProducts').hide().html(categoryImage).fadeIn('slow');
  closeNav();
});

<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap-theme.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
<form>
  <div class="checkbox">
    <label><input type="checkbox" class="filters"
                  name="filter-gulten" value="itemGlutenFree">Gluten Free</label>
  </div>
  <div class="checkbox">
    <label><input type="checkbox" class="filters"
                  name="filter-non-gmo" value="itemGMOFree">Non-GMO</label>
  </div>
  <div class="checkbox">
    <label><input type="checkbox" class="filters"
                  name="filter-organic" value="itemOrganic">Organic</label>
  </div>
  <div class="checkbox">
    <label><input type="checkbox" class="filters"
                  name="filter-low-sodium" value="itemLowSodium">Low Sodium</label>
  </div>
  <div class="checkbox">
    <label><input type="checkbox" class="filters"
                  name="filter-bpa-free" value="itemBPAFree">BPA Free</label>
  </div>
  <div class="checkbox">
    <label><input type="checkbox" class="filters"
                  name="filter-kosher"  value="itemKosherSym">Kosher</label>
  </div>
  <button type="button" id="submitFilter" class="btn btn-primary">Submit</button>
  <button type="button" id="clearFilter" class="btn btn-primary">Clear</button>
</form>

var sampleItems = [{
  name : "All",
  gmoFree : 'Y',
  bpaFree : 'Y',
  glutenFree : 'Y',
  lowSodium : 'Y',
  kosherSym : 'Y',
  organic : 'Y'
}, {
  name : "None",
  gmoFree : 'N',
  bpaFree : 'N',
  glutenFree : 'N',
  lowSodium : 'N',
  kosherSym : 'N',
  organic : 'N'
}, {
  name : "GMO and Gluten Free",
  gmoFree : 'Y',
  bpaFree : 'N',
  glutenFree : 'Y',
  lowSodium : 'N',
  kosherSym : 'N',
  organic : 'N'
}];

$('#submitFilter').click(function() {
  var availableFilters = [];
  var activeFilters = [];
  var $filters = $('.filters').each(function() {
    var value = $(this).val();
    availableFilters.push(value);
    if ($(this).is(':checked')) {
      activeFilters.push(value);
    }
  });
  var filteredItems = sampleItems.filter(function(item) {
    return availableFilters.every(function(filter) {
      if (activeFilters.indexOf(filter) > -1) {
        return item[filter] === 'Y';
      }
      return true;
    });
  });
  var $list = $('#list').empty();
  $.each(filteredItems, function(index, item) {
    $list.append($('<LI>').text(JSON.stringify(item)));
  });
});

<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap-theme.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
<form>
  <div class="checkbox">
    <label><input type="checkbox" class="filters"
                  name="filter-gulten" value="glutenFree">Gluten Free</label>
  </div>
  <div class="checkbox">
    <label><input type="checkbox" class="filters"
                  name="filter-non-gmo" value="gmoFree">Non-GMO</label>
  </div>
  <div class="checkbox">
    <label><input type="checkbox" class="filters"
                  name="filter-organic" value="organic">Organic</label>
  </div>
  <div class="checkbox">
    <label><input type="checkbox" class="filters"
                  name="filter-low-sodium" value="lowSodium">Low Sodium</label>
  </div>
  <div class="checkbox">
    <label><input type="checkbox" class="filters"
                  name="filter-bpa-free" value="bpaFree">BPA Free</label>
  </div>
  <div class="checkbox">
    <label><input type="checkbox" class="filters"
                  name="filter-kosher"  value="kosherSym">Kosher</label>
  </div>
  <button type="button" id="submitFilter" class="btn btn-primary">Submit</button>
  <button type="button" id="clearFilter" class="btn btn-primary">Clear</button>
</form>
<h2>Results</h2>
<ul id="list"></ul>