javascript - trouble with showing content after it is hidden in jquery -


i doing programming challenge lynda.com (about jquery). asked make check boxes allow user hide products page selling sport/health products when unchecked , show them in list when checked again. catigories hide when uncheck check box, won't show again when check again. here jquery code first (i apologize not great indentation):

$("document").ready(function() {        var combo = $("input[name=vitamin]").add("input[name=proteinbar]").add("input[name=mineralwater]");        combo.on("change", function() {          var name = $(this).attr("name");          if (!$(this).checked) {            filterlist(name, $(this));          }          if ($(this).checked) {            unfilterlist(name, $(this));          }        });      });        function filterlist(name, selector) {        $(".product-item").each(function(index) {          if (($(this).children("h2").data("type") == name) && !selector.checked) {            $(this).hide();          }        });      }        function unfilterlist(name, selector) {        $(".product-item").each(function(index) {          if (($(this).children("h2").data("type") == name)) {            $(this).show();          }        });        return false;      }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <form >            show:</br>            <input type="checkbox" checked value="mineralwater" name="mineralwater" />mineral water <br>            <input type="checkbox" value="proteinbar" name="proteinbar" checked /> protein bars            <input type="checkbox" checked value="vitamins" name="vitamin" /> vitamins <br>        </form>        <ul class="product-list">          <li class="product-item" data-prod_id="v-a1037">              <img class="product-image" src="images/products/vitamin-a.jpg" alt="vitamin - product photo">              <h2 class="product-name" data-type="vitamin">vitamin a</h2>          </li>          <li class="product-item" data-prod_id="v-bc2178">              <img class="product-image" src="images/products/vitamin-bcomplex.jpg" alt="b complex - product photo">              <h2 class="product-name" data-type="vitamin">vitamin-b complex</h2>          </li>          <li class="product-item" data-prod_id="mw-8812">              <img class="product-image" src="images/products/mineralwater-blueberry.jpg" alt="blueberry mineral water - product photo">              <h2 class="product-name" data-type="mineralwater">blueberry mineral water</h2>          </li>

you should change $(this).checked this.checked or $(this).prop('checked'), think.


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