jQuery Simple Example

HTML

<script src="//www.addressfinder.co.nz/assets/v2/widget.js"></script>
<div class="container">
  <button class="check">
check
</button>
  <div id="y">
    <div class="x">
      test1
    </div>
  </div>

  <div id="p">
    <div class="x">
      test2
    </div>
  </div>

  <div id="y">
    <div class="p">
      test3
    </div>
  </div>


  <div id="y">
    <div class="x">
      <p>
        asdsf
      </p>
    </div>
  </div>
</div>

JavaScript

$(document).ready(function() {
  $(".check").click(function() {
    $('[id=y]').each(function() {
      if ($(this).find(".x").length > 0) {
        alert($(this).text());
      }
    });
  });
});