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I have a very simple JS code that only does one thing, which is to toggle an open class on a specific element on the page. The problem is, I have 4 duplicate .clickSlide elements and .sub_menu elements, and when I click on one of them to trigger the tag, all the elements get open kind. Only one of the focused elements should get the open class.

My best guess is that something this is missing in the JS. But I'm open to solutions to this problem!

jQuery(document).ready(function($) {
  $(".clickSlide").click(function() {
    $(".sub_menu").toggleClass("open");
  });
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="ht_course_one">
  <ul class="select-menu dropdown">
    <li class="clickSlide">
      <ul class="sub_menu">
        <li></li>
      </ul>
    </li>
  </ul>
</div>

<div class="ht_course_two">
  <ul class="select-menu">
    <li class="clickSlide">
      <ul class="sub_menu">
        <li></li>
      </ul>
    </li>
  </ul>
</div>

<div class="ht_course_three">
  <ul class="select-menu">
    <li class="clickSlide">
      <ul class="sub_menu">
        <li></li>
      </ul>
    </li>
  </ul>
</div>

<div class="ht_course_four">
  <ul class="select-menu">
    <li class="clickSlide">
      <ul class="sub_menu">
        <li></li>
      </ul>
    </li>
  </ul>
</div>