how to show navbar collapse JS code example

Example 1: on button click show collapse div jquery

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button id="button">Toggle Expand/Collapse</button>
<div id="wrapper">
  <ul id="list">
    <li>Item</li>
    <li>Item</li>
    <li>Item</li>
    <li>Item</li>
  </ul>
</div>

Example 2: on button click show collapse div jquery

#wrapper {
  background: #ccc;
  overflow: hidden;
  transition: max-height 300ms;
  max-height: 0; /* <---hide by default */
}
#wrapper.open {
  max-height: 100px; /* <---when open, allow content to expand to take up as much height as it needs, up to e.g. 100px */
}

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