Handle button click from event listener

  <script>
    document.addEventListener("DOMContentLoaded", function(event) {
      document.getElementById('MyButtonId').addEventListener('click', function()
      {
        window.location = "/some_page";
      });
    });
  </script>

Handle button click using onclick

  <script>
    <div class="MyButtonClass" title="Does this..." onclick="MyFunctionName(1234,'abc');" ></div>
  </script>