JAVASCRIPT

data-item-id

// Here's our buttonvar button = document.getElementById('your-button-id'); // Get the valuesvar cmd = button.getAttribute('data-cmd');var id = button.getAttribute('data-id'); // Change the valuesbutton.setAttribute('data-cmd', yourNewCmd);button.setAttribute('data-id', yourNewId);

element data-id

<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>

<ul id="list" class="grid">
  <li data-id="id-40" class="win">
    <a id="ctl00_cphBody_ListView1_ctrl0_SelectButton" class="project" href="#">
      <img src="themes/clean/images/win.jpg" class="project-image" alt="get data-id" />
    </a>
  </li>
</ul>
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