how can i run a function before open a materialize modal? code example

Example 1: open model using materialize open

$(".MyModal").openModal()

Example 2: materializecss.com modal

<!-- Modal Trigger -->
  <a class="waves-effect waves-light btn modal-trigger" href="#modal1">Modal</a>

  <!-- Modal Structure -->
  <div id="modal1" class="modal">
    <div class="modal-content">
      <h4>Modal Header</h4>
      <p>A bunch of text</p>
    </div>
    <div class="modal-footer">
      <a href="#!" class="modal-close waves-effect waves-green btn-flat">Agree</a>
    </div>
  </div>

Example 3: materialize open modal on load

<script>
 $(document).ready(function(){
    $('#modal').modal();
    $('#modal').modal('open'); 
 });
</script>