{% load staticfiles otree_tags %}

<input type="hidden" name="opened" value="0" id="id_opened"/>
{{form.opened.errors}}


<script type="text/javascript">
  var count = 0;
  var button = document.getElementById("instructionsButton");
  var opened = document.getElementById("id_opened");

  button.onclick = function(){
    count++;
    opened.value = count;
    console.log(opened)

  }
</script>