WTForms-Javascript: Pass Onclick To WTF Field

Is there a way to pass 'onclick' onto a WTForm field? I'd like to enable/disable a field depending on whether a WTF checkbox is selected. But the HTML from WTForms does not create

Solution 1:

You need to pass the extra arguments while rendering your form.

{% block content %}
{{ form.checkbox(onchange="doStuff()") }}
{{ form.required() }}
<script>
function doStuff(){
  var checked = document.getElementById('checkbox').checked
  if (checked){
    document.getElementById('required').disabled = true
  } else {
    document.getElementById('required').disabled = false
  }
}
doStuff()
</script>

{% endblock %}