Bootstrap Modal with WTF

Question

I got several user input fields inside Bootstrap Modal and I'm trying to do some validation before users can submit it.

I've looked around several related articles and nothing has worked for me so far.

So the main problem that I'm having is that, everytime I press submit, the modal window closes so that users cannot see the error messages. I want the modal window to stay open until a successful submission occurs.

Below is my modal

Click to copy

<button type="button" class="btn btn-default" data-toggle="modal" data-target="#editModal" style="float:right">
  <span class="glyphicon glyphicon-edit"></span> Edit
</button>

<!-- Modal -->
<div class="modal fade" id="editModal" role="dialog" >
  <div class="modal-dialog">

    <!-- Modal content-->
    <div class="modal-content" >
      <div class="modal-header" >
        <button type="button" class="close" data-dismiss="modal">&times;</button>
        <h4>Edit Your Login Information</h4>
      </div>

      <div class="modal-body">
        <form action="{{ url_for('.profile') }}" method='post' name='edit_user' class="form-horizontal" >
          {{ user_edit_form.csrf_token }}
          <div class="form-group col-xs-12 col-md-12 col-lg-12" style="background-color:white; !important ">
            <div class="col-xs-12 col-md-12 col-lg-12" >
              {{ render_field(user_edit_form.first_name) }}
            </div>
            <div class="col-xs-12 col-md-12 col-lg-12">
              {{ render_field(user_edit_form.last_name) }}
            </div>
            <div class="col-xs-12 col-md-12 col-lg-12">
              {{ render_field(user_edit_form.email) }}
            </div>
            <div class="col-xs-12 col-md-12 col-lg-12">
              {{ render_field(user_edit_form.institute) }}
            </div>
            <div class="col-xs-12 col-md-12 col-lg-12">
              <input class='btn btn-primary' id='uform' type='submit' value='UPDATE' style="float:right"/>
            </div>
          </div>
        </form>
      </div>
    </div>
  </div>
</div>

and the javascript that I'm trying to get it to work

Click to copy

<script>
  var formErrors = {% if user_edit_form.errors %}true{% else %}false{% endif %};
  $(document).ready(function() {
    if (formErrors) {
      $('.Modal').modal('show');
    }
  });
</script>

Any help will be really appreciated!!

Answer 1

First you need to prevent the default action of your submit button which would be to send a post request and close your modal form. You can do this in the click event of the submit button by using event.preventDefault(). Next you would serialize your form data and send the post request via Ajax. If the view function returns "ok" you hide the dialog and reload your current page. Otherwise you will display the hml code with the error messages. Take the following steps:

1. Give your form an id:

Click to copy

<form id="editForm" action="{{ url_for('.profile') }}" method="post" name="edit_user" class="form-horizontal">

2. Add Javascript code (needs jQuery)

Click to copy

$('#uform').click(function(event) {
  event.preventDefault();
  $.post(url, data=$('#editForm').serialize(), function(data) {
    if (data.status == 'ok') {
      $('#editModal').modal('hide');
      location.reload();
    }
    else {
      $('#editModal .modal-content').html(data);
    }
  });
})

3. Modify your view function

Click to copy

@main.route('/yourroute', methods=['GET', 'POST'])
def profile():
    form = YourForm()
    if form.validate_on_submit():
        user = UserEditForm()
        user.first_name = form.first_name.data
        user.last_name = form.last_name.data
        # ...
        db.session.add(user)
        db.session.commit()
        return jsonify(status='ok')
    return render_template('yourtemplate.html', form=form)