Issue with Mockjax: asynchronous form submissions are not being intercepted

Currently, I am facing an issue while using qUnit and mockjax to handle a basic async form submission. It seems like the async POST request is passing through mockjax for some reason.

test 'RuleModal closes the modal on a successful form submission event', ->
  $.mockjax
    dataType: 'json'
    url: '/url'
    type: 'post'
    responseText:
      status: 'success'

  $dom = $('<div class="show-modal"><form action="/url" method="post"></form></div>')
  $form = $dom.find('form')
  modal = new RuleModal($dom)

  $form.submit()

  equal $($dom).hasClass('show-modal'), false, 'closes the modal after form submission'

In addition to this, here is the implementation:

_bindSubmit: ->
  modal = this

  @$modal.find('form').on 'submit', (event) ->
    event.preventDefault()

    $.ajax
      dataType: 'json'
      url: @action
      type: @method
      data: $(this).serialize()
      success: (data, status, xhr) ->
        modal.close()
      error: (xhr, status, error) ->
        alert 'Something went wrong: ' + error

Despite trying to hardcode the implementation to match the test exactly, it still doesn't seem to work. Can you help me figure out what I might be doing incorrectly?

javascriptajaxtestingqunitmockjax

Answer №1

It appears that the issue arises from the sequence of events in your code. After submitting the form, you immediately perform an assertion which may lead to a race condition. The $form.submit() call is likely still processing when the equal ... line is executed. Despite mocking out the ajax call, its asynchronous nature can cause discrepancies. Regrettably, browser native events such as submit lack a callback mechanism upon completion, necessitating a setTimeout() around the assertion:

$form.submit();

setTimeout(function() {
    equal($($dom).hasClass('show-modal'), false, 'closes the modal after form submission');
}, 100);  // Possibly 50ms by default in Mockjax

An alternative approach could involve implementing this within an event handler, although this might also introduce a potential race condition.

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