form-double-submit-preventdefault.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/forms/form-submission-0/form-double-submit-preventdefault.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<link rel="help" href="https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#form-submission-algorithm">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="./resources/targetted-form.js"></script>

<!--

  The submit() in event handler should *not* get superseded in this case by the

  default action submit(), because event handler here calls preventDefault().

-->

<body>

<script>

promise_test(async () => {

  let form = populateForm('<input name=n1 value=v1><input type=submit>');

  let iframe = form.previousSibling;

  let input = form.querySelector("input[name=n1]");

  let submitter = form.querySelector("input[type=submit]");

  form.addEventListener('click', () => {

    input.value = 'v2';

    form.submit();

    input.value = 'v3';

    form.submit();

    input.value = 'v4';

});

  form.addEventListener('submit', (e) => {

    e.preventDefault();

    input.value = 'v5';

    form.submit();

    input.value = 'v6';

    form.submit();

    input.value = 'v7';

});

  submitter.click();

  await loadPromise(iframe);

  assert_equals(getParamValue(iframe, "n1"), "v6");

}, 'PreventDefaulting form onsubmit should allow submit() to succeed');

promise_test(async () => {

  let form = populateForm('<input type=submit><input name=n1 value=v1>');

  let iframe = form.previousSibling;

  let input = form['n1'];

  let submitter = form.querySelector('input[type=submit]');

  form.addEventListener('submit', e => {

    e.preventDefault();

    input.value = 'v2';

    form.submit();

    input.value = 'v3';

    form.remove();

    form.submit();

    document.body.insertBefore(form, iframe.nextSibling);

    input.value = 'v4';

});

  submitter.click();

  await loadPromise(iframe);

  assert_equals(getParamValue(iframe, "n1"), "v2");

}, 'PreventDefaulting form onsubmit should allow submit() to succeed and the second submit() which is invalid should not supersede first one');

</script>

</body>