<!doctype html>
<html lang=en>
<meta charset=utf-8>
<title>XMLHttpRequest: Construct and upload FormData</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/semantics/forms/form-submission-0/resources/targetted-form.js"></script>
    <link rel="help" href="https://xhr.spec.whatwg.org/#interface-formdata" data-tested-assertations="following::P[1]" />
    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-formdata" data-tested-assertations=".. following::P[1]" />
    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-formdata-append" data-tested-assertations=".. following::UL[1]/LI[1] following::UL[1]/LI[2] following::UL[1]/LI[3]" />
    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-XMLHttpRequest-send-FormData" data-tested-assertations="following::DD[1]" />
<link rel="help" href="https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#constructing-the-form-data-set">

<div id="log"></div>
<form id="form">
  <input type="hidden" name="key" value="value">
</form>
<script>
  function do_test (name, fd, expected) {
    var test = async_test(name);
    test.step(function() {
      var client = new XMLHttpRequest();
      client.onreadystatechange = test.step_func(function () {
        if (client.readyState !== 4) return;
        assert_equals(client.responseText, expected);
        test.done();
      });
      client.open("POST", "resources/upload.py");
      client.send(fd);
    });
  }

  function create_formdata () {
    var fd = new FormData();
    for (var i = 0; i < arguments.length; i++) {
      fd.append.apply(fd, arguments[i]);
    };
    return fd;
  }

  test(() => {
    assert_throws_js(TypeError, () => { new FormData(null); });
    assert_throws_js(TypeError, () => { new FormData("string"); });
  }, "Constructors should throw a type error");

  do_test("empty formdata", new FormData(), '\n');
  do_test("formdata with string", create_formdata(['key', 'value']), 'key=value,\n');
  do_test("formdata with named string", create_formdata(['key', new Blob(['value'], {type: 'text/plain'}), 'kv.txt']), '\nkey=kv.txt:text/plain:5,');
  do_test("formdata from form", new FormData(document.getElementById('form')), 'key=value,\n');

  test(() => {
    let form = populateForm('<input name=n1 value=v1>');
    let formDataInEvent = null;
    form.addEventListener('formdata', e => {
      e.formData.append('h1', 'vh1');
      formDataInEvent = e.formData;
    });
    let formData = new FormData(form);
    assert_equals(formData.get('h1'), 'vh1');
    assert_equals(formData.get('n1'), 'v1');
    assert_not_equals(formData, formDataInEvent,
                      '"formData" attribute should be different from the ' +
                      'FromData object created by "new"');

    formDataInEvent.append('later-key', 'later-value');
    assert_false(formData.has('later-key'));
  }, 'Newly created FormData contains entries added to "formData" IDL ' +
     'attribute of FormDataEvent.');

  test(() => {
    let form = populateForm('<input name=n11 value=v11>');
    let counter = 0;
    form.addEventListener('formdata', e => {
      ++counter;
      assert_throws_dom('InvalidStateError', () => { new FormData(e.target) });
    });
    new FormData(form);
    assert_equals(counter, 1);

    form.submit();
    assert_equals(counter, 2);
  }, '|new FormData()| in formdata event handler should throw');
</script>