<!DOCTYPE html>
<meta charset="utf-8">
<title>HTML Test: the HTMLFormControlsCollection interface</title>
<link rel="author" title="Intel" href="http://www.intel.com/">
<link rel="help" href="https://html.spec.whatwg.org/multipage/multipage/common-dom-interfaces.html#htmlformcontrolscollection">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<form id="f1">
  <input type="radio" id="r1">
  <keygen id="kg" name="key"></keygen>
</form>
<form id="f2">
  <table>
    <tr>
      <td>
        <input type="checkbox" id="cb">
        <input type="checkbox" name="cb">
      </td>
    </tr>
    <tr>
      <td>
        <button id="btn"></button>
        <button name="btn"></button>
      </td>
    </tr>
  </table>
</form>

<script>

var coll1, coll2, rdo;

setup(function () {
  rdo = document.getElementById("r1");
  coll1 = document.forms[0].elements;
  coll2 = document.forms[1].elements;
});

//length
test(function () {
  assert_equals(coll1.length, 2, "The length attribute is incorrect.");
  assert_equals(coll2.length, 4, "The length attribute is incorrect.");
}, "The length attribute must return the number of elements in the form");

//getter - index
test(function () {
  assert_equals(coll1.item(0), rdo, "HTMLFormControlsCollection.item(index) should return the 'input' element in radio status.");
}, "HTMLFormControlsCollection.item(index) must return the indexed item");

test(function () {
  assert_equals(coll1[0], rdo, "HTMLFormControlsCollection[index] should return the 'input' element in radio status.");
}, "HTMLFormControlsCollection[index] must return the indexed item");

//getter - name
test(function () {
  assert_throws(TypeError(), function() { coll1("r1") });
}, "HTMLFormControlsCollection is not callable");

test(function () {
  assert_equals(coll1["r1"], rdo, "HTMLFormControlsCollection[name] should return the 'input' element in radio status.");
}, "HTMLFormControlsCollection[name] must return the named item");

//getter - namedItem
test(function () {
  assert_equals(coll1.namedItem("r1"), rdo, "HTMLFormControlsCollection.namedItem(name) should return the 'input' element in radio status.");
}, "HTMLFormControlsCollection.namedItem(name) must return the named item");

test(function () {
  assert_true(coll1.namedItem("r1") instanceof Element, "Can not return 'Element' object.");
}, "The namedItem(name) must return an Element");

test(function () {
  assert_true(coll2.namedItem("cb") instanceof RadioNodeList, "Can not return 'RadioNodeList' object.");
}, "The namedItem(name) must return RadioNodeList");

test(function () {
  assert_equals(coll1.namedItem(""), null, "The return value of namedItem() should be null.");
}, "The namedItem(name) must return null if the name is empty");

test(function () {
  assert_equals(coll1.namedItem("test"), null, "The return value of namedItem() should be null.");
}, "The namedItem(name) must return null if there is no matched element");

test(function () {
  assert_equals(coll1.namedItem("kg"), document.getElementById("kg"), "Controls can be named by 'id' attribute.");
  assert_equals(coll1.namedItem("key"), document.getElementById("kg"), "Controls can be named by 'name' attribute.");
}, "Controls can be indexed by id or name attribute");

test(function () {
  assert_equals(coll2.namedItem("btn").length, 2, "The length attribute should be 2.");
}, "The namedItem(name) must return the items with id or name attribute");

//various controls in fieldset and form
var containers = ["form", "fieldset"],
    controls = ["button", "fieldset", "input", "keygen", "object", "output", "select", "textarea"];
for (var m = 0; m < containers.length; m++) {
  test(function () {
    var container = document.createElement(containers[m]);
    var len = controls.length;
    for (var n = 0; n < len; n++)
      container.appendChild(document.createElement(controls[n]));
    document.body.appendChild(container);
    assert_equals(container.elements.length, len, "The length should be " + len + ".");
  }, "The HTMLFormControlsCollection interface is used for collections of listed elements in " + containers[m] + " element");
}

//Check the controls' order
test(function () {
  var opt = document.forms[1].insertBefore(document.createElement("output"), document.forms[1].firstChild);
  assert_array_equals(document.forms[1].elements,
                      [opt, document.getElementsByTagName("input")[1], document.getElementsByTagName("input")[2],
                      document.getElementsByTagName("button")[0], document.getElementsByTagName("button")[1]]);
}, "The controls in the form element must be sorted in tree order");

</script>