form-indexed-element.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/forms/the-form-element/form-indexed-element.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset="utf-8">

<title>form.elements: indexed</title>

<link rel="author" title="Ivan.Yang" href="mailto:jsyangwenjie@gmail.com">

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

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

<div id="log"></div>

<div id="test">

<form id=form>

<input type="radio" name="radio1" id="r1" value=1>

<input type="radio" name="radio2" id="r2" value=2>

</form>

</div>

<script>

test(function() {

  var form = document.getElementById("form");

  assert_equals(form[0], document.getElementById("r1"));

  assert_equals(form[1], document.getElementById("r2"));

  assert_equals(form[2], undefined);

  assert_equals(form[-1], undefined);

}, "form.elements should be accessed correctly by index")

test(function(){

  var form = document.getElementById("form");

  var old_item = form[0];

  var old_desc = Object.getOwnPropertyDescriptor(form, 0);

  assert_equals(old_desc.value, old_item);

  assert_true(old_desc.enumerable);

  assert_true(old_desc.configurable);

  assert_false(old_desc.writable);

  Object.prototype[0] = 5;

  this.add_cleanup(function () { delete Object.prototype[0]; });

  assert_equals(form[0], old_item);

  delete form[0];

  assert_equals(form[0], old_item);

  assert_throws_js(TypeError, function() {

    "use strict";

    delete form[0];

});

  assert_equals(form[0], old_item);

}, 'Trying to delete an indexed property name should never work');

</script>