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<!DOCTYPE html>
<meta charset="utf-8">
<title>Legacy platform objects</title>
<link rel="help" href="https://heycam.github.io/webidl/#es-legacy-platform-objects">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
function assert_prop_desc_equals(object, property_key, expected) {
let actual = Object.getOwnPropertyDescriptor(object, property_key);
if (expected === undefined) {
assert_equals(
actual, undefined,
"(assert_prop_desc_equals: no property descriptor expected)");
return;
}
for (p in actual) {
assert_true(
expected.hasOwnProperty(p),
"(assert_prop_desc_equals: property '" + p + "' is not expected)");
assert_equals(
actual[p], expected[p],
"(assert_prop_desc_equals: property '" + p + "')");
}
for (p in expected) {
assert_true(
actual.hasOwnProperty(p),
"(assert_prop_desc_equals: expected property '" + p + "' missing)");
}
}
// https://heycam.github.io/webidl/#legacy-platform-object-getownproperty
// https://heycam.github.io/webidl/#LegacyPlatformObjectGetOwnProperty
test(function() {
// DOMTokenList has an indexed property getter, no indexed property setter
// and no named property handlers.
let div = document.createElement("div");
div.classList.add("baz", "quux");
const domTokenList = div.classList;
assert_prop_desc_equals(
domTokenList, "1",
{value: "quux", writable: false, enumerable: true, configurable: true},
"[[GetOwnProperty]] for indexed properties returns the right descriptor");
assert_prop_desc_equals(
domTokenList, "42", undefined,
"[[GetOwnProperty]] with invalid index returns undefined");
assert_array_equals(Object.keys(domTokenList), ["0", "1"]);
assert_array_equals(Object.values(domTokenList), ["baz", "quux"]);
// getElementsByTagName() returns an HTMLCollection.
// HTMLCollection has indexed and named property getters, no setters. Its IDL
// interface declaration has [LegacyUnenumerableNamedProperties] so its named
// properties are not enumerable.
let span1 = document.createElement("span");
span1.id = "foo";
let span2 = document.createElement("span");
span2.id = "bar";
document.head.appendChild(span1);
document.head.appendChild(span2);
const elementList = document.getElementsByTagName("span");
assert_prop_desc_equals(
elementList, "foo",
{value: span1, writable: false, enumerable: false, configurable: true},
"[[GetOwnProperty]] for named properties returns the right descriptor");
assert_prop_desc_equals(
elementList, "1",
{value: span2, writable: false, enumerable: true, configurable: true},
"[[GetOwnProperty]] for indexed properties returns the right descriptor");
assert_prop_desc_equals(
elementList, "unknown", undefined,
"[[GetOwnProperty]] with invalid property name returns undefined");
assert_array_equals(Object.keys(elementList), ["0", "1"]);
assert_array_equals(Object.values(elementList), [span1, span2]);
}, "[[GetOwnProperty]] with getters and no setters");
test(function() {
// DOMStringMap supports named property getters and setters, but not indexed
// properties.
let span = document.createElement("span");
span.dataset.foo = "bar";
assert_prop_desc_equals(
span.dataset, "foo",
{value: "bar", writable: true, enumerable: true, configurable: true},
"[[GetOwnProperty]] for named properties returns the right descriptor");
assert_prop_desc_equals(
span.dataset, "unknown", undefined,
"[[GetOwnProperty]] with invalid property name returns undefined");
assert_array_equals(Object.keys(span.dataset), ["foo"]);
assert_array_equals(Object.values(span.dataset), ["bar"]);
}, "[[GetOwnProperty]] with named property getters and setters");
test(function() {
// HTMLSelectElement has indexed property getters and setters, but no support
// for named properties.
let selectElement = document.createElement("select");
assert_prop_desc_equals(
selectElement, "0", undefined,
"[[GetOwnProperty]] with invalid property index returns undefined");
let optionElement = document.createElement("option");
selectElement.appendChild(optionElement);
assert_prop_desc_equals(
selectElement, "0",
{value: optionElement, writable: true, enumerable: true, configurable: true},
"[[GetOwnProperty]] for indexed properties returns the right descriptor");
assert_array_equals(Object.keys(selectElement), ["0"]);
assert_array_equals(Object.values(selectElement), [optionElement]);
}, "[[GetOwnProperty]] with indexed property getters and setters");
// https://heycam.github.io/webidl/#legacy-platform-object-defineownproperty
// 3.9.3. [[DefineOwnProperty]]
test(function() {
let span = document.createElement("span");
span.className = "foo";
// DOMTokenList supports an indexed property getter but not a setter.
let domTokenList = span.classList;
// Confirm the test settings.
assert_equals(domTokenList.length, 1);
assert_prop_desc_equals(domTokenList, "0",
{value: "foo", writable: false, enumerable: true,
configurable: true});
assert_prop_desc_equals(domTokenList, "1", undefined);
// Actual test
assert_throws(new TypeError(), () =>
Object.defineProperty(domTokenList, "0", {value: true, writable: true}));
assert_throws(new TypeError(), () =>
Object.defineProperty(domTokenList, "1", {value: true, writable: true}));
assert_throws(new TypeError(), () =>
Object.defineProperty(domTokenList, "0", {get: () => {}}));
assert_throws(new TypeError(), () =>
Object.defineProperty(domTokenList, "0", {set: () => {}}));
assert_throws(new TypeError(), () =>
Object.defineProperty(domTokenList, "1", {get: () => {}}));
assert_throws(new TypeError(), () =>
Object.defineProperty(domTokenList, "1", {set: () => {}}));
assert_equals(domTokenList[0], "foo");
assert_equals(domTokenList[1], undefined);
domTokenList[0] = "bar";
domTokenList[1] = "bar";
assert_equals(domTokenList[0], "foo");
assert_equals(domTokenList[1], undefined);
assert_throws(new TypeError(), () => {
"use strict";
domTokenList[0] = "bar";
});
assert_throws(new TypeError(), () => {
"use strict";
domTokenList[1] = "bar";
});
// Nothing must change after all.
assert_equals(domTokenList.length, 1);
assert_prop_desc_equals(domTokenList, "0",
{value: "foo", writable: false, enumerable: true,
configurable: true});
assert_prop_desc_equals(domTokenList, "1", undefined);
}, "Test [[DefineOwnProperty]] with no indexed property setter support.");
test(function() {
// HTMLSelectElement supports an indexed property setter.
let select = document.createElement("select");
let option0 = document.createElement("option");
let option1 = document.createElement("option");
// Confirm the test settings.
assert_equals(select.length, 0);
assert_prop_desc_equals(select, "0", undefined);
// Try to define an accessor property with non supported property index.
assert_throws(new TypeError(), () =>
Object.defineProperty(select, "0", {get: () => {}}));
assert_throws(new TypeError(), () =>
Object.defineProperty(select, "0", {set: () => {}}));
assert_prop_desc_equals(select, "0", undefined);
// writable, enumerable, configurable will be ignored.
Object.defineProperty(select, "0", {value: option0, writable: false,
enumerable: false, configurable: false});
assert_prop_desc_equals(select, "0",
{value: option0, writable: true, enumerable: true,
configurable: true});
select[1] = option1;
assert_prop_desc_equals(select, "1",
{value: option1, writable: true, enumerable: true,
configurable: true});
// Try to define an accessor property with a supported property index.
assert_throws(new TypeError(), () =>
Object.defineProperty(select, "0", {get: () => {}}));
assert_throws(new TypeError(), () =>
Object.defineProperty(select, "0", {set: () => {}}));
assert_prop_desc_equals(select, "0",
{value: option0, writable: true, enumerable: true,
configurable: true});
}, "Test [[DefineOwnProperty]] with indexed property setter support.");
</script>
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