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| 1 <!DOCTYPE html> |
| 2 <title>Custom Elements: CustomElementsRegistry.whenDefined</title> |
| 3 <script src="../../../resources/testharness.js"></script> |
| 4 <script src="../../../resources/testharnessreport.js"></script> |
| 5 <body> |
| 6 <div id="log"></div> |
| 7 <script> |
| 8 'use strict'; |
| 9 (() => { |
| 10 // https://html.spec.whatwg.org/multipage/scripting.html#dom-customelementsreg
istry-whendefined |
| 11 // Use window from iframe to isolate the test. |
| 12 function setup() { |
| 13 const iframe = document.createElement('iframe'); |
| 14 document.body.appendChild(iframe); |
| 15 const testWindow = iframe.contentWindow; |
| 16 const customElements = testWindow.customElements; |
| 17 if (!customElements) |
| 18 return Promise.reject('This test requires window.customElements'); |
| 19 if (!('whenDefined' in customElements)) |
| 20 return Promise.reject('This test requires window.customElements.whenDefine
d'); |
| 21 return Promise.resolve(customElements); |
| 22 } |
| 23 |
| 24 const kNameToBeDefined = 'x-foo'; |
| 25 const kNameNotDefined = 'x-bar'; |
| 26 let beforeDefined = false; |
| 27 let notDefined = true; |
| 28 let afterDefined = false; |
| 29 promise_test(() => setup() |
| 30 .then(customElements => { |
| 31 // 4. If map does not contain an entry with key name, create an entry in |
| 32 // map with key name and whose value is a new promise. |
| 33 const promiseBeforeDefined = customElements.whenDefined(kNameToBeDefined); |
| 34 promiseBeforeDefined.then(() => beforeDefined = true); |
| 35 // 5. Let promise be the value of the entry in map with key name. |
| 36 // 6. Return promise |
| 37 assert_equals(promiseBeforeDefined, |
| 38 customElements.whenDefined(kNameToBeDefined), |
| 39 'There is only one promise defined before.'); |
| 40 const promiseNotDefined = customElements.whenDefined(kNameNotDefined); |
| 41 promiseNotDefined.then(() => notDefined = false); |
| 42 assert_not_equals(promiseBeforeDefined, promiseNotDefined, |
| 43 'whenDefined() returns different promises for different names.'); |
| 44 customElements.define(kNameToBeDefined, class {}); |
| 45 // 3. If this CustomElementsRegistry contains an entry with name name, |
| 46 // then return a new promise resolved with undefined and abort these |
| 47 // steps. |
| 48 const promiseAfterDefined = customElements.whenDefined(kNameToBeDefined); |
| 49 promiseAfterDefined.then(() => afterDefined = true); |
| 50 assert_not_equals(promiseBeforeDefined, promiseAfterDefined, |
| 51 'When name is defined, we should have a new promise.'); |
| 52 assert_not_equals(promiseAfterDefined, |
| 53 customElements.whenDefined(kNameToBeDefined), |
| 54 'Once name is defined, whenDefined() always returns a new promise.'); |
| 55 return customElements; |
| 56 }).then(customElements => { |
| 57 assert_true(beforeDefined, 'promise before defined should be resolved.'); |
| 58 assert_true(afterDefined, 'promise after defined should be resolved.'); |
| 59 assert_true(notDefined, 'promise for not defined name should not be resolv
ed.'); |
| 60 }).catch(reason => { throw reason })); |
| 61 })(); |
| 62 </script> |
| 63 </body> |
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Chromium Code Reviews
Issue 2048343002:
Introduce CustomElementRegistry#whenDefined() method (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master