mirror of https://github.com/nodejs/node.git
66 lines
1.9 KiB
JavaScript
66 lines
1.9 KiB
JavaScript
'use strict';
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const common = require('../common');
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// Manually converted from https://github.com/web-platform-tests/wpt/blob/master/dom/events/AddEventListenerOptions-passive.html
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// in order to define the `document` ourselves
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const {
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fail,
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ok,
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strictEqual
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} = require('assert');
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{
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const document = new EventTarget();
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let supportsPassive = false;
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const query_options = {
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get passive() {
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supportsPassive = true;
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return false;
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},
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get dummy() {
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fail('dummy value getter invoked');
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return false;
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}
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};
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document.addEventListener('test_event', null, query_options);
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ok(supportsPassive);
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supportsPassive = false;
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document.removeEventListener('test_event', null, query_options);
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strictEqual(supportsPassive, false);
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}
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{
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function testPassiveValue(optionsValue, expectedDefaultPrevented) {
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const document = new EventTarget();
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let defaultPrevented;
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function handler(e) {
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if (e.defaultPrevented) {
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fail('Event prematurely marked defaultPrevented');
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}
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e.preventDefault();
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defaultPrevented = e.defaultPrevented;
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}
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document.addEventListener('test', handler, optionsValue);
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// TODO the WHATWG test is more extensive here and tests dispatching on
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// document.body, if we ever support getParent we should amend this
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const ev = new Event('test', { bubbles: true, cancelable: true });
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const uncanceled = document.dispatchEvent(ev);
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strictEqual(defaultPrevented, expectedDefaultPrevented);
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strictEqual(uncanceled, !expectedDefaultPrevented);
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document.removeEventListener('test', handler, optionsValue);
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}
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testPassiveValue(undefined, true);
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testPassiveValue({}, true);
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testPassiveValue({ passive: false }, true);
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common.skip('TODO: passive listeners is still broken');
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testPassiveValue({ passive: 1 }, false);
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testPassiveValue({ passive: true }, false);
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testPassiveValue({ passive: 0 }, true);
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}
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