| 1 | /** |
| 2 | * Copyright (c) Meta Platforms, Inc. and affiliates. |
| 3 | * |
| 4 | * This source code is licensed under the MIT license found in the |
| 5 | * LICENSE file in the root directory of this source tree. |
| 6 | * |
| 7 | * @emails react-core |
| 8 | */ |
| 9 | |
| 10 | 'use strict'; |
| 11 | |
| 12 | let React; |
| 13 | let ReactDOMClient; |
| 14 | let act; |
| 15 | |
| 16 | describe('SyntheticEvent', () => { |
| 17 | let container; |
| 18 | let root; |
| 19 | |
| 20 | beforeEach(() => { |
| 21 | React = require('react'); |
| 22 | ReactDOMClient = require('react-dom/client'); |
| 23 | act = require('internal-test-utils').act; |
| 24 | |
| 25 | container = document.createElement('div'); |
| 26 | root = ReactDOMClient.createRoot(container); |
| 27 | document.body.appendChild(container); |
| 28 | }); |
| 29 | |
| 30 | afterEach(() => { |
| 31 | document.body.removeChild(container); |
| 32 | container = null; |
| 33 | }); |
| 34 | |
| 35 | it('should be able to `preventDefault`', async () => { |
| 36 | let expectedCount = 0; |
| 37 | |
| 38 | const eventHandler = syntheticEvent => { |
| 39 | expect(syntheticEvent.isDefaultPrevented()).toBe(false); |
| 40 | syntheticEvent.preventDefault(); |
| 41 | expect(syntheticEvent.isDefaultPrevented()).toBe(true); |
| 42 | expect(syntheticEvent.defaultPrevented).toBe(true); |
| 43 | |
| 44 | expectedCount++; |
| 45 | }; |
| 46 | const nodeRef = React.createRef(); |
| 47 | await act(async () => { |
| 48 | root.render(<div onClick={eventHandler} ref={nodeRef} />); |
| 49 | }); |
| 50 | const node = nodeRef.current; |
| 51 | |
| 52 | const event = document.createEvent('Event'); |
| 53 | event.initEvent('click', true, true); |
| 54 | node.dispatchEvent(event); |
| 55 | |
| 56 | expect(expectedCount).toBe(1); |
| 57 | }); |
| 58 | |
| 59 | it('should be prevented if nativeEvent is prevented', async () => { |
| 60 | let expectedCount = 0; |
| 61 | |
| 62 | const eventHandler = syntheticEvent => { |
| 63 | expect(syntheticEvent.isDefaultPrevented()).toBe(true); |
| 64 | |
| 65 | expectedCount++; |
| 66 | }; |
| 67 | const nodeRef = React.createRef(); |
| 68 | await act(async () => { |
| 69 | root.render(<div onClick={eventHandler} ref={nodeRef} />); |
| 70 | }); |
| 71 | const node = nodeRef.current; |
| 72 | |
| 73 | let event; |
| 74 | event = document.createEvent('Event'); |
| 75 | event.initEvent('click', true, true); |
| 76 | event.preventDefault(); |
| 77 | node.dispatchEvent(event); |
| 78 | |
| 79 | event = document.createEvent('Event'); |
| 80 | event.initEvent('click', true, true); |
| 81 | // Emulate IE8 |
| 82 | Object.defineProperty(event, 'defaultPrevented', { |
| 83 | get() {}, |
| 84 | }); |
| 85 | Object.defineProperty(event, 'returnValue', { |
| 86 | get() { |
| 87 | return false; |
| 88 | }, |
| 89 | }); |
| 90 | node.dispatchEvent(event); |
| 91 | |
| 92 | expect(expectedCount).toBe(2); |
| 93 | }); |
| 94 | |
| 95 | it('should be able to `stopPropagation`', async () => { |
| 96 | let expectedCount = 0; |
| 97 | |
| 98 | const eventHandler = syntheticEvent => { |
| 99 | expect(syntheticEvent.isPropagationStopped()).toBe(false); |
| 100 | syntheticEvent.stopPropagation(); |
| 101 | expect(syntheticEvent.isPropagationStopped()).toBe(true); |
| 102 | |
| 103 | expectedCount++; |
| 104 | }; |
| 105 | const nodeRef = React.createRef(); |
| 106 | await act(async () => { |
| 107 | root.render(<div onClick={eventHandler} ref={nodeRef} />); |
| 108 | }); |
| 109 | const node = nodeRef.current; |
| 110 | |
| 111 | const event = document.createEvent('Event'); |
| 112 | event.initEvent('click', true, true); |
| 113 | node.dispatchEvent(event); |
| 114 | |
| 115 | expect(expectedCount).toBe(1); |
| 116 | }); |
| 117 | }); |