How to use getEventListenerSet method in Playwright Internal

Best JavaScript code snippet using playwright-internal

SelectEventPlugin.js

Source: SelectEventPlugin.js Github

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...141 eventSystemFlags ,142 targetContainer ,143) {144 if (!enableEagerRootListeners) {145 const eventListenerSet = getEventListenerSet(targetContainer);146 /​/​ Track whether all listeners exists for this plugin. If none exist, we do147 /​/​ not extract events. See #3639.148 if (149 /​/​ If we are handling selectionchange, then we don't need to150 /​/​ check for the other dependencies, as selectionchange is only151 /​/​ event attached from the onChange plugin and we don't expose an152 /​/​ onSelectionChange event from React.153 domEventName !== 'selectionchange' &&154 !eventListenerSet.has('onSelect') &&155 !eventListenerSet.has('onSelectCapture')156 ) {157 return;158 }159 }...

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DOMPluginEvnentSystem.js

Source: DOMPluginEvnentSystem.js Github

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...29 rootContainerElement,30 eventSystemFlags = 0 /​/​ 事件系统标识31) {32 /​/​ 同一个容器上的同一个阶段的同一个事件只绑定一次33 let listenerSet = getEventListenerSet(rootContainerElement)34 let listenerSetKey = getListenerSetKey(domEventName, isCapturePhaseListener)35 if (!listenerSet.has(listenerSetKey)) { 36 /​/​ 如果没有绑定过,就添加上这个key37 if (isCapturePhaseListener) {38 eventSystemFlags |= IS_CAPTURE_PHASE /​/​ let a = 1; a+=239 }40 addTrappedEventListener(41 rootContainerElement,42 domEventName,43 eventSystemFlags,44 isCapturePhaseListener45 )46 listenerSet.add(listenerSetKey)47 }...

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DOMPluginEventSystem.js

Source: DOMPluginEventSystem.js Github

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...117 }118 eventSystemFlags |= IS_NON_DELEGATED;119 target = targetElement;120 }121 const listenerSet = getEventListenerSet(target);122 const listenerSetKey = getListenerSetKey(123 domEventName,124 isCapturePhaseListener125 );126 if (!listenerSet.has(listenerSetKey)) {127 if (isCapturePhaseListener) {128 eventSystemFlags |= IS_CAPTURE_PHASE;129 }130 addTrappedEventListener(131 target,132 domEventName,133 eventSystemFlags,134 isCapturePhaseListener135 );136 listenerSet.add(listenerSetKey);137 }138};139const listenToAllSupportedEvents = (rootContainerElement) => {140 if (rootContainerElement[listeningMarker]) return;141 rootContainerElement[listeningMarker] = true;142 allNativeEvents.forEach((domEventName) => {143 if (!nonDelegatedEvents.has(domEventName)) {144 listenToNativeEvent(domEventName, false, rootContainerElement, null);145 }146 listenToNativeEvent(domEventName, true, rootContainerElement, null);147 });148};149const listenToNonDelegatedEvent = (domEventName, targetElement) => {150 const isCapturePhaseListener = false;151 const listenerSet = getEventListenerSet(targetElement);152 const listenerSetKey = getListenerSetKey(153 domEventName,154 isCapturePhaseListener155 );156 if (!listenerSet.has(listenerSetKey)) {157 addTrappedEventListener(158 targetElement,159 domEventName,160 IS_NON_DELEGATED,161 isCapturePhaseListener162 );163 listenerSet.add(listenerSetKey);164 }165};...

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ReactDOMComponentTree.js

Source: ReactDOMComponentTree.js Github

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...9/​/​ 从真实DOM节点找到属性对象10export function getFiberCurrentPropsFromNode(targetNode) {11 return targetNode[internalPropsKey]12}13export function getEventListenerSet(node) {14 /​/​ 给Dom元素上放一个set集合用来存放监听的事件15 let elementListenerSet = node[internalEventHandlersKey]16 if (!elementListenerSet) {17 elementListenerSet = node[internalEventHandlersKey] = new Set()18 }19 return elementListenerSet...

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Using AI Code Generation

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1const playwright = require('playwright');2(async () => {3 const browser = await playwright.chromium.launch({headless: false});4 const page = await browser.newPage();5 const listenerSet = page.getEventListenerSet();6 console.log(listenerSet);7 await browser.close();8})();9Set(0) {}10const playwright = require('playwright');11(async () => {12 const browser = await playwright.chromium.launch({headless: false});13 const page = await browser.newPage();14 page.on('popup', () => console.log('popup event'));15 const listenerSet = page.getEventListenerSet();16 console.log(listenerSet);17 await browser.close();18})();19Set(1) { [Function (anonymous)] }

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Using AI Code Generation

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1const { getEventListenerSet } = require('playwright/​lib/​server/​chromium/​crPage');2const { chromium } = require('playwright');3(async () => {4 const browser = await chromium.launch();5 const context = await browser.newContext();6 const page = await context.newPage();7 const eventListenerSet = getEventListenerSet(page);8 console.log(eventListenerSet);9 await browser.close();10})();11Set {

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Using AI Code Generation

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1const { getEventListenerSet } = require('playwright/​lib/​internal/​frames');2const { chromium } = require('playwright');3(async () => {4 const browser = await chromium.launch();5 const context = await browser.newContext();6 const page = await context.newPage();7 const eventListenerSet = getEventListenerSet(page);8 console.log(eventListenerSet);9 await browser.close();10})();11Set(2) {12 {13 },14 {15 }16}

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Using AI Code Generation

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1const { getEventListenerSet } = require('playwright/​lib/​server/​events');2const { chromium } = require('playwright');3(async () => {4 const browser = await chromium.launch({ headless: false });5 const page = await browser.newPage();6 const eventListenerSet = getEventListenerSet(page);7 eventListenerSet.on('pageevent', (event) => {8 console.log(event);9 });10})();11{ type: 'pageevent',12 event: { name: 'load', timestamp: 1594375190.290 },13 pageId: 'page-1' }14{ type: 'pageevent',15 event: { name: 'domcontentloaded', timestamp: 1594375190.290 },16 pageId: 'page-1' }17{ type: 'pageevent',18 event: { name: 'networkidle', timestamp: 1594375190.290 },19 pageId: 'page-1' }20{ type: 'pageevent',21 event: { name: 'load', timestamp: 1594375190.290 },22 pageId: 'page-1' }23{ type: 'pageevent',24 event: { name: 'domcontentloaded', timestamp: 1594375190.290 },25 pageId: 'page-1' }26{ type: 'pageevent',27 event: { name: 'networkidle', timestamp: 1594375190.290 },28 pageId: 'page-1' }29{ type: 'pageevent',30 event: { name: 'load', timestamp: 1594375190.290 },31 pageId: 'page-1' }32{ type: 'pageevent',33 event: { name: 'domcontentloaded', timestamp: 1594375190.290 },34 pageId: 'page-1' }35{ type: 'pageevent',36 event: { name: 'networkidle', timestamp: 1594375190.290 },37 pageId: 'page-1' }38{ type: 'pageevent',39 event: { name: 'load', timestamp: 1594375190.290 },40 pageId: 'page-1' }41{ type: 'pageevent',

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Using AI Code Generation

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1const { getEventListenerSet } = require('playwright/​lib/​server/​supplements/​recorder/​recorderApp');2const { chromium } = require('playwright');3(async () => {4 const browser = await chromium.launch();5 const context = await browser.newContext();6 const page = await context.newPage();7 await page.click('text=Example Domain');8 await page.click('text=More information...');9 const eventListenerSet = getEventListenerSet(page);10 console.log(eventListenerSet);11 await browser.close();12})();13Set(2) {14 { type: 'click', handler: [Function: clickHandler] },15 {16 options: { capture: true }17 }18}19const { getEventListeners } = require('playwright/​lib/​server/​supplements/​recorder/​recorderApp');20const { chromium } = require('playwright');21(async () => {22 const browser = await chromium.launch();23 const context = await browser.newContext();24 const page = await context.newPage();25 await page.click('text=Example Domain');26 await page.click('text=More information...');27 const eventListeners = getEventListeners(page, 'click');28 console.log(eventListeners);29 await browser.close();30})();31 { type: 'click', handler: [Function: clickHandler] },32 {33 options: { capture: true }34 }

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Using AI Code Generation

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1const { getEventListenerSet } = require('playwright/​lib/​server/​events');2const events = getEventListenerSet();3console.log(events);4const { getEventListeners } = require('playwright/​lib/​server/​events');5const events = getEventListeners();6console.log(events);7const { getEventListeners } = require('playwright/​lib/​server/​events');8const events = getEventListeners();9console.log(events);10const { getEventListeners } = require('playwright/​lib/​server/​events');11const events = getEventListeners();12console.log(events);13const { getEventListeners } = require('playwright/​lib/​server/​events');14const events = getEventListeners();15console.log(events);16const { getEventListeners } = require('playwright/​lib/​server/​events');17const events = getEventListeners();18console.log(events);19const { getEventListeners } = require('playwright/​lib/​server/​events');20const events = getEventListeners();21console.log(events);22const { getEventListeners } = require('playwright/​lib/​server/​events');23const events = getEventListeners();24console.log(events);25const { getEventListeners } = require('playwright/​lib/​server/​events');26const events = getEventListeners();27console.log(events);28const { getEventListeners } = require('playwright/​lib/​server/​events');29const events = getEventListeners();30console.log(events);31const { getEventListeners } = require('playwright/​lib/​server/​events');32const events = getEventListeners();33console.log(events);34const { getEventListeners } = require('playwright/​lib/​server/​events');35const events = getEventListeners();36console.log(events);37const { getEventListeners } = require('playwright/​lib/​server/​events');

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Using AI Code Generation

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1const { getEventListenerSet } = require("playwright/​lib/​helper");2const { chromium } = require("playwright");3(async () => {4const browser = await chromium.launch({ headless: false });5const context = await browser.newContext();6const page = await context.newPage();7const listener = () => {};8page.on("load", listener);9const listenerSet = getEventListenerSet(page);10console.log(listenerSet);11await page.close();12await context.close();13await browser.close();14})();15Set { { listener: [Function: listener], eventName: 'load' } }16const { getEventListenerSet } = require("playwright/​lib/​helper");17const { chromium } = require("playwright");18(async () => {19const browser = await chromium.launch({ headless: false });20const context = await browser.newContext();21const page = await context.newPage();22const listener = () => {};23page.on("load", listener);24const listenerSet = getEventListenerSet(page);25console.log(listenerSet);26await page.close();27await context.close();28await browser.close();29})();30Set { { listener: [Function: listener], eventName: 'load' } }31const { getEventListenerSet } = require("playwright/​lib/​helper");32const { chromium } = require("playwright");33(async () => {34const browser = await chromium.launch({ headless: false });35const context = await browser.newContext();36const page = await context.newPage();37const listener = () => {};38page.on("load", listener);39const listenerSet = getEventListenerSet(page);40console.log(listenerSet);41await page.close();42await context.close();43await browser.close();44})();45Set { { listener: [Function: listener], eventName: 'load' } }46const { getEventListenerSet } = require("playwright/​lib/​helper");47const { chromium } = require("playwright");48(async () => {49const browser = await chromium.launch({ headless: false });50const context = await browser.newContext();

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Using AI Code Generation

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1const { getEventListenerSet } = require('playwright/​lib/​server/​events');2const events = getEventListenerSet();3console.log(events);4const { getEventListenerSet } = require('playwright/​lib/​server/​events');5const events = getEventListenerSet();6console.log(events);7const { getEventListenerSet } = require('playwright/​lib/​server/​events');8const events = getEventListenerSet();9console.log(events);10const { getEventListenerSet } = require('playwright/​lib/​server/​events');11const events = getEventListenerSet();12console.log(events);13const { getEventListenerSet } = require('playwright/​lib/​server/​events');14const events = getEventListenerSet();15console.log(events);16const { getEventListenerSet } = require('playwright/​lib/​server/​events');17const events = getEventListenerSet();18console.log(events);19const { getEventListenerSet } = require('playwright/​lib/​server/​events');20const events = getEventListenerSet();21console.log(events);22const { getEventListenerSet } = require('playwright/​lib/​server/​events');23const events = getEventListenerSet();24console.log(events);25const { getEventListenerSet } = require('playwright/​lib/​server/​events');26const events = getEventListenerSet();27console.log(events);28const { getEventListenerSet } = require('playwright/​lib/​server/​events');29const events = getEventListenerSet();30console.log(events);31const { getEventListenerSet } = require('playwright/​lib/​server/​events');32const events = getEventListenerSet();33console.log(events);34const { getEventListenerSet } = require('playwright/​lib/​server/​events');35const events = getEventListenerSet();36console.log(events);37const { getEventListenerSet } = require('playwright/​lib/​server/​events');

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Using AI Code Generation

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1const { getEventListenerSet } = require('playwright-core/​lib/​client/​eventEmitter');2const page = await browser.newPage();3const listeners = getEventListenerSet(page);4console.log(listeners);5const { getEventListenerSet } = require('playwright-core/​lib/​client/​eventEmitter');6const page = await browser.newPage();7const listeners = getEventListenerSet(page);8console.log(listeners);9const { getEventListenerSet } = require('playwright-core/​lib/​client/​eventEmitter');10const page = await browser.newPage();11const listeners = getEventListenerSet(page);12console.log(listeners);13const { getEventListenerSet } = require('playwright-core/​lib/​client/​eventEmitter');14const page = await browser.newPage();15const listeners = getEventListenerSet(page);16console.log(listeners);17const { getEventListenerSet } = require('playwright-core/​lib/​client/​eventEmitter');18const page = await browser.newPage();19const listeners = getEventListenerSet(page);20console.log(listeners);21const { getEventListenerSet } = require('playwright-core/​lib/​client/​eventEmitter');22const page = await browser.newPage();23const listeners = getEventListenerSet(page);24console.log(listeners);

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StackOverFlow community discussions

Questions
Discussion

Jest + Playwright - Test callbacks of event-based DOM library

firefox browser does not start in playwright

Is it possible to get the selector from a locator object in playwright?

How to run a list of test suites in a single file concurrently in jest?

Running Playwright in Azure Function

firefox browser does not start in playwright

This question is quite close to a "need more focus" question. But let's try to give it some focus:

Does Playwright has access to the cPicker object on the page? Does it has access to the window object?

Yes, you can access both cPicker and the window object inside an evaluate call.

Should I trigger the events from the HTML file itself, and in the callbacks, print in the DOM the result, in some dummy-element, and then infer from that dummy element text that the callbacks fired?

Exactly, or you can assign values to a javascript variable:

const cPicker = new ColorPicker({
  onClickOutside(e){
  },
  onInput(color){
    window['color'] = color;
  },
  onChange(color){
    window['result'] = color;
  }
})

And then

it('Should call all callbacks with correct arguments', async() => {
    await page.goto(`http://localhost:5000/tests/visual/basic.html`, {waitUntil:'load'})

    // Wait until the next frame
    await page.evaluate(() => new Promise(requestAnimationFrame))

    // Act
   
    // Assert
    const result = await page.evaluate(() => window['color']);
    // Check the value
})
https://stackoverflow.com/questions/65477895/jest-playwright-test-callbacks-of-event-based-dom-library

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