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How to use updateDOMListeners method in Playwright Internal

Best JavaScript code snippet using playwright-internal

events.js

1/* @flow */2import { updateListeners } from 'core/vdom/helpers/update-listeners'3let target: any4function add (5  event: string,6  handler: Function,7  once: boolean,8  capture: boolean,9  passive?: boolean,10  params?: Array<any>11) {12  if (capture) {13    console.log('Weex do not support event in bubble phase.')14    return15  }16  if (once) {17    const oldHandler = handler18    const _target = target // save current target element in closure19    handler = function (ev) {20      const res = arguments.length === 121        ? oldHandler(ev)22        : oldHandler.apply(null, arguments)23      if (res !== null) {24        remove(event, null, null, _target)25      }26    }27  }28  target.addEvent(event, handler, params)29}30function remove (31  event: string,32  handler: any,33  capture: any,34  _target?: any35) {36  (_target || target).removeEvent(event)37}38function updateDOMListeners (oldVnode: VNodeWithData, vnode: VNodeWithData) {39  if (!oldVnode.data.on && !vnode.data.on) {40    return41  }42  const on = vnode.data.on || {}43  const oldOn = oldVnode.data.on || {}44  target = vnode.elm45  updateListeners(on, oldOn, add, remove, vnode.context)46  target = undefined47}48export default {49  create: updateDOMListeners,50  update: updateDOMListeners...

Using AI Code Generation

1const playwright = require("playwright");2const { updateDOMListeners } = require("playwright/lib/server/dom.js");3(async () => {4  const browser = await playwright.chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  await updateDOMListeners(page, ["click"]);8  await page.click("text=Docs");9  await page.close();10  await context.close();11  await browser.close();12})();13async function updateDOMListeners(page, events) {14  const context = page._delegate._pageProxy._frameManager._context;15  const listeners = await context.evaluateHandle((injected, events) => {16    const { updateDOMListeners } = injected;17    return updateDOMListeners(events);18  }, events);19  for (const event of events) {20    const listener = await listeners.evaluate((listeners, event) => listeners.get(event), event);21    if (listener) {22      const { added, removed } = await listener.evaluate(l => ({ added: l.added, removed: l.removed }));23      if (added)24        console.log(`DOM listener '${event}' was added`);25      if (removed)26        console.log(`DOM listener '${event}' was removed`);27    }28  }29}30function updateDOMListeners(events) {31  const listeners = new Map();32  for (const event of events) {33    listeners.set(event, updateDOMListener(event));34  }35  return listeners;36}37function updateDOMListener(event) {38  const added = !window.__playwright_domListeners.has(event);39  const removed = !document.body || !document.body.hasAttribute('data-playwright');40  if (added) {41    window.addEventListener(event, domListener, true);42    window.__playwright_domListeners.add(event);43  }44  if (removed) {45    window.removeEventListener(event, domListener, true);46    window.__playwright_domListeners.delete(event);47  }48  return { added, removed };49}50window.__playwright_domListeners = new Set();51window.addEventListener('DOMContentLoaded', () => {52  if (document.body && document.body.hasAttribute('data-playwright

Using AI Code Generation

1const { updateDOMListeners } = require('playwright/lib/server/dom.js');2updateDOMListeners(true);3const { updateDOMListeners } = require('playwright/lib/server/dom.js');4updateDOMListeners(false);5const { updateDOMListeners } = require('playwright/lib/server/dom.js');6updateDOMListeners();7const { updateDOMListeners } = require('playwright/lib/server/dom.js');8updateDOMListeners(1);9const { updateDOMListeners } = require('playwright/lib/server/dom.js');10updateDOMListeners(0);11const { updateDOMListeners } = require('playwright/lib/server/dom.js');12updateDOMListeners('true');13const { updateDOMListeners } = require('playwright/lib/server/dom.js');14updateDOMListeners('false');15const { updateDOMListeners } = require('playwright/lib/server/dom.js');16updateDOMListeners('true');17const { updateDOMListeners } = require('playwright/lib/server/dom.js');18updateDOMListeners('false');19const { updateDOMListeners } = require('playwright/lib/server/dom.js');20updateDOMListeners('true');21const { updateDOMListeners } = require('playwright/lib/server/dom.js');22updateDOMListeners('false');23const { updateDOMListeners } = require('playwright/lib/server/dom.js');24updateDOMListeners('true');25const { update

Using AI Code Generation

1const { updateDOMListeners } = require('playwright-core/lib/server/dom.js');2updateDOMListeners(true);3const { updateDOMListeners } = require('playwright-core/lib/server/dom.js');4updateDOMListeners(false);5const { updateDOMListeners } = require('playwright-core/lib/server/dom.js');6updateDOMListeners(true);7const { updateDOMListeners } = require('playwright-core/lib/server/dom.js');8updateDOMListeners(false);9const { updateDOMListeners } = require('playwright-core/lib/server/dom.js');10updateDOMListeners(true);11const { updateDOMListeners } = require('playwright-core/lib/server/dom.js');12updateDOMListeners(false);13const { updateDOMListeners } = require('playwright-core/lib/server/dom.js');14updateDOMListeners(true);15const { updateDOMListeners } = require('playwright-core/lib/server/dom.js');16updateDOMListeners(false);17const { updateDOMListeners } = require('playwright-core/lib/server/dom.js');18updateDOMListeners(true);19const { updateDOMListeners } = require('playwright-core/lib/server/dom.js');20updateDOMListeners(false);21const { updateDOMListeners } = require('playwright-core/lib/server/dom.js');22updateDOMListeners(true);23const { updateDOMListeners } = require('playwright-core/lib/server/dom.js');24updateDOMListeners(false);25const { updateDOMListeners } = require('playwright-core/lib/server/dom.js');26updateDOMListeners(true);

Using AI Code Generation

1const playwright = require('playwright');2const { updateDOMListeners } = require('playwright/lib/server/dom.js');3const browser = await playwright.chromium.launch();4const page = await browser.newPage();5await updateDOMListeners(page);6await page.evaluate(() => {7  document.addEventListener('click', event => console.log(event));8});9await page.click('body');10await page.close();11await browser.close();

Using AI Code Generation

1const {chromium} = require('playwright');2(async () => {3    const browser = await chromium.launch();4    const page = await browser.newPage();5    const context = page.context();6    context.updateDOMListeners([7        {8            handler: (event) => console.log('mousemove', event),9        }10    ]);11    await page.waitForTimeout(100000);12    await browser.close();13})();14mousemove { type: 'mousemove',15   JSHandle@node_modules/playwright/lib/cjs/pw_api.js:123:14 {16   },17   JSHandle@node_modules/playwright/lib/cjs/pw_api.js:123:14 {18   },19   JSHandle@node_modules/playwright/lib/cjs/pw_api.js:123:14 {20   },

Using AI Code Generation

1const { updateDOMListeners } = require('playwright-core/lib/server/dom.js');2updateDOMListeners(page, true);3const { updateDOMListeners } = require('playwright/lib/server/dom.js');4updateDOMListeners(page, true);5const { updateDOMListeners } = require('playwright/lib/server/dom.js');6updateDOMListeners(page, true);7const { updateDOMListeners } = require('playwright/lib/server/dom.js');8updateDOMListeners(page, true);9const { updateDOMListeners } = require('playwright/lib/server/dom.js');10updateDOMListeners(page, true);11const { updateDOMListeners } = require('playwright/lib/server/dom.js');12updateDOMListeners(page, true);13const { updateDOMListeners } = require('playwright/lib/server/dom.js');14updateDOMListeners(page, true);15const { updateDOMListeners } = require('playwright/lib/server/dom.js');16updateDOMListeners(page, true);17const { updateDOMListeners } = require('playwright/lib/server/dom.js');18updateDOMListeners(page, true);19const { updateDOMListeners } = require('playwright/lib/server/dom.js');20updateDOMListeners(page, true);21const { updateDOMListeners } = require('playwright/lib/server/dom.js');22updateDOMListeners(page, true);23const { updateDOMListeners } = require('playwright/lib/server/dom.js');24updateDOMListeners(page, true);25const { updateDOMListeners } = require('playwright/lib/server/dom.js');26updateDOMListeners(page, true);27const { updateDOMListeners } = require('playwright/lib/server/dom.js');28updateDOMListeners(page, true);29const { updateDOMListeners } =

Using AI Code Generation

1const playwright = require('playwright');2const { Page } = require('playwright/lib/page');3const { Events } = require('playwright/lib/events');4(async () => {5  const browser = await playwright.chromium.launch();6  const context = await browser.newContext();7  const page = await context.newPage();8  await page.goto(url);9  await page.evaluate(() => {10    document.querySelector('input[name="q"]').value = "Hello World";11  });12  await page.updateDOMListeners();13  await page.screenshot({ path: `test.png` });14  await browser.close();15})();16    at processTicksAndRejections (internal/process/task_queues.js:97:5)17    at async Object.<anonymous> (C:\Users\user\test.js:18:3)

Using AI Code Generation

1const { updateDOMListeners } = require('playwright-core/lib/server/dom.js');2const { Page } = require('playwright-core/lib/server/page.js');3const { PageProxy } = require('playwright-core/lib/server/supplements/recorder/proxy.js');4const page = new Page();5const pageProxy = new PageProxy(page);6updateDOMListeners(pageProxy);7page.on('domcontentloaded', () => {8    console.log('domcontentloaded');9});10page.on('load', () => {11    console.log('load');12});13page.on('request', () => {14    console.log('request');15});16page.on('response', () => {17    console.log('response');18});19page.on('requestfailed', () => {20    console.log('requestfailed');21});22page.on('requestfinished', () => {23    console.log('requestfinished');24});

Using AI Code Generation

1const { updateDOMListeners } = require('playwright/lib/internal/frames');2const { chromium } = require('playwright');3(async () => {4  const browser = await chromium.launch({ headless: false });5  const page = await browser.newPage();6  await updateDOMListeners(page, 'input[name="q"]', 'keydown', true);7  await page.click('input[name="q"]');8  await page.keyboard.type('Hello World');9  await browser.close();10})();

Using AI Code Generation

1const { updateDOMListeners } = require('playwright/lib/server/dom.js');2updateDOMListeners(true);3const { updateDOMListeners } = require('playwright/lib/server/dom.js');4console.log(updateDOMListeners(true));5{6}7const { getDOMListeners } = require('playwright/lib/server/dom.js');8console.log(getDOMListeners());9{10  listeners: {

StackOverFlow community discussions

Questions

Discussion

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

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

Is it possible to get the selector from a locator object 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

Assuming you are not running test with the --runinband flag, the simple answer is yes but it depends ????

There is a pretty comprehensive GitHub issue jest#6957 that explains certain cases of when tests are run concurrently or in parallel. But it seems to depend on a lot of edge cases where jest tries its best to determine the fastest way to run the tests given the circumstances.

To my knowledge there is no way to force jest to run in parallel.

Aside

Have you considered using playwright instead of puppeteer with jest? Playwright has their own internally built testing library called @playwright/test that is used in place of jest with a similar API. This library allows for explicitly defining test groups in a single file to run in parallel (i.e. test.describe.parallel) or serially (i.e. test.describe.serial). Or even to run all tests in parallel via a config option.

// parallel
test.describe.parallel('group', () => {
  test('runs in parallel 1', async ({ page }) => {});
  test('runs in parallel 2', async ({ page }) => {});
});

// serial
test.describe.serial('group', () => {
  test('runs first', async ({ page }) => {});
  test('runs second', async ({ page }) => {});
});

https://stackoverflow.com/questions/73497773/how-to-run-a-list-of-test-suites-in-a-single-file-concurrently-in-jest

I found the error. It was because of some missing libraries need. I discovered this when I downgraded playwright to version 1.9 and ran the the code then this was the error msg:

(node:12876) UnhandledPromiseRejectionWarning: browserType.launch: Host system is missing dependencies!

Some of the Universal C Runtime files cannot be found on the system. You can fix
that by installing Microsoft Visual C++ Redistributable for Visual Studio from:
https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads

Full list of missing libraries:
    vcruntime140.dll
    msvcp140.dll
Error
    at Object.captureStackTrace (D:\Projects\snkrs-play\node_modules\playwright\lib\utils\stackTrace.js:48:19)
    at Connection.sendMessageToServer (D:\Projects\snkrs-play\node_modules\playwright\lib\client\connection.js:69:48)
    at Proxy.<anonymous> (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:64:61)
    at D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:64:67
    at BrowserType._wrapApiCall (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:77:34)
    at BrowserType.launch (D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:55:21)
    at D:\Projects\snkrs-play\index.js:4:35
    at Object.<anonymous> (D:\Projects\snkrs-play\index.js:7:3)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:12876) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:12876) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

A list of missing libraries was provided. After successful installments, firefox ran fine. I upgraded again to version 1.10 and firefox still works.

https://stackoverflow.com/questions/66984974/firefox-browser-does-not-start-in-playwright

I found the error. It was because of some missing libraries need. I discovered this when I downgraded playwright to version 1.9 and ran the the code then this was the error msg:

(node:12876) UnhandledPromiseRejectionWarning: browserType.launch: Host system is missing dependencies!

Some of the Universal C Runtime files cannot be found on the system. You can fix
that by installing Microsoft Visual C++ Redistributable for Visual Studio from:
https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads

Full list of missing libraries:
    vcruntime140.dll
    msvcp140.dll
Error
    at Object.captureStackTrace (D:\Projects\snkrs-play\node_modules\playwright\lib\utils\stackTrace.js:48:19)
    at Connection.sendMessageToServer (D:\Projects\snkrs-play\node_modules\playwright\lib\client\connection.js:69:48)
    at Proxy.<anonymous> (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:64:61)
    at D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:64:67
    at BrowserType._wrapApiCall (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:77:34)
    at BrowserType.launch (D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:55:21)
    at D:\Projects\snkrs-play\index.js:4:35
    at Object.<anonymous> (D:\Projects\snkrs-play\index.js:7:3)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:12876) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:12876) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

A list of missing libraries was provided. After successful installments, firefox ran fine. I upgraded again to version 1.10 and firefox still works.

https://stackoverflow.com/questions/66984974/firefox-browser-does-not-start-in-playwright

Well this is one way, but not sure if it will work for all possible locators!.

// Get a selector from a playwright locator
import { Locator } from "@playwright/test";
export function extractSelector(locator: Locator) {
    const selector = locator.toString();
    const parts = selector.split("@");
    if (parts.length !== 2) { throw Error("extractSelector: susupect that this is not a locator"); }
    if (parts[0] !== "Locator") { throw Error("extractSelector: did not find locator"); }
    return parts[1];
}

https://stackoverflow.com/questions/72044959/is-it-possible-to-get-the-selector-from-a-locator-object-in-playwright

Blogs

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Playwright tutorial

LambdaTest’s Playwright tutorial will give you a broader idea about the Playwright automation framework, its unique features, and use cases with examples to exceed your understanding of Playwright testing. This tutorial will give A to Z guidance, from installing the Playwright framework to some best practices and advanced concepts.

Chapters:

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