Test your AI Agents with the all-new Agent to Agent Testing Platform.Learn More
How to use createOnceHandler method in Playwright Internal
Best JavaScript code snippet using playwright-internal
history_provider.js
Source:history_provider.js 
...107 // teardown the listener108 teardownFn();109 });110 it('should call handler on state change', done => {111 createOnceHandler(history, done, loc => {112 expect(loc).to.be.a('object');113 });114 history.push({});115 });116 it('should pass location object to handler', done => {117 createOnceHandler(history, done, location => {118 expect(location.pathname).to.be.a('string');119 expect(location.hash).to.be.a('string');120 expect(location.state).to.be.an('object');121 expect(location.action).to.equal('push');122 });123 history.push(state);124 });125 it('should pass decompressed state to handler', done => {126 createOnceHandler(history, done, ({ state: curState }) => {127 expect(curState).to.eql(state);128 });129 history.push(state);130 });131 it('should pass in the previous location object to handler', done => {132 createOnceHandler(history, done, (location, prevLocation) => {133 expect(prevLocation.pathname).to.be.a('string');134 expect(prevLocation.hash).to.be.a('string');135 expect(prevLocation.state).to.be(null);136 expect(prevLocation.action).to.equal('push');137 });138 history.push(state);139 });140 });141 describe('resetOnChange', () => {142 // the history onChange handler was made async and now there's no way to know when the handler was called143 // TODO: restore these tests.144 it.skip('removes listeners', () => {145 const createHandler = () => {146 let callCount = 0;...
events.js
Source:events.js
...49 if (isUndef(cur.fns)) {50 cur = on[name] = createFnInvoker(cur, vm)51 }52 if (isTrue(event.once)) {53 cur = on[name] = createOnceHandler(event.name, cur, event.capture)54 }55 add(event.name, cur, event.capture, event.passive, event.params)56 } else if (cur !== old) {57 old.fns = cur58 on[name] = old59 }60 }61 for (name in oldOn) {62 if (isUndef(on[name])) {63 event = normalizeEvent(name)64 remove(event.name, oldOn[name], event.capture)65 }66 }67}...
Using AI Code Generation
1const { createOnceHandler } = require('playwright/lib/server/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 frame = page.mainFrame();8 const handler = createOnceHandler(frame);9 frame.on('load', handler);10 await frame.waitForLoadState();11 await page.screenshot({ path: 'wikipedia.png' });12 await browser.close();13})();
Using AI Code Generation
1const { createOnceHandler } = require('playwright/lib/server/instrumentation');2const { chromium } = require('playwright');3(async () => {4 const browser = await chromium.launch();5 const page = await browser.newPage();6 const onceHandler = createOnceHandler();7 await page.exposeBinding('onceHandler', onceHandler);8 await page.evaluate(async () => {9 window.addEventListener('message', event => {10 if (event.data.type === 'onceHandler') {11 window.onceHandler(event.data.data);12 }13 });14 });15 const result = await onceHandler(() => page.evaluate(() => {16 window.postMessage({ type: 'onceHandler', data: 42 }, '*');17 }));18 console.log(result);19 await browser.close();20})();21const { chromium } = require('playwright');22(async () => {23 const browser = await chromium.launch();24 const page = await browser.newPage();25 const result = await page.evaluate(() => {26 return new Promise(resolve => {27 window.addEventListener('message', event => {28 if (event.data.type === 'onceHandler') {29 resolve(event.data.data);30 }31 });32 window.postMessage({ type: 'onceHandler', data: 42 }, '*');33 });34 });35 console.log(result);36 await browser.close();37})();
Using AI Code Generation
1const { createOnceHandler } = require('@playwright/test/lib/server/progress');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.screenshot({ path: 'example.png' });8 await browser.close();9})();10const { createOnceHandler } = require('@playwright/test/lib/server/progress');11const { chromium } = require('playwright');12(async () => {13 const browser = await chromium.launch();14 const context = await browser.newContext();15 const page = await context.newPage();16 await page.screenshot({ path: 'example.png' });17 await browser.close();18})();
Using AI Code Generation
1const { createOnceHandler } = require('@playwright/test/lib/server/trace/recorder/traceEvents');2const { Page } = require('@playwright/test/lib/server/page');3const { Frame } = require('@playwright/test/lib/server/frame');4const { createGuid } = require('@playwright/test/lib/utils/utils');5const { Context } = require('@playwright/test/lib/server/browserContext');6const { guid } = createGuid();7const context = new Context(null, guid);8const page = new Page(context, guid);9const frame = new Frame(page, guid);10const handler = createOnceHandler(frame, 'page');11frame._channel.on('page', handler);12frame._channel.emit('page', { frameId: '123' });13frame._channel.emit('page', { frameId: '456' });14frame._channel.off('page', handler);15frame._channel.emit('page', { frameId: '789' });16frame._channel.emit('page', { frameId: '101' });
Using AI Code Generation
1const { createOnceHandler } = require('playwright/lib/server/chromium/crConnection');2const { helper } = require('playwright/lib/helper');3const { chromium } = require('playwright');4(async () => {5 const browser = await chromium.launch();6 const page = await browser.newPage();7 await browser.close();8})();9const { createOnceHandler } = require('playwright/lib/server/chromium/crConnection');10const { helper } = require('playwright/lib/helper');11const { chromium } = require('playwright');12(async () => {13 const browser = await chromium.launch();14 const page = await browser.newPage();15 await browser.close();16})();
Using AI Code Generation
1const { createOnceHandler } = require('playwright/lib/server/frames');2const { Frame } = require('playwright/lib/server/page');3const handler = createOnceHandler();4const frame = new Frame();5frame._page._onFrameDetached.add(handler);6const frameDetached = handler.promise;7const frame = await frameDetached;8console.log(frame.url());
Using AI Code Generation
1const createOnceHandler = require('@playwright/test/lib/server/createOnceHandler');2const server = await testWorker._browserServer;3const handler = createOnceHandler(async (req, res) => {4 res.end('done');5});6server.route('/path', handler);7test('my test', async ({testInfo}) => {8 const testWorker = testInfo.workers[testInfo.workerIndex];9});
Using AI Code Generation
1const { createOnceHandler } = require('@playwright/test/lib/server/inspector');2const handler = createOnceHandler(event => console.log(event));3const WebSocket = require('ws');4const wss = new WebSocket.Server({ port: 8080 });5wss.on('connection', function connection(ws) {6 ws.on('message', function incoming(message) {7 const event = JSON.parse(message);8 handler(event);9 });10});11wss.on('listening', function listening() {12 console.log('Server started');13});14const WebSocket = require('ws');15ws.on('open', function open() {16 ws.send(JSON.stringify({ type: 'event1' }));17 ws.send(JSON.stringify({ type: 'event2' }));18 ws.send(JSON.stringify({ type: 'event1' }));19});20ws.on('message', function incoming(data) {21 console.log(data);22});23{ type: 'event1' }24{ type: 'event2' }25const { createOnceHandler } = require('@playwright/test/lib/server/inspector');26const handler = createOnceHandler(event => console.log(event));27const WebSocket = require('ws');28const wss = new WebSocket.Server({ port: 8080 });29wss.on('connection', function connection(ws) {30 ws.on('message', function incoming(message) {31 const event = JSON.parse(message);32 handler(event);33 });34});35wss.on('listening', function listening() {36 console.log('Server started');37});38const WebSocket = require('ws');39ws.on('open', function open() {40 ws.send(JSON.stringify({
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:
- What is Playwright : Playwright is comparatively new but has gained good popularity. Get to know some history of the Playwright with some interesting facts connected with it.
- How To Install Playwright : Learn in detail about what basic configuration and dependencies are required for installing Playwright and run a test. Get a step-by-step direction for installing the Playwright automation framework.
- Playwright Futuristic Features: Launched in 2020, Playwright gained huge popularity quickly because of some obliging features such as Playwright Test Generator and Inspector, Playwright Reporter, Playwright auto-waiting mechanism and etc. Read up on those features to master Playwright testing.
- What is Component Testing: Component testing in Playwright is a unique feature that allows a tester to test a single component of a web application without integrating them with other elements. Learn how to perform Component testing on the Playwright automation framework.
- Inputs And Buttons In Playwright: Every website has Input boxes and buttons; learn about testing inputs and buttons with different scenarios and examples.
- Functions and Selectors in Playwright: Learn how to launch the Chromium browser with Playwright. Also, gain a better understanding of some important functions like “BrowserContext,” which allows you to run multiple browser sessions, and “newPage” which interacts with a page.
- Handling Alerts and Dropdowns in Playwright : Playwright interact with different types of alerts and pop-ups, such as simple, confirmation, and prompt, and different types of dropdowns, such as single selector and multi-selector get your hands-on with handling alerts and dropdown in Playright testing.
- Playwright vs Puppeteer: Get to know about the difference between two testing frameworks and how they are different than one another, which browsers they support, and what features they provide.
- Run Playwright Tests on LambdaTest: Playwright testing with LambdaTest leverages test performance to the utmost. You can run multiple Playwright tests in Parallel with the LammbdaTest test cloud. Get a step-by-step guide to run your Playwright test on the LambdaTest platform.
- Playwright Python Tutorial: Playwright automation framework support all major languages such as Python, JavaScript, TypeScript, .NET and etc. However, there are various advantages to Python end-to-end testing with Playwright because of its versatile utility. Get the hang of Playwright python testing with this chapter.
- Playwright End To End Testing Tutorial: Get your hands on with Playwright end-to-end testing and learn to use some exciting features such as TraceViewer, Debugging, Networking, Component testing, Visual testing, and many more.
- Playwright Video Tutorial: Watch the video tutorials on Playwright testing from experts and get a consecutive in-depth explanation of Playwright automation testing.
Run Playwright Internal automation tests on LambdaTest cloud grid
Perform automation testing on 3000+ real desktop and mobile devices online.
Try LambdaTest Now !!
Get 100 minutes of automation test minutes FREE!!
Was this article helpful?
