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How to use _initializePreview method in Playwright Internal
Best JavaScript code snippet using playwright-internal
dom.js
Source: dom.js 
...185 constructor(context, objectId) {186 super(context, 'node', undefined, objectId)187 this._page = void 0188 this._page = context.frame._page189 this._initializePreview().catch((e) => {})190 }191 async _initializePreview() {192 const utility = await this._context.injectedScript()193 this._setPreview(194 await utility.evaluate(195 (injected, e) => 'JSHandle@' + injected.previewNode(e),196 this197 )198 )199 }200 asElement() {201 return this202 }203 async evaluateInUtility(pageFunction, arg) {204 try {205 const utility = await this._context.frame._utilityContext()...
server.js
Source: server.js
...119 debug('Machine ' + this.uuid + ' connect');120 this._initializeCommand(this.services.command);121 this._initializeStatus(this.services.status);122 this._initializeError(this.services.error);123 this._initializePreview(this.services.preview);124 this.isConnected = true;125};126Machine.prototype.disconnect = function() {127 if (!this.isConnected) { return; }128 debug('Machine ' + this.uuid + ' disconnect');129 this.clients.command.close();130 this.clients.status.close();131 this.clients.error.close();132 this.clients.preview.close();133 this.clients.command = undefined;134 this.clients.status = undefined;135 this.clients.error = undefined;136 this.clients.preview = undefined;137 this.isConnected = false;...
index.js
Source: index.js
...91 debug('Machine ' + this.uuid + ' connect');92 this._initializeCommand(this.services.command);93 this._initializeStatus(this.services.status);94 this._initializeError(this.services.error);95 this._initializePreview(this.services.preview);96 this.isConnected = true;97};98Machine.prototype.disconnect = function() {99 if (!this.isConnected) { return; }100 debug('Machine ' + this.uuid + ' disconnect');101 this.clients.command.close();102 this.clients.status.close();103 this.clients.error.close();104 this.clients.preview.close();105 this.clients.command = undefined;106 this.clients.status = undefined;107 this.clients.error = undefined;108 this.clients.preview = undefined;109 this.isConnected = false;...
Using AI Code Generation
1const { chromium } = require('playwright');2(async () => {3 const browser = await chromium._initializePreview();4 const context = await browser.newContext();5 const page = await context.newPage();6 await page.screenshot({ path: `example.png` });7 await browser.close();8})();
Using AI Code Generation
1const {chromium} = require('playwright');2(async () => {3 const browser = await chromium.launch({headless: false});4 const context = await browser.newContext();5 const page = await context.newPage();6 await page._initializePreview();7})();
Using AI Code Generation
1const { Playwright } = require('playwright-core/lib/server/playwright.js');2const { BrowserServer } = require('playwright-core/lib/server/browserServer.js');3const playwright = new Playwright();4const browserServer = await playwright._launchServer('chromium', { headless: false, args: ['--remote-debugging-port=9222'] });5const browser = await playwright._connectToBrowser(browserServer);6const { Page } = require('playwright-core/lib/server/page.js');7const page = await browser._defaultContext._initializePageInNewContext();8await page.screenshot({ path: 'exa
Using AI Code Generation
1const { Playwright } = require('playwright');2const playwright = new Playwright();3const browser = await playwright._initializePreview();4const { Playwright } = require('playwright');5const playwright = new Playwright();6const browser = await playwright._initializePreview();7const { Playwright } = require('playwright');8const playwright = new Playwright();9const browser = await playwright._initializePreview();10const { Playwright } = require('playwright');11const playwright = new Playwright();12const browser = await playwright._initializePreview();13const { Playwright } = require('playwright');14const playwright = new Playwright();15const browser = await playwright._initializePreview();16const { Playwright } = require('playwright');17const playwright = new Playwright();18const browser = await playwright._initializePreview();19const { Playwright } = require('playwright');20const playwright = new Playwright();21const browser = await playwright._initializePreview();22const { Playwright } = require('playwright');23const playwright = new Playwright();24const browser = await playwright._initializePreview();25const { Playwright } = require('playwright');26const playwright = new Playwright();27const browser = await playwright._initializePreview();28const { Playwright } = require('playwright');29const playwright = new Playwright();30const browser = await playwright._initializePreview();31const { Playwright } = require('playwright');32const playwright = new Playwright();33const browser = await playwright._initializePreview();34const { Playwright } = require('playwright');35const playwright = new Playwright();36const browser = await playwright._initializePreview();37const { Playwright }
Using AI Code Generation
1const playwright = require('playwright');2const { InternalAPI } = require('playwright/internal');3const { BrowserContext } = require('playwright/browsertype');4const { BrowserType } = require('playwright/browsertype');5const browserType = playwright.chromium;6const browser = await browserType.launch();7const context = await browser.newContext();8const page = await context.newPage();9await InternalAPI._initializePreview(page);10const playwright = require('playwright');11const { InternalAPI } = require('playwright/internal');12const { BrowserContext } = require('playwright/browsertype');13const { BrowserType } = require('playwright/browsertype');14const browserType = playwright.chromium;15const browser = await browserType.launch();16const context = await browser.newContext();17const page = await context.newPage();18await InternalAPI._initializePreview(page);19const playwright = require('playwright');20const { InternalAPI } = require('playwright/internal');21const { BrowserContext } = require('playwright/browsertype');22const { BrowserType } = require('playwright/browsertype');23const browserType = playwright.chromium;24const browser = await browserType.launch();25const context = await browser.newContext();26const page = await context.newPage();27await InternalAPI._initializePreview(page);28const playwright = require('playwright');29const { InternalAPI } = require('playwright/internal');30const { BrowserContext } = require('playwright/browsertype');31const { BrowserType } = require('playwright/browsertype');32const browserType = playwright.chromium;33const browser = await browserType.launch();34const context = await browser.newContext();35const page = await context.newPage();36await InternalAPI._initializePreview(page);37const playwright = require('playwright');38const { InternalAPI } = require('playwright/internal');39const { BrowserContext } = require('playwright/browsertype');40const { BrowserType } = require('playwright/browsertype');
Using AI Code Generation
1const { Playwright } = require('@playwright/test');2const { chromium } = require('playwright');3(async () => {4 const playwright = new Playwright();5 const browser = await chromium.launch();6 const context = await browser.newContext();7 const page = await context.newPage();8 await playwright._initializePreview(page);9 await page.screenshot({ path: 'preview.png' });10 await browser.close();11})();12const { chromium } = require('playwright');13(async () => {14 const browser = await chromium.launch();15 const context = await browser.newContext();16 const page = await context.newPage();17 await page.screenshot({ path: 'preview.png' });18 await browser.close();19})();
StackOverFlow community discussions
Jest + Playwright - Test callbacks of event-based DOM library
How to run a list of test suites in a single file concurrently in jest?
firefox browser does not start in playwright
firefox browser does not start in playwright
Is it possible to get the selector from a locator object in playwright?
Running Playwright in Azure Function
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
})
Blogs
Check out the latest blogs from LambdaTest on this topic:
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Entering the world of testers, one question started to formulate in my mind: “what is the reason that bugs happen?”.
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.
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- 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.
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