Join the 1-day Testing & QA Summit featuring 15+ Expert Speakers.Register for FREE! 
How to use mountState method in Playwright Internal
Best JavaScript code snippet using playwright-internal
App.js
Source:App.js 
...37 // example:38 // willAppear: apply height:auto39 // didAppear: assign actual height, start transition from zero40 child.canUnmount = nx(() => {41 if (mountState() === 2)42 return true;43 mountState(1);44 timer = setTimeout(() => mountState(2), 2000);45 });46 child.componentDidMount = () => {47 clearTimeout(timer);48 mountState(0);49 };50 return child; /// nx(() => child);51}52function wrapChildren(props, children) {53 let oldChildren, wrappers = {};54 return nx(() => {55 let childs = unwrap(children).filter(identity);56 let newIds = {};57 let result = childs.map(ch => {58 newIds[ch.id] = true;59 if (!wrappers[ch.id])60 wrappers[ch.id] = new TransitionItem(props, ch);61 return wrappers[ch.id];62 });...
Products.js
Source:Products.js
1import React, {Component} from 'react'2import {connect} from 'react-redux'3import Searchbar from '../components/Searchbar'4import FoodListCarousel from '../containers/FoodListCarousel'5class Products extends Component {6 constructor(){7 super()8 this.state= {9 mountState: true10 }11 }12 componentDidUpdate(){13 if(!this.state.mountState){14 this.setState({15 mountState: true16 })17 }18 }19 20 onCategoryChange = (e) => {21 console.log(e.target.value)22 this.setState({23 mountState: false24 })25 this.props.history.push(`/products/${e.target.value}`, {mountState: true})26 }27 renderSideBar = (categoryTitle) => {28 return (29 this.props.categories.map( category => {30 31 if(category.title === categoryTitle){32 return (33 <div class="input-group-text category-radio">34 <input type="radio" id = {`${category.name}`} name= "food-category" value={`${category.name}`} aria-label="Meat/Seafood Input" checked/> 35 <p>{`${category.title}`}</p>36 </div>37 )38 } else {39 return (40 <div class="input-group-text category-radio">41 <input type="radio" id = {`${category.name}`} name= "food-category" value={`${category.name}`} aria-label="Meat/Seafood Input"/>42 <p>{`${category.title}`}</p>43 </div>44 )45 }46 })47 )48 }49 render(){50 let categoryData = this.props.categories.find((category) => category.name === this.props.match.params.category)51 let categoryTitle = categoryData.title52 53 return (54 <div class = "products">55 <div class = "sidebar">56 57 <div class = "sidebar-menu">58 <h3>Categories</h3>59 <form id= "category-form" onChange = {this.onCategoryChange}>60 {this.renderSideBar(categoryTitle)}61 </form>62 63 </div>64 65 </div>66 <div class = "content"> 67 <div class = "container-fluid justify-content-center">68 <h1 class = "productsHeader">{categoryTitle}</h1>69 <div class = "row productsHeader">70 <div class="col-sm-5">71 <div className = "productsStore">72 <img style = {{height: '100%', width: '25%', marginBottom: "3%"}} src = {`${this.props.selectedStore.attributes.logo}`}></img>73 </div>74 75 </div>76 <div className = "col-sm-5">77 <Searchbar history = {this.props.history} onSearchSubmit={this.props.onSearchSubmit} onSearchChange={this.props.onSearchChange}/>78 </div>79 </div>80 {this.state.mountState ?81 <FoodListCarousel items = {this.props.items}/>82 :83 <div></div>84 }85 </div>86 </div>87 </div>88 )89 }90 91}92 93const mapStateToProps = (state, ownProps) => {94 console.log(ownProps)95 return({96 categories: state.categories,97 items: state.items.itemsList.data.filter(item => item.attributes.category === ownProps.match.params.category),98 item: state.items.selectedItem,99 selectedStore: state.stores.selectedStore100 })101}...
hooks.js
Source:hooks.js
1import { useCallback, useEffect, useLayoutEffect, useState, useRef } from 'react';2export const useMountState = (initialState = false) => {3 const mountState = useRef(initialState);4 useEffect(() => {5 mountState.current = true;6 return () => {7 mountState.current = false;8 };9 }, [true]);10 return mountState;11};12const createAsyncEffectHook = (useEffect) => (fn, input) => {13 const cbQueueRef = useRef([]);14 const [result, setResult] = useState(null);15 const [iterator, setIterator] = useState(null);16 const cleanup = useCallback(() => {17 for (let callback of cbQueueRef.current) {18 callback();19 }20 }, [iterator]);21 const onCleanup = useCallback((fn) => {22 cbQueueRef.current.push(fn);23 }, [true]);24 const next = useCallback((value) => {25 if (result && result.done) {26 return;27 }28 setResult(iterator.next(value));29 }, [result, iterator]);30 const throwback = useCallback((error) => {31 if (result && result.done) {32 return;33 }34 setResult(iterator.throw(error));35 }, [result]);36 useEffect(() => {37 cbQueueRef.current = [];38 setResult(null);39 const iterator = fn(onCleanup);40 setIterator(iterator);41 setResult(iterator.next());42 return cleanup;43 }, input);44 useEffect(() => {45 if (!result) return;46 let mounted = true;47 if (result.value instanceof Promise) {48 result.value.then((value) => {49 if (mounted) {50 next(value);51 }52 }).catch((error) => {53 if (mounted) {54 throwback(error);55 }56 });57 }58 else {59 next(result.value);60 }61 return () => {62 mounted = false;63 };64 }, [result]);65};66export const useAsyncEffect = createAsyncEffectHook(useEffect);67export const useAsyncLayoutEffect = createAsyncEffectHook(useLayoutEffect);68export const useAsyncCallback = (fn, input) => {69 const mountState = useMountState(true);70 return useCallback(async (...args) => {71 const iterator = fn(...args);72 let result = { value: undefined, done: false };73 while (!result.done && mountState.current) {74 try {75 if (result.value instanceof Promise) {76 result = iterator.next(await result.value);77 }78 else {79 result = iterator.next(result.value);80 }81 }82 catch (e) {83 if (mountState.current) {84 result = iterator.throw(e);85 }86 }87 }88 return result.value;89 }, input);...
SWShipsPage.js
Source:SWShipsPage.js
1import React,{useCallback, useEffect, useState} from "react";2import { Pagination } from "../Pagination/Pagination";3import { SWShipsList } from "../SWShipsList/SWShipsList";4export function SWShipsPage() {5 const [status,setStatus] = useState(`initial`);6 const [error,setError] = useState(null);7 const [data,setData] = useState([]);8 const [currentPage,setCurrentPage] = useState(1);9 const handlePageClick = useCallback((data)=>{10 let currentPage=1+data.selected;11 setCurrentPage(currentPage);12 },[currentPage]) 13 14 useEffect(() => {15 let mountState = {16 isMount:true,17 };18 setStatus(`loading`);19 setError(null);20 setData([]);21 fetch(`https://www.swapi.tech/api/planets?page=${currentPage}&limit=10`)22 .then((res) => {23 return res.json();24 })25 .then((data) => {26 if(mountState.isMount){27 setData(data);28 setError(null);29 setStatus(`success`);30 }31 })32 .catch((error) => {33 if(mountState.isMount){34 setError(error.message);35 setData(null);36 setStatus(`error`);37 }38 });39 return ()=>{40 mountState.isMount = false;41 }42 }, [currentPage])43 return(44 <div>45 {/* {JSON.stringify(data.results)} */}46 <SWShipsList 47 data={data.results}48 status={status}49 error={error}50 />51 {status===`success` && <Pagination 52 handlePageClick={handlePageClick}53 pageCount={data.total_pages}54 currentPage={currentPage}55 />56 }57 </div>58 );...
Mount.js
Source:Mount.js
...6 useState: mountState,7 // ...8 };9// * >>>>>>> ReactCurrentDispatcher.current.useState(initialState)10 // * è°ç¨useState(0)è¿åçå°±æ¯ HooksDispatcherOnMount.useState(0)ï¼å³ä¸é¢ç mountState(0) æ¹æ³11function mountState<S>(12 initialState: (() => S) | S,13 ): [S, Dispatch<BasicStateAction<S>>] {14 // 访é®Hooké¾è¡¨çä¸ä¸ä¸ªèç¹ï¼è·åå°æ°çHook对象15 const hook = mountWorkInProgressHook();16 // å¦æå
¥åæ¯functionåä¼è°ç¨ï¼ä½æ¯ä¸æä¾åæ°17 if (typeof initialState === 'function') {18 initialState = initialState();19 }20 // stateçåå§å21 hook.memoizedState = hook.baseState = initialState;22 // queueçåå§å23 const queue = (hook.queue = {24 last: null,...
ProductPage.js
Source:ProductPage.js
1import React, { useEffect, useState } from 'react';2import { Box } from "@mui/material";3import { Header } from '../components/Header';4import { ProductCard } from '../components/ProductCard';5import { useParams } from "react-router-dom";6export function ProductPage() {7 const [status, setStatus] = useState('initial');8 const [error, setError] = useState(null);9 const [item, setItem] = useState([]);10 11 const params = useParams();12 const prodId = params.id;13 useEffect(() => {14 let mountState = {15 isMount: true,16 };17 18 fetch(`https://61f5558a62f1e300173c40f3.mockapi.io/products/${prodId}`)19 .then((res) => {20 console.log('---> Products: res', res);21 return res.json();22 })23 .then((data) => {24 if (mountState.isMount) {25 console.log('---> Products: data', data);26 setError(null); 27 setStatus('success');28 setItem(data); 29 }30 }) 31 .catch((error) => {32 if (mountState.isMount) {33 console.log('---> Products: error', error);34 setError(error.message);35 setStatus('error');36 }37 })38 return () => {39 mountState.isMount = false;40 }41 42 43 },[]);44 45 return(46 <>47 <Header/> 48 <ProductCard49 id={item.id}50 name={item.title}51 photo={item.photo + item.id} 52 description={item.description} 53 price={item.price} />54 </>55 );...
rDom.js
Source:rDom.js
1class Rdom {2 constructor(str = '') {3 this.source = str;4 this.mountState = false;5 this.init(this.source)6 }7 init(str) {8 if (typeof str !== 'string') throw Error('not string');9 this.todom();10 return this11 }12 todom() {13 let a = document.createElement('div');14 a.innerHTML = this.source;15 this.dom = a.children.length===1 ? a.children[0] : a;16 }17 mount(el) {18 if(this.mountState || typeof el === 'undefined'){ return this}19 if(typeof el === 'string'){20 el = document.querySelector(el);21 }22 if(!!el && el.nodeType === 1){23 el.appendChild(this.dom);24 this.mountState = true;25 }26 return this27 }28 unmount(el) {29 // if(this.mountState){30 this.dom && this.dom.remove();31 this.mountState = false; 32 // };33 }34 get(l) {35 return typeof l === 'string' ? this.dom.querySelector(l) : this.dom;36 }37 getAll(l) {38 return typeof l === 'string' ? this.dom.querySelectorAll(l) : this.dom;39 }40 appendChild(el){41 this.dom.appendChild(el)42 }43}44export function undo(dom){45 if(!dom.nodeName) return dom;46 return dom.innerHTML47}48export function render(params) {49 return new Rdom(params)...
set-loading.js
Source:set-loading.js
1import React from 'react';2export default function setLoading(ref, callback) {3 const target = ref.current;4 if (target) {5 target.dataset.loading = '';6 setTimeout(() => {7 callback();8 setTimeout(() => {9 delete target.dataset.loading;10 });11 });12 }13}14export function useSetLoading(ref) {15 const mountState = React.useRef(false);16 React.useEffect(17 () => {18 mountState.current = true;19 return () => {20 mountState.current = false;21 };22 },23 []24 );25 const safeSetLoading = React.useCallback(26 callback => {27 setLoading(ref, () => {28 if (mountState.current) {29 callback();30 }31 });32 },33 [ref]34 );35 return safeSetLoading;...
Using AI Code Generation
1const { mountState } = require('playwright/lib/server/chromium/crBrowser');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 client = await page.context().newCDPSession(page);8 await mountState(client, { state: 'mounted' });9 await page.screenshot({ path: 'google.png' });10 await browser.close();11})();12const { unmountState } = require('playwright/lib/server/chromium/crBrowser');13const { chromium } = require('playwright');14(async () => {15 const browser = await chromium.launch();16 const context = await browser.newContext();17 const page = await context.newPage();18 const client = await page.context().newCDPSession(page);19 await unmountState(client, { state: 'unmounted' });20 await page.screenshot({ path: 'google.png' });21 await browser.close();22})();23const { getAccessibilityTree } = require('playwright/lib/server/chromium/crPage');24const { chromium } = require('playwright');25(async () => {26 const browser = await chromium.launch();27 const context = await browser.newContext();28 const page = await context.newPage();29 const client = await page.context().newCDPSession(page);30 const tree = await getAccessibilityTree(client);31 console.log(tree);32 await browser.close();33})();34const { getFullAccessibilityTree } = require('playwright/lib/server/chromium/crPage
Using AI Code Generation
1const { mountState } = require('@playwright/test');2const { test, expect } = require('@playwright/test');3test('test', async ({ page }) => {4 const state = await mountState(page);5 expect(state).toMatchSnapshot('main-page-snapshot.json');6});7const { test, expect } = require('@playwright/test');8const moment = require('moment');9expect.addSnapshotSerializer({10 test: (value) => moment.isMoment(value),11 print: (value) => value.format('YYYY-MM-DD'),12});13test('test', async ({ page }) => {14 const date = moment();15 expect(date).toMatchSnapshot('date-snapshot.txt');16});17To use Playwright Test with Jest, you can import Playwright Test as a module:18const { test, expect } = require('@playwright/test');19test('test', async ({ page }) => {20});21const { test, expect } = require('@playwright/test');22test('test', async ({ page }) => {23});
Using AI Code Generation
1const { mountState } = require('@playwright/test/lib/server/state');2const { test } = require('@playwright/test');3test('test', async ({ page }) => {4 const state = await mountState(page);5 console.log(state);6});7const { mountState } = require('@playwright/test/lib/server/state');8const { test } = require('@playwright/test');9test('test', async ({ page }) => {10 const state = await mountState(page);11 console.log(state);12});13import { mountState } from '@playwright/test/lib/server/state';14import { test } from '@playwright/test';15test('test', async ({ page }) => {16 const state = await mountState(page);17 console.log(state);18});
Using AI Code Generation
1const { mountState } = require('playwright/lib/server/injected/mountState');2const { context } = require('playwright/lib/server/injected/browserContext');3const { page } = require('playwright/lib/server/injected/page');4const { mountState } = require('playwright/lib/server/injected/mountState');5const { context } = require('playwright/lib/server/injected/browserContext');6const { page } = require('playwright/lib/server/injected/page');7const { chromium } = require('playwright');8(async () => {9 const browser = await chromium.launch();10 const context = await browser.newContext();11 const page = await context.newPage();12 await page.screenshot({ path: 'example.png' });13 await browser.close();14})();15const { mountState } = require('playwright/lib/server/injected/mountState');16const { context } = require('playwright/lib/server/injected/browserContext');17const { page } = require('playwright/lib/server/injected/page');18const { chromium } = require('playwright');19(async () => {20 const browser = await chromium.launch();21 const context = await browser.newContext();22 const page = await context.newPage();23 await page.screenshot({ path: 'example.png' });24 await browser.close();25})();26const { mountState } = require('playwright/lib/server/injected/mountState');27const { context } = require('playwright/lib/server/injected/browserContext');28const { page } = require('playwright/lib/server/injected/page');29const { chromium } = require('playwright');30(async () => {31 const browser = await chromium.launch();32 const context = await browser.newContext();33 const page = await context.newPage();34 await page.screenshot({ path: 'example.png' });35 await browser.close();36})();37const { mountState } = require('playwright/lib/server/injected/mountState');38const { context } = require('playwright/lib/server/injected/browserContext');39const { page } =
Using AI Code Generation
1const { mountState } = require('@playwright/test/lib/server/playwright');2const { webkit } = require('playwright');3(async () => {4 const browser = await webkit.launch({ headless: false });5 const context = await browser.newContext();6 const page = await context.newPage();7 await mountState(page, { colorScheme: 'dark' });8 await page.screenshot({ path: 'dark.png' });9 await mountState(page, { colorScheme: 'light' });10 await page.screenshot({ path: 'light.png' });11 await browser.close();12})();
Using AI Code Generation
1const { mountState } = require('playwright/lib/server/browserContext');2const { test, expect } = require('@playwright/test');3test('test', async ({ page }) => {4 const context = await page.context();5 const storageState = await mountState(context);6 expect(storageState).toBeTruthy();7});
Using AI Code Generation
1const { mountState } = require('./playwright');2const { test } = require('@playwright/test');3test('test', async ({ page }) => {4 await page.click('input[name="q"]');5 await page.keyboard.type('Playwright');6 await page.keyboard.press('Enter');7 await page.waitForSelector('text="All about Playwright"');8 await page.click('text="All about Playwright"');9 await page.waitForSelector('text="Getting Started"');10 await page.click('text="Getting Started"');11 await mountState('testState');12 await page.click('text="Download"');13 await page.waitForSelector('text="Install with npm"');14 await page.click('text="Install with npm"');15 await page.waitForSelector('text="npm install playwright"');16 await page.click('text="npm install playwright"');17 await page.waitForSelector('text="Install with Yarn"');18 await page.click('text="Install with Yarn"');19 await page.waitForSelector('text="yarn add playwright"');20 await page.click('text="yarn add playwright"');21 await page.waitForSelector('text="Install with pnpm"');22 await page.click('text="Install with pnpm"');23 await page.waitForSelector('text="pnpm add playwright"');24 await page.click('text="pnpm add playwright"');25 await page.waitForSelector('text="Install from source"');26 await page.click('text="Install from source"');27 await page.waitForSelector('text="from source"');28 await page.click('text="from source"');29 await page.waitForSelector('text="Install from npm"');30 await page.click('text="Install from npm"');31 await page.waitForSelector('text="npm install playwright"');32 await page.click('text="npm install playwright"');33 await page.waitForSelector('text="Install from Yarn"');34 await page.click('text="Install from Yarn"');35 await page.waitForSelector('text="yarn add playwright"');36 await page.click('text="yarn add playwright"');37 await page.waitForSelector('text="Install from pnpm"');38 await page.click('text="Install from pnpm"');39 await page.waitForSelector('text="
Using AI Code Generation
1const { test, expect } = require('@playwright/test');2test('My first test', async ({ page }) => {3 await page.mountState();4 await page.click('text=Get started');5 await page.click('text=Docs');6 await page.click('text=API');7 const element = await page.$('text=API');8 expect(element).toBeTruthy();9});
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?
