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How to use startWatchingForValueChange method in Playwright Internal

Best JavaScript code snippet using playwright-internal

ChangeEventPlugin.js

Source:ChangeEventPlugin.js

...76      activeElementValue = '' + val;77      activeElementValueProp.set.call(this, val);78    }79  };80  function startWatchingForValueChange(target, targetID) {81    activeElement = target;82    activeElementID = targetID;83    activeElementValue = target.value;84    activeElementValueProp = Object.getOwnPropertyDescriptor(target.constructor.prototype, 'value');85    Object.defineProperty(activeElement, 'value', newValueProp);86    activeElement.attachEvent('onpropertychange', handlePropertyChange);87  }88  function stopWatchingForValueChange() {89    if (!activeElement) {90      return;91    }92    delete activeElement.value;93    activeElement.detachEvent('onpropertychange', handlePropertyChange);94    activeElement = null;95    activeElementID = null;96    activeElementValue = null;97    activeElementValueProp = null;98  }99  function handlePropertyChange(nativeEvent) {100    if (nativeEvent.propertyName !== 'value') {101      return;102    }103    var value = nativeEvent.srcElement.value;104    if (value === activeElementValue) {105      return;106    }107    activeElementValue = value;108    manualDispatchChangeEvent(nativeEvent);109  }110  function getTargetIDForInputEvent(topLevelType, topLevelTarget, topLevelTargetID) {111    if (topLevelType === topLevelTypes.topInput) {112      return topLevelTargetID;113    }114  }115  function handleEventsForInputEventIE(topLevelType, topLevelTarget, topLevelTargetID) {116    if (topLevelType === topLevelTypes.topFocus) {117      stopWatchingForValueChange();118      startWatchingForValueChange(topLevelTarget, topLevelTargetID);119    } else if (topLevelType === topLevelTypes.topBlur) {120      stopWatchingForValueChange();121    }122  }123  function getTargetIDForInputEventIE(topLevelType, topLevelTarget, topLevelTargetID) {124    if (topLevelType === topLevelTypes.topSelectionChange || topLevelType === topLevelTypes.topKeyUp || topLevelType === topLevelTypes.topKeyDown) {125      if (activeElement && activeElement.value !== activeElementValue) {126        activeElementValue = activeElement.value;127        return activeElementID;128      }129    }130  }131  function shouldUseClickEvent(elem) {132    return (elem.nodeName === 'INPUT' && (elem.type === 'checkbox' || elem.type === 'radio'));...

7340.js

Source:7340.js

1{2  if (topLevelType === "topFocus") {3    stopWatchingForValueChange();4    startWatchingForValueChange(target, targetInst);5  } else if (topLevelType === "topBlur") {6    stopWatchingForValueChange();7  }...

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const context = await browser.newContext();5  const page = await context.newPage();6  await page.waitForSelector('text=Your user agent is');7  await page.startWatchingForValueChange('text=Your user agent is');8  await page.waitForSelector('text=Your user agent is');9  await page.stopWatchingForValueChange('text=Your user agent is');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.waitForSelector('text=Your user agent is');18  await page.startWatchingForValueChange('text=Your user agent is');19  await page.waitForSelector('text=Your user agent is');20  await page.stopWatchingForValueChange('text=Your user agent is');21  await browser.close();22})();

Using AI Code Generation

1const {chromium} = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const context = await browser.newContext();5  const page = await context.newPage();6  const element = await page.$('input');7  const value = await element.evaluate(element => element.value);8  console.log(value);9  await browser.close();10})();

Using AI Code Generation

1const { chromium } = require('playwright');2const path = require('path');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  await page.fill('input[type="text"]', 'Playwright');8  await page.press('input[type="text"]', 'Enter');9  await page.waitForSelector('text=Playwright');10  await page.click('text=Playwright');11  await page._delegate.startWatchingForValueChange('input[type="text"]');12  await page.fill('input[type="text"]', 'Playwright is awesome');13  await page.press('input[type="text"]', 'Enter');14  await page.waitForSelector('text=Playwright is awesome');15  await page.close();16  await context.close();17  await browser.close();18})();19const { chromium } = require('playwright');20const path = require('path');21describe('Playwright', () => {22  it('should work', async () => {23    const browser = await chromium.launch();24    const context = await browser.newContext();25    const page = await context.newPage();26    await page.fill('input[type="text"]', 'Playwright');27    await page.press('input[type="text"]', 'Enter');28    await page.waitForSelector('text=Playwright');29    await page.click('text=Playwright');30    await page._delegate.startWatchingForValueChange('input[type="text"]');31    await page.fill('input[type="text"]', 'Playwright is awesome');32    await page.press('input[type="text"]', 'Enter');33    await page.waitForSelector('text=Playwright is awesome');34    await page.close();35    await context.close();36    await browser.close();37  });38});

Using AI Code Generation

1const { chromium } = require('playwright-core');2(async () => {3  const browser = await chromium.launch({ headless: false });4  const context = await browser.newContext();5  const page = await context.newPage();6  const element = await page.$('text=Get Started');7  await element.evaluate(element => element.startWatchingForValueChange());8  await element.evaluate(element => element.stopWatchingForValueChange());9  await browser.close();10})();11const { chromium } = require('playwright-core');12(async () => {13  const browser = await chromium.launch({ headless: false });14  const context = await browser.newContext();15  const page = await context.newPage();16  const element = await page.$('text=Get Started');17  await element.evaluate(element => element.startWatchingForAttribute('href'));18  await element.evaluate(element => element.stopWatchingForAttribute('href'));19  await browser.close();20})();21const { chromium } = require('playwright-core');22(async () => {23  const browser = await chromium.launch({ headless: false });24  const context = await browser.newContext();25  const page = await context.newPage();26  const element = await page.$('text=Get Started');27  await element.evaluate(element => element.startWatchingForText());28  await element.evaluate(element => element.stopWatchingForText());29  await browser.close();30})();31const { chromium } = require('playwright-core');32(async () => {33  const browser = await chromium.launch({ headless: false });34  const context = await browser.newContext();35  const page = await context.newPage();36  const element = await page.$('text=Get Started');37  await element.evaluate(element => element.startWatchingForChildren());38  await element.evaluate(element => element.stopWatchingForChildren());39  await browser.close();40})();41const { chromium } = require('playwright-core');42(async () => {43  const browser = await chromium.launch({ headless: false });

Using AI Code Generation

1const { startWatchingForValueChange } = require('playwright/lib/server/chromium/crNetworkManager');2const { chromium } = require('playwright');3(async () => {4  const browser = await chromium.launch();5  const page = await browser.newPage();6  await startWatchingForValueChange(page, 'input[name="q"]', (newValue) => {7    console.log('input value changed to', newValue);8  });9  await page.fill('input[name="q"]', 'Hello World');10  await page.fill('input[name="q"]', 'Hello World 2');11  await page.fill('input[name="q"]', 'Hello World 3');12  await page.fill('input[name="q"]', 'Hello World 4');13  await page.fill('input[name="q"]', 'Hello World 5');14  await page.fill('input[name="q"]', 'Hello World 6');15  await page.fill('input[name="q"]', 'Hello World 7');16  await page.fill('input[name="q"]', 'Hello World 8');17  await page.fill('input[name="q"]', 'Hello World 9');18  await page.fill('input[name="q"]', 'Hello World 10');19  await page.fill('input[name="q"]', 'Hello World 11');20  await page.fill('input[name="q"]', 'Hello World 12');21  await page.fill('input[name="q"]', 'Hello World 13');22  await page.fill('input[name="q"]', 'Hello World 14');23  await page.fill('input[name="q"]', 'Hello World 15');24  await page.fill('input[name="q"]', 'Hello World 16');25  await page.fill('input[name="q"]', 'Hello World 17');26  await page.fill('input[name="q"]', 'Hello World 18');27  await page.fill('input[name="q"]', 'Hello World 19');28  await page.fill('input[name="q"]', 'Hello World 20');29  await page.fill('input[name="q"]', 'Hello World 21');30  await page.fill('input[name="q"]', 'Hello World 22');31  await page.fill('input[name="q"]', 'Hello World 23');32  await page.fill('input[name="q"]

Using AI Code Generation

1const { startWatchingForValueChange } = require('@playwright/test/lib/utils/recorderUtils');2const { chromium } = require('playwright');3const { test, expect } = require('@playwright/test');4test('test', async ({ page }) => {5  await page.click('text="Get started"');6  await page.click('text="API"');7  await page.click('text="Docs"');8  await page.click('text="Test"');9  await page.click('text="Playwright"');10  await page.click('text="GitHub"');11  await page.click('text="Docs"');12  await page.click('text="API"');13  await page.click('text="Get started"');14  await page.click('text="Playwright"');15  await page.click('text="GitHub"');16  await page.click('text="Docs"');17  await page.click('text="API"');18  await page.click('text="Get started"');19  await page.click('text="Playwright"');20  await page.click('text="GitHub"');21  await page.click('text="Docs"');22  await page.click('text="API"');23  await page.click('text="Get started"');24  await page.click('text="Playwright"');25  await page.click('text="GitHub"');26  await page.click('text="Docs"');27  await page.click('text="API"');28  await page.click('text="Get started"');29  await page.click('text="Playwright"');30  await page.click('text="GitHub"');31  await page.click('text="Docs"');32  await page.click('text="API"');33  await page.click('text="Get started"');34  await page.click('text="Playwright"');35  await page.click('text="GitHub"');36  await page.click('text="Docs"');37  await page.click('text="API"');38  await page.click('text="Get started"');39  await page.click('text="Playwright"');40  await page.click('text="GitHub"');41  await page.click('text="Docs"');42  await page.click('text="API"');43  await page.click('text="Get started"');44  await page.click('text="Playwright"');45  await page.click('text="GitHub"');46  await page.click('text="

Using AI Code Generation

1const {startWatchingForValueChange} = require('playwright/lib/server/chromium/crPage');2startWatchingForValueChange(page, {name: 'input'});3page.on('console', msg => console.log(msg.text()));4await page.waitForSelector('input');5const interval = setInterval(async () => {6  const value = await page.$eval('input', el => el.value);7  console.log('Input value: ' + value);8}, 1000);9await page.waitForEvent('valuechanged', event => event.name === 'input');

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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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.
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