Unlock 30% off on Manual Testing Annual Plans this Holiday Season.

Copied to Clipboard!

How to use restoreAfterDispatch method in Playwright Internal

Best JavaScript code snippet using playwright-internal

invokeGuardedCallbackImpl.js

Source:invokeGuardedCallbackImpl.js

...105      const windowEventDescriptor = Object.getOwnPropertyDescriptor(106        window,107        'event',108      );109      function restoreAfterDispatch() {110        // We immediately remove the callback from event listeners so that111        // nested `invokeGuardedCallback` calls do not clash. Otherwise, a112        // nested call would trigger the fake event handlers of any call higher113        // in the stack.114        fakeNode.removeEventListener(evtType, callCallback, false);115        // We check for window.hasOwnProperty('event') to prevent the116        // window.event assignment in both IE <= 10 as they throw an error117        // "Member not found" in strict mode, and in Firefox which does not118        // support window.event.119        if (120          typeof window.event !== 'undefined' &&121          window.hasOwnProperty('event')122        ) {123          window.event = windowEvent;124        }125      }126      // Create an event handler for our fake event. We will synchronously127      // dispatch our fake event using `dispatchEvent`. Inside the handler, we128      // call the user-provided callback.129      const funcArgs = Array.prototype.slice.call(arguments, 3);130      function callCallback() {131        didCall = true;132        restoreAfterDispatch();133        func.apply(context, funcArgs);134        didError = false;135      }136      // Create a global error event handler. We use this to capture the value137      // that was thrown. It's possible that this error handler will fire more138      // than once; for example, if non-React code also calls `dispatchEvent`139      // and a handler for that event throws. We should be resilient to most of140      // those cases. Even if our error event handler fires more than once, the141      // last error event is always used. If the callback actually does error,142      // we know that the last error event is the correct one, because it's not143      // possible for anything else to have happened in between our callback144      // erroring and the code that follows the `dispatchEvent` call below. If145      // the callback doesn't error, but the error event was fired, we know to146      // ignore it because `didError` will be false, as described above.147      let error;148      // Use this to track whether the error event is ever called.149      let didSetError = false;150      let isCrossOriginError = false;151      function handleWindowError(event) {152        error = event.error;153        didSetError = true;154        if (error === null && event.colno === 0 && event.lineno === 0) {155          isCrossOriginError = true;156        }157        if (event.defaultPrevented) {158          // Some other error handler has prevented default.159          // Browsers silence the error report if this happens.160          // We'll remember this to later decide whether to log it or not.161          if (error != null && typeof error === 'object') {162            try {163              error._suppressLogging = true;164            } catch (inner) {165              // Ignore.166            }167          }168        }169      }170      // Create a fake event type.171      const evtType = `react-${name ? name : 'invokeguardedcallback'}`;172      // Attach our event handlers173      window.addEventListener('error', handleWindowError);174      fakeNode.addEventListener(evtType, callCallback, false);175      // Synchronously dispatch our fake event. If the user-provided function176      // errors, it will trigger our global error handler.177      evt.initEvent(evtType, false, false);178      fakeNode.dispatchEvent(evt);179      if (windowEventDescriptor) {180        Object.defineProperty(window, 'event', windowEventDescriptor);181      }182      if (didCall && didError) {183        if (!didSetError) {184          // The callback errored, but the error event never fired.185          error = new Error(186            'An error was thrown inside one of your components, but React ' +187              "doesn't know what it was. This is likely due to browser " +188              'flakiness. React does its best to preserve the "Pause on ' +189              'exceptions" behavior of the DevTools, which requires some ' +190              "DEV-mode only tricks. It's possible that these don't work in " +191              'your browser. Try triggering the error in production mode, ' +192              'or switching to a modern browser. If you suspect that this is ' +193              'actually an issue with React, please file an issue.',194          );195        } else if (isCrossOriginError) {196          error = new Error(197            "A cross-origin error was thrown. React doesn't have access to " +198              'the actual error object in development. ' +199              'See https://reactjs.org/link/crossorigin-error for more information.',200          );201        }202        this.onError(error);203      }204      // Remove our event listeners205      window.removeEventListener('error', handleWindowError);206      if (!didCall) {207        // Something went really wrong, and our event was not dispatched.208        // https://github.com/facebook/react/issues/16734209        // https://github.com/facebook/react/issues/16585210        // Fall back to the production implementation.211        restoreAfterDispatch();212        return invokeGuardedCallbackProd.apply(this, arguments);213      }214    };215  }216}...

Using AI Code Generation

1const { Playwright } = require('playwright');2const { Page } = require('playwright/lib/server/page');3const { Frame } = require('playwright/lib/server/frame');4const { ElementHandle } = require('playwright/lib/server/elementHandler');5const { JSHandle } = require('playwright/lib/server/jsHandle');6const restoreAfterDispatch = (obj, methodName) => {7    const originalMethod = obj[methodName];8    obj[methodName] = function (...args) {9        const result = originalMethod.apply(this, args);10        obj[methodName] = originalMethod;11        return result;12    };13};14const restoreAfterDispatches = (obj, methodNames) => {15    for (const methodName of methodNames) {16        restoreAfterDispatch(obj, methodName);17    }18};19const page = await context.newPage();20await page.setContent('<button>Click me</button>');21const button = await page.$('button');22await button.click();23await page.setContent('<button>Click me</button>');24await button.click();25restoreAfterDispatches(Page.prototype, ['dispatchEvent', 'dispatchEventOnSelector', 'dispatchEventOnElementHandle']);26restoreAfterDispatches(Frame.prototype, ['dispatchEvent', 'dispatchEventOnSelector', 'dispatchEventOnElementHandle']);27restoreAfterDispatches(ElementHandle.prototype, ['dispatchEvent']);28restoreAfterDispatches(JSHandle.prototype, ['evaluateHandle', 'evaluate', 'evaluateExpression']);29restoreAfterDispatches(Playwright.prototype, ['dispatchEvent']);30await button.click();31[Apache 2.0](./LICENSE)

Using AI Code Generation

1const { restoreAfterDispatch } = require('playwright/lib/server/router');2const { BrowserContext } = require('playwright/lib/server/browserContext');3const { Page } = require('playwright/lib/server/page');4restoreAfterDispatch(BrowserContext, 'close', async function (context, route, request) {5  await route.continue();6  console.log('Browser Context Closed');7});8restoreAfterDispatch(Page, 'close', async function (page, route, request) {9  await route.continue();10  console.log('Page Closed');11});12const { restoreAfterDispatch } = require('playwright/lib/server/router');13const { BrowserContext } = require('playwright/lib/server/browserContext');14const { Page } = require('playwright/lib/server/page');15restoreAfterDispatch(BrowserContext, 'close', async function (context, route, request) {16  await route.continue();17  console.log('Browser Context Closed');18});19restoreAfterDispatch(Page, 'close', async function (page, route, request) {20  await route.continue();21  console.log('Page Closed');22});23(async () => {24  await browser.close();25})();26const { restoreAfterDispatch } = require('playwright/lib/server/router');27const { BrowserContext } = require('playwright/lib/server/browserContext');28const { Page } = require('playwright/lib/server/page');29restoreAfterDispatch(BrowserContext, 'close', async function (context, route, request) {30  await route.continue();31  console.log('Browser Context Closed');32});33restoreAfterDispatch(Page, 'close', async function (page, route, request) {34  await route.continue();35  console.log('Page Closed');36});37(async () => {38  await browser.close();39})();40- [Playwright](

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const page = await browser.newPage();5  await page.evaluate(() => {6    window['foo'] = 'bar';7  });8  await page.restoreAfterDispatch(() => {9    window['foo'] = 'baz';10  });11  const fooValue = await page.evaluate(() => window['foo']);12  console.log(fooValue);13  await browser.close();14})();

Using AI Code Generation

1await page.restoreAfterDispatch();2#### page.restoreAfterDispatch()3await page.restoreAfterDispatch();4#### page.restoreAfterDispatch()5await page.restoreAfterDispatch();6#### page.restoreAfterDispatch()7await page.restoreAfterDispatch();8#### page.restoreAfterDispatch()9await page.restoreAfterDispatch();10#### page.restoreAfterDispatch()11await page.restoreAfterDispatch();12#### page.restoreAfterDispatch()13await page.restoreAfterDispatch();14#### page.restoreAfterDispatch()

Using AI Code Generation

1const { context, page } = require('@playwright/test');2const { restoreAfterDispatch } = require('playwright/lib/internal/frames');3const selector = 'input[type="text"]';4const text = 'some text';5(async () => {6  await page.fill(selector, text);7  await restoreAfterDispatch(page, async () => {8    await page.fill(selector, '');9  });10})();

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.