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})();
Jest + Playwright - Test callbacks of event-based DOM library
firefox browser does not start in playwright
Is it possible to get the selector from a locator object in playwright?
How to run a list of test suites in a single file concurrently in jest?
Running Playwright in Azure Function
firefox browser does not start in playwright
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
})
Check out the latest blogs from LambdaTest on this topic:
Native apps are developed specifically for one platform. Hence they are fast and deliver superior performance. They can be downloaded from various app stores and are not accessible through browsers.
One of the essential parts when performing automated UI testing, whether using Selenium or another framework, is identifying the correct web elements the tests will interact with. However, if the web elements are not located correctly, you might get NoSuchElementException in Selenium. This would cause a false negative result because we won’t get to the actual functionality check. Instead, our test will fail simply because it failed to interact with the correct element.
Smartphones have changed the way humans interact with technology. Be it travel, fitness, lifestyle, video games, or even services, it’s all just a few touches away (quite literally so). We only need to look at the growing throngs of smartphone or tablet users vs. desktop users to grasp this reality.
As part of one of my consulting efforts, I worked with a mid-sized company that was looking to move toward a more agile manner of developing software. As with any shift in work style, there is some bewilderment and, for some, considerable anxiety. People are being challenged to leave their comfort zones and embrace a continuously changing, dynamic working environment. And, dare I say it, testing may be the most ‘disturbed’ of the software roles in agile development.
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.
Get 100 minutes of automation test minutes FREE!!