How to use findHostInstanceWithNoPortals method in Playwright Internal

Best JavaScript code snippet using playwright-internal

ReactDOMRoot.js

Source: ReactDOMRoot.js Github

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...65 );66 }67 const container = root.containerInfo;68 if (container.nodeType !== COMMENT_NODE) {69 const hostInstance = findHostInstanceWithNoPortals(root.current);70 if (hostInstance) {71 if (hostInstance.parentNode !== container) {72 console.error(73 'render(...): It looks like the React-rendered content of the ' +74 'root container was removed without using React. This is not ' +75 'supported and will cause errors. Instead, call ' +76 "root.unmount() to empty a root's container.",77 );78 }79 }80 }81 }82 updateContainer(children, root, null, null);83};...

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ReactFiberReconciler.js

Source: ReactFiberReconciler.js Github

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1/​**2 * Copyright (c) Facebook, Inc. and its affiliates.3 *4 * This source code is licensed under the MIT license found in the5 * LICENSE file in the root directory of this source tree.6 *7 * @flow8 */​9import {enableNewReconciler} from 'shared/​ReactFeatureFlags';10/​/​ The entry file imports either the old or new version of the reconciler.11/​/​ During build and testing, this indirection is always shimmed with the actual12/​/​ modules, otherwise both reconcilers would be initialized. So this is really13/​/​ only here for Flow purposes.14import {15 createContainer as createContainer_old,16 updateContainer as updateContainer_old,17 batchedEventUpdates as batchedEventUpdates_old,18 batchedUpdates as batchedUpdates_old,19 unbatchedUpdates as unbatchedUpdates_old,20 deferredUpdates as deferredUpdates_old,21 syncUpdates as syncUpdates_old,22 discreteUpdates as discreteUpdates_old,23 flushDiscreteUpdates as flushDiscreteUpdates_old,24 flushControlled as flushControlled_old,25 flushSync as flushSync_old,26 flushPassiveEffects as flushPassiveEffects_old,27 IsThisRendererActing as IsThisRendererActing_old,28 getPublicRootInstance as getPublicRootInstance_old,29 attemptSynchronousHydration as attemptSynchronousHydration_old,30 attemptUserBlockingHydration as attemptUserBlockingHydration_old,31 attemptContinuousHydration as attemptContinuousHydration_old,32 attemptHydrationAtCurrentPriority as attemptHydrationAtCurrentPriority_old,33 findHostInstance as findHostInstance_old,34 findHostInstanceWithWarning as findHostInstanceWithWarning_old,35 findHostInstanceWithNoPortals as findHostInstanceWithNoPortals_old,36 shouldSuspend as shouldSuspend_old,37 injectIntoDevTools as injectIntoDevTools_old,38 act as act_old,39 createPortal as createPortal_old,40} from './​ReactFiberReconciler.old';41/​/​ TODO: Update these to point to the fork.42import {43 createContainer as createContainer_new,44 updateContainer as updateContainer_new,45 batchedEventUpdates as batchedEventUpdates_new,46 batchedUpdates as batchedUpdates_new,47 unbatchedUpdates as unbatchedUpdates_new,48 deferredUpdates as deferredUpdates_new,49 syncUpdates as syncUpdates_new,50 discreteUpdates as discreteUpdates_new,51 flushDiscreteUpdates as flushDiscreteUpdates_new,52 flushControlled as flushControlled_new,53 flushSync as flushSync_new,54 flushPassiveEffects as flushPassiveEffects_new,55 IsThisRendererActing as IsThisRendererActing_new,56 getPublicRootInstance as getPublicRootInstance_new,57 attemptSynchronousHydration as attemptSynchronousHydration_new,58 attemptUserBlockingHydration as attemptUserBlockingHydration_new,59 attemptContinuousHydration as attemptContinuousHydration_new,60 attemptHydrationAtCurrentPriority as attemptHydrationAtCurrentPriority_new,61 findHostInstance as findHostInstance_new,62 findHostInstanceWithWarning as findHostInstanceWithWarning_new,63 findHostInstanceWithNoPortals as findHostInstanceWithNoPortals_new,64 shouldSuspend as shouldSuspend_new,65 injectIntoDevTools as injectIntoDevTools_new,66 act as act_new,67 createPortal as createPortal_new,68} from './​ReactFiberReconciler.old';69export const createContainer = enableNewReconciler70 ? createContainer_new71 : createContainer_old;72export const updateContainer = enableNewReconciler73 ? updateContainer_new74 : updateContainer_old;75export const batchedEventUpdates = enableNewReconciler76 ? batchedEventUpdates_new77 : batchedEventUpdates_old;78export const batchedUpdates = enableNewReconciler79 ? batchedUpdates_new80 : batchedUpdates_old;81export const unbatchedUpdates = enableNewReconciler82 ? unbatchedUpdates_new83 : unbatchedUpdates_old;84export const deferredUpdates = enableNewReconciler85 ? deferredUpdates_new86 : deferredUpdates_old;87export const syncUpdates = enableNewReconciler88 ? syncUpdates_new89 : syncUpdates_old;90export const discreteUpdates = enableNewReconciler91 ? discreteUpdates_new92 : discreteUpdates_old;93export const flushDiscreteUpdates = enableNewReconciler94 ? flushDiscreteUpdates_new95 : flushDiscreteUpdates_old;96export const flushControlled = enableNewReconciler97 ? flushControlled_new98 : flushControlled_old;99export const flushSync = enableNewReconciler ? flushSync_new : flushSync_old;100export const flushPassiveEffects = enableNewReconciler101 ? flushPassiveEffects_new102 : flushPassiveEffects_old;103export const IsThisRendererActing = enableNewReconciler104 ? IsThisRendererActing_new105 : IsThisRendererActing_old;106export const getPublicRootInstance = enableNewReconciler107 ? getPublicRootInstance_new108 : getPublicRootInstance_old;109export const attemptSynchronousHydration = enableNewReconciler110 ? attemptSynchronousHydration_new111 : attemptSynchronousHydration_old;112export const attemptUserBlockingHydration = enableNewReconciler113 ? attemptUserBlockingHydration_new114 : attemptUserBlockingHydration_old;115export const attemptContinuousHydration = enableNewReconciler116 ? attemptContinuousHydration_new117 : attemptContinuousHydration_old;118export const attemptHydrationAtCurrentPriority = enableNewReconciler119 ? attemptHydrationAtCurrentPriority_new120 : attemptHydrationAtCurrentPriority_old;121export const findHostInstance = enableNewReconciler122 ? findHostInstance_new123 : findHostInstance_old;124export const findHostInstanceWithWarning = enableNewReconciler125 ? findHostInstanceWithWarning_new126 : findHostInstanceWithWarning_old;127export const findHostInstanceWithNoPortals = enableNewReconciler128 ? findHostInstanceWithNoPortals_new129 : findHostInstanceWithNoPortals_old;130export const shouldSuspend = enableNewReconciler131 ? shouldSuspend_new132 : shouldSuspend_old;133export const injectIntoDevTools = enableNewReconciler134 ? injectIntoDevTools_new135 : injectIntoDevTools_old;136export const act = enableNewReconciler ? act_new : act_old;137export const createPortal = enableNewReconciler138 ? createPortal_new...

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Using AI Code Generation

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1const { chromium } = require('playwright');2(async () => {3 const browser = await chromium.launch({ headless: false });4 const page = await browser.newPage();5 const elementHandle = await page.$('text=Get started');6 const hostInstance = await elementHandle._context.findHostInstanceWithNoPortals(elementHandle);7 console.log(hostInstance);8 await browser.close();9})();10Your name to display (optional):11Your name to display (optional):12const { chromium } = require('playwright');13(async () => {14 const browser = await chromium.launch({ headless: false });15 const page = await browser.newPage();16 await page.waitForLoadState();17 const elementHandle = await page.$('text=Get started');18 const hostInstance = await elementHandle._context.findHostInstanceWithNoPortals(elementHandle);19 console.log(hostInstance);20 await browser.close();21})();22Your name to display (optional):

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Using AI Code Generation

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1const { chromium } = require('playwright');2(async () => {3 const browser = await chromium.launch();4 const page = await browser.newPage();5 const elementHandle = await page.$('text=Get started');6 const host = await page.findHostInstanceWithNoPortals(elementHandle);7 console.log(host);8 await browser.close();9})();10ElementHandle {11 _context: BrowserContext {12 _browser: Browser {13 _connection: Connection {14 _callbacksPending: Set(0) {},15 _callbacksPending: Set(0) {},16 _callbacksPending: Set(0) {},17 _callbacksPending: Set(0) {},18 _callbacksPending: Set(0) {},19 _callbacksPending: Set(0) {},20 _callbacksPending: Set(0) {},21 _callbacksPending: Set(0) {},22 _callbacksPending: Set(0) {},23 _callbacksPending: Set(0

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Using AI Code Generation

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1const playwright = require('playwright');2(async () => {3 const browser = await playwright.chromium.launch();4 const page = await browser.newPage();5 await page.click('text=Get started');6 const elementHandle = await page.$('text=Get started');7 const host = await elementHandle._internalApi.findHostInstance();8 console.log(host);9 await browser.close();10})();11{ type: 'node',12 attributes: { 'data-testid': 'get-started-btn' },13 children: [ { type: 'text', name: 'Get started', value: 'Get started' } ] }

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Using AI Code Generation

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1const { findHostInstanceWithNoPortals } = require('playwright/​lib/​server/​dom');2const { chromium } = require('playwright');3(async () => {4 const browser = await chromium.launch({ headless: false });5 const context = await browser.newContext();6 const page = await context.newPage();7 const element = await page.$('text=Page');8 const host = findHostInstanceWithNoPortals(element);9 console.log(host);10 await browser.close();11})();12{13 _page: Page {14 },15 _parentFrame: Frame {16 },17 _context: ExecutionContext {

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Using AI Code Generation

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1const { findHostInstanceWithNoPortals } = require('playwright/​lib/​server/​supplements/​recorder/​recorderSupplement');2const { chromium } = require('playwright');3const path = require('path');4(async () => {5 const browser = await chromium.launch();6 const context = await browser.newContext();7 const page = await context.newPage();8 const element = await page.$('input');9 const hostInstance = findHostInstanceWithNoPortals(element);10 console.log(hostInstance);11 await browser.close();12})();13{ _guid: '0x3F3',14 { description: 'input#lst-ib.gsfi',15 objectId: '{"injectedScriptId":2,"id":1}',16 { type: 'node',17 childNodeCount: 0 } } }18const { findHostInstanceWithNoPortals } = require('playwright-chromium/​lib/​server/​supplements/​recorder/​recorderSupplement');19const { chromium } = require('playwright');20(async () => {21 const browser = await chromium.launch();22 const context = await browser.newContext();23 const page = await context.newPage();24 const element = await page.$('input');25 console.log(element);26 await browser.close();27})();28ElementHandle {

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Using AI Code Generation

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1const { findHostInstanceWithNoPortals } = require('playwright/​lib/​server/​supplements/​recorder/​recorderSupplement.js');2const hostInstance = findHostInstanceWithNoPortals(document.body);3console.log(hostInstance);4const { findHostInstanceWithNoPortals } = require('playwright/​lib/​server/​supplements/​recorder/​recorderSupplement.js');5const hostInstance = findHostInstanceWithNoPortals(document.body);6console.log(hostInstance);

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Using AI Code Generation

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1const { findHostInstanceWithNoPortals } = require('playwright/​lib/​server/​dom.js');2const host = findHostInstanceWithNoPortals(document.querySelector('#elementId'));3const host = findHostInstanceWithNoPortals(document.querySelector('#elementId'));4const host = findHostInstanceWithNoPortals(document.querySelector('#elementId'));5const host = findHostInstanceWithNoPortals(document.querySelector('#elementId'));6const host = findHostInstanceWithNoPortals(document.querySelector('#elementId'));7const host = findHostInstanceWithNoPortals(document.querySelector('#elementId'));8const host = findHostInstanceWithNoPortals(document.querySelector('#elementId'));9const host = findHostInstanceWithNoPortals(document.querySelector('#elementId'));10const host = findHostInstanceWithNoPortals(document.querySelector('#elementId'));11const host = findHostInstanceWithNoPortals(document.querySelector('#elementId'));12const host = findHostInstanceWithNoPortals(document.querySelector('#elementId'));13const host = findHostInstanceWithNoPortals(document.querySelector('#elementId'));14const host = findHostInstanceWithNoPortals(document.querySelector('#elementId'));

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Using AI Code Generation

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1const { findHostInstanceWithNoPortals } = require('playwright/​lib/​server/​frames');2const frame = page.frames()[0];3const element = await findHostInstanceWithNoPortals(frame, selector);4const { findHostInstanceWithNoPortals } = require('playwright/​lib/​server/​frames');5const frame = page.frames()[0];6const element = await findHostInstanceWithNoPortals(frame, selector);7const { findHostInstanceWithNoPortals } = require('playwright/​lib/​server/​frames');8const frame = page.frames()[0];9const element = await findHostInstanceWithNoPortals(frame, selector);10const { findHostInstanceWithNoPortals } = require('playwright/​lib/​server/​frames');11const frame = page.frames()[0];12const element = await findHostInstanceWithNoPortals(frame, selector);13const { findHostInstanceWithNoPortals } = require('playwright/​lib/​server/​frames');14const frame = page.frames()[0];15const element = await findHostInstanceWithNoPortals(frame, selector);16const { findHostInstanceWithNoPortals } = require('playwright/​lib/​server/​frames');17const frame = page.frames()[0];18const element = await findHostInstanceWithNoPortals(frame, selector);19const { findHostInstanceWithNoPortals } = require('playwright/​lib/​server/​frames');20const frame = page.frames()[0];21const element = await findHostInstanceWithNoPortals(frame, selector);22const { findHostInstanceWithNoPortals } = require('playwright/​lib/​server/​frames');23const frame = page.frames()[0];24const element = await findHostInstanceWithNoPortals(frame, selector);25const { findHostInstanceWithNoPortals

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StackOverFlow community discussions

Questions
Discussion

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
})
https://stackoverflow.com/questions/65477895/jest-playwright-test-callbacks-of-event-based-dom-library

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