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How to use handleTopLevelImpl method in Playwright Internal

Best JavaScript code snippet using playwright-internal

ReactEventTopLevelCallback.js

...53 * @param {string} topLevelType54 * @param {DOMEvent} nativeEvent55 * @param {TopLevelCallbackBookKeeping} bookKeeping56 */57function handleTopLevelImpl(topLevelType, nativeEvent, bookKeeping) {58  var topLevelTarget = ReactMount.getFirstReactDOM(59    getEventTarget(nativeEvent)60  ) || window;61  // Loop through the hierarchy, in case there's any nested components.62  // It's important that we build the array of ancestors before calling any63  // event handlers, because event handlers can modify the DOM, leading to64  // inconsistencies with ReactMount's node cache. See #1105.65  var ancestor = topLevelTarget;66  while (ancestor) {67    bookKeeping.ancestors.push(ancestor);68    ancestor = findParent(ancestor);69  }70  for (var i = 0, l = bookKeeping.ancestors.length; i < l; i++) {71    topLevelTarget = bookKeeping.ancestors[i];72    var topLevelTargetID = ReactMount.getID(topLevelTarget) || '';73    ReactEventEmitter.handleTopLevel(74      topLevelType,75      topLevelTarget,76      topLevelTargetID,77      nativeEvent78    );79  }80}81// Used to store ancestor hierarchy in top level callback82function TopLevelCallbackBookKeeping() {83  this.ancestors = [];84}85mixInto(TopLevelCallbackBookKeeping, {86  destructor: function() {87    this.ancestors.length = 0;88  }89});90PooledClass.addPoolingTo(TopLevelCallbackBookKeeping);91/**92 * Top-level callback creator used to implement event handling using delegation.93 * This is used via dependency injection.94 */95var ReactEventTopLevelCallback = {96  /**97   * Sets whether or not any created callbacks should be enabled.98   *99   * @param {boolean} enabled True if callbacks should be enabled.100   */101  setEnabled: function(enabled) {102    _topLevelListenersEnabled = !!enabled;103  },104  /**105   * @return {boolean} True if callbacks are enabled.106   */107  isEnabled: function() {108    return _topLevelListenersEnabled;109  },110  /**111   * Creates a callback for the supplied `topLevelType` that could be added as112   * a listener to the document. The callback computes a `topLevelTarget` which113   * should be the root node of a mounted React component where the listener114   * is attached.115   *116   * @param {string} topLevelType Record from `EventConstants`.117   * @return {function} Callback for handling top-level events.118   */119  createTopLevelCallback: function(topLevelType) {120    return function(nativeEvent) {121      if (!_topLevelListenersEnabled) {122        return;123      }124      var bookKeeping = TopLevelCallbackBookKeeping.getPooled();125      try {126        handleTopLevelImpl(topLevelType, nativeEvent, bookKeeping);127      } finally {128        TopLevelCallbackBookKeeping.release(bookKeeping);129      }130    };131  }132};...

ReactEventListener.js

Source: ReactEventListener.js

...27      this.nativeEvent = null;28      this.ancestors.length = 0;29    }});30  PooledClass.addPoolingTo(TopLevelCallbackBookKeeping, PooledClass.twoArgumentPooler);31  function handleTopLevelImpl(bookKeeping) {32    var topLevelTarget = ReactMount.getFirstReactDOM(getEventTarget(bookKeeping.nativeEvent)) || window;33    var ancestor = topLevelTarget;34    while (ancestor) {35      bookKeeping.ancestors.push(ancestor);36      ancestor = findParent(ancestor);37    }38    for (var i = 0,39        l = bookKeeping.ancestors.length; i < l; i++) {40      topLevelTarget = bookKeeping.ancestors[i];41      var topLevelTargetID = ReactMount.getID(topLevelTarget) || '';42      ReactEventListener._handleTopLevel(bookKeeping.topLevelType, topLevelTarget, topLevelTargetID, bookKeeping.nativeEvent);43    }44  }45  function scrollValueMonitor(cb) {...

Using AI Code Generation

1const { handleTopLevelImpl } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');2const { Page } = require('playwright/lib/server/page.js');3const { Frame } = require('playwright/lib/server/frame.js');4const page = new Page(null, null, null, null);5const frame = new Frame(page, null, null);6handleTopLevelImpl(frame, 'click', {x: 100, y: 100}, {modifiers: 0, button: 'left', clickCount: 1, force: false, noWaitAfter: false, position: {x: 100, y: 100}, timeout: 30000, trial: false}, null, null);7handleTopLevelImpl(page, 'click', {x: 100, y: 100}, {modifiers: 0, button: 'left', clickCount: 1, force: false, noWaitAfter: false, position: {x: 100, y: 100}, timeout: 30000, trial: false}, null, null);8handleTopLevelImpl(frame, 'click', {x: 100, y: 100}, {modifiers: 0, button: 'left', clickCount: 1, force: false, noWaitAfter: false, position: {x: 100, y: 100}, timeout: 30000, trial: false}, null, null);9handleTopLevelImpl(page, 'click', {x: 100, y: 100}, {modifiers: 0, button: 'left', clickCount: 1, force: false, noWaitAfter: false, position: {x: 100, y: 100}, timeout: 30000, trial: false}, null, null);10handleTopLevelImpl(frame, 'click', {x: 100, y: 100}, {modifiers: 0, button: 'left', clickCount: 1, force: false, noWaitAfter

Using AI Code Generation

1const { Playwright } = require('playwright-core/lib/server/playwright.js');2const { handleTopLevelImpl } = require('playwright-core/lib/server/browserType.js');3const { Browser } = require('playwright-core/lib/server/browser.js');4const { BrowserContext } = require('playwright-core/lib/server/browserContext.js');5const { Page } = require('playwright-core/lib/server/page.js');6const playwright = new Playwright();7const browserType = playwright.chromium;8const browser = await browserType.launch();9const context = await browser.newContext();10const page = await context.newPage();11await handleTopLevelImpl.call(browserType, browser, context, page);12await browser.close();13await playwright.stop();14const { Playwright } = require('playwright-core/lib/server/playwright.js');15const { handleTopLevelImpl } = require('playwright-core/lib/server/browserType.js');16const { Browser } = require('playwright-core/lib/server/browser.js');17const { BrowserContext } = require('playwright-core/lib/server/browserContext.js');18const { Page } = require('playwright-core/lib/server/page.js');19const playwright = new Playwright();20const browserType = playwright.chromium;21const browser = await browserType.launch();22const context = await browser.newContext();23const page = await context.newPage();24await handleTopLevelImpl.call(browserType, browser, context, page);25await browser.close();26await playwright.stop();

Using AI Code Generation

1const { handleTopLevelImpl } = require('playwright/lib/server/frames');2const fs = require('fs');3const path = require('path');4const { chromium } = require('playwright');5const { promisify } = require('util');6const sleep = promisify(setTimeout);7(async () => {8  const browser = await chromium.launch();9  const context = await browser.newContext();10  const page = await context.newPage();11  const frame = page.mainFrame();12  const frameHandle = await frame._page._delegate._frameManager.frame(frame._id)._mainContext();13  const handle = await frame.$('input');14  const elementHandle = await handle._context._adoptBackendNodeId(handle._remoteObject.backendNodeId);15  const buttonHandle = await frame.$('button');16  const buttonElementHandle = await buttonHandle._context._adoptBackendNodeId(buttonHandle._remoteObject.backendNodeId);17  const buttonHandle = await frame.$('button');18  const buttonElementHandle = await buttonHandle._context._adoptBackendNodeId(buttonHandle._remoteObject.backendNodeId);19  const fileHandle = await frame.$('input[type="file"]');20  const fileElementHandle = await fileHandle._context._adoptBackendNodeId(fileHandle._remoteObject.backendNodeId);21  const filePath = path.join(__dirname, 'test.txt');22  await frame.setInputFiles(fileElementHandle, filePath);23  const file = await frame.evaluateHandle(element => element.files[0], fileElementHandle);24  const fileName = await frame.evaluate(element => element.files[0].name, fileElementHandle);25  const fileSize = await frame.evaluate(element => element.files[0].size, fileElementHandle);26  const fileType = await frame.evaluate(element => element.files[0].type, fileElementHandle);

Using AI Code Generation

1const { handleTopLevelImpl } = require('playwright/lib/server/chromium/crPage');2const { Page } = require('playwright/lib/server/chromium/crPage');3const { helper } = require('playwright/lib/helper');4const { assert } = require('playwright/lib/utils/utils');5const { chromium } = require('playwright');6(async () => {7  const browser = await chromium.launch({ headless: false });8  const context = await browser.newContext();9  const page = await context.newPage();10  const frame = page.mainFrame();11  const handle = await frame.waitForSelector('#main-content');12  const element = await handle.asElement();13  const result = await handleTopLevelImpl.call(element, 'click', 'left');14  console.log(result);15})();16    at CDPSession._onMessage (/home/username/playwright/node_modules/playwright/lib/cjs/server/cjs/chromium/crConnection.js:34:55)17    at CDPSession.emit (events.js:315:20)18    at CDPSession._onMessage (/home/username/playwright/node_modules/playwright/lib/cjs/server/cjs/chromium/crConnection.js:34:55)19    at CDPSession.emit (events.js:315:20)20    at CDPSession._onMessage (/home/username/playwright/node_modules/playwright/lib/cjs/server/cjs/chromium/crConnection.js:34:55)21    at CDPSession.emit (events.js:315:20)22    at CDPSession._onMessage (/home/username/playwright/node_modules/playwright/lib/cjs/server/cjs/chromium/crConnection.js:34:55)23    at CDPSession.emit (events.js:315:20)24    at Connection._onMessage (/home/username/playwright/node_modules/playwright/lib/cjs/server/cjs/chromium/crConnection.js:34:55)25    at Connection.emit (events.js:315:20)

Using AI Code Generation

1const { handleTopLevelImpl } = require('playwright/lib/server/dom.js');2const { ElementHandle } = require('playwright/lib/server/dom.js');3const { JSHandle } = require('playwright/lib/server/dom.js');4const { Page } = require('playwright/lib/server/page.js');5const { helper } = require('playwright/lib/helper.js');6const { assert } = require('playwright/lib/helper.js');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  const elementHandle = await page.$('div#SIvCob');13  const box = await elementHandle.boundingBox();14  console.log(box);15  const x = box.x + box.width / 2;16  const y = box.y + box.height / 2;17  await page.mouse.move(x, y);18  await page.mouse.down();19  await page.mouse.up();20  await browser.close();21})();22const { JSHandle } = require('./jsHandle.js');23const { helper } = require('../helper.js');24const { assert } = require('../helper.js');25const { Page } = require('./page.js');26class ElementHandle extends JSHandle {27  constructor(context, client, remoteObject, page) {28    super(context, client, remoteObject);29    this._page = page;30  }31  async hover() {32    await this._scrollIntoViewIfNeeded();33    const { backendNodeId } = await this._client.send('DOM.describeNode', {34    });35    await this._client.send('DOM.highlightNode', {36      highlightConfig: { showInfo: true },37    });38    await this._page.mouse.move(0, 0);39    await this._client.send('DOM.hideHighlight');40  }41  async click(options = {}) {42    await this._scrollIntoViewIfNeeded();43    await this._page.mouse.click(options.x, options.y, options);44  }45  async tap() {46    await this._scrollIntoViewIfNeeded();47    await this._page.touchscreen.tap(0, 0);48  }49  async focus() {50    await this._client.send('DOM.focus', {

Using AI Code Generation

1const { _electron } = require(“playwright-core/lib/server/electron.js”);2_electron.handleTopLevelImpl = async function handleTopLevelImpl(3) {4  console.log(“handleTopLevelImpl”);5  const context = page.context();6  const interceptedRequest = new InterceptedRequest(7  );8  context.emit(“request”, interceptedRequest);9  await interceptedRequest._waitForContinue();10};11const path = require(“path”);12module.exports = {13  testDir: path.join(__dirname, “test”),14  use: {15    electron: {16    },17  },18};19const { test, expect } = require(“@playwright/test”);20test(“test”, async ({ page }) => {21});22const { test, expect } = require(“@playwright/test”);23test(“test”, async ({ page }) => {24});25const { test, expect } = require(“@playwright/test”);26test(“test”, async ({ page }) => {27});28const { test, expect } = require(“

Using AI Code Generation

1const { handleTopLevelImpl } = require('playwright/lib/client/frames');2const frame = await page.mainFrame();3const context = await frame.executionContext();4const handle = await context.evaluateHandle(() => document);5const topLevelHandle = await handleTopLevelImpl(handle);6const topLevelFrame = topLevelHandle._object._frame;7const topLevelFrameUrl = topLevelFrame.url();8const topLevelFrameName = topLevelFrame.name();9console.log('top level frame url: ', topLevelFrameUrl);10console.log('top level frame name: ', topLevelFrameName);11await browser.close();

StackOverFlow community discussions

Questions

Discussion

Jest + Playwright - Test callbacks of event-based DOM library

Is it possible to get the selector from a locator object in playwright?

firefox browser does not start in playwright

Running Playwright in Azure Function

How to run a list of test suites in a single file concurrently in jest?

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

Well this is one way, but not sure if it will work for all possible locators!.

// Get a selector from a playwright locator
import { Locator } from "@playwright/test";
export function extractSelector(locator: Locator) {
    const selector = locator.toString();
    const parts = selector.split("@");
    if (parts.length !== 2) { throw Error("extractSelector: susupect that this is not a locator"); }
    if (parts[0] !== "Locator") { throw Error("extractSelector: did not find locator"); }
    return parts[1];
}

https://stackoverflow.com/questions/72044959/is-it-possible-to-get-the-selector-from-a-locator-object-in-playwright

I found the error. It was because of some missing libraries need. I discovered this when I downgraded playwright to version 1.9 and ran the the code then this was the error msg:

(node:12876) UnhandledPromiseRejectionWarning: browserType.launch: Host system is missing dependencies!

Some of the Universal C Runtime files cannot be found on the system. You can fix
that by installing Microsoft Visual C++ Redistributable for Visual Studio from:
https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads

Full list of missing libraries:
    vcruntime140.dll
    msvcp140.dll
Error
    at Object.captureStackTrace (D:\Projects\snkrs-play\node_modules\playwright\lib\utils\stackTrace.js:48:19)
    at Connection.sendMessageToServer (D:\Projects\snkrs-play\node_modules\playwright\lib\client\connection.js:69:48)
    at Proxy.<anonymous> (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:64:61)
    at D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:64:67
    at BrowserType._wrapApiCall (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:77:34)
    at BrowserType.launch (D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:55:21)
    at D:\Projects\snkrs-play\index.js:4:35
    at Object.<anonymous> (D:\Projects\snkrs-play\index.js:7:3)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:12876) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:12876) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

A list of missing libraries was provided. After successful installments, firefox ran fine. I upgraded again to version 1.10 and firefox still works.

https://stackoverflow.com/questions/66984974/firefox-browser-does-not-start-in-playwright

Assuming you are not running test with the --runinband flag, the simple answer is yes but it depends ????

There is a pretty comprehensive GitHub issue jest#6957 that explains certain cases of when tests are run concurrently or in parallel. But it seems to depend on a lot of edge cases where jest tries its best to determine the fastest way to run the tests given the circumstances.

To my knowledge there is no way to force jest to run in parallel.

Aside

Have you considered using playwright instead of puppeteer with jest? Playwright has their own internally built testing library called @playwright/test that is used in place of jest with a similar API. This library allows for explicitly defining test groups in a single file to run in parallel (i.e. test.describe.parallel) or serially (i.e. test.describe.serial). Or even to run all tests in parallel via a config option.

// parallel
test.describe.parallel('group', () => {
  test('runs in parallel 1', async ({ page }) => {});
  test('runs in parallel 2', async ({ page }) => {});
});

// serial
test.describe.serial('group', () => {
  test('runs first', async ({ page }) => {});
  test('runs second', async ({ page }) => {});
});

https://stackoverflow.com/questions/73497773/how-to-run-a-list-of-test-suites-in-a-single-file-concurrently-in-jest

I found the error. It was because of some missing libraries need. I discovered this when I downgraded playwright to version 1.9 and ran the the code then this was the error msg:

(node:12876) UnhandledPromiseRejectionWarning: browserType.launch: Host system is missing dependencies!

Some of the Universal C Runtime files cannot be found on the system. You can fix
that by installing Microsoft Visual C++ Redistributable for Visual Studio from:
https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads

Full list of missing libraries:
    vcruntime140.dll
    msvcp140.dll
Error
    at Object.captureStackTrace (D:\Projects\snkrs-play\node_modules\playwright\lib\utils\stackTrace.js:48:19)
    at Connection.sendMessageToServer (D:\Projects\snkrs-play\node_modules\playwright\lib\client\connection.js:69:48)
    at Proxy.<anonymous> (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:64:61)
    at D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:64:67
    at BrowserType._wrapApiCall (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:77:34)
    at BrowserType.launch (D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:55:21)
    at D:\Projects\snkrs-play\index.js:4:35
    at Object.<anonymous> (D:\Projects\snkrs-play\index.js:7:3)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:12876) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:12876) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

A list of missing libraries was provided. After successful installments, firefox ran fine. I upgraded again to version 1.10 and firefox still works.

https://stackoverflow.com/questions/66984974/firefox-browser-does-not-start-in-playwright

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