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How to use insertLazyTreeChildAt method in Playwright Internal

Best JavaScript code snippet using playwright-internal

react_path.js

...6      var update = updates[k]7      switch (update.type) {8        // æå¥æ°çèç¹9        case ReactMultiChildUpdateTypes.INSERT_MARKUP:10          insertLazyTreeChildAt(11            parentNode,12            update.content,13            getNodeAfter(parentNode, update.afterNode)14          )15          break16        // éè¦ç§»å¨çèç¹17        case ReactMultiChildUpdateTypes.MOVE_EXISTING:18          moveChild(19            parentNode,20            update.fromNode,21            getNodeAfter(parentNode, update.afterNode)22          )23          break24        case ReactMultiChildUpdateTypes.SET_MARKUP:25          setInnerHTML(parentNode, update.content)26          break27        case ReactMultiChildUpdateTypes.TEXT_CONTENT:28          setTextContent(parentNode, update.content)29          break30        // éè¦å é¤çèç¹31        case ReactMultiChildUpdateTypes.REMOVE_NODE:32          removeChild(parentNode, update.fromNode)33          break34      }35    }36  }37}38function getNodeAfter(parentNode, node) {39  // ææ¬ç»ä»¶çè¿åæ ¼å¼ [open, close] commentsï¼éè¦åç¹æ®å¤ç40  if (Array.isArray(node)) {41    node = node[1]42  }43  return node ? node.nextSibling : parentNode.firstChild44}45// æå¥æ°èç¹çæä½46function insertLazyTreeChildAt(parentNode, childTree, referenceNode) {47  DOMLazyTree.insertTreeBefore(parentNode, childTree, referenceNode)48}49// ç§»å¨å·²æèç¹çæä½50function moveChild(parentNode, childNode, referenceNode) {51  if (Array.isArray(childNode)) {52    moveDelimitedText(parentNode, childNode[0], childNode[1], referenceNode)53  } else {54    insertChildAt(parentNode, childNode, referenceNode)55  }56}57// ç§»é¤å·²æèç¹çæä½58function removeChild(parentNode, childNode) {59  if (Array.isArray(childNode)) {60    var closingComment = childNode[1]...

DOMChildrenOperations.js

Source: DOMChildrenOperations.js

...31  // `appendChild(node)`. (Using `undefined` is not allowed by all browsers so32  // we are careful to use `null`.)33  parentNode.insertBefore(childNode, referenceNode);34}35function insertLazyTreeChildAt(parentNode, childTree, referenceNode) {36  DOMLazyTree.insertTreeBefore(parentNode, childTree, referenceNode);37}38/**39 * Operations for updating with DOM children.40 */41var DOMChildrenOperations = {42  dangerouslyReplaceNodeWithMarkup: Danger.dangerouslyReplaceNodeWithMarkup,43  updateTextContent: setTextContent,44  /**45   * Updates a component's children by processing a series of updates. The46   * update configurations are each expected to have a `parentNode` property.47   *48   * @param {array<object>} updates List of update configurations.49   * @internal50   */51  processUpdates: function(parentNode, updates) {52    for (var k = 0; k < updates.length; k++) {53      var update = updates[k];54      switch (update.type) {55        case ReactMultiChildUpdateTypes.INSERT_MARKUP:56          insertLazyTreeChildAt(57            parentNode,58            update.content,59            getNodeAfter(parentNode, update.afterNode)60          );61          break;62        case ReactMultiChildUpdateTypes.MOVE_EXISTING:63          insertChildAt(64            parentNode,65            update.fromNode,66            getNodeAfter(parentNode, update.afterNode)67          );68          break;69        case ReactMultiChildUpdateTypes.SET_MARKUP:70          setInnerHTML(...

Using AI Code Generation

1const { chromium } = require('playwright');2const fs = require('fs');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  await page.waitForSelector('text="Docs"');8  const elementHandle = await page.$('text="Docs"');9  const element = await elementHandle.asElement();10  const internalAPI = element._delegate;11  const elementBox = await internalAPI.boundingBox();12  const html = fs.readFileSync('test.html', 'utf8');13  const frame = await internalAPI._page._delegate._frameManager.frame(elementHandle._contextId);14  await frame.insertLazyTreeChildAt(elementBox.x + 10, elementBox.y + 10, html);15  await page.screenshot({ path: 'test.png' });16  await browser.close();17})();18const { chromium } = require('playwright');19const fs = require('fs');20(async () => {21  const browser = await chromium.launch();22  const context = await browser.newContext();23  const page = await context.newPage();24  await page.waitForSelector('text="Docs"');25  const elementHandle = await page.$('text="Docs"');26  const element = await elementHandle.asElement();27  const internalAPI = element._delegate;28  const elementBox = await internalAPI.boundingBox();29  const html = fs.readFileSync('test.html', 'utf8');30  const frame = await internalAPI._page._delegate._frameManager.frame(elementHandle._contextId);31  await frame.insertLazyTreeChildAt(elementBox.x + 10, elementBox.y + 10, html);32  await page.screenshot({ path: 'test.png' });33  await browser.close();34})();

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch({ headless: false });4  const page = await browser.newPage();5  await page.waitForSelector('text=Get started');6  const elementHandle = await page.$('text=Get started');7  const internalAPI = page._delegate;8  await page.waitForSelector('text=Playwright API Docs');9  await browser.close();10})();11const { chromium } = require('playwright');12(async () => {13  const browser = await chromium.launch({ headless: false });14  const page = await browser.newPage();15  await page.waitForSelector('text=Get started');16  const elementHandle = await page.$('text=Get started');17  const internalAPI = page._delegate;18  await page.waitForSelector('text=Playwright API Docs');19  await page.waitForSelector('text=Playwright API Docs');20  await page.waitForSelector('text=Playwright API Docs');21  await internalAPI.insertLazyTreeChildAt(elementHandle, { role: 'link',

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch({ headless: false });4  const page = await browser.newPage();5  await page.insertLazyTreeChildAt('div', 'div', 0);6  await page.screenshot({ path: 'screenshot.png' });7  await browser.close();8})();

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch({ headless: false });4  const page = await browser.newPage();5  await page.waitForSelector('input[name="q"]');6  const input = page.locator('input[name="q"]');7  await page.evaluate(async (input) => {8    const { insertLazyTreeChildAt } = require('@playwright/test/lib/server/frames');9    const element = await input.evaluateHandle((input) => input);10    await insertLazyTreeChildAt(element, 0, 'div', {11    });12  }, input);13  await page.screenshot({ path: 'test.png' });14  await browser.close();15})();

Using AI Code Generation

1const { insertLazyTreeChildAt } = require('playwright/lib/server/dom.js');2const { chromium } = require('playwright');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  const element = await page.$('header');8  const child = await page.evaluateHandle(() => document.createElement('div'));9  await insertLazyTreeChildAt(element, child, 0);10  await browser.close();11})();12Error: Protocol error (DOM.insertLazyTreeChildAt): insertLazyTreeChildAt is not supported

Using AI Code Generation

1const { insertLazyTreeChildAt } = 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 { insertLazyTreeChildAt } = require('playwright/lib/server/dom.js');6const { ElementHandle } = require('playwright/lib/server/dom.js');7const { JSHandle } = require('playwright/lib/server/dom.js');8const { Page } = require('playwright/lib/server/page.js');9const { insertLazyTreeChildAt } = require('playwright/lib/server/dom.js');10const { ElementHandle } = require('playwright/lib/server/dom.js');11const { JSHandle } = require('playwright/lib/server/dom.js');12const { Page } = require('playwright/lib/server/page.js');13const { insertLazyTreeChildAt } = require('playwright/lib/server/dom.js');14const { ElementHandle } = require('playwright/lib/server/dom.js');15const { JSHandle } = require('playwright/lib/server/dom.js');16const { Page } = require('playwright/lib/server/page.js');17const { insertLazyTreeChildAt } = require('playwright/lib/server/dom.js');18const { ElementHandle } = require('playwright/lib/server/dom.js');19const { JSHandle } = require('playwright/lib/server/dom.js');20const { Page } = require('playwright/lib/server/page.js');21const { insertLazyTreeChildAt } = require('playwright/lib/server/dom.js');22const { ElementHandle } = require('playwright/lib/server/dom.js');23const { JSHandle } = require('playwright/lib/server/dom.js');24const { Page } = require('playwright/lib/server/page.js');25const { insertLazyTreeChildAt } = require('playwright/lib/server/dom.js');26const { ElementHandle } = require('playwright/lib

Using AI Code Generation

1const { insertLazyTreeChildAt } = require('@playwright/test/lib/lazyTree');2insertLazyTreeChildAt(parent, child, index);3const { test } = require('@playwright/test');4test.describe('My test suite', () => {5  test('My test', async ({ page }) => {6  });7});8import { test } from '@playwright/test';9test.describe('My test suite', () => {10  test('My test', async ({ page }) => {11  });12});13import * as test from '@playwright/test';14test.describe('My test suite', () => {15  test('My test', async ({ page }) => {16  });17});18import { test } from '@playwright/test';19test.describe('My test suite', () => {20  test('My test', async ({ page }) => {21  });22});

Using AI Code Generation

1import { insertLazyTreeChildAt } from 'playwright/lib/client/lazyTreeUtils';2const child = insertLazyTreeChildAt(parent, index, name, value);3const child = insertLazyTreeChildAt(parent, index, name, value, isExpandable);4const child = insertLazyTreeChildAt(parent, index, name, value, isExpandable, isCircular);5const child = insertLazyTreeChildAt(parent, index, name, value, isExpandable, isCircular, isHidden);6const child = insertLazyTreeChildAt(parent, index, name, value, isExpandable, isCircular, isHidden, isPrimitive);7const child = insertLazyTreeChildAt(parent, index, name, value, isExpandable, isCircular, isHidden, isPrimitive, isAsync);8const child = insertLazyTreeChildAt(parent, index, name, value, isExpandable, isCircular, isHidden, isPrimitive, isAsync, isPromise);9const child = insertLazyTreeChildAt(parent, index, name, value, isExpandable, isCircular, isHidden, isPrimitive, isAsync, isPromise, isElement);10const child = insertLazyTreeChildAt(parent, index, name, value, isExpandable, isCircular, isHidden, isPrimitive, isAsync, isPromise, isElement, isWindow);11const child = insertLazyTreeChildAt(parent, index, name, value, isExpandable, isCircular, isHidden, isPrimitive, isAsync, isPromise, isElement, isWindow, isNode);12const child = insertLazyTreeChildAt(parent, index, name, value, isExpandable, isCircular, isHidden, isPrimitive, isAsync, isPromise, isElement, isWindow, is

StackOverFlow community discussions

Questions

Discussion

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

firefox browser does not start in playwright

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

firefox browser does not start in playwright

Running Playwright in Azure Function

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

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

Blogs

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There is just one area where each member of the software testing community has a distinct point of view! Metrics! This contentious issue sparks intense disputes, and most conversations finish with no definitive conclusion. It covers a wide range of topics: How can testing efforts be measured? What is the most effective technique to assess effectiveness? Which of the many components should be quantified? How can we measure the quality of our testing performance, among other things?

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Coaching is a term that is now being mentioned a lot more in the leadership space. Having grown successful teams I thought that I was well acquainted with this subject.

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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:

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