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How to use evalOnSelectorAll method in Playwright Internal

Best JavaScript code snippet using playwright-internal

elementHandlerDispatcher.js

...220        )221      )222    }223  }224  async evalOnSelectorAll(params, metadata) {225    return {226      value: (0, _jsHandleDispatcher.serializeResult)(227        await this._elementHandle.evalOnSelectorAllAndWaitForSignals(228          params.selector,229          params.expression,230          params.isFunction,231          (0, _jsHandleDispatcher.parseArgument)(params.arg)232        )233      )234    }235  }236  async waitForElementState(params, metadata) {237    await this._elementHandle.waitForElementState(238      metadata,...

generateJavaSnippets.js

Source: generateJavaSnippets.js

...36    // Rename some methods37    line = line.replace(/\.goto\(/g, '.navigate(');38    line = line.replace(/\.continue\(/g, '.resume(');39    line = line.replace(/\.\$eval\(/g, '.evalOnSelector(');40    line = line.replace(/\.\$\$eval\(/g, '.evalOnSelectorAll(');41    line = line.replace(/\.\$\(/g, '.querySelector(');42    line = line.replace(/\.\$\$\(/g, '.querySelectorAll(');43    line = line.replace(/console.log/g, 'System.out.println');44    line = line.replace(/page.evaluate\((\(\) => [^\)]+)\)/g, 'page.evaluate("$1")');45    // Convert properties to methods46    line = line.replace(/\.keyboard\./g, '.keyboard().');47    line = line.replace(/\.mouse\./g, '.mouse().');48    line = line.replace(/\.coverage\./g, '.coverage().');49    line = line.replace(/\.accessibility\./g, '.accessibility().');50    line = line.replace(/\.chromium\./g, '.chromium().');51    line = line.replace(/\.webkit\./g, '.webkit().');52    line = line.replace(/\.firefox\./g, '.firefox().');53    line = line.replace(/\.length/g, '.size()');54  ...

channels.js

Source: channels.js

1"use strict";2Object.defineProperty(exports, "__esModule", {3  value: true4});5exports.commandsWithTracingSnapshots = void 0;6/**7 * Copyright (c) Microsoft Corporation.8 *9 * Licensed under the Apache License, Version 2.0 (the "License");10 * you may not use this file except in compliance with the License.11 * You may obtain a copy of the License at12 *13 * http://www.apache.org/licenses/LICENSE-2.014 *15 * Unless required by applicable law or agreed to in writing, software16 * distributed under the License is distributed on an "AS IS" BASIS,17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.18 * See the License for the specific language governing permissions and19 * limitations under the License.20 */21// This file is generated by generate_channels.js, do not edit manually.22// ----------- Playwright -----------23// ----------- Selectors -----------24// ----------- BrowserType -----------25// ----------- Browser -----------26// ----------- EventTarget -----------27// ----------- BrowserContext -----------28// ----------- Page -----------29// ----------- Frame -----------30// ----------- Worker -----------31// ----------- JSHandle -----------32// ----------- ElementHandle -----------33// ----------- Request -----------34// ----------- Route -----------35// ----------- Response -----------36// ----------- WebSocket -----------37// ----------- ConsoleMessage -----------38// ----------- BindingCall -----------39// ----------- Dialog -----------40// ----------- Artifact -----------41// ----------- Stream -----------42// ----------- CDPSession -----------43// ----------- Electron -----------44// ----------- ElectronApplication -----------45// ----------- Android -----------46// ----------- AndroidSocket -----------47// ----------- AndroidDevice -----------48// ----------- SocksSocket -----------49const commandsWithTracingSnapshots = new Set(['EventTarget.waitForEventInfo', 'BrowserContext.waitForEventInfo', 'Page.waitForEventInfo', 'WebSocket.waitForEventInfo', 'ElectronApplication.waitForEventInfo', 'AndroidDevice.waitForEventInfo', 'Page.goBack', 'Page.goForward', 'Page.reload', 'Page.setViewportSize', 'Page.keyboardDown', 'Page.keyboardUp', 'Page.keyboardInsertText', 'Page.keyboardType', 'Page.keyboardPress', 'Page.mouseMove', 'Page.mouseDown', 'Page.mouseUp', 'Page.mouseClick', 'Page.touchscreenTap', 'Frame.evalOnSelector', 'Frame.evalOnSelectorAll', 'Frame.addScriptTag', 'Frame.addStyleTag', 'Frame.check', 'Frame.click', 'Frame.dblclick', 'Frame.dispatchEvent', 'Frame.evaluateExpression', 'Frame.evaluateExpressionHandle', 'Frame.fill', 'Frame.focus', 'Frame.getAttribute', 'Frame.goto', 'Frame.hover', 'Frame.innerHTML', 'Frame.innerText', 'Frame.inputValue', 'Frame.isChecked', 'Frame.isDisabled', 'Frame.isEnabled', 'Frame.isHidden', 'Frame.isEditable', 'Frame.press', 'Frame.selectOption', 'Frame.setContent', 'Frame.setInputFiles', 'Frame.tap', 'Frame.textContent', 'Frame.type', 'Frame.uncheck', 'Frame.waitForFunction', 'Frame.waitForSelector', 'JSHandle.evaluateExpression', 'ElementHandle.evaluateExpression', 'JSHandle.evaluateExpressionHandle', 'ElementHandle.evaluateExpressionHandle', 'ElementHandle.evalOnSelector', 'ElementHandle.evalOnSelectorAll', 'ElementHandle.check', 'ElementHandle.click', 'ElementHandle.dblclick', 'ElementHandle.dispatchEvent', 'ElementHandle.fill', 'ElementHandle.hover', 'ElementHandle.press', 'ElementHandle.scrollIntoViewIfNeeded', 'ElementHandle.selectOption', 'ElementHandle.selectText', 'ElementHandle.setInputFiles', 'ElementHandle.tap', 'ElementHandle.type', 'ElementHandle.uncheck', 'ElementHandle.waitForElementState', 'ElementHandle.waitForSelector']);...

helpers.js

Source: helpers.js

1const os = require("os")2const path = require("path")3const fs = require("fs")4const child_process = require("child_process")5const getCliVersion = () => {6  const runGoContent = fs.readFileSync(path.join(__dirname, "..", "run.go")).toString()7  const findings = /playwrightCliVersion = "(.*)"/.exec(runGoContent)8  return findings[1]9}10const getCacheDirectory = () => {11  switch (os.platform()) {12    case "linux":13      return path.join(os.homedir(), '.cache');14    case "darwin":15      return path.join(os.homedir(), 'Library', 'Caches');16    case 'win32':17      return path.join(os.homedir(), 'AppData', 'Local');18    default:19      throw new Error(`Not implemented for: ${os.platform()}`)20  }21}22const getCliLocation = () => {23  const cacheDirectory = getCacheDirectory()24  const cliVersion = getCliVersion()25  if (os.platform() !== "win32")26    return path.join(cacheDirectory, "ms-playwright-go", cliVersion, "playwright.sh")27  return path.join(cacheDirectory, "ms-playwright-go", cliVersion, "playwright.cmd")28}29const getAPIDocs = () => {30  return JSON.parse(child_process.execSync(`"${getCliLocation()}" print-api-json`, {31    maxBuffer: 1024 * 1024 * 10,32    shell: true33  }).toString())34}35const transformMethodNamesToGo = (funcName) => {36  const standardised = funcName37    .replace("$$eval", "evalOnSelectorAll")38    .replace("$eval", "evalOnSelector")39    .replace("$$", "querySelectorAll")40    .replace("$", "querySelector")41    .replace("pdf", "PDF")42    .replace("url", "URL")43    .replace("json", "JSON")44  return standardised[0].toUpperCase() + standardised.slice(1)45}46module.exports = {47  getAPIDocs,48  transformMethodNamesToGo,...

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const page = await browser.newPage();5  const elements = await page.$$eval('a', (links) => {6    return links.map((a) => a.href);7  });8  console.log(elements);9  await browser.close();10})();

Using AI Code Generation

1const { chromium } = require('playwright');2const fs = require('fs');3const path = require('path');4(async () => {5  const browser = await chromium.launch({ headless: false });6  const page = await browser.newPage();7  const results = await page.$$eval('div.g', (divs) => {8    return divs.map((div) => {9      return {10        title: div.querySelector('h3').innerText,11        link: div.querySelector('a').href,12      };13    });14  });15  console.log(results);16  await browser.close();17})();

Using AI Code Generation

1const { evalOnSelectorAll } = require('playwright/lib/protocol/dom.js');2const { evalOnSelector } = require('playwright/lib/protocol/dom.js');3const { evalOnCallFrame } = require('playwright/lib/protocol/runtime.js');4const { evalOnCallFrame } = require('playwright/lib/protocol/runtime.js');5async function run() {6    const browser = await chromium.launch();7    const context = await browser.newContext();8    const page = await context.newPage();9    const result = await evalOnSelectorAll(page, 'a', 'nodes => nodes.map(n => n.href)');10    console.log(result);11    const result2 = await evalOnSelector(page, 'a', 'node => node.href');12    console.log(result2);13    const result3 = await evalOnCallFrame(page, 'window', 'window.location.href');14    console.log(result3);15    const result4 = await evalOnCallFrame(page, 'window', 'window.location.href');16    console.log(result4);17    await browser.close();18}19run();20const { evalOnSelectorAll } = require('playwright/lib/protocol/dom.js');21const { evalOnSelector } = require('playwright/lib/protocol/dom.js');22const { evalOnCallFrame } = require('playwright/lib/protocol/runtime.js');23const { evalOnCallFrame } = require('playwright/lib/protocol/runtime.js');24async function run() {25    const browser = await chromium.launch();26    const context = await browser.newContext();27    const page = await context.newPage();

Using AI Code Generation

1const { evalOnSelectorAll } = require('playwright/lib/server/dom.js');2(async () => {3  const browser = await chromium.launch();4  const page = await browser.newPage();5  await page.waitForSelector('form');6  const result = await evalOnSelectorAll(page, 'form', (form) => {7    return form.length;8  });9  console.log(result);10  await browser.close();11})();

Using AI Code Generation

1const { firefox } = require('playwright');2(async () => {3  const browser = await firefox.launch();4  const page = await browser.newPage();5  const result = await page.evaluate(async () => {6    const elements = await window['playwright'].evalOnSelectorAll('body', 'document.querySelectorAll("a")');7    return elements.map(el => el.href);8  });9  console.log(result);10  await browser.close();11})();

Using AI Code Generation

1const { evalOnSelectorAll } = require('playwright/lib/server/dom.js');2const { context } = require('playwright/lib/server/browserContext.js');3const { Page } = require('playwright/lib/server/page.js');4const { ElementHandle } = require('playwright/lib/server/frames.js');5const { JSHandle } = require('playwright/lib/server/jsHandle.js');6const { serializeResult } = require('playwright/lib/server/serializers.js');7async function evalOnSelectorAllTest() {8  const page = await browser.newPage();9  await page.setContent(`<div id="foo">foo</div><div id="bar">bar</div>`);10  const result = await evalOnSelectorAll(11    (element, _selector) => {12      return element.id;13    },14    { arg: 'foo' }15  );16  const json = await serializeResult(result);17  console.log(json);18  await page.close();19}20evalOnSelectorAllTest();21  {22    objectId: '{"injectedScriptId":2,"id":1}',23  },24  {25    objectId: '{"injectedScriptId":2,"id":2}',26  }27const { evalOnSelectorAll } = require('playwright/lib/server/dom.js');28const { context } = require('playwright/lib/server/browserContext.js');29const { Page } = require('playwright/lib/server/page.js');30const { ElementHandle } = require('playwright/lib/server/frames.js');31const { JSHandle } = require('playwright/lib/server/jsHandle.js');32const { serializeResult } = require('playwright/lib/server/serializers.js');33async function evalOnSelectorAllTest() {34  const page = await browser.newPage();35  await page.setContent(`<div id="foo">foo</div><div id="bar">bar</div>`);36  const result = await evalOnSelectorAll(37    (element, _selector) =>

Using AI Code Generation

1const { evalOnSelectorAll } = require("playwright/lib/internal/evaluators/Evaluator");2const { Page } = require("playwright/lib/frames");3const page = await browser.newPage();4const result = await evalOnSelectorAll(5  (nodes) => nodes.map((n) => n.href),6  {}7);8console.log(result);9await browser.close();

Using AI Code Generation

1const { chromium } = require('playwright-chromium');2(async () => {3  const browser = await chromium.launch({ headless: false, slowMo: 500 });4  const context = await browser.newContext();5  const page = await context.newPage();6  const results = await page.$$eval('a', (as) => as.map(a => a.href));7  console.log(results);8  await browser.close();9})();10const { chromium } = require('playwright-chromium');11(async () => {12  const browser = await chromium.launch({ headless: false, slowMo: 500 });13  const context = await browser.newContext();14  const page = await context.newPage();15  const result = await page.$eval('a', (a) => a.href);16  console.log(result);17  await browser.close();18})();19const { chromium } = require('playwright-chromium');20(async () => {21  const browser = await chromium.launch({ headless: false, slowMo: 500 });22  const context = await browser.newContext();23  const page = await context.newPage();24  const results = await page.$$eval('a', (as) => as.map(a => a.href));25  console.log(results);26  await browser.close();27})();28const { chromium } = require('playwright-chromium');29(async () => {30  const browser = await chromium.launch({ headless: false, slowMo: 500 });31  const context = await browser.newContext();32  const page = await context.newPage();33  const result = await page.$eval('a', (a) => a.href);

StackOverFlow community discussions

Questions

Discussion

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

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

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

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

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

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

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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