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How to use trackValueOnNode method in Playwright Internal

Best JavaScript code snippet using playwright-internal

inputValueTracking.js

Source:inputValueTracking.js

...49      : node.value;50  }51  return value;52}53function trackValueOnNode(node : any, inst : any) : ?ValueTracker {54  var valueField = isCheckable(node) ? 'checked' : 'value';55  var descriptor = Object.getOwnPropertyDescriptor(56    node.constructor.prototype,57    valueField58  );59  var currentValue = '' + node[valueField];60  // if someone has already defined a value or Safari, then bail61  // and don't track value will cause over reporting of changes,62  // but it's better then a hard failure63  // (needed for certain tests that spyOn input values and Safari)64  if (65    node.hasOwnProperty(valueField) ||66    typeof descriptor.get !== 'function' ||67    typeof descriptor.set !== 'function'68  ) {69    return;70  }71  Object.defineProperty(node, valueField, {72    enumerable: descriptor.enumerable,73    configurable: true,74    get: function() {75      return descriptor.get.call(this);76    },77    set: function(value) {78      currentValue = '' + value;79      descriptor.set.call(this, value);80    },81  });82  var tracker = {83    getValue() {84      return currentValue;85    },86    setValue(value) {87      currentValue = '' + value;88    },89    stopTracking() {90      detachTracker(inst);91      delete node[valueField];92    },93  };94  return tracker;95}96var inputValueTracking = {97  // exposed for testing98  _getTrackerFromNode(node : ElementWithWrapperState) {99    return getTracker(100      ReactDOMComponentTree.getInstanceFromNode(node)101    );102  },103  trackNode: function(node : ElementWithWrapperState) {104    if (node._wrapperState.valueTracker) {105      return;106    }107    node._wrapperState.valueTracker = trackValueOnNode(node, node);108  },109  track: function(inst : InstanceWithWrapperState) {110    if (getTracker(inst)) {111      return;112    }113    var node = ReactDOMComponentTree.getNodeFromInstance(inst);114    attachTracker(inst, trackValueOnNode(node, inst));115  },116  updateValueIfChanged(inst : InstanceWithWrapperState | Fiber) {117    if (!inst) {118      return false;119    }120    var tracker = getTracker(inst);121    if (!tracker) {122      if (typeof (inst : any).tag === 'number') {123        inputValueTracking.trackNode((inst : any).stateNode);124      } else {125        inputValueTracking.track((inst : any));126      }127      return true;128    }...

secureElementProxyTestHelper.js

Source:secureElementProxyTestHelper.js

1({2    // Portion of React's trackValueOnNode.3    // See inputValueTracking.js4    // https://github.com/facebook/react/blob/master/packages/react-dom/src/client/inputValueTracking.js5    trackValueOnNode: function (node, valueField) {6        var descriptor = Object.getOwnPropertyDescriptor(7            node.constructor.prototype,8            valueField9        );10        var currentValue = '' + node[valueField];11        Object.defineProperty(node, valueField, {12            enumerable: descriptor.enumerable,13            configurable: true,14            get: function() {15                return descriptor.get.call(this);16            },17            set: function(value) {18                currentValue = '' + value;19                descriptor.set.call(this, value);20            },21        });22        function getValue() {23          return currentValue;24        };25        return getValue;26    }...

Using AI Code Generation

1const { chromium } = require('playwright');2const { trackValueOnNode } = require('playwright/lib/server/dom.js');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  await page.fill('input[aria-label="Search"]', 'Playwright');8  const handle = await page.$('input[aria-label="Search"]');9  const value = await trackValueOnNode(handle);10  console.log(value);11  await browser.close();12})();13trackValueOnNode(handle);14const { chromium } = require('playwright');15const { trackValueOnNode } = require('playwright/lib/server/dom.js');16(async () => {17  const browser = await chromium.launch();18  const context = await browser.newContext();19  const page = await context.newPage();20  await page.click('input[aria-label="Search"]');21  await page.keyboard.press('Delete');22  const handle = await page.$('input[aria-label="Search"]');23  const value = await trackValueOnNode(handle);24  console.log(value);25  await browser.close();26})();

Using AI Code Generation

1const { trackValueOnNode } = require('playwright/lib/internal/inspectorInstrumentation');2const { chromium } = require('playwright');3(async () => {4  const browser = await chromium.launch();5  const page = await browser.newPage();6  await trackValueOnNode(page, handle, 'click', () => console.log('Clicked'));7  await handle.click();8  await browser.close();9})();

Using AI Code Generation

1const { trackValueOnNode } = require('@playwright/test/lib/internal/inspectorInstrumentation');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  await page.waitForSelector('text=Get started');8  await page.click('text=Get started');9  await page.waitForSelector('text=Create a test project');10  const element = await page.waitForSelector('text=Create a test project');11  trackValueOnNode(element, 'textContent', 'Create a test project');12  await page.click('text=Create a test project');13  await page.waitForSelector('text=Run your first test');14  await page.click('text=Run your firs

Using AI Code Generation

1const { trackValueOnNode } = require('playwright-core/lib/server/supplements/recorder/recorderSupplement.js');2const { chromium } = require('playwright-core');3(async () => {4  const browser = await chromium.launch();5  const page = await browser.newPage();6  await page.waitForSelector('input[name="q"]');7  await trackValueOnNode(page, 'input[name="q"]', 'value', 'input');8  await page.type('input[name="q"]', 'Hello World!');9  await page.screenshot({ path: 'google.png' });10  await browser.close();11})();12module.exports = {13  use: {14  },15};16{17  "scripts": {18  },19  "dependencies": {20  }21}

Using AI Code Generation

1const {trackValueOnNode} = require('playwright/lib/server/supplements/recorder/recorderSupplement.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.$('input');8  const value = await trackValueOnNode(element);9  console.log(value);10  await browser.close();11})();12const {helper} = require('../../helper');13const {ElementHandle} = require('../../dom');14const {createInstrumentationListener} = require('./instrumentationSupplement.js');15const {createValueTracker} = require('./valueTracker.js');16module.exports = {trackValueOnNode};17 * @param {!ElementHandle} elementHandle18 * @return {!Promise<string>}19async function trackValueOnNode(elementHandle) {20  const page = elementHandle._context._page;21  const instrumentationListener = await createInstrumentationListener(page);22  const valueTracker = await createValueTracker(instrumentationListener, elementHandle);23  await valueTracker.start();24  const result = await page.evaluate(element => element.value, elementHandle);25  await valueTracker.stop();26  return result;27}28const {helper} = require('../helper');29const {InstrumentationListener} = require('../instrumentation');30module.exports = {createInstrumentationListener};31 * @param {!Page} page32 * @return {!Promise<!InstrumentationListener>}33async function createInstrumentationListener(page) {34  const listener = new InstrumentationListener(page);35  await listener.install();36  return listener;37}38const {helper} = require('../helper');39const {InstrumentationListener} = require('../instrumentation');40const {createInstrumentationListener} = require('./instrumentationSupplement.js');41const {ElementHandle} = require('../

Using AI Code Generation

1const { trackValueOnNode } = require('playwright/lib/internal/inspectorInstrumentation');2const { trackValueOnNode } = require('playwright/lib/internal/inspectorInstrumentation');3const { trackValueOnNode } = require('playwright/lib/internal/inspectorInstrumentation');4const { trackValueOnNode } = require('playwright/lib/internal/inspectorInstrumentation');5const { trackValueOnNode } = require('playwright/lib/internal/inspectorInstrumentation');6const { trackValueOnNode } = require('playwright/lib/internal/inspectorInstrumentation');7const { trackValueOnNode } = require('playwright/lib/internal/inspectorInstrumentation');8const { trackValueOnNode } = require('playwright/lib/internal/inspectorInstrumentation');9const { trackValueOnNode } = require('playwright/lib/internal/inspectorInstrumentation');10const { trackValueOnNode } = require('playwright/lib/internal/inspectorInstrumentation');11const { trackValueOnNode } = require('playwright/lib/internal/inspectorInstrumentation');12const { trackValueOnNode } = require('playwright/lib/internal/inspectorInstrumentation');13const { trackValueOnNode } = require('playwright/lib/internal/inspectorInstrumentation');14const { trackValueOnNode } = require('playwright/lib/internal/inspectorInstrumentation');15const { trackValueOnNode }

Using AI Code Generation

1const { trackValueOnNode } = require('playwright/lib/server/supplements/recorder/recorderSupplement.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 input = await page.$('input');8    await trackValueOnNode(page, input);9    await input.type('Hello World');10    await page.screenshot({ path: 'example.png' });11    await browser.close();12})();

Using AI Code Generation

1const { chromium } = require('playwright');2const { trackValueOnNode } = require('playwright/lib/server/trace/recorder/domSnapshot');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  const input = await page.$('input[name="q"]');8  const snapshot = await page._delegate._pageProxy._browserContext._browser._pageProxy._frameManager._mainFrame._page._domSnapshotter.takeSnapshot('full', true);9  const value = trackValueOnNode(input, snapshot);10  console.log(value);11  await browser.close();12})();13const { chromium } = require('playwright');14const { trackValueOnNode } = require('playwright/lib/server/trace/recorder/domSnapshot');15(async () => {16  const browser = await chromium.launch();17  const context = await browser.newContext();18  const page = await context.newPage();19  const input = await page.$('input[name="q"]');20  const snapshot = await page._delegate._pageProxy._browserContext._browser._pageProxy._frameManager._mainFrame._page._domSnapshotter.takeSnapshot('full', true);21  const value = trackValueOnNode(input, snapshot);22  console.log(value);23  await browser.close();24})();

Using AI Code Generation

1const { trackValueOnNode } = require('playwright-core/lib/server/supplements/recorder/recorderSupplement.js');2const { trackValueOnNode } = require('playwright-core/lib/server/supplements/recorder/recorderSupplement.js');3const { trackValueOnNode } = require('playwright-core/lib/server/supplements/recorder/recorderSupplement.js');4const { trackValueOnNode } = require('playwright-core/lib/server/supplements/recorder/recorderSupplement.js');5const { trackValueOnNode } = require('playwright-core/lib/server/supplements/recorder/recorderSupplement.js');6const { trackValueOnNode } = require('playwright-core/lib/server/supplements/recorder/recorderSupplement.js');7const { trackValueOnNode } = require('playwright-core/lib/server/supplements/recorder/recorderSupplement.js');8const { trackValueOnNode } = require('playwright-core/lib/server/supplements/recorder/recorderSupplement.js');9const { chromium } = require('playwright-core');10(async () => {11const { trackValueOnNode } = require('playwright-core/lib/server/supplements/recorder/recorderSupplement.js');12const { trackValueOnNode } = require('playwright-core/lib/server/supplements/recorder/recorderSupplement.js');13const { trackValueOnNode } = require('playwright-core/lib/server/supplements/recorder/recorderSupplement.js');14const { trackValueOnNode } = require('playwright-core/lib/server/supplements/recorder/recorderSupplement.js');

Using AI Code Generation

1const {chromium} = require('playwright');2const {trackValueOnNode} = require('playwright/lib/internal/inspector').helper;3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  await page.waitForSelector('input[type=text]');8  await trackValueOnNode(page, 'input[type=text]', (value) => {9      console.log(value);10  });11  await browser.close();12})();

StackOverFlow community discussions

Questions

Discussion

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

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

firefox browser does not start in playwright

Running Playwright in Azure Function

firefox browser does not start in playwright

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

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

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

Blogs

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