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How to use getToStringValue method in Playwright Internal

Best JavaScript code snippet using playwright-internal

ReactDOMInput.js

...10  const defaultValue = props.defaultValue == null ? '' : props.defaultValue;11  node._wrapperState = {12    initialChecked:13      props.checked != null ? props.checked : props.defaultChecked,14    initialValue: getToStringValue(15      props.value != null ? props.value : defaultValue16    ),17    controlled: isControlled(props),18  };19};20const getHostProps = (element, props) => {21  const node = element;22  const checked = props.checked;23  const hostProps = Object.assign({}, props, {24    defaultChecked: undefined,25    defaultValue: undefined,26    value: undefined,27    checked: checked != null ? checked : node._wrapperState.initialChecked,28  });29  return hostProps;30};31const postMountWrapper = (element, props, isHydrating) => {32  const node = element;33  if (props.hasOwnProperty('value') || props.hasOwnProperty('defaultValue')) {34    const type = props.type;35    const isButton = type === 'submit' || type === 'reset';36    if (isButton && (props.value === undefined || props.value === null)) return;37    const initialValue = toString(node._wrapperState.initialValue);38    if (!isHydrating && initialValue !== node.value) {39      node.value = initialValue;40    }41    node.defaultValue = initialValue;42  }43  const name = node.name;44  if (name !== '') {45    node.name = '';46  }47  node.defaultChecked = !node.defaultChecked;48  node.defaultChecked = !!node._wrapperState.initialChecked;49  if (name !== '') {50    node.name = name;51  }52};53const updateChecked = (element, props) => {54  const node = element;55  const checked = props.checked;56  if (checked != null) {57    setValueForProperty(node, 'checked', checked, false);58  }59};60const setDefaultValue = (node, type, value) => {61  if (type !== 'number' || getActiveElement(node.ownerDocument) !== node) {62    if (value == null) {63      node.defaultValue = toString(node._wrapperState.initialValue);64    } else if (node.defaultValue !== toString(value)) {65      node.defaultValue = toString(value);66    }67  }68};69const updateWrapper = (element, props) => {70  const node = element;71  updateChecked(element, props);72  const value = getToStringValue(props.value);73  const type = props.type;74  if (value != null) {75    if (type === 'number') {76      if ((value === 0 && node.value === '') || node.value != value) {77        node.value = toString(value);78      }79    } else if (node.value !== toString(value)) {80      node.value = toString(value);81    }82  } else if (type === 'submit' || type === 'reset') {83    node.removeAttribute('value');84    return;85  }86  if (props.hasOwnProperty('value')) {87    setDefaultValue(node, props.type, value);88  } else if (props.hasOwnProperty('defaultValue')) {89    setDefaultValue(node, props.type, getToStringValue(props.defaultValue));90  }91  if (props.checked == null && props.defaultChecked != null) {92    node.defaultChecked = !!props.defaultChecked;93  }94};95export {96  initWrapperState,97  getHostProps,98  postMountWrapper,99  updateChecked,100  setDefaultValue,101  updateWrapper,...

ReactDOMTextarea.js

Source: ReactDOMTextarea.js

...38    }39    initialValue = defaultValue;40  }41  node._wrapperState = {42    initialValue: getToStringValue(initialValue),43  };44};45const postMountWrapper = (element, props) => {46  const node = element;47  const textContent = node.textContent;48  if (textContent === node._wrapperState.initialValue) {49    if (textContent !== '' && textContent !== null) {50      node.value = textContent;51    }52  }53};54const updateWrapper = (element, props) => {55  const node = element;56  const value = getToStringValue(props.value);57  const defaultValue = getToStringValue(props.defaultValue);58  if (value != null) {59    const newValue = toString(value);60    if (newValue !== node.value) {61      node.value = newValue;62    }63    if (props.defaultValue == null && node.defaultValue !== newValue) {64      node.defaultValue = newValue;65    }66  }67  if (defaultValue != null) {68    node.defaultValue = toString(defaultValue);69  }70};71export { initWrapperState, getHostProps, postMountWrapper, updateWrapper };

index.js

Source: index.js

...65     return ["Hi ! I'm ", _firstName, " ", _lastName, " and I'm ", _age, " year old."].join("");66    };67    68    this.toString = function () {69      return getToStringValue();70    };71  };72  73  var yann = new Person("Yannick", "Comte", 0);74  yann.setAge(28);75  yann._age = 45; // Add a property "_age" to the object, not changing the private "_age" variable !76  //yann.getToStringValue(); // Doesn't work because it's private !7778  console.log(yann);7980 console.log(yann.toString()); // It's good because it's public ;)81
...

ToStringValue.js

Source: ToStringValue.js

...17// Flow does not allow string concatenation of most non-string types. To work18// around this limitation, we use an opaque type that can only be obtained by19// passing the value through getToStringValue first.20export function toString(value: ToStringValue): string {21  // The coercion safety check is performed in getToStringValue().22  // eslint-disable-next-line react-internal/safe-string-coercion23  return '' + (value: any);24}25export function getToStringValue(value: mixed): ToStringValue {26  switch (typeof value) {27    case 'boolean':28    case 'number':29    case 'string':30    case 'undefined':31      return value;32    case 'object':33      if (__DEV__) {34        checkFormFieldValueStringCoercion(value);35      }36      return value;37    default:38      // function, symbol are assigned as empty strings39      return '';...

Using AI Code Generation

1const { getToStringValue } = require('playwright/lib/server/frames');2const { getToStringValue } = require('playwright/lib/server/frames');3const { chromium } = require('playwright');4(async () => {5  const browser = await chromium.launch();6  const context = await browser.newContext();7  const page = await context.newPage();8  const value = await page.evaluate(() => {9    return {10    };11  });12  const valueString = getToStringValue(value);13  console.log(valueString);14  await browser.close();15})();16{ foo: 1, bar: 2, baz: 3 }

Using AI Code Generation

1const { getToStringValue } = require('playwright-core/lib/server/common/utils');2console.log(getToStringValue({ a: 1, b: 2 }));3const { getToStringValue } = require('playwright-core/lib/server/common/utils');4console.log(getToStringValue({ a: 1, b: 2 }, 1));5const { getToStringValue } = require('playwright-core/lib/server/common/utils');6console.log(getToStringValue({ a: 1, b: 2 }, 0));7const { getToStringValue } = require('playwright-core/lib/server/common/utils');8console.log(getToStringValue({ a: 1, b: 2 }, 5));9const { getToStringValue } = require('playwright-core/lib/server/common/utils');10console.log(getToStringValue({ a: 1, b: 2 }, 2));11const { getToStringValue } = require('playwright-core/lib/server/common/utils');12console.log(getToStringValue({ a: 1, b: 2 }, 3));13const { getToStringValue } = require('playwright-core/lib/server/common/utils');14console.log(getToStringValue({ a: 1, b: 2 }, 4));15const { getToStringValue } = require('playwright-core/lib/server/common/utils');16console.log(getToStringValue({ a: 1, b: 2 }, 6));

Using AI Code Generation

1const { getToStringValue } = require('playwright/lib/client/serializers');2const { Page } = require('playwright');3const page = new Page();4const elementHandle = await page.$('p');5const text = await elementHandle.evaluate(element => element.textContent);6console.log(getToStringValue(text));7const { getToStringValue } = require('puppeteer/lib/cjs/puppeteer/common/JSHandle');8const puppeteer = require('puppeteer');9const browser = await puppeteer.launch();10const page = await browser.newPage();11const elementHandle = await page.$('p');12const text = await elementHandle.evaluate(element => element.textContent);13console.log(getToStringValue(text));14const { getToStringValue } = require('cypress/lib/cypress/stack_utils');15const cypress = require('cypress');16const elementHandle = await cypress.$('p');17const text = await elementHandle.text();18console.log(getToStringValue(text));19const { getToStringValue } = require('webdriverio/build/utils');20const { remote } = require('webdriverio');21const browser = await remote({ /* ... */ });22const elementHandle = await browser.$('p');23const text = await elementHandle.getText();24console.log(getToStringValue(text));25const { getToStringValue } = require('testcafe/lib/utils/stack-trace');26const testcafe = require('testcafe');27const testController = await testcafe.createTestCafe(/* ... */);28const elementHandle = await testController.select('p');29const text = await elementHandle.textContent;30console.log(getToStringValue(text));

Using AI Code Generation

1const { getToStringValue } = require('playwright/lib/utils/utils.js');2const { Page } = require('playwright/lib/server/page.js');3const page = new Page();4const element = page.locator('css=div');5const value = getToStringValue(element);6console.log(value);7const { Page } = require('playwright/lib/server/page.js');8const page = new Page();9const element = page.locator('css=div');10const value = element.toString();11console.log(value);

Using AI Code Generation

1const { getToStringValue } = require('playwright/lib/server/frames');2const { getToStringValue } = require('puppeteer/lib/helper');3const { getToStringValue } = require('webdriverio/build/utils');4const { getToStringValue } = require('cypress/lib/server/util');5const { getToStringValue } = require('testcafe/lib/utils');6const { getToStringValue } = require('nightwatch/lib/api/util/utils');7const { getToStringValue } = require('protractor/built/util');8const { getToStringValue } = require('selenium-webdriver/lib/utils');9const { getToStringValue } = require('detox/src/utils/getToStringValue');

Using AI Code Generation

1const { getToStringValue } = require('playwright/lib/server/frames');2const page = await browser.newPage();3const value = await getToStringValue(page, {objectHandle: someHandle});4console.log(value);5const { getToStringValue } = require('playwright/lib/server/frames');6const page = await browser.newPage();7const value = await getToStringValue(page, {objectHandle: someHandle});8console.log(value);9const { getToStringValue } = require('playwright/lib/server/frames');10const page = await browser.newPage();11const value = await getToStringValue(page, {objectHandle: someHandle});12console.log(value);13const { getToStringValue } = require('playwright/lib/server/frames');

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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