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How to use rawEvaluateJSON method in Playwright Internal

Best JavaScript code snippet using playwright-internal

javascript.js

Source:javascript.js

...55  }56  createHandle(remoteObject) {57    return this._delegate.createHandle(this, remoteObject);58  }59  async rawEvaluateJSON(expression) {60    return await this._delegate.rawEvaluateJSON(expression);61  }62  async doSlowMo() {// overridden in FrameExecutionContext63  }64}65exports.ExecutionContext = ExecutionContext;66class JSHandle extends _instrumentation.SdkObject {67  constructor(context, type, preview, objectId, value) {68    super(context, 'handle');69    this._context = void 0;70    this._disposed = false;71    this._objectId = void 0;72    this._value = void 0;73    this._objectType = void 0;74    this._preview = void 0;...

crExecutionContext.js

Source:crExecutionContext.js

...32    this._contextId = void 0;33    this._client = client;34    this._contextId = contextPayload.id;35  }36  async rawEvaluateJSON(expression) {37    const {38      exceptionDetails,39      result: remoteObject40    } = await this._client.send('Runtime.evaluate', {41      expression,42      contextId: this._contextId,43      returnByValue: true44    }).catch(rewriteError);45    if (exceptionDetails) throw new js.JavaScriptErrorInEvaluate((0, _crProtocolHelper.getExceptionMessage)(exceptionDetails));46    return remoteObject.value;47  }48  async rawEvaluateHandle(expression) {49    const {50      exceptionDetails,...

ffExecutionContext.js

Source:ffExecutionContext.js

...31    this._executionContextId = void 0;32    this._session = session;33    this._executionContextId = executionContextId;34  }35  async rawEvaluateJSON(expression) {36    const payload = await this._session.send('Runtime.evaluate', {37      expression,38      returnByValue: true,39      executionContextId: this._executionContextId40    }).catch(rewriteError);41    checkException(payload.exceptionDetails);42    return payload.result.value;43  }44  async rawEvaluateHandle(expression) {45    const payload = await this._session.send('Runtime.evaluate', {46      expression,47      returnByValue: false,48      executionContextId: this._executionContextId49    }).catch(rewriteError);...

wkExecutionContext.js

Source:wkExecutionContext.js

...30    this._contextId = void 0;31    this._session = session;32    this._contextId = contextId;33  }34  async rawEvaluateJSON(expression) {35    try {36      const response = await this._session.send('Runtime.evaluate', {37        expression,38        contextId: this._contextId,39        returnByValue: true40      });41      if (response.wasThrown) throw new js.JavaScriptErrorInEvaluate(response.result.description);42      return response.result.value;43    } catch (error) {44      throw rewriteError(error);45    }46  }47  async rawEvaluateHandle(expression) {48    try {...

Using AI Code Generation

1const playwright = require('playwright');2(async () => {3  const browser = await playwright.chromium.launch();4  const context = await browser.newContext();5  const page = await context.newPage();6  const result = await page.evaluate(() => {7    return document.title;8  });9  console.log(result);10  await browser.close();11})();

Using AI Code Generation

1(async () => {2    const {chromium} = require('playwright');3    const browser = await chromium.launch();4    const context = await browser.newContext();5    const page = await context.newPage();6    const result = await page.evaluate(async () => {7        const { rawEvaluateJSON } = window.playwright;8        return await rawEvaluateJSON('window.location.href');9    });10    console.log(result);11    await browser.close();12})();

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const context = await browser.newContext();5  const page = await context.newPage();6  const rawResponse = await page.evaluateHandle(() => {7  });8  const json = await rawResponse.evaluateHandle((rawResponse) => {9    return rawResponse.json();10  });11  console.log(await json.jsonValue());12  await browser.close();13})();14rawEvaluateJSON is a shorthand for calling rawEvaluate and then calling jsonValue() on the result. It is a convenience method and is equivalent to:15const json = await rawEvaluate(page, () => {16});17console.log(await json);18rawEvaluateHandle is a shorthand for calling rawEvaluate and then calling evaluateHandle() on the result. It is a convenience method and is equivalent to:19const rawResponse = await rawEvaluate(page, () => {20});21const json = await rawResponse.evaluateHandle(r => r.json());22console.log(await json.jsonValue());23rawEvaluateExpression is a shorthand for calling rawEvaluate and then calling evaluateExpression() on the result. It is a convenience method and is equivalent to:24const json = await rawEvaluate(page, () => {25});26console.log(await json.evaluateExpression('json => json'));27rawEvaluateExpressionHandle is a shorthand for calling rawEvaluate and then calling evaluateExpressionHandle() on the result. It is a convenience method and is equivalent to:28const rawResponse = await rawEvaluate(page, () => {29});30const json = await rawResponse.evaluateExpressionHandle('rawResponse => rawResponse.json()');31console.log(await json.json

Using AI Code Generation

1const playwright = require('playwright');2(async () => {3  const browser = await playwright.chromium.launch();4  const page = await browser.newPage();5  const result = await page.evaluate(() => {6    return document.querySelector('.navbar__inner').innerText;7  });8  console.log(result);9  await browser.close();10})();11const playwright = require('playwright');12(async () => {13  const browser = await playwright.chromium.launch();14  const page = await browser.newPage();15  const result = await page.rawEvaluateJSON(() => {16    return document.querySelector('.navbar__inner').innerText;17  });18  console.log(result);19  await browser.close();20})();21rawEvaluateJSON(pageFunction, ...args)22const playwright = require('playwright');23(async () => {24  const browser = await playwright.chromium.launch();25  const page = await browser.newPage();26  const result = await page.rawEvaluateJSON(() => {27    return document.querySelector('.navbar__

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const page = await browser.newPage();5  const result = await page.evaluate(() => {6    return document.title;7  });8  console.log(result);9  await browser.close();10})();11const { chromium } = require('playwright');12(async () => {13  const browser = await chromium.launch();14  const page = await browser.newPage();15  const result = await page.evaluate(() => {16    return document.title;17  });18  console.log(result);19  await browser.close();20})();21const { chromium } = require('playwright');22(async () => {23  const browser = await chromium.launch();24  const page = await browser.newPage();25  const result = await page.evaluate(() => {26    return document.title;27  });28  console.log(result);29  await browser.close();30})();31const { chromium } = require('playwright');32(async () => {33  const browser = await chromium.launch();34  const page = await browser.newPage();35  const result = await page.evaluate(() => {36    return document.title;37  });38  console.log(result);39  await browser.close();40})();41const { chromium } = require('playwright');42(async () => {43  const browser = await chromium.launch();44  const page = await browser.newPage();45  const result = await page.evaluate(() => {46    return document.title;47  });48  console.log(result);49  await browser.close();50})();51const { chromium } = require('playwright');52(async () => {53  const browser = await chromium.launch();54  const page = await browser.newPage();55  const result = await page.evaluate(() => {56    return document.title;57  });58  console.log(result);

Using AI Code Generation

1const { rawEvaluateJSON } = require('playwright');2const { chromium } = require('playwright');3(async () => {4  const browser = await chromium.launch();5  const page = await browser.newPage();6  const result = await rawEvaluateJSON(page, () => {7    const title = document.querySelector('title').textContent;8    return { title };9  });10  console.log(result);11  await browser.close();12})();13const { rawEvaluate } = require('playwright');14const { chromium } = require('playwright');15(async () => {16  const browser = await chromium.launch();17  const page = await browser.newPage();18  const result = await rawEvaluate(page, () => {19    const title = document.querySelector('title').textContent;20    return { title };21  });22  console.log(result);23  await browser.close();24})();25const { rawEvaluateHandle } = require('playwright');26const { chromium } = require('playwright');27(async () => {28  const browser = await chromium.launch();29  const page = await browser.newPage();30  const result = await rawEvaluateHandle(page, () => {31    const title = document.querySelector('title').textContent;32    return { title };33  });34  console.log(result);35  await browser.close();36})();37const { rawClick } = require('playwright');38const { chromium } = require('playwright');39(async () => {40  const browser = await chromium.launch();41  const page = await browser.newPage();42  await rawClick(page, '#js-link-box-en');43  await browser.close();44})();45const { rawTap } = require('playwright');46const { chromium } = require('playwright');47(async () => {48  const browser = await chromium.launch();49  const page = await browser.newPage();50  await rawTap(page, '#js-link-box-en');

Using AI Code Generation

1const playwright = require('playwright');2(async () => {3  const browser = await playwright['chromium'].launch();4  const page = await browser.newPage();5  const title = await page.evaluate(() => document.title);6  console.log(title);7  await browser.close();8})();9const playwright = require('playwright');10(async () => {11  const browser = await playwright['chromium'].launch();12  const page = await browser.newPage();13  const title = await page.evaluate(() => document.title);14  console.log(title);15  await browser.close();16})();17const puppeteer = require('puppeteer');18(async () => {19  const browser = await puppeteer.launch();20  const page = await browser.newPage();21  const title = await page.evaluate(() => document.title);22  console.log(title);23  await browser.close();24})();25const playwright = require('playwright');26(async () => {27  const browser = await playwright['chromium'].launch();28  const page = await browser.newPage();29  const title = await page.evaluate(() => document.title);30  console.log(title);31  await browser.close();32})();33const puppeteer = require('puppeteer');34(async () => {35  const browser = await puppeteer.launch();36  const page = await browser.newPage();37  const title = await page.evaluate(() => document.title);38  console.log(title);39  await browser.close();40})();41const puppeteer = require('puppeteer');42(async () => {43  const browser = await puppeteer.launch();44  const page = await browser.newPage();45  const title = await page.evaluate(() => document.title);46  console.log(title);47  await browser.close();48})();49const playwright = require('playwright');50(async () => {51  const browser = await playwright['chromium'].launch();52  const page = await browser.newPage();53  const title = await page.evaluate(() => document.title);54  console.log(title);55  await browser.close();56})();57const playwright = require('playwright');

Using AI Code Generation

1const rawEvaluateJSON = require('playwright/lib/internal/evaluators').rawEvaluateJSON;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 result = await rawEvaluateJSON(page, 'document.title');8  console.log(result);9  await browser.close();10})();

Using AI Code Generation

1const playwright = require('playwright');2const { chromium } = require('playwright');3const fs = require('fs');4const path = require('path');5(async () => {6  const browser = await chromium.launch({ headless: false });7  const context = await browser.newContext();8  const page = await context.newPage();9  const result = await page.evaluate(() => {10    return JSON.stringify({foo: 'bar'});11  });12  console.log(result);13  await browser.close();14})();15{"foo":"bar"}16const playwright = require('playwright');17const { chromium } = require('playwright');18const fs = require('fs');19const path = require('path');20(async () => {21  const browser = await chromium.launch({ headless: false });22  const context = await browser.newContext();23  const page = await context.newPage();24  const result = await page.rawEvaluateJSON(() => {25    return {foo: 'bar'};26  });27  console.log(result);28  await browser.close();29})();30{ foo: 'bar' }31const playwright = require('playwright');32const { chromium } = require('playwright');33const fs = require('fs');34const path = require('path');35(async () => {36  const browser = await chromium.launch({ headless: false });37  const context = await browser.newContext();38  const page = await context.newPage();39  const result = await page.rawEvaluateJSON(() => {40    return {foo: 'bar'};41  });42  console.log(result);43  await browser.close();44})();45{ foo: 'bar' }46const playwright = require('playwright');47const { chromium } = require('playwright');48const fs = require('fs');49const path = require('path');50(async () => {51  const browser = await chromium.launch({ headless: false });

Using AI Code Generation

1const internalContext = page.context();2const result = await internalContext.rawEvaluateJSON('() => ({foo: 42})');3const result = await page.rawEvaluateJSON('() => ({foo: 42})');4const result = await frame.rawEvaluateJSON('() => ({foo: 42})');5const result = await worker.rawEvaluateJSON('() => ({foo: 42})');6const result = await browserContext.rawEvaluateJSON('() => ({foo: 42})');7const result = await browser.rawEvaluateJSON('() => ({foo: 42})');8const result = await browserServer.rawEvaluateJSON('() => ({foo: 42})');9const result = await browserType.rawEvaluateJSON('() => ({foo: 42})');10const result = await elementHandle.rawEvaluateJSON('() => ({foo: 42})');11const result = await jsHandle.rawEvaluateJSON('() => ({foo: 42})');12const result = await selectors.rawEvaluateJSON('() => ({foo: 42})');

StackOverFlow community discussions

Questions

Discussion

Running Playwright in Azure Function

firefox browser does not start in playwright

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

firefox browser does not start in playwright

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

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

I played with your example for a while and I got the same errors. These are the things I found that made my example work:

It must be Linux. I know that you mentioned that you picked a Linux plan. But I found that in VS Code that part is hidden, and on the Web the default is Windows. This is important because only the Linux plan runs npm install on the server.

Make sure that you are building on the server. You can find this option in the VS Code Settings:

Make sure you set the environment variable PLAYWRIGHT_BROWSERS_PATH, before making the publish.

https://stackoverflow.com/questions/63949978/running-playwright-in-azure-function

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

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

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

Check out the latest blogs from LambdaTest on this topic:

Appium: Endgame and What’s Next? [Testμ 2022]

The automation backend architecture of Appium has undergone significant development along with the release of numerous new capabilities. With the advent of Appium, test engineers can cover mobile apps, desktop apps, Flutter apps, and more.

What Agile Testing (Actually) Is

So, now that the first installment of this two fold article has been published (hence you might have an idea of what Agile Testing is not in my opinion), I’ve started feeling the pressure to explain what Agile Testing actually means to me.

Why Agile Teams Have to Understand How to Analyze and Make adjustments

How do we acquire knowledge? This is one of the seemingly basic but critical questions you and your team members must ask and consider. We are experts; therefore, we understand why we study and what we should learn. However, many of us do not give enough thought to how we learn.

Agile Testing is different – Here is what you need to know

Agile Testing is different- Here is what you need to know.og

Options for Manual Test Case Development & Management

The purpose of developing test cases is to ensure the application functions as expected for the customer. Test cases provide basic application documentation for every function, feature, and integrated connection. Test case development often detects defects in the design or missing requirements early in the development process. Additionally, well-written test cases provide internal documentation for all application processing. Test case development is an important part of determining software quality and keeping defects away from customers.

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:

What is Playwright : Playwright is comparatively new but has gained good popularity. Get to know some history of the Playwright with some interesting facts connected with it.
How To Install Playwright : Learn in detail about what basic configuration and dependencies are required for installing Playwright and run a test. Get a step-by-step direction for installing the Playwright automation framework.
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Run Playwright Tests on LambdaTest: Playwright testing with LambdaTest leverages test performance to the utmost. You can run multiple Playwright tests in Parallel with the LammbdaTest test cloud. Get a step-by-step guide to run your Playwright test on the LambdaTest platform.
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Playwright End To End Testing Tutorial: Get your hands on with Playwright end-to-end testing and learn to use some exciting features such as TraceViewer, Debugging, Networking, Component testing, Visual testing, and many more.
Playwright Video Tutorial: Watch the video tutorials on Playwright testing from experts and get a consecutive in-depth explanation of Playwright automation testing.