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How to use _preparePageForScreenshot method in Playwright Internal

Best JavaScript code snippet using playwright-internal

screenshotter.js

...56    return this._queue.postTask(async () => {57      const {58        viewportSize59      } = await this._originalViewportSize(progress);60      await this._preparePageForScreenshot(progress, options.animations === 'disabled');61      progress.throwIfAborted(); // Avoid restoring after failure - should be done by cleanup.62      if (options.fullPage) {63        const fullPageSize = await this._fullPageSize(progress);64        let documentRect = {65          x: 0,66          y: 0,67          width: fullPageSize.width,68          height: fullPageSize.height69        };70        const fitsViewport = fullPageSize.width <= viewportSize.width && fullPageSize.height <= viewportSize.height;71        if (options.clip) documentRect = trimClipToSize(options.clip, documentRect);72        const buffer = await this._screenshot(progress, format, documentRect, undefined, fitsViewport, options);73        progress.throwIfAborted(); // Avoid restoring after failure - should be done by cleanup.74        await this._restorePageAfterScreenshot();75        return buffer;76      }77      const viewportRect = options.clip ? trimClipToSize(options.clip, viewportSize) : {78        x: 0,79        y: 0,80        ...viewportSize81      };82      const buffer = await this._screenshot(progress, format, undefined, viewportRect, true, options);83      progress.throwIfAborted(); // Avoid restoring after failure - should be done by cleanup.84      await this._restorePageAfterScreenshot();85      return buffer;86    });87  }88  async screenshotElement(progress, handle, options) {89    const format = validateScreenshotOptions(options);90    return this._queue.postTask(async () => {91      const {92        viewportSize93      } = await this._originalViewportSize(progress);94      await this._preparePageForScreenshot(progress, options.animations === 'disabled');95      progress.throwIfAborted(); // Do not do extra work.96      await handle._waitAndScrollIntoViewIfNeeded(progress);97      progress.throwIfAborted(); // Do not do extra work.98      const boundingBox = await handle.boundingBox();99      (0, _utils.assert)(boundingBox, 'Node is either not visible or not an HTMLElement');100      (0, _utils.assert)(boundingBox.width !== 0, 'Node has 0 width.');101      (0, _utils.assert)(boundingBox.height !== 0, 'Node has 0 height.');102      const fitsViewport = boundingBox.width <= viewportSize.width && boundingBox.height <= viewportSize.height;103      progress.throwIfAborted(); // Avoid extra work.104      const scrollOffset = await this._page.mainFrame().waitForFunctionValueInUtility(progress, () => ({105        x: window.scrollX,106        y: window.scrollY107      }));108      const documentRect = { ...boundingBox109      };110      documentRect.x += scrollOffset.x;111      documentRect.y += scrollOffset.y;112      const buffer = await this._screenshot(progress, format, _helper.helper.enclosingIntRect(documentRect), undefined, fitsViewport, options);113      progress.throwIfAborted(); // Avoid restoring after failure - should be done by cleanup.114      await this._restorePageAfterScreenshot();115      return buffer;116    });117  }118  async _preparePageForScreenshot(progress, disableAnimations) {119    await Promise.all(this._page.frames().map(async frame => {120      await frame.nonStallingEvaluateInExistingContext('(' + function (disableAnimations) {121        const styleTag = document.createElement('style');122        styleTag.textContent = `123          *:not(#playwright-aaaaaaaaaa.playwright-bbbbbbbbbbb.playwright-cccccccccc.playwright-dddddddddd.playwright-eeeeeeeee) {124            caret-color: transparent !important;125          }126        `;127        document.documentElement.append(styleTag);128        const infiniteAnimationsToResume = new Set();129        const cleanupCallbacks = [];130        if (disableAnimations) {131          const collectRoots = (root, roots = []) => {132            roots.push(root);...

Using AI Code Generation

1(async () => {2  const browser = await chromium.launch({ headless: false });3  const context = await browser.newContext();4  const page = await context.newPage();5  await page._preparePageForScreenshot();6  await page.screenshot({ path: 'google.png' });7  await browser.close();8})();9const playwright = require('playwright');10exports.handler = async (event) => {11  const browser = await playwright.chromium.launch();12  const page = await browser.newPage();13  await page.screenshot({ path: 'google.png' });14  await browser.close();15  return {16    body: JSON.stringify('Hello from Lambda!'),17  };18};

Using AI Code Generation

1const { _preparePageForScreenshot } = require('playwright/lib/server/chromium/crPage');2const browser = await chromium.launch();3const context = await browser.newContext();4const page = await context.newPage();5await _preparePageForScreenshot(page);6await page.screenshot({ path: 'test.png' });7await browser.close();8const { _screenshotStitch } = require('playwright/lib/server/chromium/crPage');9const browser = await chromium.launch();10const context = await browser.newContext();11const page = await context.newPage();12await page.screenshot({ path: 'test.png' });13await browser.close();14const { _screenshotStitch } = require('playwright/lib/server/chromium/crPage');15const browser = await chromium.launch();16const context = await browser.newContext();17const page = await context.newPage();18await page.pdf({ path: 'test.pdf' });19await browser.close();

Using AI Code Generation

1const { _preparePageForScreenshot } = require('playwright/lib/server/chromium/crPage.js');2const { chromium } = require('playwright');3(async () => {4  const browser = await chromium.launch({ headless: false });5  const page = await browser.newPage();6  await page.screenshot({ path: 'example.png' });7  await browser.close();8})();9const { _preparePageForScreenshot } = require('playwright/lib/server/chromium/crPage.js');10const { chromium } = require('playwright');11(async () => {12  const browser = await chromium.launch({ headless: false });13  const page = await browser.newPage();14  await _preparePageForScreenshot(page);15  await page.screenshot({ path: 'example.png' });16  await browser.close();17})();18const { _preparePageForScreenshot } = require('playwright/lib/server/chromium/crPage.js');19const { chromium } = require('playwright');20(async () => {21  const browser = await chromium.launch({ headless: false });22  const page = await browser.newPage();23  await _preparePageForScreenshot(page);24  await page.evaluate(() => {25    document.body.style.backgroundColor = 'red';26  });27  await page.screenshot({ path: 'example.png' });28  await browser.close();29})();30const { _preparePageForScreenshot } = require('playwright/lib/server/chromium/crPage.js');31const { chromium } = require('playwright');32(async () => {33  const browser = await chromium.launch({ headless: false });34  const page = await browser.newPage();35  await _preparePageForScreenshot(page);36  await page.evaluate(() => {37    document.body.style.backgroundColor = 'red';38  });39  await page.screenshot({ path: 'example.png' });40  await browser.close();41})();42const { _preparePageForScreenshot } = require('playwright/lib/server/chromium/crPage.js');43const { chromium } =

Using AI Code Generation

1const { _preparePageForScreenshot } = require('playwright/lib/server/chromium/crPage');2const { chromium } = require('playwright');3const fs = require('fs');4(async () => {5  const browser = await chromium.launch();6  const context = await browser.newContext();7  const page = await context.newPage();8  await page.waitForLoadState('networkidle');9  const screenshot = await _preparePageForScreenshot(page, 'png', {});10  fs.writeFileSync('screenshot.png', screenshot);11  await browser.close();12})();13const { _preparePageForScreenshot } = require('playwright/lib/server/chromium/crPage');14const { chromium } = require('playwright');15const fs = require('fs');16(async () => {17  const browser = await chromium.launch();18  const context = await browser.newContext();19  const page = await context.newPage();20  await page.waitForLoadState('networkidle');21  const screenshot = await _preparePageForScreenshot(page, 'png', {});22  fs.writeFileSync('screenshot.png', screenshot);23  await browser.close();24})();

Using AI Code Generation

1const { _preparePageForScreenshot } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');2const path = require('path');3const fs = require('fs');4(async () => {5    const browser = await chromium.launch();6    const context = await browser.newContext();7    const page = await context.newPage();8    const screenshot = await _preparePageForScreenshot(page);9    fs.writeFileSync(path.join(__dirname, 'screenshot.png'), screenshot);10    await browser.close();11})();

Using AI Code Generation

1const { _preparePageForScreenshot } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');2const { _preparePageForScreenshot } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');3const { _preparePageForScreenshot } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');4const { _preparePageForScreenshot } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');5const { _preparePageForScreenshot } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');6const { _preparePageForScreenshot } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');7const { _preparePageForScreenshot } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');8const { _preparePageForScreenshot } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');9const { _preparePageForScreenshot } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');10const { _preparePageForScreenshot } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');11const { _preparePageForScreenshot } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');12const { _preparePageForScreenshot } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');

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    await page.screenshot({path: 'google.png'});7    await browser.close();8})();9const {chromium} = require('playwright');10(async () => {11    const browser = await chromium.launch();12    const context = await browser.newContext();13    const page = await context.newPage();14    await page.screenshot({path: 'google.png'});15    await browser.close();16})();17const {chromium} = require('playwright');18(async () => {19    const browser = await chromium.launch();20    const context = await browser.newContext();21    const page = await context.newPage();22    await page._preparePageForScreenshot();23    await page.screenshot({path: 'google.png'});24    await browser.close();25})();26Your name to display (optional):27Your name to display (optional):28Hey @sourav, I think the issue is that you are calling _preparePageForScreenshot() before calling goto() . You need to call goto() first and then call _prep

StackOverFlow community discussions

Questions

Discussion

Running Playwright in Azure Function

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

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

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

firefox browser does not start in playwright

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

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

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

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

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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