How do I handle element visibility checks within a scrollable container in Puppeteer?
Antek N

Handling element visibility checks within a scrollable container in Puppeteer involves a combination of scrolling the container and checking the visibility of the desired elements. Here's a detailed explanation of how to handle element visibility checks within a scrollable container in Puppeteer: 1. Launching a new browser instance and creating a new page:

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   const puppeteer = require('puppeteer');

   (async () => {
     const browser = await puppeteer.launch();
     const page = await browser.newPage();

     // Perform actions with the page here

     // Close the browser
     await browser.close();
   })();

This code sets up a basic Puppeteer script. It launches a new headless browser instance and creates a new page to work with. 2. Handling element visibility checks within a scrollable container: To handle element visibility checks within a scrollable container, you need to follow these steps: - Scroll the container to bring the desired elements into view: Use Puppeteer'spage.evaluate() function to execute JavaScript code within the page's context and scroll the container to bring the desired elements into view. You can scroll vertically or horizontally depending on the scroll direction required. - Check the visibility of the elements: After scrolling the container, use Puppeteer's DOM manipulation methods to select the desired elements and check their visibility using theelementHandle.boundingBox() method. If the bounding box of an element exists and has a positive width and height, it is considered visible. - Repeat the scrolling process if needed: If the desired elements are still not fully visible after scrolling, you can repeat the scrolling process until the elements become visible or until you reach a maximum scroll limit.

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   async function checkElementVisibility(containerSelector, elementSelector) {
     const container = await page.$(containerSelector);
     const elements = await page.$$(elementSelector);

     for (const element of elements) {
       let isVisible = false;

       while (!isVisible) {
         await page.evaluate((el) => {
           el.scrollIntoView();
         }, container);

         const boundingBox = await element.boundingBox();
         isVisible = boundingBox && boundingBox.width > 0 && boundingBox.height > 0;
       }

       console.log('Element is visible:', elementSelector);
     }
   }

   const containerSelector = '#scrollableContainer';
   const elementSelector = '.targetElement';

   await checkElementVisibility(containerSelector, elementSelector);

In this example, thecheckElementVisibility() function is defined to handle the visibility checks within a scrollable container. It takes two parameters:containerSelector for selecting the scrollable container element andelementSelector for selecting the desired elements within the container. Inside the function, the container element is selected usingpage.$(), and the desired elements are selected usingpage.$$(). The function then iterates over each element and scrolls the container until the element becomes visible. It uses awhile loop to repeatedly scroll and check the visibility of the element until it is fully visible. Once the element is visible, a log statement is printed. By utilizing this approach, you can handle element visibility checks within a scrollable container in Puppeteer. This is useful when working with dynamically loaded or lazily rendered content within a scrollable area, allowing you to ensure that the desired elements are visible and accessible before interacting with them or extracting data.

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