How do I handle download prompts in Puppeteer?
Rashid D

Handling download prompts in Puppeteer involves modifying the browser's default download behavior using thepage._client.send() method. Here's a detailed explanation of how to handle download prompts 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. Modifying the browser's default download behavior: By using thepage._client.send() method, you can modify the browser's default download behavior and handle download prompts.

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   await page._client.send('Page.setDownloadBehavior', {
     behavior: 'allow',
     downloadPath: '/path/to/save/downloads',
   });

In this example,page._client.send() is called with the'Page.setDownloadBehavior' method to modify the download behavior. Thebehavior property is set to'allow' to allow downloads, and thedownloadPath property is set to the desired path where the downloaded files should be saved. Replace'/path/to/save/downloads' with the actual path on your system. 3. Triggering a download and handling the file: Once the download behavior has been modified, you can trigger a download by interacting with the relevant element or initiating a download programmatically. After the file is downloaded, you can handle it as needed. If you're triggering the download by interacting with an element:

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   await page.click('#downloadButton');

If you're initiating the download programmatically:

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   await page.evaluate(() => {
     const link = document.createElement('a');
     link.href = 'https://example.com/file-to-download.pdf';
     link.download = 'file.pdf';
     document.body.appendChild(link);
     link.click();
     document.body.removeChild(link);
   });

In this code snippet, a new element is created with the desired file URL and name. It's appended to the document, theclick() event is triggered on the element to initiate the download, and then the element is removed from the document. 4. Handling the downloaded file: After the download is complete, you can handle the downloaded file using the file system or any other appropriate method for your use case. By following these steps, you can handle download prompts in Puppeteer. By modifying the browser's default download behavior usingpage._client.send('Page.setDownloadBehavior'), you can allow downloads and specify the download path. You can then trigger the download by interacting with an element or programmatically, and subsequently handle the downloaded file as needed. This functionality enables you to automate file downloads and perform further processing or analysis on the downloaded files within your Puppeteer scripts.

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