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How to Download Files Using JavaScript and AJAX

Aug 18, 2024

Are you looking for a way to download files from the server using JavaScript and AJAX? Well, you're in luck! In this tutorial, we'll go over how to use JavaScript and AJAX to download files from the server in a few simple steps.

Step 1: Set Up Your HTML

First, let's create a button in your HTML to trigger the file download. You can use a simple HTML button element and add an onclick event to trigger the download function.

Step 2: Write the JavaScript Function

Next, let's write the JavaScript function to handle the file download. We can use the fetch API to make a request to the server and download the file. Here's an example of how you can write the function:

```javascript

function downloadFile() {

fetch('http://example.com/file.pdf')

.then(response => response.blob())

.then(blob => {

let url = window.URL.createObjectURL(blob);

let a = document.createElement('a');

a.href = url;

a.download = 'file.pdf';

document.body.appendChild(a);

a.click();

window.URL.revokeObjectURL(url);

});

}

```

In this example, we're using the fetch API to make a request to the server to download the file. Once we have the file data, we create a URL for the file and create a new element with the download attribute set to the file name. We then append the element to the document, trigger a click event on the element, and finally revoke the URL to clean up after the download.

Step 3: Trigger the Download

Now that we have our download function set up, we can trigger it when the user clicks the download button we created in step 1.

And that's it! With just a few lines of code, you can use JavaScript and AJAX to download files from the server. Whether you're building a file management system or just need to provide a download link for your website, this method is a quick and efficient way to get files from the server to the client.

I hope you found this tutorial helpful! Thanks for watching and happy coding!

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