How to Upload Blobs to a Server Using jQuery and FormData?

Uploading Blobs Using JavaScript

When handling multimedia data within web applications, such as audio or video, it often becomes necessary to upload these files to a remote server. In JavaScript, there are multiple methods to accomplish this task.

One common approach involves using jQuery's $.post() method. However, when working with Blobs, certain modifications are required to successfully upload the data.

Solution Using FormData API

To upload a Blob using jQuery, it is necessary to use the FormData API. This API provides a mechanism for constructing form data and attaching additional data, such as Blobs, to the request.

Here's how you can use the FormData API with jQuery's $.post() method to upload a Blob:

<code class="javascript">var fd = new FormData();
fd.append('fname', 'test.wav');
fd.append('data', soundBlob);

$.ajax({
    type: 'POST',
    url: '/upload.php',
    data: fd,
    processData: false,
    contentType: false
}).done(function(data) {
       console.log(data);
});</code>

In this code:

1. A FormData object (fd) is created.
2. The 'fname' and 'data' keys are added to the form data. 'fname' represents the desired filename on the server, while 'data' contains the sound Blob.
3. jQuery's $.ajax() method is used to perform the request.
4. The processData and contentType options are set to false. This is important because $.ajax() automatically transforms the form data into a query string, which is not suitable for Blobs.

By using the FormData API and omitting the default processing behavior of $.ajax(), this code successfully uploads the Blob to the server.

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