Simple file upload using jQuery and AJAX

Here’s something that came in helpful the other day at work – “Simple file upload using jQuery and AJAX“.  We were on the right track, but this blog post helped iron out the last few details.  In particular, this bit:

        url: 'submit.php?files',
        type: 'POST',
        data: data,
        cache: false,
        dataType: 'json',
        processData: false, // Don't process the files
        contentType: false, // Set content type to false as jQuery will tell the server its a query string request
        success: function(data, textStatus, jqXHR)
            if(typeof data.error === 'undefined')
                // Success so call function to process the form
                submitForm(event, data);
                // Handle errors here
                console.log('ERRORS: ' + data.error);
        error: function(jqXHR, textStatus, errorThrown)
            // Handle errors here
            console.log('ERRORS: ' + textStatus);

And a clarification of the parameters:

2 attributes need to be set to false:

  • processData – Because jQuery will convert the files arrays into strings and the server can’t pick it up.
  • contentType – Set this to false because jQuery defaults toapplication/x-www-form-urlencoded and doesn’t send the files. Also setting it to multipart/form-data doesn’t seem to work either.

There’s a GitHub repository with all the necessary example code.

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