Ajax transports to allow the sending/receiving of blobs and array buffers via the familiar jquery ajax function.To send, set data to the blob or arraybuffer to be sent, and add 'processData:false' to the ajax options.To receive, specify the 'dataType' as blob or arraybuffer in the ajax options.

jquery-ajax-blob-arraybuffer.js

(function($){
    /**
     * Register ajax transports for blob send/recieve and array buffer send/receive via XMLHttpRequest Level 2
     * within the comfortable framework of the jquery ajax request, with full support for promises.
     *
     * Notice the +* in the dataType string? The + indicates we want this transport to be prepended to the list
     * of potential transports (so it gets first dibs if the request passes the conditions within to provide the
     * ajax transport, preventing the standard transport from hogging the request), and the * indicates that
     * potentially any request with any dataType might want to use the transports provided herein.
     *
     * Remember to specify 'processData:false' in the ajax options when attempting to send a blob or arraybuffer -
     * otherwise jquery will try (and fail) to convert the blob or buffer into a query string.
     *
     * This revision now includes sending headers, resolves the stack overflow in abort(), and sets the status text
     * into the response if the request is unsuccessful.
     */
    $.ajaxTransport("+*", function(options, originalOptions, jqXHR){
        // Test for the conditions that mean we can/want to send/receive blobs or arraybuffers - we need XMLHttpRequest
        // level 2 (so feature-detect against window.FormData), feature detect against window.Blob or window.ArrayBuffer,
        // and then check to see if the dataType is blob/arraybuffer or the data itself is a Blob/ArrayBuffer
        if (window.FormData && ((options.dataType && (options.dataType == 'blob' || options.dataType == 'arraybuffer'))
            || (options.data && ((window.Blob && options.data instanceof Blob)
                || (window.ArrayBuffer && options.data instanceof ArrayBuffer)))
            ))
        {
            var xhr;

            return {
                /**
                 * Return a transport capable of sending and/or receiving blobs - in this case, we instantiate
                 * a new XMLHttpRequest and use it to actually perform the request, and funnel the result back
                 * into the jquery complete callback (such as the success function, done blocks, etc.)
                 *
                 * @param headers
                 * @param completeCallback
                 */
                send: function(headers, completeCallback){
                    var url = options.url || window.location.href,
                        type = options.type || 'GET',
                        dataType = options.dataType || 'text',
                        data = options.data || null,
                        async = options.async || true;

                    xhr = new XMLHttpRequest();
                    xhr.addEventListener('load', function(){
                        var res = {},
                            success = xhr.status >= 200 && xhr.status < 300 || xhr.status === 304;

                        if (success){
                            res[dataType] = xhr.response;
                        } else {
                            res.text = xhr.statusText;
                        }

                        completeCallback(xhr.status, xhr.statusText, res, xhr.getAllResponseHeaders());
                    });

                    xhr.open(type, url, async);
                    xhr.responseType = dataType;

                    for (var key in headers){
                        if (headers.hasOwnProperty(key)){
                            xhr.setRequestHeader(key, headers[key]);
                        }
                    }

                    xhr.send(data);
                },
                abort: function(){
                    if (xhr){
                        xhr.abort();
                    }
                }
            };
        }
    });
})(jQuery);

Hi.
Thanks a lot for the code!

Does this send headers too? I don't see you using them anywhere.

Thanks.

Hey @miguelcobain,

Does this send headers too? I don't see you using them anywhere.

No, it doesn’t. I’ve created a fork that does: https://gist.github.com/aaronk6/bff7cc600d863d31a7bf

Cheers!

Thanks a lot for the code!

Does this send headers too?

It does now.

👍

cool!

i try to use jQuery.ajaxSetup() to solve this issue, but fail.

thank you for your code~

Line 42：async = options.async || true;

async is true always without false, even though I set options.async = false.

This is wonderful. One suggestion: Add a link back to this page to the headnotes in the JS. That'll make it possible for folks to keep track of where they got it from if it ever had a bug or whatever.

Thanks so much for this! This solved a problem I was having where I wanted to download a PDF using the $.ajax method (POST request) and then add the resulting ArrayBuffer to a zip file using the JSZip library.