Download Binary Data as a File Via Javascript

Question

I'm making an ajax call to an API that returns binary data. I'm wondering if its possible to take that binary data and display it for the client in a new window? This is what I'm doing right now. The problem is, the document opens up, but its completely blank.

$.ajax({
    type: "POST",
    url: apiURL,
    data: xmlRequest,
    complete: function(xhr, status) {
        var bb = new window.WebKitBlobBuilder();

        // Append the binary data to the blob
        bb.append(xhr.responseText);

        var blobURL = window.webkitURL.createObjectURL(bb.getBlob('application/pdf'));
        window.open(blobURL);
    }
});

Any ideas?

Solution

Okay, I figured it out. I had to specify the responseType as 'array buffer':

function downloadPDF() {

    var xhr = new XMLHttpRequest();
    xhr.open('POST', API_URL, true);
    xhr.responseType = 'arraybuffer';

    xhr.onload = function(e) {
        if (this.status == 200) {
            var bb = new window.WebKitBlobBuilder();
            bb.append(this.response); // Note: not xhr.responseText

            var blob = bb.getBlob('application/pdf');
            var blobURL = window.webkitURL.createObjectURL(blob);

            window.open(blobURL);
        }
    };

    xhr.send(createRequest());
}