(function($){
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/**
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* Register ajax transports for blob send/recieve and array buffer send/receive via XMLHttpRequest Level 2
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* within the comfortable framework of the jquery ajax request, with full support for promises.
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*
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* Notice the +* in the dataType string? The + indicates we want this transport to be prepended to the list
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* of potential transports (so it gets first dibs if the request passes the conditions within to provide the
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* ajax transport, preventing the standard transport from hogging the request), and the * indicates that
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* potentially any request with any dataType might want to use the transports provided herein.
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*
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* Remember to specify 'processData:false' in the ajax options when attempting to send a blob or arraybuffer -
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* otherwise jquery will try (and fail) to convert the blob or buffer into a query string.
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*
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* This revision now includes sending headers, resolves the stack overflow in abort(), and sets the status text
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* into the response if the request is unsuccessful.
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*/
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$.ajaxTransport("+*", function(options, originalOptions, jqXHR){
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// Test for the conditions that mean we can/want to send/receive blobs or arraybuffers - we need XMLHttpRequest
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// level 2 (so feature-detect against window.FormData), feature detect against window.Blob or window.ArrayBuffer,
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// and then check to see if the dataType is blob/arraybuffer or the data itself is a Blob/ArrayBuffer
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if (window.FormData && ((options.dataType && (options.dataType == 'blob' || options.dataType == 'arraybuffer'))
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|| (options.data && ((window.Blob && options.data instanceof Blob)
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|| (window.ArrayBuffer && options.data instanceof ArrayBuffer)))
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))
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{
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var xhr;
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return {
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/**
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* Return a transport capable of sending and/or receiving blobs - in this case, we instantiate
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* a new XMLHttpRequest and use it to actually perform the request, and funnel the result back
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* into the jquery complete callback (such as the success function, done blocks, etc.)
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*
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* @param headers
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* @param completeCallback
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*/
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send: function(headers, completeCallback){
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var url = options.url || window.location.href,
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type = options.type || 'GET',
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dataType = options.dataType || 'text',
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data = options.data || null,
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async = options.async || true;
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xhr = new XMLHttpRequest();
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xhr.addEventListener('load', function(){
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var res = {},
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success = xhr.status >= 200 && xhr.status < 300 || xhr.status === 304;
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if (success){
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res[dataType] = xhr.response;
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} else {
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res.text = xhr.statusText;
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}
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completeCallback(xhr.status, xhr.statusText, res, xhr.getAllResponseHeaders());
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});
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xhr.open(type, url, async);
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xhr.responseType = dataType;
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for (var key in headers){
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if (headers.hasOwnProperty(key)){
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xhr.setRequestHeader(key, headers[key]);
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}
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}
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xhr.send(data);
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},
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abort: function(){
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if (xhr){
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xhr.abort();
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}
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}
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};
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}
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});
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})(jQuery);
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