如何在jQuery 1.5中获取纯XMLHTTPRequest对象？

我的代码在jquery 1.4中工作正常，我尝试将其升级到1.5。 但是这部分代码停止工作 – 它的标准beforeSend处理程序

beforeSend: function (xhr, options) { // __forced_abort = false; // xhr.upload.addEventListener('progress', on_progress, false); xhr.upload.addEventListener('load', on_loaded, false); xhr.addEventListener('abort', on_abort, false); .... 

我知道在1.5还没有真正的xhr – 只是jqXHR高级抽象，似乎是jqXHR没有上传属性。

问题：如何在jQuery 1.5中获得纯（旧）xhr对象？

Answer 1

如果您的beforeSend是全球性的：

 var oldXHR = jQuery.ajaxSettings.xhr; jQuery.ajaxSettings.xhr = function() { var xhr = oldXHR(); if(xhr instanceof window.XMLHttpRequest) { xhr.upload.addEventListener('progress', on_progress, false); xhr.upload.addEventListener('load', on_loaded, false); xhr.addEventListener('abort', on_abort, false); } return xhr; }; 

如果您的beforeSend特定于特定请求：

 $.ajax({ xhr: function() { var xhr = jQuery.ajaxSettings.xhr(); if(xhr instanceof window.XMLHttpRequest) { xhr.upload.addEventListener('progress', on_progress, false); xhr.upload.addEventListener('load', on_loaded, false); xhr.addEventListener('abort', on_abort, false); } return xhr; } }); 

Answer 2

扩展Raphaels答案包括百分比……

  $.ajax({ type: 'POST', success: function(data) { } xhr: function() { var xhr = jQuery.ajaxSettings.xhr(); if(xhr instanceof window.XMLHttpRequest) { xhr.upload.addEventListener('progress', function(){ var percent = 0; var position = event.loaded || event.position; /*event.position is deprecated*/ var total = event.total; if (event.lengthComputable) { percent = Math.ceil(position / total * 100); } var percentVal = percent+ '%'; $('#progressBar').css('width',percentVal); $('#uploadPercentage').html(' '+percentVal); }, false); } return xhr; }, }); 

Answer 3

尝试使用jQuery.ajaxSettings.xhr（）