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This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

This method is called periodically as an event handler for progress events on XDomainRequests, so that code can monitor progress while loading content.

Note: While handling this event, you can look at XDomainRequest.responseText to get the response so far.

Once loading is complete, the XDomainRequest.onload event handler gets called.


xdr.onprogress = funcRef;


A function to call when progress events occur.


var xdr = new XDomainRequest();
xdr.open("POST", "http://example.com/api/method");

xdr.onprogress = function(){
  //Handle Partial Response with xdr.responseText

xdr.onload = function(){ 
  //Handle Response with xdr.responseText 



Not part of any specification.

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
XDomainRequest No support No support 8.0
No support 9.0
No support No support
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
XDomainRequest No support No support ? No support No support

Document Tags and Contributors

 Contributors to this page: Sebastianz, teoli, Sheppy, AndrewMcGivery
 Last updated by: Sebastianz,