JQuery ajax cross domain call and permission issue

I have this polling script to check if a text file is created on the server. Works great locally, but fails when the file is on a different domain. How would i rewrite this for cross domain support?

$.ajax({ 
    url: 'http://blah.mydomain.com/test.txt', 
    type: "GET", 
    success: function(result) { 
        //Success!
        window.location.replace(Successful.aspx');
    }, 
    error: function(request, status, error) { 
        setTimeout("VerifyStatus(" + pollingInterval + ")");
    }
    });

EDIT: 开发者_C百科I ended up using YQL to solve the cross domain issue and although it works, YQL is really slow that's adding quite a bit of performance overhead. Can anyone suggest a better solution for cross domain JQuery calls?

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Set the dataType to "JSONP" on your $.ajax() call. You'll have to make sure the response is properly formatted for it to work. Wikipedia has a good section on JSONP.

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Ajax doesn't go cross domain. Your best bet is to create a php page on the local domain that does the check, and go to -that- with your ajax call.

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To get cross-domain AJAX via jQuery, you might want to check this out: http://github.com/jamespadolsey/jQuery-Plugins/tree/master/cross-domain-ajax/

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Almost modern browsers are now supporting cross domain with CORS protocol, so you can use Ajax jQuery to do your job without editing anything in your script code. The change is into your server, you need to enable your server with CORS. It's just the job with adding header fields in each responses to client to support CORS protocol. See an implementation example here.

http://zhentao-li.blogspot.com/2013/06/example-for-enabling-cors-support-in.html