jQuery AJAX call to web service producing empty response

Question

I'm using jQuery to make an AJAX call to a remote server, but with the code as it is (and ostensibly correct) I get an empty response. If I change the dataType to "script," I get the expected XML in the response, but I'm unable to do anything with it. Here's some pseudocode I'm working with:

function sendData(data)
{ 
 $.ajax(
 {
  type: "GET",
  url: "remote_server",
  dataType: "xml",
  data: "parameter=" + data,
  complete: function(xml)
  {
   console.info('XML result is',xml); 
  },
  contentType: "text/xml; charset=utf-8"
 });
}

A few additional things to note are that I'm using a local .htm file to call the remote server. When I use a Web browser (http://remote_server/page?parameter=value), I get a valid XML response. Finally, the XML response header has encoding type of ASCII, though I've also tried changing the charset value in my code to ASCII with the same result.

I appreciate any help you can provide.

tvanfosson · Accepted Answer · 2009-12-15 15:52:28Z

5

The problem you are running into is the same origin policy. You can't make an AJAX request, unless you use JSONP, to a URL in another domain. JSONP gets around this by loading up a script tag with your URL as the src and having the web server respond with a bit of code wrapped around the JSON result that executes a callback to your javascript method.

answered Dec 15, 2009 at 15:52

tvanfosson

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Fermin · Accepted Answer · 2009-12-15 15:52:17Z

3

You can use the NET tab in firebug to see what call is being made and what the actual response is. This can help a LOT.

answered Dec 15, 2009 at 15:52

Fermin

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Comments

David Hedlund · Accepted Answer · 2009-12-15 15:54:15Z

0

You can't make an AJAX request to a remote domain. What you can do, is create a script-include, but it requires that the response is being sent as a javascript function call:

callback('<xml/>');

instead of just

<xml/>

answered Dec 15, 2009 at 15:54

David Hedlund

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Thomas · Accepted Answer · 2009-12-15 15:55:22Z

0

Just a hunch, but check the mime-type of the data being returned via the ajax function. If you request xml, the script is expecting content encoded as text/xml or some other derivative.

You may also be running into the same origin policy, in which case you'll need to refactor everything to json and leverage jsonp.

answered Dec 15, 2009 at 15:55

Thomas

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