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copied!<p><s>why you have <code>'?callback=?'</code> at the end of url ? is it <code>jsonp</code>? yes then change the <code>dataType:'jsonp'</code></p> <p>Edit</p> <p>make a error handler </p> <pre><code>$.ajax({ url: 'localhost:39657/List/' + $(this).val(), dataType: "json", success: function(json) { alert("success"); }, error:function(xhr){ console.log(xhr.responseText); } }); </code></pre> <p>see if it hits the success handler or the error handler and what error message does it give? i dont think there is something wrong with the json parsing as it is valid json and being parsed fine <a href="http://jsfiddle.net/3NCZR/" rel="nofollow"><em>look here</em></a> </s></p> <hr> <p>as infered from the comments you are running into the <a href="http://en.wikipedia.org/wiki/Cross-Origin_Resource_Sharing" rel="nofollow"><strong>CORS</strong></a> blues, which is implemented as a security feature to prevent cross site scripting attacks you cannot use <code>jsonp</code> by just setting the dataType to jsonp on the client side, the server side has to be configured as well, if its a web-service you can set the response header to allow the cross domain resource sharing by </p> <pre><code>var resp = new HttpResponseMessage(); resp.Headers.Add("Access-Control-Allow-Origin","*"); </code></pre> <p>alternatively you can make a server side <em>proxy</em> and have that proxy call your other project whether its a webservice or web application and then return the received response to the client side </p>

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