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POjQuery ajax callback receiving incorrect json result
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  1. POjQuery ajax callback receiving incorrect json result
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    copied!<p>In my asp.net mvc 4 web app my action in the controller seems to return a invalid data to the jquery ajax callback... The action is doing a ping to an IP and it is called several times from several ajax calls in order to do pings to several IPs.</p> <p>A piece of my action in the controller (below what is returned):</p> <pre><code> Response.ContentType = "application/json;charset=utf-8"; Response.StatusCode = (int)(packetsLost &lt; 4 ? HttpStatusCode.OK : HttpStatusCode.NotFound); Response.TrySkipIisCustomErrors = true; return new JsonResult() { ContentType = "application/json;charset=utf-8", Data = new { sent = 4, received = 4 - packetsLost, lost = packetsLost, percentLost = (int) (packetsLost / 4 * 100), responseStatus01 = statuses[0], responseStatus02 = statuses[1], responseStatus03 = statuses[2], responseStatus04 = statuses[3], responseMessage01 = responseStatuses[0], responseMessage02 = responseStatuses[1], responseMessage03 = responseStatuses[2], responseMessage04 = responseStatuses[3], rtt01 = rtt[0], rtt02 = rtt[1], rtt03 = rtt[2], rtt04 = rtt[3], ttl01 = ttl[0], ttl02 = ttl[1], ttl03 = ttl[2], ttl04 = ttl[3], minRtt = roundTripTimes.Count == 0 ? "0" : string.Format("{0}ms", roundTripTimes.Min()), maxRtt = roundTripTimes.Count == 0 ? "0" : string.Format("{0}ms", roundTripTimes.Max()), avgRtt = roundTripTimes.Count == 0 ? "0" : string.Format("{0}ms", roundTripTimes.Average()) }, JsonRequestBehavior = JsonRequestBehavior.AllowGet }; </code></pre> <p>and jquery ajax call:</p> <pre><code>ajax({ url: '/Controller/Action/', type: 'POST' }).then(function (data) { var _data; try { _data = $.parseJSON(data); } catch (err) { alert("Something went bad!!!"); } }, function (data) { var _data; try { _var = $.parseJSON(data.responseText); } catch (err) { alert("Something went bad!!!"); } }); </code></pre> <p>1) When action returns http status code OK (200) data.responseText in the jquery ajax callback is empty so I convert data instead (that contains correct data) but for some reason it is crashing when converting using parseJSON(data): error catched says invalid character... I do not know why...</p> <p>2) When action return http status code NotFound (404) data.responseText sometimes (not always) is empty and statusText within data is "error" so neither I do not understand it....</p> <p>Action in the controller always is returning the correct data....</p> <p>Could someone help me to detect this error? or right me in the right direction....</p> <p><strong>UPDATED:</strong> From ie dev tools, in network, I have observed that some pings are cancelled and then when trying to process them it returns empty responseText to the ajax callback so when trying to parse it, it crashes. I have observed that If I set the timeout for ping to a lower value, for example, 750ms, it is working but if i use the default timeout for ping, that is, 5sec, then it does not work: some pings are cancelled and when trying to serve them they are returning empty responseText that cause it to crash when trying to parse in ajax callback.</p>
 

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