How to return custom exception message to Ajax call?

Question

I want to return a specific message on error of an ajax request.

[WebMethod]
public static AjaxReturnObject SubmitWager(string token, string track, string race, string amount, string pool, string runners)
{
    try
    {
        var serviceReturn = Services.Account.SubmitWager("", track, race, pool, amount, runners);
        return new AjaxReturnObject(serviceReturn.AccountToken, serviceReturn.Payload);
    }
    catch (CustomServiceException<string> e)
    {
        throw new Exception(e.Message);
    }
}

Debugging says that it hits my catch when I need it to, but when I look at the xhr within my jquery ajax call it ALWAYS says "There was an error processing the request."

error: function (xhr, textStatus, errorThrown) {
            log(xhr, textStatus, errorThrown);
}

How can I get my desired message to comeback to the ajax call under xhr.responseText?

Pawan · Accepted Answer · 2012-06-21 08:16:13Z

4

Try just Throw instead of Throw new in the catch block. and once u parse the XHR.responseText, the exception message will be contained in "Message" For ex:

$.ajax({
       type: "POST",
       //... other parameters
       error: function(XHR, errStatus, errorThrown) {
             var err = JSON.parse(XHR.responseText);
             errorMessage = err.Message;
       }
});

answered Jun 21, 2012 at 8:16

Pawan

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Comments

Brenton · Accepted Answer · 2012-06-20 21:57:40Z

1

Perhaps the better route would be is to define the success callback of the AJAX request with code that checks a success flag:

c#

[WebMethod]
public static AjaxReturnObject SubmitWager(string token, string track, string race,   string amount, string pool, string runners)
{
try
{
    var serviceReturn = Services.Account.SubmitWager("", track, race, pool, amount, runners);
    return new AjaxReturnObject(serviceReturn.AccountToken, serviceReturn.Payload);
}
catch (CustomServiceException<string> e)
{
    return new AjaxReturnObject(0, e.Message();
}
}

Javascript

$.ajax({
  ...
  success: function (data) {
    if (data.AccountToken == 0) {
      // There was an error 
      log(data.Payload);
    }
    else {
      // your code
    }
  }
});

I offer this alternative because I'm not sure that if you throw an error in the server side code, that the function returns anything back. That error you're receiving, is client side, the error callback really refers to whether or not the request could be made.

answered Jun 20, 2012 at 21:57

Brenton

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3 Comments

Zholen Over a year ago

I'm not a huge fan of doing that. I feel it defeats some of the purpose of even having an 'error' handler for the ajax call, but it may be my only option.

Brenton Over a year ago

I feel like the bigger point of the error callback on the ajax call are for things like connectivity problems, if the web service is unavailable, or in cases like this internal service error. But, I'd say the problem is that it doesn't receive data back other than "it didn't work"

Zholen Over a year ago

It bothers me that in most cases for my purposes, whether its connectivity issues or invalid data issues, the response is generally the same for all those situations. Which leaves me to write code like: success: function (data) { if (data.AccountToken == 0) { doError(); } else { // your code } }, error: doError } function doError(){......}

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