Display exception message from server on ajax error

Question

I use the following code in order to display exception message from server on client:

    [WebMethod]
    [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
    public static void test(String text)
    {
               try
               {
                    throw new Exception("Hello");
               }

               catch (Exception ex)
               {
                HttpContext.Current.Response.Write(ex.Message);
                throw new Exception(ex.Message, ex.InnerException);
               }

    }

client-side:

    $.ajax({
        url: 'DownloadFile.aspx/test',
        type: 'POST',
        contentType: 'application/json; charset=utf-8',
        // Pass the value as JSON string                 
        // You might need to include json2.js for the JSON.stringify
        //method: 'http://www.json.org/json2.js',
        async: false,
        dataType: "json",
        data: '{ "text": "' + text'"}',
        success: function(Result) {

        },

        error: function(xhr, textStatus, errorThrown) {
            var err = eval("(" + xhr.responseText + ")");
            alert(err.Message);
        }
    });

when I use localhost, I get "Hello" in the alert popup. when I use the same code on remote server, I get general system error.

How can I get the exception message text displayed to the user?

What do you mean by "general system error"? Is your jQuery error handler being called? — Heather
– Heather, Commented Nov 28, 2012 at 17:30
@Heather - Yes, jquery error handler is being called, but I get in responseText Message:"There was an error processing the request" — Inbal
– Inbal, Commented Nov 29, 2012 at 8:22

Igor Shakola · Accepted Answer · 2013-03-12 16:19:13Z

3

You need to set <customErrors mode="Off" /> in your web.config.

You can read more here

In general it looks like you have mode="RemoteOnly" which shows detailed exception messages only to the localhost.

answered Mar 12, 2013 at 16:19

Igor Shakola

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