ASP.NET MVC 5 Web API + jQuery AJAX – Exception Handling

ASP.NET MVC 5 Web API + jQuery AJAX – Exception Handling

 
   ASP.NET MVC 5 Web API – Restful
 
   public class GraphController : ApiController
   {
     … …
 
     public JObject Post(JObject obj)
     {
       … …
 
       if (type != null && typeid != null)
         … …
       else
         throw new Exception("Node Type / Node ID is invalid.");
     }
   }
 
   If there is no Specific Definition from Web API Controller,
   the Response Code is 200 for Normal Status & the Response Code is 500 for Exception Case.
   The Response Code can be captured from Browser Development Tools – Network Tab during AJAX HttpRequest.
   jQuery AJAX function can also be captured the Response Code to perform different Condition Development.
 
 
   JavaScript – jQuery AJAX ( may be fired from OnLoad Event & OnClick Event. )
 
   $("#exception").hide();
   $("#networkblock").html("");
 
   $.ajax({
     url: "/api/Graph",
     data: { type: "Person", typeid: 2 },   /*  Either One of Property is null. The Exception would be thrown from Restful Server Side.  */
     type: "POST",
     success: function (data) {
       … …
     },
     error: function (e) {
       $("#exception").show();
       $("#exception").html(JSON.parse(e.responseText).Message + " – " + JSON.parse(e.responseText).ExceptionMessage);
     }
   });