how can i trigger ajax error callback on success callback?

Question

I'm looking for a way to trigger ajax error in success callback. i have tried to explain my problem code below:

$.ajax({
url: requestURL,
data: postData,
type: 'post',
success: function(response){
    if(response.Success){
        // do something
    }else{
        // request workflow fails in this case,
        // i have to trigger this ajax request's error callback
    }
},
error: function(){
    // do something on error case
},
dataType: 'json'
});

Answer 1

var errorhandler = function(xhr, textStatus, error){
    // do something on error case
};

$.ajax({
   url: requestURL,
   data: postData,
   type: 'post',
   success: function(response){
       if(response.Success){
           // do something
       }else{
           errorhandler();
       }
   },
   error: errorhandler,
   dataType: 'json'
   });

Answer 2

You could send an appropriate HTTP status code so the error callback is triggered automatically.

The 4xx error range which pertains to client errors might be a good fit. Most API's make use of HTTP statuses to indicate error along with additional JSON/XML data as you're doing. See Twitter's response codes for an example.