How to know if ajax called file returns error?

Question

I am making an ajax call using jQuery. I am aware of the success\failure function of the ajax but how can i determine what happened?

Meaning that if i call an example.php file, if the file exists it will return sucess, right? Now how can i tell if the file did what it was suppoused to do?

Shyju · Accepted Answer · 2012-03-16T15:59:51.200

you should be returning an apt response from your server page which handles the ajax request. I will love to have one responsecode/status which says whats the status of the operation.

$.post("someurl.php",function(data){
  if(data=="success")
   {
      alert("Successfully Updated");
   }   
   else
   {
     alert("Some error in processing!");
   }
}

and from your php you return "success" if your operation is successful and return "error" if it is not successful.

EDIT : Here is how you do it with jquery ajax jQuery post is a shortform of jQuery ajax method with post Type

$.ajax({
  url: "youruel.php?querystring1=12&id=34", 
  success: function(data){
    if(data=="success")
       {
          alert("Successfully Updated");
       }   
       else
       {
         alert("Some error in processing!");
       }
  }
});

You may add the error event also to handle those too.

This sounds about right. but i'm using $.ajax not $.post, is it the same way to get the data? — eric.itzhak, Mar 16 '12 at 15:55

score 0 · Answer 2 · edited May 23 '17 at 11:56

0

I would try setting the error handling in your php file and returning the error messages described here:

jQuery Ajax error handling, show custom exception messages

Then you can just look at the xhr messages to see what the error is in jQuery.

edited May 23 '17 at 11:56

Community

1
1

answered Mar 16 '12 at 15:48

ktaylor

116
1
5

I don't need to debug it, i just need to know if the actions succeded in order to progress... – eric.itzhak Mar 16 '12 at 15:51

score 0 · Answer 3 · answered Mar 16 '12 at 15:51

I can tell you theoretically how I do it with c# handlers (which you can easily translate)

first the jquery success callback:

success: function (jsonResult, textSuccess) {
        if (jsonResult.Errored) {
          // ouch failed
          $("#helpErrorDiv").show();
        }
        else {
          // do something on success
        }
      }

and the server code, always returning json:

context.Response.ContentType = "application/json";

try    {
  // do something and return successfully a json object
}
catch (Exception ex)
{
  context.Response.Write((new {Errored = true}).ToJson());
}

How to know if ajax called file returns error?

3 Answers3