How to create an error that is captured in angular promise

Question

I am trying to understand how to get to the reject part of the .then() in angular.

C# Method

public int Foo(){
 int foo = 1;
 return foo;
}

I have tried throw HttpResponseException with 404 and 500, however even that response is caught and handled in the first part of the .then() promise. I just want to understand what sort of error needs to occur for it to go into the latter part.

I have used this as source to throw the response exception

Throw HttpResponseException or return Request.CreateErrorResponse?

Example angular method

foo.then(function(response){
  //success do something
}), function(error){
   // how to come here?
})

If I haven't explained well please do let me know, I am simply after getting to the reject part of the function.

Hey Harry, a 404 or 500 response is seen as a successful call. Because you asked and you received information. The error phase is triggered when the http call isn't successful. E.a. a timeout. You could test this by setting a very short timeout on the call, or just make a call to a wrong path or server. — therebelcoder
– therebelcoder, Commented Apr 18, 2016 at 13:38
I would do some research into how to handle exceptions in promises. Check out stackoverflow.com/q/36345046/215552 and stackoverflow.com/q/26534303/215552 — Heretic Monkey
– Heretic Monkey, Commented Apr 18, 2016 at 13:53
sure you had the right answer b4 yer man posted the example stackoverflow.com/questions/37286629/… thought you deserved an upvote! — Rachel Gallen
– Rachel Gallen, Commented May 17, 2016 at 21:47

Lex · Accepted Answer · 2016-04-18 13:58:14Z

0

Instead of returning int from your C# method, you should return IHttpActionResult.

[HttpGet]
public IHttpActionResult Foo()
{
    try 
    {
        int foo = 1;
        return Ok(foo);
    }
    catch(Exception exception)
    {
        // log exception or whatever you need to do
        return InternalServerError(exception);
    }
}

answered Apr 18, 2016 at 13:58

Lex

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2 Comments

Harry Over a year ago

Hi, thanks but wouldnt this still be caught in the success part of the .then()

Lex Over a year ago

The Ok() response will trigger your success callback, but the InternalServerError() response will trigger the error callback.

FvB · Accepted Answer · 2016-04-18 14:14:55Z

0

I think you messed up with one of your brackets. The error handler for a promise must be included INSIDE the ".then" method.

replace this:

foo.then(function(response){
  //success do something
}), function(error){
   // how to come here?
})

with

foo.then(function(response){
  //success do something
}, function(error){
   // how to come here?
});

Hope that helps.

answered Apr 18, 2016 at 14:14

FvB

7236 silver badges16 bronze badges

1 Comment

Harry Over a year ago

Hi, thanks but the code is for demo purpose and this does not answer my question.

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