Marcos Kubis Marcos Kubis - 6 months ago 37
Javascript Question

Complete callback in Observable.prototype.subscribe in Angular 2

The complete callback does not work as expected. Let me explain:

See this picture, note the

complete
callback in
subscribe
method.
This
complete
function is only called when the
observerOrNext
is called. When some error happens, the
complete
is not called. This is right? There are another method to get a callback that always is called when the process finish?

enter image description here

Example:

When success:

this.getData(params)
.subscribe(
successData => {
// this is called
},
error => {
// this is not called. Ok!
},
() => { // when complete
// this is called, ok!
}
);


When error:

this.getData(params)
.subscribe(
successData => {
// this is not called, ok!
},
error => {
// this is called. Ok! Yeah!
},
() => { // when complete
// this is not called, why god??
}
);

Answer

I think what you are looking for is the .finally function.

Invokes a specified action after the source observable sequence terminates gracefully or exceptionally. There is an alias called finallyAction for browsers < IE9

Here's an example below: https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/core/operators/finally.md