// The .subscribe() method accepts 3 callbacks
.subscribe(
// The 1st callback handles the data emitted by the observable.
// In your case, it's the JSON data extracted from the response.
// That's where you'll find your total property.
(jsonData) => {
this.send_categories(jsonData.total);
},
// The 2nd callback handles errors.
(err) => console.error(err),
// The 3rd callback handles the "complete" event.
() => console.log("observable complete")
);
The .subscribe() method accepts 3 callbacks
Source: https://stackoverflow.com/questions/42238819/angular-2-how-to-call-a-function-after-get-a-response-from-subscribe-http-post
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