Angular2. How can I check if an observable is completed?

Question

In my page there is a button that generates a report. That report needs data that is loaded using a http call to a rest endpoint when the page is loaded, but I do not have a

Answer 1

One more solution:

Actually subscribe function takes three parameters:

onNext onError onCompleted

this._companyService.getCompanies().subscribe(
    (response) => { this.companiesModel = response; },
    (err) => { console.log(err) },
    (finally) => { console.log('finally') }
);