Angular - Execute a function once the observable has finished

I am currently working with a 2 part process that involves importing a list of usernames in Component 1, submitting it to a service, and then using the returned user profile data in Component 2.

The issue I am facing is that when I receive the data back from the observable I am subscribed to, the desired action I intend to perform does not seem to be triggered.

Component 1:

import { Component, EventEmitter, NgModule, OnInit, Output } from '@angular/core';
import { FormControl, FormGroup, FormBuilder, Validators } from '@angular/forms';
import { MassEmpService } from "app/mass-change/shared/mass.service";
import { Observable } from 'rxjs/Observable';

// Other code for Component 1...

Component 2:

export class EmployeeSelectionComponent implements OnInit {

    // Define our search results
    public searchResults: ImportResults[] = [];

    constructor(
        private _massEmpService: MassEmpService
    ) {
    }

    // More code for Component 2...

Service:

import { Injectable } from '@angular/core';
import { Http, Response, Headers } from '@angular/http';
import { FrameworkService } from '@aps/framework';
import { Observable } from 'rxjs/Observable';
import { Subject } from 'rxjs/Subject';

@Injectable()
export class MassEmpService {

   // Relevant code for the MassEmpService...

The Question:

In Component 2, I am encountering an issue where I am unable to trigger the intended action upon receiving data back from the observable. It seems like I am not reaching the completion stage of the observable. Any insights on what could be causing this behavior?

Answer №1

One issue arises from the following code snippet:

this._massEmpService.importedResults
.subscribe(
    data => {
        this.searchResults.push(...data);
        console.log('I successfully reached this point');
    },
    () => {
        console.log('.. but not here');
    }
);

The second callback you are providing is intended for error handling, not to signify completion. To handle completion notifications, you must include an additional callback.

The other problem lies in the fact that importedResults is a Subject, which means it will not complete unless its complete method is explicitly called. It appears that the code snippets provided do not show any indication of calling this method.

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