added login functionality to LoginComponent

src/app/account/login/login.component.ts

@@ -1,7 +1,8 @@
 import { Component, OnInit } from '@angular/core';
 import { FormControl, FormGroup } from '@angular/forms';
 import { AccountService } from '../account.service';
-import {ActivatedRoute, Router} from '@angular/router';
+import { ActivatedRoute, Router } from '@angular/router';
+import { first } from 'rxjs/operators';
 
 @Component({
   selector: 'app-login',
@@ -18,11 +19,16 @@ export class LoginComponent implements OnInit {
 
   onLogin() {
     this.loading = true;
-    if (this.form.invalid) {
-      return;
-    }
-    console.log(this.form.value);
-
+    this.accountService.login(this.form.controls['username'], this.form.controls['password'])
+      .pipe(first())
+      .subscribe(data => {
+        this.router.navigate([this.returnUrl]);
+      },
+      error => {
+        // TODO error handling
+        console.log(error);
+        this.loading = false;
+      });
   }
 
   constructor(private accountService: AccountService,