first time include all file

UI/angularUI/src/app/login/login.component.ts

@@ -0,0 +1,81 @@
+import { Component, OnInit } from '@angular/core';
+import { Router, ActivatedRoute } from '@angular/router';
+import { FormBuilder, FormGroup, Validators } from '@angular/forms';
+import { first } from 'rxjs/operators';
+
+import { AuthenticationService } from '../user-services';
+
+@Component({
+  templateUrl: './login.component.html',
+  styleUrls: ['./login.component.css'],
+  selector: 'login'
+})
+export class LoginComponent implements OnInit {
+  loginForm: FormGroup;
+  
+   
+  loading = false;
+  submitted = false;
+  returnUrl ="";
+  // get return url from route parameters or default to '/'
+ 
+  error = '';
+
+  constructor(
+    private formBuilder: FormBuilder,
+    private route: ActivatedRoute,
+    private router: Router,
+    private authenticationService: AuthenticationService) { 
+     
+      this.loginForm = this.formBuilder.group({
+        username: ['', Validators.required],
+        password: ['', Validators.required]
+      });
+    }
+
+  ngOnInit() {
+    this.returnUrl = this.route.snapshot.queryParams['returnUrl'] || '/home/concessionvalidation';
+    // reset login status
+    this.authenticationService.logout();
+   
+    
+  }
+
+  // convenience getter for easy access to form fields
+  get f() { return this.loginForm.value; }
+
+  onSubmit() {
+    this.submitted = true;
+
+    // stop here if form is invalid
+    if (this.loginForm.invalid) {
+      return;
+    }
+   
+    const user = this.loginForm.value.username;
+    const pass = this.loginForm.value.password;
+    console.log("the form", this.loginForm, user,pass);
+    this.loading = true;
+    this.authenticationService.login(user,pass)
+      .pipe(first())
+      .subscribe({
+          next:  data => {
+          this.loading = false;
+          console.log("login result ", data);
+          if (data == 1)
+            this.router.navigate([this.returnUrl]);
+          else
+          {
+            this.loginForm.patchValue({password: ''});
+            alert("Invalid Username or Password. Please try again.");
+            
+          }
+        },
+       error: er => {
+          console.log("error in login", er);
+          this.error = er.message;
+          this.loading = false;
+        }
+    });
+  }
+}