我已经使用其余的微服务成功实现了Http post请求。
使用帖子请求实现登录应用程序。
但我无法将验证设置为我的登录表单。如果输入的凭据不正确,表单应显示一条消息"用户名/密码无效。
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
import { HeaderComponent } from "./header.component";
import { LoginComponent } from './login/login.component';
import { HomeComponent } from './home/home.component';
import { GetService } from './home/get.service';
import { PostService } from './login/post.service';
import { routing } from "./app.routing";
import { RouterModule, Routes} from '@angular/router';
import { FormsModule ,ReactiveFormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';
@NgModule({
declarations: [AppComponent,HeaderComponent,LoginComponent,HomeComponent],
imports: [RouterModule,BrowserModule, HttpModule , routing, FormsModule ,ReactiveFormsModule ],
providers: [GetService,PostService],
bootstrap: [AppComponent]
})
export class AppModule { }
import { Component } from '@angular/core';
@Component({
selector: 'app-root',
templateUrl: './app.component.html'
})
export class AppComponent {
title = '';
}
<div style="text-align:justify-all;">
<h1>
{{title}}
</h1>
<div class="container">
<router-outlet></router-outlet>
</div>
import { Routes, RouterModule } from "@angular/router";
import { LoginComponent } from "./login/login.component";
import { HomeComponent } from "./home/home.component";
const APP_ROUTES: Routes = [
{ path: '' , redirectTo: '/homepage', pathMatch: 'full' },
{ path: 'homepage', component: LoginComponent },
{ path: 'homepage/home', component: HomeComponent }
];
export const routing = RouterModule.forRoot(APP_ROUTES);
import { Component, OnInit } from '@angular/core';
@Component({
selector: 'app-header',
templateUrl: './header.component.html',
})
export class HeaderComponent {}
<div class="row">
<div class="col-xs-12"><ul class="nav nav-pills">
<li routerLinkActive="active"><a [routerLink]="['/homepage/home']">
<strong>Home</strong></a></li>
<li><a [routerLink]="['/homepage']"><strong>Logout</strong></a></li>
</ul></div>
</div>
import { Component } from '@angular/core';
import { Router } from '@angular/router';
import { PostService } from './post.service';
@Component({
selector: 'app-login',
templateUrl: './login.component.html',
})
export class LoginComponent {
data:any;
constructor(private router:Router ,private MyService: PostService){ }
checkByCredential(username: string, password: string)
{
this.MyService.checkByCredential(username, password)
.subscribe(users => {
if(users)
this.router.navigate(['homepage/home']);
else
this.router.navigate(['homepage']);
} );
}}
<div class="container formWidth" style="text-align:center;">
<h1> eSpace Login</h1><hr>
<br/>
<h2>Login</h2>
<form role="form">
<div ng-control-group="credentials">
<label for="username">Username</label>
<input
type="text"
#username
id="username"
ng-control="username"
required>
<br/>
<label for="password">Password</label>
<input
type="password"
#password
id="password"
ng-control="password"
required>
</div>
<button type="button" (click)="checkByCredential(username.value,password.value)">Login</button>
</form>
</div>
import { Injectable } from '@angular/core';
import { Http } from '@angular/http';
import 'rxjs/add/operator/map';
@Injectable()
export class PostService {
constructor(private http:Http) { }
checkByCredential(username: string, password: string) {
const user = { username: username, password: password };
return this.http
.post('http://localhost:8080/checkByCredential', user)
.map(result => result.json());
} }
import { Component} from '@angular/core';
import { GetService } from './get.service';
@Component({
selector: 'app-home',
templateUrl: './home.component.html',
styleUrls: ['./home.component.css']
})
export class HomeComponent{
title :string;
data:any;
constructor(private MyService: GetService){
this.title="Angular Service";
}
onClickToLoadUsers(e: any): void {
this.loadUsers()
e.preventDefault()
}
loadUsers() {
this.MyService.GetUsers().subscribe(users => this.data = users);
}
}
<app-header></app-header>
<hr>
<p> <strong> Welcome to eSpace Home </strong></p>
<!-- <img src="/../../assets/i9.jpeg" class="img-rounded" alt="home"
height="400" width="1150">-->
<div style="margin-left:50px; height: 200px; overflow: auto;">
<h4>Angular GET service</h4><hr>
<button (click)="onClickToLoadUsers($event)">Load user</button><br/>
<br/>
<table>
<tr><td>Username</td>  <td>Password</td></tr>
<tr *ngFor= " let item of data">
<td>{{ item.username }}</td>  <td>{{ item.password }}
</td>
</tr>
</table>
</div>
import { Injectable } from '@angular/core';
import { Http } from '@angular/http';
import 'rxjs/add/operator/map';
@Injectable()
export class GetService {
constructor(private http:Http) { }
GetUsers(){
return this.http.get('http://localhost:8080/checkUsers')
.map(result => result.json());
}
}
当我使用不在我的数据库中的用户名和密码提交表单时,它应该显示一条消息&#34;用户名和密码无效&#34;。
任何人都可以帮助我在我的申请中实施被动表格。
答案 0 :(得分:2)
请检查以下代码并与您的代码进行比较,我在下面的代码中用**符号提及我,并在代码中进行更改。
import { Component } from '@angular/core';
import { Router } from '@angular/router';
import { PostService } from './post.service';
@Component({
selector: 'app-login',
templateUrl: './login.component.html',
})
export class LoginComponent {
data:any;
**IsLoggined:boolean = true;**
constructor(private router:Router ,private MyService: PostService){**this.IsLoggined = true;** }
checkByCredential(username: string, password: string)
{
this.MyService.checkByCredential(username, password)
.subscribe(users => {
if(users)
this.router.navigate(['homepage/home']);
else
**this.IsLoggined=false;
return false;**
} );
}}
login.component.html
<div class="container formWidth" style="text-align:center;">
<h1> eSpace Login</h1><hr>
<br/>
<h2>Login</h2>
<form role="form">
**<div [hidden]='IsLoggined' style="background-color:red;color:white"> invalid username and password </div>**
<div ng-control-group="credentials">
<label for="username">Username</label>
<input
type="text"
#username
id="username"
ng-control="username"
required>
<br/>
<label for="password">Password</label>
<input
type="password"
#password
id="password"
ng-control="password"
required>
</div>
<button type="button" (click)="checkByCredential(username.value,password.value)">Login</button>
</form>
</div>