Angular 5 - 无法从一个组件导航到另一个组件

Posted 2023-02-23

【中文标题】Angular 5 - 无法从一个组件导航到另一个组件

【英文标题】：Angular 5 - Unable to navigate from one component to another component

【发布时间】：2018-07-21 16:58:49

【问题描述】：

我正在开发 Angular 应用程序。在那我有两个页面登录和主页。登录提交按钮后，它应该导航到主页。为此，我尝试了多种方法，但它没有导航到主页。最后我在我的登录（app.component.html）文件中使用了<router-outlet></router-outlet>。所以主页显示在登录页面中。我想在登录后导航主页。以下是我当前的输出和代码

当我刷新 http://localhost:4200/home 时，它显示如下错误

app.component.html（登录页面）

<div align="center">
    <form (ngSubmit)="onLoginSubmit()" class="fullForm">

        <div class="imgcontainer"></div>
        <h2>PL Auth</h2>
        <div class="container">
            <form (ngSubmit)="generateOtpSubmit()" class="generateOtpForm">
                <label> <b>Username: </b>
                </label> <input type="text" placeholder="Enter Username" id="username"
                    [(ngModel)]=userName name="uname" required> <br> <br>
                <label> <b>Password : </b>
                </label> <input type="password" placeholder="Enter Password" id="password"
                    [(ngModel)]=password name="psw" required> <br> <br>
                <button type="submit" class="otpButton">Generate OTP</button>
            </form>
            <br> <br> <label> <b>Enter OTP : </b>
            </label> <input type="text" placeholder="Enter OTP" id="otp" [(ngModel)]=otp
                name="otp" required> <br> <br>
            <button type="submit" class="loginButton">Login</button>

        </div>
        <div>
            <p style="color: red;"> loginStatus </p>
        </div>
    </form>
    <router-outlet></router-outlet>
</div>

app.component.ts

import  Component, OnInit  from '@angular/core';
import  Location  from '@angular/common';
import  HomepageComponent  from './homepage/homepage.component';
import  Headers, Http, Response  from '@angular/http';
import   RouterModule, Routes    from '@angular/router';
import  HttpClient  from '@angular/common/http';
import  Directive  from '@angular/core';
//import  Router  from '@angular/router'; 
import  Router  from "@angular/router";
import  Text  from '@angular/compiler';


export const appRoutes: Routes = [
   path: 'home', component:HomepageComponent
];

@Component(
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
)

export class AppComponent implements OnInit 

  otpsubmitted = false;
  loginSubmitted = false;
  userName = '';
  password = '';
  otp ='';
  userAuthCheck:Text;
  checkOtp:Text;
  authCheck ='';
  loginStatus='';

  ngOnInit() 
  

  constructor(private http: Http,private httpClient: HttpClient,private route: Router )  

  private generateOtp()
    this.http.post('http://localhost:8080/loginController/generateotp', 
      userMail: this.userName
    )
      .subscribe(
        res => 
          console.log(res);
        ,
        err => 
          console.log("Error occured");
        
      );
  

  private logSubmit()
    this.http.post('http://localhost:8080/loginController/authUser', 
      userMail: this.userName,
      password: this.password,
      otp: this.otp
    )
      .subscribe(
        res => 
          const printResp=res.json();
          console.log(res);
          //this.loginStatus=printResp.status;

          if (printResp.status === 'true')
            this.loginStatus =  '';
            console.log('in the clickName');
            this.route.navigateByUrl('/home');
            //this.route.navigate(['home/']);
           else if(printResp.status === 'false') 
                this.loginStatus =  printResp.Data.errorMessage;                          
          
           ,
        err => 
          console.log("Error occured"+err);
        
      );
  


  generateOtpSubmit() 
    this.otpsubmitted = true;
    this.generateOtp();
  

  onLoginSubmit()
    this.loginSubmitted = true;
    this.logSubmit();
  

app-routing.module.ts

import ApplicationComponent from './application/application.component';
import NavigationComponent from './navigation/navigation.component';
import  HomepageComponent  from './homepage/homepage.component';
import AppComponent from './app.component';
import NgModule from '@angular/core';
import RouterModule, Routes from '@angular/router';
import  CommonModule  from '@angular/common';


const routes: Routes = [
  path: 'home', component: HomepageComponent,
  path: 'application', component: ApplicationComponent,
  path: 'navigation', component: NavigationComponent,
];

@NgModule(
  imports: [CommonModule,RouterModule.forRoot(routes)],
  exports: [RouterModule],
  declarations: []
)

export class AppRoutingModule 

app.module.ts

import  BrowserModule  from '@angular/platform-browser';
import  AppRoutingModule  from './app-routing.module';
import  Router  from '@angular/router';
import  NgModule  from '@angular/core';
import  FormsModule  from '@angular/forms';
import  AppComponent  from './app.component';
import  HttpModule  from '@angular/http';
import  HttpClientModule  from '@angular/common/http';
import  HomepageComponent  from './homepage/homepage.component';
import  ApplicationComponent  from './application/application.component';
import  NavigationComponent  from './navigation/navigation.component';
import  SearchuserComponent  from './searchuser/searchuser.component';

@NgModule(
  declarations: [
    AppComponent,
    HomepageComponent,
    ApplicationComponent,
    NavigationComponent,
    SearchuserComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpClientModule,
    HttpModule,
    AppRoutingModule 
  ],
  bootstrap: [AppComponent]
)
export class AppModule  

homepage.component.html

<p>
  homepage works!
</p>

index.html

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>CyberSecurityVw</title>
  <base href="/">

  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="icon" type="image/x-icon" href="favicon.ico">
</head>
<body>
  <app-root></app-root>
</body>
</html>

homepage.component.ts

import  Component, OnInit  from '@angular/core';

@Component(
  selector: 'app-homepage',
  templateUrl: './homepage.component.html',
  styleUrls: ['./homepage.component.css']
)
export class HomepageComponent implements OnInit 

  constructor()  

  ngOnInit() 
  

【问题讨论】：

您在下面的其中一个 cmets 中提到了服务器请求的 404 错误。你投资了吗？这是针对哪个请求？

【参考方案1】：

随便用

this.route.navigate(['/home']);

【讨论】：

加载资源失败：服务器响应状态为404（未找到）

你能发布 home.component.ts 文件吗

发布 home.comonent.ts

文件夹中有模板吗

是的，我有那个模板在问题中我错误地将其命名为 home.component.html。我会编辑

【参考方案2】：

首先：您需要将登录表单移动到一个名为 (login) 的新组件

第二个：你的应用组件 html 应该只包含这一行

 <router-outlet></router-outlet> 

因为应用程序组件的作用类似于您的登录页面，因此您不应在其上添加登录表单

第三：你需要修改你的路由

import  HomepageComponent  from './homepage/homepage.component';
import  LoginComponent  from './login/login.component';
import  AppComponent  from './app.component';
import  NgModule  from '@angular/core';
import  RouterModule, Routes  from '@angular/router';
import  CommonModule  from '@angular/common';


const routes: Routes = [
     path: '', redirectTo: 'home', pathMatch: 'full' ,
    
        path: 'home', component: HomepageComponent,
        children: [
             path: '', redirectTo: '/example', pathMatch: 'full' ,
            
                path: 'example', component: ExampleComponent
            
        ]
    ,

     path: 'login', component: LoginComponent ,
];

@NgModule(
    imports: [CommonModule, RouterModule.forRoot(routes)],
    exports: [RouterModule],
    declarations: []
)

export class AppRoutingModule  

-当您在没有任何路由的情况下键入您的网站 url 时会发生什么，它将导航到 home/example - 所以 home 组件应该包含您的网站设计模板，因此所有子组件都将注入到 home 组件中并采用相同的模板设计

-登录组件是独立的，因为你不需要它来获取相同的网站设计模板

第四：在你的主页html中添加这个

<div>
   //your header 
     <header></header>
      <div class="content">
         <router-outlet></router-outlet>
     </div>
    // your footer
    <footer></footer>

  </div>
</div>

【参考方案3】：

首先在你的主组件中添加导入

import Router  from '@angular/router';

在同一文件中为构造函数和方法添加以下代码

constructor(private route: Router) 
public Dashbord()

  this.route.navigate(['/dashboard']);

在app-routing.module.ts文件中添加dashboard

const routes: Routes =
[
   path: '', pathMatch: 'full' ,component: TestComponent,
   path: 'dashboard', component: DashboardComponent  
];

这是您的.html 文件代码

<button mat-button (click)="Dashbord()">Dashboard</button><br>

祝你好运。