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Detailed explanation of routing and its usage in Angular

青灯夜游
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2021-03-03 10:01:481817browse

This article takes you through routing in Angular and the use of Angular routing. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

Detailed explanation of routing and its usage in Angular

Related recommendations: "angular Tutorial"

1. Angular creates a project with routing by default

1. Command to create a project

ng new ng-demo --skip-install

Detailed explanation of routing and its usage in Angular

2. Create the required components

ng g component components/home
ng g component components/news
ng g component components/newscontent

3. Find app-routing.module.ts and configure routing

Introduce components

import { HomeComponent } from './components/home/home.component';
import { NewsComponent } from './components/news/news.component';
import { ProductComponent } from './components/product/product.component';

Configure routing

const routes: Routes = [
{path: 'home', component: HomeComponent},
{path: 'news', component: NewsComponent},
{path:'product', component:ProductComponent },
{path: '*', redirectTo: '/home', pathMatch: 'full' }
];

4. Find app.component .html root component template, configure router-outlet to display dynamically loaded routes

<h1>
    <a>首页</a>
    <a>新闻</a>
</h1>
<router-outlet></router-outlet>

2. Angular routerLink jump page default route

<a>首页</a>
<a>新闻</a>
//匹配不到路由的时候加载的组件 或者跳转的路由
{
    path: '**', /*任意的路由*/
    // component:HomeComponent
    redirectTo:'home'
}

3. Angular routerLinkActive Set routerLink and select the route by default

<h1>
  <a>
    首页
  </a>
  <a>
    新闻
  </a>
</h1>
<h1>
    <a>首页</a>
    <a>新闻</a>
</h1>

4. Dynamic routing

4.1. Question mark parameter passing

jump Transfer method, page jump or js jump
The url address of the question mark parameter is displayed as.../list-item?id=1

queryParams attribute is fixed


{{ item.name }}

//js jump
//router is an instance of ActivatedRoute

import { Router } from '@angular/router';
.
constructor(private router: Router) {}
.
this.router.navigate(['/newscontent'],{
  queryParams:{
    name:'laney',
    id:id
  },
  skipLocationChange: true 
  //可以不写,默认为false,设为true时路由跳转浏览器中的url会保持不变,传入的参数依然有效
});

How to get parameters

import { ActivatedRoute } from '@angular/router';

constructor(public route:ActivatedRoute) { }
ngOnInit() { 
    this.route.queryParams.subscribe((data)=>{
      console.log(data);
 })
}

4.2 Path parameter passing

Path The URL address of the parameters is displayed as.../list-item/1

<a [routerLink]="[’/list-item’, item.id]"> {{ item.name }}
//js跳转 //router为ActivatedRoute的实例
this.router.navigate([’/list-item’, item.id]);

Path configuration:

{path: ‘list-item/:id’, component: ListItemComponent}

How to obtain parameters

this.route.params.subscribe(
  param => {
      this.id= param['id'];
  }
)

5. Father and son Routing

1. Create component and introduce component

import { WelcomeComponent } from ‘./components/home/welcome/welcome.component’;
 import { SettingComponent } from ‘./components/home/setting/setting.component’;

2. Configure routing

{
    path:'home',
    component:HomeComponent,
    children:[{
      path:'welcome',
      component:WelcomeComponent
    },{
      path:'setting',
      component:SettingComponent
    },
    {path: '**', redirectTo: 'welcome'}
  ]
},

3. Define router-outlet in parent component

Update For more programming related knowledge, please visit: programming video! !

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