因為會忘,所以要寫下來

Angular Router 筆記

3 minutes to read

在 app.module.ts 引入 RouterModule

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

@NgModule({
  RouterModule.forRoot(routes)
})

router 設定

ps.注意:路徑不包含斜線

const routes: Routes = [
  {
    path: 'home',
    component: HomeComponent,
  },
  {
    path: 'blog',
    loadChildren: () => import('./blog/blog.module').then((m) => m.BlogModule),
  },
  { path: '404', component: NotFoundComponent },
  { path: '**', component: NotFoundComponent },
];

Route Guards 路由守衛

class AlwaysAuthGuard implements CanActivate {
  canActivate() {
    return true;
  }
}
const routes: Routes = [
  { path: 'home', component: HomeComponent },
  {
    path: 'blog/:id',
    component: BlogComponent,
    canActivate: [AlwaysAuthGuard],
  },
  { path: '**', component: PageNotFoundComponent },
];

預設導址

{
    path: '**',
    redirectTo: 'list',
},

網址傳參數

path

網址 http://localhost:4200/list/網址變數

routing.module

{
    path: 'blog',
    data: { //這一層要給它的資料
      breadcrumb: 'NAV.blog',
    },
    loadChildren: () => import('./blog/blog.module').then((m) => m.BlogModule)
    canActivateChild: [AlwaysAuthGuard],  //路由守衛
},
{
    path: 'blog/:slug',  //有加「:」就是變數
    component: BlogComponent,
},

ts 設定網址連結 (path)

constructor(private router: Router) { }

this.router.navigate(['blog/', 'taiwan']);

html template 設定網址連結

<a [routerLink]="['blog', 'taiwan']" routerLinkActive="active">Prodcuts</a>

routerLinkActive="active" 若是在當下這頁面 會新增一個 ‘active’ 的 class

ts 取得網址參數方式

constructor(private activatedRoute: ActivatedRoute) { }

this.activatedRoute.paramMap.subscribe((params: Params)=> {
    //params: { slug: 'taiwan' }
    console.log( params.get('slug') )  // 'taiwan'
})

queryParam

網址 http://localhost:4200/list?參數名=變數

routing.module 不變

{
  path: 'list',
  component: ListComponent,
},

ts:

constructor(private router: Router) { }

this.router.navigate(['list/'], { queryParams: { page: pageNumber, test: '字串也可' } });

template

<a [routerLink]="['list']" [queryParams]="{ page: pageNumber }">Products</a>

取得參數方式

constructor(private activatedRoute: ActivatedRoute) { }

this.activatedRoute.queryParamMap.subscribe( (params: ParamMap) => {
    //params: { page: '1' }
    console.log( params.get('page') )  // '1'
})

activatedRoute 裡的 queryParamMap 跟 paramMap 都是可觀察物件 接下來就是需要理解 rxjs 後 才能活用了


FAQ

Q: 使用 routerLinkActive 時,根路徑一直被觸發

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