Question

I encountered some behaviour I simply don't understand.

Given the following setup:

I created a fresh Ionic 4 app with 'tabs' starter ('ionic start tabs')
I added a page 'login' ('ionic g page login')
I added a routerLink - button to log in, leading to tabs

Now, what happens: If 'tabs' is the default page when loading the page

({ path: '', loadChildren: './tabs/tabs.module#TabsPageModule' },)

and I change url to login 'localhost:8100/login' and press the button, 'tabs'-page gets loaded. If on the other hand 'login' it the default page ({ path: '', loadChildren: './login/login.module#LoginPageModule' },) and I press the button, I get an error:

ERROR Error: Uncaught (in promise): Error: Cannot match any routes. URL Segment: 'tabs/tab1'
Error: Cannot match any routes. URL Segment: 'tabs/tab1'
    at ApplyRedirects.push../node_modules/@angular/router/fesm5/router.js.ApplyRedirects.noMatchError (router.js:2469)
    at CatchSubscriber.selector (router.js:2450)
    at CatchSubscriber.push../node_modules/rxjs/_esm5/internal/operators/catchError.js.CatchSubscriber.error (catchError.js:34)
    at MapSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._error (Subscriber.js:79)
    at MapSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.error (Subscriber.js:59)
    at MapSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._error (Subscriber.js:79)
    at MapSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.error (Subscriber.js:59)
    at MapSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._error (Subscriber.js:79)
    at MapSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.error (Subscriber.js:59)
    at ThrowIfEmptySubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._error (Subscriber.js:79)
    at resolvePromise (zone.js:831)
    at resolvePromise (zone.js:788)
    at zone.js:892
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:423)
    at Object.onInvokeTask (core.js:17290)
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:422)
    at Zone.push../node_modules/zone.js/dist/zone.js.Zone.runTask (zone.js:195)
    at drainMicroTaskQueue (zone.js:601)
    at ZoneTask.push../node_modules/zone.js/dist/zone.js.ZoneTask.invokeTask [as invoke] (zone.js:502)
    at invokeTask (zone.js:1744)
defaultErrorLogger @ core.js:15724
push../node_modules/@angular/core/fesm5/core.js.ErrorHandler.handleError @ core.js:15772
next @ core.js:17771
schedulerFn @ core.js:13515
push../node_modules/rxjs/_esm5/internal/Subscriber.js.SafeSubscriber.__tryOrUnsub @ Subscriber.js:192
push../node_modules/rxjs/_esm5/internal/Subscriber.js.SafeSubscriber.next @ Subscriber.js:130
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._next @ Subscriber.js:76
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.next @ Subscriber.js:53
push../node_modules/rxjs/_esm5/internal/Subject.js.Subject.next @ Subject.js:47
push../node_modules/@angular/core/fesm5/core.js.EventEmitter.emit @ core.js:13499
(anonymous) @ core.js:17321
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke @ zone.js:391
push../node_modules/zone.js/dist/zone.js.Zone.run @ zone.js:150
push../node_modules/@angular/core/fesm5/core.js.NgZone.runOutsideAngular @ core.js:17258
onHandleError @ core.js:17321
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.handleError @ zone.js:395
push../node_modules/zone.js/dist/zone.js.Zone.runGuarded @ zone.js:164
_loop_1 @ zone.js:694
api.microtaskDrainDone @ zone.js:703
drainMicroTaskQueue @ zone.js:608
push../node_modules/zone.js/dist/zone.js.ZoneTask.invokeTask @ zone.js:502
invokeTask @ zone.js:1744
globalZoneAwareCallback @ zone.js:1781

Why is that so? And what is the proper way to move in and out of tab-pages?

app-routing.module.ts

import { NgModule } from '@angular/core';
import { PreloadAllModules, RouterModule, Routes } from '@angular/router';

const routes: Routes = [
  //{ path: '', loadChildren: './tabs/tabs.module#TabsPageModule' },
  { path: '', loadChildren: './login/login.module#LoginPageModule' },
  { path: 'login', loadChildren: './login/login.module#LoginPageModule' }
];
@NgModule({
  imports: [
    RouterModule.forRoot(routes, { preloadingStrategy: PreloadAllModules })
  ],
  exports: [RouterModule]
})
export class AppRoutingModule {}

login.page.html

<ion-header>
  <ion-toolbar>
    <ion-title>login</ion-title>
  </ion-toolbar>
</ion-header>

<ion-content>

  <ion-button expand="block" routerLink="/tabs/tab1" routerDirection="forward">Tabs</ion-button>

</ion-content>

tabs.router.module.ts (unaltered)

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { TabsPage } from './tabs.page';

const routes: Routes = [
  {
    path: 'tabs',
    component: TabsPage,
    children: [
      {
        path: 'tab1',
        children: [
          {
            path: '',
            loadChildren: '../tab1/tab1.module#Tab1PageModule'
          }
        ]
      },
      {
        path: 'tab2',
        children: [
          {
            path: '',
            loadChildren: '../tab2/tab2.module#Tab2PageModule'
          }
        ]
      },
      {
        path: 'tab3',
        children: [
          {
            path: '',
            loadChildren: '../tab3/tab3.module#Tab3PageModule'
          }
        ]
      },
      {
        path: '',
        redirectTo: '/tabs/tab1',
        pathMatch: 'full'
      }
    ]
  },
  {
    path: '',
    redirectTo: '/tabs/tab1',
    pathMatch: 'full'
  }
];

@NgModule({
  imports: [
    RouterModule.forChild(routes)
  ],
  exports: [RouterModule]
})
export class TabsPageRoutingModule {}

EDIT

I've found a fix, for anyone with the same problem. Still, don't really understand. If anyone can elaborate (and even more if my fix is not a good practice) - please, explain.

New app-routing.module.ts

import { NgModule } from '@angular/core';
import { PreloadAllModules, RouterModule, Routes } from '@angular/router';
import {TabsPage} from "./tabs/tabs.page";

const routes: Routes = [
  //{ path: '', loadChildren: './tabs/tabs.module#TabsPageModule' },
  {path: '', loadChildren: './login/login.module#LoginPageModule'},
  {path: 'login', loadChildren: './login/login.module#LoginPageModule'},
  {
    path: 'tabs',
    component: TabsPage,
    children: [
      {
        path: 'tab1',
        children: [
          {
            path: '',
            loadChildren: './tab1/tab1.module#Tab1PageModule'
          }
        ]
      },
      {
        path: '',
        redirectTo: '/tabs/tab1',
        pathMatch: 'full'
      }
    ]
  }
];

@NgModule({
  imports: [
    RouterModule.forRoot(routes, {preloadingStrategy: PreloadAllModules})
  ],
  exports: [RouterModule]
})
export class AppRoutingModule {
}

Ionic 4, Angular nested routes - why one way possible but not the other?

0 个答案: