Is it possible to define an optional parameter in Ionic 3 PWA?
Currently, my @IonicPage decorator is set up like this:
@IonicPage({
segment: "landing/:id"
})
However, the id param needs to be optional. If I don't pass the id, I encounter this error:
Uncaught (in promise): invalid views to insert
How can I make it optional?
Thank you in advance!
At this time, there is no specific method in place. To work around this issue, simply send an empty string when it is not required.
this.navCtrl.push('landing', {
'id': ''
})
When using Ionic 4 with Angular, a useful solution involves handling different paths, specifically with optional ids in the URL:
{ path: 'landing', loadChildren: () =>
import("./landing/landing.module").then(m => m.LandingPageModule)},
{ path: 'landing/:id1', loadChildren: () =>
import("./landing/landing.module").then(m => m.LandingPageModule)},
{ path: 'landing/:id1/:id2', loadChildren: () =>
import("./landing/landing.module").then(m => m.LandingPageModule)}
The target remains constant throughout. The component is where the magic truly starts:
import { ActivatedRoute, Router } from "@angular/router";
@Component({
selector: "landing",
templateUrl: "./landing.page.html",
styleUrls: ["./landing.page.scss"]
})
export class landingPage implements OnInit {
constructor(
private route: ActivatedRoute,
private router: Router
) {}
ngOnInit() {
let id1= this.route.snapshot.paramMap.get("id1");
let id2= this.route.snapshot.paramMap.get("id2");
// Testing
if (id1) console.log(id1);
if (id2) console.log(id2);
}
}
Transitioning from page to page can be done as follows:
this.router.navigateByUrl('/landing');
this.router.navigateByUrl('/landing/' + '123');
this.router.navigateByUrl('/landing/' + '123/333');
The sequence in which these are executed matters, and remember to retain the trailing slash on the initial path.
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