Sidenav selector unable to display Angular component

I'm facing a dilemma. I have the following code in my app.component.html file:

<mat-sidenav-container class="sidenav-container">
  <app-sidenav></app-sidenav>
  <mat-sidenav-content>
    <app-header></app-header>
    <router-outlet></router-outlet>
    <app-footer></app-footer>
  </mat-sidenav-content>
</mat-sidenav-container>

When implemented this way, my sidenav remains hidden. However, if I directly place the sidenav code within the file, it becomes visible and is part of the DOM:

<mat-sidenav-container class="sidenav-container">
  <mat-sidenav #sidenav id="mobile-menu-nav" class="sidenav" fixedInViewport="true" mode="over" position="end">
    <mat-toolbar>Menu</mat-toolbar>
    <mat-nav-list>
      <a mat-list-item href="#">Link 1</a>
      <a mat-list-item href="#">Link 2</a>
      <a mat-list-item href="#">Link 3</a>
    </mat-nav-list>
  </mat-sidenav>
  <mat-sidenav-content>
    <app-header></app-header>
    <router-outlet></router-outlet>
    <app-footer></app-footer>
  </mat-sidenav-content>
</mat-sidenav-container>

I have verified that my

<app-sidenav></app-sidenav>
component does exist:

import {AfterViewInit, Component, OnInit, ViewChild} from '@angular/core';
import {MatSidenav} from '@angular/material';
import {SidenavService} from '../services/sidenav-service.service';

@Component({
  selector: 'app-sidenav',
  templateUrl: './sidenav.component.html',
  styleUrls: ['./sidenav.component.css']
})
export class SidenavComponent implements OnInit, AfterViewInit {

  @ViewChild('sidenav') public sidenav: MatSidenav;

  constructor(private sidenavService: SidenavService) {
  }

  ngOnInit() {
  }

  ngAfterViewInit(): void {
    this.sidenavService.setSidenav(this.sidenav);
  }
}

In addition, the component is properly included in my app.module.ts file... Could someone point out what I might be overlooking?

Answer №1

It seems like the issue arises from nesting <mat-sidenav> within <app-sidenav> in your code snippet. Consider re-structuring your layout by removing <mat-sidenav> from inside <app-sidenav> and placing it directly under <mat-sidenav-container>. Here's an example:

<mat-sidenav-container class="sidenav-container">
  <mat-sidenav #sidenav id="mobile-menu-nav" class="sidenav" fixedInViewport="true" mode="over" position="end">
    <app-sidenav></app-sidenav>
  </mat-sidenav>
  <mat-sidenav-content>
    <app-header></app-header>
    <router-outlet></router-outlet>
    <app-footer></app-footer>
  </mat-sidenav-content>
</mat-sidenav-container>

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