如何使用有角度的mat-nav材质创建嵌套菜单？ （更新）

Question

我正在尝试为我的有角度的应用程序创建一个嵌套的菜单项。我只有一些解决方案，其中嵌套选项会显示为弹出窗口，我希望它是一个下拉菜单，触发时我们可以选择位于其下方的菜单。

我尝试使用mat-sidenav-container，并根据条件给出了一些打开菜单的条件

 <mat-nav-list>
     <mat-list-item (click)="showSubmenu = !showSubmenu" class="parent">
          <span class="full-width" *ngIf="isExpanded || 
            isShowing">Users</span>
       <mat-icon mat-list-icon>supervisor_account</mat-icon>
        <mat-icon class="menu-button" [ngClass]="{'rotated' : 
          showSubmenu}" *ngIf="isExpanded || 
             isShowing">expand_more</maticon>
        </mat-list-item>
        <div class="submenu" [ngClass]="{'expanded' : showSubmenu}" 
           *ngIf="isShowing || isExpanded">
          <div [routerLink]="['users']" routerLinkActive="active" 
             (click)="toggleSide()">Add Users</div>
          </div>
    </mat-nav-list>
``in the above code. i would like to nest Manage Users under Users list item``` and my .ts file follows:

showSubmenu: boolean = false;
  isShowing = false;
  showSubSubMenu: boolean = false;
  isExpanded = true;

i would like the expected result to be like this (https://stackblitz.com/edit/material-sidenav-example?file=app%2Fsidenav-autosize-example.html)

我确实尝试使用与上述链接相同的元素，但无法正常工作。我可能犯了一个非常愚蠢的错误。在此先感谢!!

Answer 1

您可以实现通用菜单列表项， 这是一个示例：

https://dynamic-nested-sidenav-menu.stackblitz.io

Answer 2

根据角度材料

     <button mat-button [matMenuTriggerFor]="animals">Animal index</button>

<mat-menu #animals="matMenu">
  <button mat-menu-item [matMenuTriggerFor]="vertebrates">Vertebrates</button>
  <button mat-menu-item [matMenuTriggerFor]="invertebrates">Invertebrates</button>
</mat-menu>

<mat-menu #vertebrates="matMenu">
  <button mat-menu-item [matMenuTriggerFor]="fish">Fishes</button>
  <button mat-menu-item [matMenuTriggerFor]="amphibians">Amphibians</button>
  <button mat-menu-item [matMenuTriggerFor]="reptiles">Reptiles</button>
  <button mat-menu-item>Birds</button>
  <button mat-menu-item>Mammals</button>
</mat-menu>

<mat-menu #invertebrates="matMenu">
  <button mat-menu-item>Insects</button>
  <button mat-menu-item>Molluscs</button>
  <button mat-menu-item>Crustaceans</button>
  <button mat-menu-item>Corals</button>
  <button mat-menu-item>Arachnids</button>
  <button mat-menu-item>Velvet worms</button>
  <button mat-menu-item>Horseshoe crabs</button>
</mat-menu>

<mat-menu #fish="matMenu">
  <button mat-menu-item>Baikal oilfish</button>
  <button mat-menu-item>Bala shark</button>
  <button mat-menu-item>Ballan wrasse</button>
  <button mat-menu-item>Bamboo shark</button>
  <button mat-menu-item>Banded killifish</button>
</mat-menu>

<mat-menu #amphibians="matMenu">
  <button mat-menu-item>Sonoran desert toad</button>
  <button mat-menu-item>Western toad</button>
  <button mat-menu-item>Arroyo toad</button>
  <button mat-menu-item>Yosemite toad</button>
</mat-menu>

<mat-menu #reptiles="matMenu">
  <button mat-menu-item>Banded Day Gecko</button>
  <button mat-menu-item>Banded Gila Monster</button>
  <button mat-menu-item>Black Tree Monitor</button>
  <button mat-menu-item>Blue Spiny Lizard</button>
  <button mat-menu-item disabled>Velociraptor</button>
</mat-menu>

Answer 3

根据您的代码

     <mat-nav-list style="width:300px">
        <mat-list-item (click)="showSubmenu = !showSubmenu" class="parent">
            <span class="full-width" *ngIf="isExpanded || 
                isShowing">Users</span>
            <mat-icon mat-list-icon>supervisor_account</mat-icon>
            <mat-icon class="menu-button" [ngClass]="{'rotated' : 
              showSubmenu}" *ngIf="isExpanded || 
                 isShowing">expand_more</mat-icon>
            </mat-list-item>
        <div *ngIf="showSubmenu">
        <a menu-list-item >
          Mangage users
        </a>
        </div>
            <div class="submenu" [ngClass]="{'expanded' : showSubmenu}" 

               *ngIf="isShowing || isExpanded">
              <div  
                 (click)="toggleSide()">Add Users</div>
              </div>
        </mat-nav-list>

但是，这在实践中不好，如果您有很多嵌套，在这种情况下，请使用通用嵌套。