如何使用角垫导航材料创建嵌套菜单？ （更新）

Question

我正在尝试为我的 Angular 应用程序创建一个嵌套的垫子菜单项。我只在嵌套选项显示为弹出窗口的情况下得到了一些解决方案，我希望它是一个下拉菜单，我们可以在触发时选择位于其下方的菜单。

我尝试使用mat-sidenav-container，根据条件给了几个打开菜单的条件

 <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中相同的元素，但无法正常工作。我可能犯了一个非常愚蠢的错误。提前致谢！

Answer 1

你可以实现一个通用的菜单列表项， 这是一个例子：

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

Answer 2

来自你的代码

     <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>

但这在实践中并不好，如果你有很多嵌套，在那种情况下使用通用的。

Answer 3

与 OP 的特定需求无关，但这是我刚刚制作的一个有趣的嵌套菜单：

它演示了 Angular 模板如何与 Javascript 类似地工作，即模板创建一种闭包范围。因此，我能够创建一个没有重复代码的动态嵌套菜单。

这里的关键是方法调用

setFont(target, font)

，其中 target 的值是“关闭”的，因此当单击该项目时，它指的是正确的。

<!-- fonts menu -->
<mat-menu #fontMenu="matMenu">

    <ng-container *ngFor="let target of ['Header', 'Body']">
        
        <!-- submenu for each target -->
        <button mat-menu-item [matMenuTriggerFor]="fontsMenu">
            <span>{{ target }} font</span>
        </button>

        <!-- submenu for each font -->
        <mat-menu #fontsMenu="matMenu">
            <ng-container *ngFor="let font of ['Arial', 'Comic Sans']">

                <button mat-menu-item (click)="setFont(target, font)">
                    <span>{{ font }}</span>
                </button>  

            </ng-container>
        </mat-menu>

    </ng-container>

</mat-menu>

Answer 4

根据角材

     <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 5

我是这样做的

<mat-nav-list>
  <mat-accordion>
    <mat-expansion-panel style="box-shadow: none">
      <mat-expansion-panel-header style="margin-left: -8px">
        <mat-panel-title> <mat-icon>code</mat-icon>&nbsp;Developers </mat-panel-title>
      </mat-expansion-panel-header>
      <a
        mat-list-item
        routerLink="test"
        class="sidenav__list-item list-sub-item"
        [routerLinkActive]="['active']"
        (click)="handleClickEvent($event)"
      >
        <mat-icon>api</mat-icon>
        <span style="padding-top: 11px;">Api Keys</span>
      </a>
      <a
        mat-list-item
        routerLink="test1"
        class="sidenav__list-item list-sub-item"
        [routerLinkActive]="['active']"
        (click)="handleClickEvent($event)"
      >
        <mat-icon>webhook</mat-icon>
        <span style="padding-top: 11px;">Web Hooks</span>
      </a>
    </mat-expansion-panel>
  </mat-accordion>
</mat-nav-list>