Angular 2材质嵌套md-list-item [英] Angular 2 material nested md-list-item

问题描述

使用Angular 2进行材质设计，尝试在sidenav中获取嵌套列表 我有类似

Using Angular 2 with material design, trying to get nested lists in sidenav I have code like

<md-sidenav #sidenav class="sidenav" mode="over" opened>
    <md-nav-list>
           <md-card class="user-card">
               <md-card-header>
                 <div md-card-avatar class="user-avatar"></div>
               </md-card-header>
           </md-card>
      <md-divider></md-divider>
      <md-list-item *ngFor="let category of ategories">
         <a md-line>{{ category.name }}</a> 
      </md-list-item>
    </md-nav-list>
</md-sidenav>

效果很好，看起来像

现在，当我尝试将其嵌套时，例如

Now When i try to nest it, like

<md-sidenav #sidenav class="sidenav" mode="over" opened>
    <md-nav-list>
           <md-card class="user-card">
               <md-card-header>
                 <div md-card-avatar class="user-avatar"></div>
               </md-card-header>
           </md-card>
      <md-divider></md-divider>
      <md-list-item *ngFor="let category of ategories">
         <a md-line>{{ category.name }}</a>
         <md-list-item *ngFor="let subcategory of category.subcategories">
            <a md-line>{{ subcategory.subcategory }}</a>
         </md-list-item>
      </md-list-item>
    </md-nav-list>
</md-sidenav>

它看起来像

我想实现嵌套列表，可能会折叠. 知道我在做什么错或如何解决吗?

I want to achieve nested list, probably collapsible. Any idea what am i doing wrong or how to approach this ?

推荐答案

好，如果将来有人像这样卡住，那就解决了.

Ok, figured it out, if someone in future gets stuck like this.

请勿在md-list-item上执行*ngfor，而应在div上执行此操作

Do no *ngfor on md-list-item, rather do it on div, like this

            <md-list>
                <div  *ngFor="let category of practice_categories">
                    <md-list-item>{{category.category}}</md-list-item>
                    <md-list style="margin-left:30px;">
                          <div *ngFor="let subcategory of category.subcategories">
                            <md-list-item>{{ subcategory.subcategory }}</md-list-item>
                          </div>
                    </md-list>
                </div>
            </md-list>

产生类似

希望有一天能对某人有所帮助

Hope this helps someone, someday

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