Angular 2 material nested md-list-item

Question

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>

which works fine and looks something like this:

Now when I try to nest it, for example

<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>

He looks like

I want to get a nested list, possibly collapsible. Any idea what I'm doing wrong or how to approach this?

Answer 1

Well, I realized if someone in the future gets stuck like that.

Do not do *ngforto md-list-itemrather do it on divlike 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>

which creates something like

Hope this helps someone someday