Sidenav (Menu / Submenu) Angular 4 Material Design 2 -


i'm working in project angular 4 , material design (angular material). have trouble sidenav menu. don't know how create sub menu or subcategories. need add (maths, communication, arts) below of each disability.

categories:

categories

this code:

  <md-list-item>     <md-icon md-list-icon>face</md-icon>     <span class="sidenav-item-name" md-line>{{category.name}}</span>     <md-icon>keyboard_arrow_down</md-icon>    </md-list-item>

i found example of menu didn't work:

<a>   <md-icon aria-hidden="true">trending_flat</md-icon>   <span>menu</span> <md-icon aria-hidden="true">chevron_right</md-icon>  </a>  <md-nav-list>   <md-list-item routerlinkactive="open">    <div > <a routerlinkactive="active-link" href="/pages/blank">sub menu1</a>    </div>   </md-list-item>   <md-list-item routerlinkactive="open">    <div > <a routerlinkactive="active-link" href="/pages/blank">sub menu2</a>    </div>   </md-list-item>  </md-nav-list>

i don't know how implement right or code or "class" need add. how looks.

menu error:

menu error


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