typescript - Angular 4 Accessing elements from another component -


i trying create side-nav , toolbar. want create separate components each have created 2 different components

code <app-sidenavmenu>

<md-sidenav-container class="sidenav-container">     <md-sidenav mode="push" class="sidenav" opened="false" #sidenav>         <md-list>             <md-list-item>...</md-list-item>         </md-list>     </md-sidenav> </md-sidenav-container>

and code <app-toolbar>

<md-toolbar>     <span><button md-button (click)="sidenav.toggle()"><md-icon>menu</md-icon></button></span>     <span><h2>app name</h2></span> </md-toolbar>

and in third home component using above components

now wanted access #sidenav side-nav component toolbar component side-nav toggle toggle function

how achieve this.

one way have appcomponent manage state of sidebar. has object both sidebar , navbar have reference too. navbar changes , sidebar response.

@component({   selector: 'my-app',   template: `     <my-navbar  [state]="state"></my-navbar>     <my-sidebar [state]="state"></my-sidebar>   ` }) export class app implements oninit {   state = {     showsidebar: true;   }; }  @component({   selector: 'my-navbar',   template: `     <div>       <span class="toggle" (click)="togglesidebar()">toggle</span> navbar     </div>   ` }) export class navbar implements oninit {   @input() state: any;    togglesidebar() {     this.state.showsidebar = !this.state.showsidebar;   } }  @component({   selector: 'my-sidebar',   template: `     <div *ngif="state.showsidebar">sidebar</div>   ` }) export class sidebar implements oninit {   @input() state: any; }

here's plunker:

https://plnkr.co/edit/ldpg25?p=preview

an alternative have service keeps track of navbar state you. pretty simple service require use of subject. subjects kind of events, navbar call service emit toggle, , sidebar subscribe service , toggle pushed it.

hopefully makes sense, feel free ask questions!


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