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!


Comments

Post a Comment

Popular posts from this blog

angular - Ionic slides - dynamically add slides before and after -

hi i'm using ngfor create set of 3 slides while starting in middle i'm guaranteed able slide left or right on start. when slide right can simple listen reachedend , push slide array i'm looping. but have problem adding slide beginning. if same above , use e.g. array.unshift() or spread add item beginning, view think it's on position 0 , snaps view new slide. the code below work animates slide change index 1. slide = [0,1,2] //example loop slidechanged(event) { if(this.slides.isbeginning()){ this.slide = [this.slide[0]-1, ...this.slide]; this.slides.update(); this.slides.slideto(1) } } <ion-slides [initialslide]="1" (ionslidedidchange)="slidechanged($event)"> <ion-slide *ngfor="let item of slide"> <h1>slide {{item}}</h1> </ion-slide> </ion-slides> any appreciated! you can using ionslidenextend , ionslideprevend events slides . please
Read more

minify - Minimizing css files -

i want know how css files can minimized. currently, using external sites css minifier compress css files. however, after removing whitespaces, comments, etc, file sizes reduced 10-15%. how frameworks bootstrap manage make minimized versions kilobytes. as example, css is: body { background-color: #ff0; } the reduction goes 28 bytes 22 bytes other css files have lot more characters still smaller this. actually minifying code means it's remove thing code white space characters new line characters comments block delimiters it reduces amount of code has transferred on web , speed site load fastly.but unreadable format.
Read more

Add a dynamic header in angular 2 http provider -

i have http interceptor built via tutorial https://scotch.io/@kashyapmukkamala/using-http-interceptor-with-angular2 the problem need have dynamic header changes automatically once changes 'mode' in app. service able tell interceptor change header, or have interceptor pull header (which string)from service each request. able throwing away patch method, call http.patch('new header string') set header string. call in service controls 'mode' setting. wondering if there way interceptor pull recent value service each request or if can add method http provider via interceptor? i've tried call service in interceptor each request returns undefined. because creating new instance of service or copying value before service fired , loaded/changed data. i don't want pass header string every http provider call because defeats purpose of having interceptor, id able set once changes or have provider fetch service before makes request. tl;dr : need add autom
Read more