angular - Angular2 detecting change in transclusion -


i'm working in new component implement dot navigation. enter image description here

the parent container component called dotnavigationcomponent , each page dotnavigationpage. page selector created in dotnavigationcomponent want change page clicking on dots. i'm trying using transclusion.

import {component,         eventemitter,         contentchildren,         oninit,         aftercontentinit,         optional,         host,         input,         querylist,         injectable } '@angular/core';  @component({     selector: 'dot-navigation-page',     template: `         <ng-content *ngif="showing"></ng-content>     `, }) export class dotnavigationpage implements aftercontentinit {     @input("page") page:number;     public changepage:eventemitter<any> = new eventemitter();       public showing:boolean = false;     constructor() {}      ngaftercontentinit() {         if(this.page == 0){             this.showing = true;         }         this.changepage.subscribe((index)=>{             this.showing = false;             if(this.page == index){                 this.showing = true;             }         })     } }  @component({     selector: 'dot-navigation',     template: `         <div class="dot-navigation">             <ng-content></ng-content>         </div>         <div class="dot-navigation-scroll">             <span (click)="nextpage(page)" *ngfor="let page of numpages">o</span>         </div>         `,     styles: [`         .dot-navigation-scroll{             display: flex;             justify-content: center;         }     `] }) export class dotnavigationcomponent implements aftercontentinit {     public numpages:number[] = [];     @contentchildren(dotnavigationpage) pages:querylist<dotnavigationpage> ;      constructor(){}      ngaftercontentinit(){         for(let = 0; < this.pages.length; i++){             this.numpages.push(i);         }         this.pages.foreach(page => {             page.changepage.subscribe(()=>{console.log("test")})         })     }      nextpage(index:number){         console.log(index);         this.pages.foreach(p=>{             p.changepage.emit(index);         })     } }  @injectable() export class dotservice{     changepage:eventemitter<number> = new eventemitter<number>(); }

the problem pagecomponents not changing when change page. have try modify directly pagecomponents attributes.

any idea? thanks!


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