javascript - *ngFor | async doesn't work -

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there input text each change, service search results. serivce returns : observable contain results. return multiple persons.

tamplate.html:

<input type="text" id="inputsearch"> ... <tr *ngfor="let person of items$ | async" ... ...

code:

import { component ,oninit} '@angular/core'; import {control} '@angular/common'; import {personservice} "./person.service"; import {person} "./person.class"; import {observable} "rxjs/rx"  @component({   selector: 'contact-table',   moduleid: module.id,   templateurl: 'contact-table.component.html',   styleurls: ['contact-table.component.css'] }) export class contacttable implements oninit {   private items$: observable<person[]>;   private inputchanged$:observable<{}>;    constructor(private _personservice:personservice) {}    public ngoninit() {     this.inputchanged$=observable.fromevent(document.getelementbyid("inputsearch"), 'input');     this.items$= this.inputchanged$       .map((event:any)=>event.target.value)       .switchmap((value:string) =>{         return this._personservice.getpersons(); <<-- gets here!****       })       .toarray();     this.items$.subscribe((persons:person[])=>{       console.log(persons); <<-- doesn't gets here!****     });   } }

update1:

by günter zöchbauer tip, added menual subscription in last line of method code never excuted , nothing gets logged. idea why?

update2: added full ts file of code.

updated3:

solved - don't know why: ( moved toarray() )

  public ngoninit() {     this.inputchanged$=observable.fromevent(document.getelementbyid("inputsearch"), 'input');     this.items$= this.inputchanged$       .map((event:any)=>event.target.value)       .switchmap((value:string) =>{         return this._personservice.getpersons().toarray(); <<-- moved here       }); <<-insead of here.      this.items$.subscribe((persons:person[])=>{       console.log(persons); <<-- doesn't gets here!****     });

any idea why made diffrence?


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