CODEWITHSUNDEEP
angularangularjs-components
sibi
sibi

Reputation: 675

Angularjs 2 @viewChild is not working

New to angularjs 2, I need to use @viewChild but it throws error as 'Cannot read property 'rotateLeft' of undefined'. parent :

<div><pdfReader [imageUrl]="imgsource" *ngIf="holeDocument.ext == 'pdf'"></pdfReader></div>

.ts 

import { Component ,ViewChild } from '@angular/core';
import {PdfReader} from "../../shared/pdfreader/pdfReader";
@Component({
selector: 'docView',
templateUrl: 'docView.html',
styleUrls : ["docView.less"]
})  
export class DocViewComponent{
@ViewChild('PdfReader') public pdfReader: PdfReader;
constructor(){}
ngAfterViewInit(){
    this.imageRotate();
}             
imageRotate(){ 
this.pdfReader.rotateLeft();
}}

Child : 

@Component({
selector: 'pdfReader',
templateUrl: 'pdfReader.html'
})
export class PdfReader{
 @Input() imageUrl : any;
 rotateLeft(){
        console.log('rotateLeft called');
        this.rotationAngel -= 90;
    }
}

Upvotes: 3

Views: 1145

Answers (2)

G&#252;nter Z&#246;chbauer
G&#252;nter Z&#246;chbauer

Reputation: 658067

If you use the component type to query, then the quotes are redundant

@ViewChild(PdfReader) public pdfReader: PdfReader;

If you use a string as query there needs to be a matching template variable

<div><pdfReader #PdfReader [imageUrl]="imgsource" *ngIf="holeDocument.ext == 'pdf'"></pdfReader></div>

See also angular 2 / typescript : get hold of an element in the template

Upvotes: 2

Subindev
Subindev

Reputation: 148

 *ngIf="holeDocument.ext == 'pdf'"

*ngIf is doing the trick. element is not rendered until that condition has met.

use [hidden] instead.

<pdfReader [imageUrl]="imgsource" [hidden]="holeDocument.ext != 'pdf'"></pdfReader>

Upvotes: 1

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