Angular ElementRef|ViewChild|QueryList Tutorial

By Hardik Savani | October 20, 2020 | Category : Angular


This article will give you example of angular elementref example. I’m going to show you about angular ViewChild example. you can understand a concept of angular QueryList. We will use angular elementref queryselector. Let's get started with angular elementref trigger click.

you can also use elementref in angular 6, angular 7, angular 8, angular 9, angular 10 and angular 11 application.

ElementRef is simply use for work with native DOM element in angular application. you can simply access all methods and properties of native elements. you can easily work with DOM element in angular. sometime you need to add class, set value, get value from input, trigger click event on dom element at time this post will help you to do that.

So, here i will give you simple two example using ElementRef, ViewChildren, AfterViewInit, ViewChild & QueryList, first example will simply set data using innerHTML. second example will help you to list array and trigger click event.

so, let's see bellow example:

Example 1: Set Value

src/app/app.component.ts

import { Component, VERSION, ViewChild, ElementRef } from "@angular/core";

@Component({

selector: "my-app",

templateUrl: "./app.component.html",

styleUrls: ["./app.component.css"]

})

export class AppComponent {

name = "Angular " + VERSION.major;

@ViewChild("myDomeElem", { static: true }) myDomeElem: ElementRef;

ngOnInit() {

console.log(this.myDomeElem);

this.myDomeElem.nativeElement.innerHTML = "Changed Dom Element Value";

}

ngAfterViewInit() {

console.log(this.myDomeElem);

}

}

src/app/app.component.html

<div #myDomeElem>

</div>

Output:

Example 2: List & Trigger Click Event

src/app/app.component.ts

import { Component, VERSION, ViewChildren, QueryList, ElementRef } from "@angular/core";

@Component({

selector: "my-app",

templateUrl: "./app.component.html",

styleUrls: ["./app.component.css"]

})

export class AppComponent {

name = "Angular " + VERSION.major;

categories = [];

@ViewChildren('myItemLists') items: QueryList;

ngOnInit() {

this.categories = [

{

value: "Angular 8",

}, {

value: "Angular 9",

}, {

value: "Angular 10",

}

];

}

getCategory(event, category, i) {

console.log('category clicked : ', category);

console.log('event : ', event);

console.log('index of category : ', i);

console.log('all items : ', this.items)

}

}

src/app/app.component.html

<ul *ngFor="let category of categories;let i = index" #myItemLists>

<li (click)="getCategory($event, category, i)">{{ category.value }}</li>

</ul>

Output:

I hope it can help you...



Tags : Angular


Hardik Savani
My name is Hardik Savani. I'm a full-stack developer, entrepreneur and owner of Aatman Infotech. I live in India and I love to write tutorials and tips that can help to other artisan. I am a big fan of PHP, Javascript, JQuery, Laravel, Codeigniter, VueJS, AngularJS and Bootstrap from the early stage.
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