Angular 11/10 ElementRef, ViewChild & QueryList Example

Today, i will let you know example of angular 11/10 elementref example. i explained simply step by step angular 10 ViewChild example. We will look at example of angular 10 QueryList. you will learn angular 10 elementref queryselector. Alright, let’s dive into the steps.

ElementRef is simply use for work with native DOM element in angular 10 application. you can simply access all methods and properties of native elements. you can easily work with DOM element in angular 10. 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...