Angular Event handling tutorial

Angular Event handling tutorial

In this tutorial, we are going to learn about how to handle the events in angular with the help of examples.

Listening events

To listen the events in angular we need to wrap the eventname with a () parenthesis.

app.component.html
<!-- listening for the click event -->
<button (click)="handleClick()">Click me</button>

In the above code we are listening for the click event on a button, so that whenever a user clicks on a button the handleClick method is invoked.

Passing arguments

Event handler methods can also accept arguments let’s see an example.

app.component.ts
import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  name = 'angular tutorial';   // at time of invocation we need to pass an argument
  changeName(myname: string): void {    this.name = myname;  }}
app.component.html
<div>
    <h1>{{name}}</h1>     <!-- passing the argument to  `changeName` method -->
    <button (click)="changeName('gowtham')">Change name</button></div>

In the above code ,first we created a changeName method with parameter myname inside our app.component.ts file, so that inside our markup we are passing the gowtham as an argument to changeName method.

Accessing the event object

To access the event object in handler methods, we need to use the $event variable let’s see an example.

app.component.html
  <!-- passing the `$event` as an argument -->
<button (click)="handleMe($event)">click me</button>
app.component.ts
import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})

export class AppComponent {
   handleMe(event:any){       //logging event object     console.log(event)   }

}

accesing-event-object-angular