Handling Button Click in Angular

In Angular 18, you'll most often need to handle a button click, which is a basic aspect of developing interactive web applications. Angular offers a simple and easy to remember way to capture button click and handle actions based on those clicks.

Adding a button

You have different ways to make a button in Angular. Most frequently, you'll use the HTML <button> tag inside your component's template. Let's take a simple example. This is a button with the click event bound to a method that performs a desired action:

<button (click)="handleClick()">Click</button>

In this example (click) surrounded with parentheses is the way to tell Angular event binding to listen for the click event on the button and handleClick() that we pass to the click event, is the handler of that click, and should be defined in the associated component class, or else Angular will throw an error.

Adding a click handler

Now, let's add the click event handler method in the associated component class:

import { Component } from '@angular/core';

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

  constructor() { }

  handleClick() {
    // Perform actions here when the button is clicked
    console.log('Button clicked!');
  }
}

So here, handleClick() is our click handling method defined in the component class. It may perform any logic or action you need to run when the button is clicked. In our example, it simply displays a message to the browser's console.

When users click the button, Angular captures the click event and calls the handleClick() method. This method runs the contained actions, providing a simple method to handle user interactions.

Adding a click handler with parameters

You may need to pass parameters to the event handling method. In this case, you simply pass the parameters to the method as usual:

<button (click)="handleClick('param')">Click</button>

In the associated component's class, you need to design the method with the parameter(s) signature:

handleClick(param: string) {
  console.log('Button clicked with parameter:', param);
}

This allows you to customize the behavior of the event handler based on the specific context or data associated with the button click.

• Date: 25 May 2024