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Pass Event From Child Component To Parent Component Angular 5

One of the fundamental aspects of building dynamic web applications with Angular 5 is the interaction between parent and child components. In this article, we'll delve into a common challenge many developers face - passing an event from a child component to a parent component in Angular 5.

When working with Angular components, it's essential to understand that data flows downward from parent components to child components by using property bindings. However, when you need to communicate back from a child to a parent, events play a crucial role.

To facilitate passing an event from a child component to a parent component, Angular provides a way to define custom events using the `@Output` decorator. This decorator allows us to emit custom events that the parent component can subscribe to and act upon.

Let's walk through a practical example to illustrate how this can be achieved. Suppose we have a child component named `ChildComponent` and a parent component named `ParentComponent`. In the child component, we create an event emitter using `@Output` and emit an event when a certain action occurs.

Javascript

import { Component, EventEmitter, Output } from '@angular/core';

@Component({
  selector: 'app-child',
  template: `
    <button>Click me</button>
  `
})
export class ChildComponent {
  @Output() customEvent = new EventEmitter();

  onClick() {
    this.customEvent.emit('Event data to pass to parent');
  }
}

In this example, the `ChildComponent` class defines an output property named `customEvent`, which is an instance of `EventEmitter`. The `onClick` method emits an event with a custom message whenever the button is clicked.

Now, in the `ParentComponent` class, we can listen to this custom event emitted by the child component and handle it accordingly.

Javascript

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

@Component({
  selector: 'app-parent',
  template: `
    
  `
})
export class ParentComponent {
  onCustomEvent(data: string) {
    console.log('Event data received from child:', data);
    // Handle the event data as needed
  }
}

In the `ParentComponent` template, we bind the `onCustomEvent` method to the custom event emitted by the `ChildComponent`. When the event is triggered in the child component, the parent component receives the event data and can take appropriate action.

In conclusion, passing events from child to parent components in Angular 5 involves defining custom events using `@Output` decorators in the child component and subscribing to these events in the parent component. This pattern allows for seamless communication between components in your Angular applications, enabling you to build interactive and responsive web experiences.

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