How to Pass Data with EventEmitter Angular
In Angular, the EventEmitter is a powerful tool that allows components to communicate with each other. It is particularly useful when you need to pass data from a child component to a parent component or vice versa. In this article, we will explore how to pass data with EventEmitter in Angular, providing you with a step-by-step guide to ensure smooth communication between components.
Firstly, let’s understand what an EventEmitter is. An EventEmitter is a service that enables components to emit events and listen to them. It is a part of the RxJS library, which is a reactive programming library used in Angular. By using an EventEmitter, you can notify other components when a specific event occurs, and pass data along with that event.
To pass data with EventEmitter in Angular, follow these steps:
1. Create an EventEmitter in the parent component:
In your parent component, import the `EventEmitter` from the `events` module. Then, declare an instance of EventEmitter and add it to the component’s inputs or outputs.
“`typescript
import { EventEmitter } from ‘events’;
export class ParentComponent {
dataEmitter = new EventEmitter
// You can also add it to the inputs or outputs
// @Output() dataEmitter = new EventEmitter
}
“`
2. Emit data from the child component:
In the child component, you can emit the data to the parent component by calling the `emit` method on the EventEmitter instance. Pass the data you want to send as an argument to the `emit` method.
“`typescript
export class ChildComponent {
constructor(private parent: ParentComponent) {}
sendData() {
this.parent.dataEmitter.emit(‘Your Data Here’);
}
}
“`
3. Listen to the EventEmitter in the parent component:
In the parent component, you can subscribe to the EventEmitter to receive the data emitted by the child component. Use the `subscribe` method to listen for the event and handle the data accordingly.
“`typescript
export class ParentComponent {
dataEmitter = new EventEmitter
receivedData: string;
constructor() {
this.dataEmitter.subscribe((data) => {
this.receivedData = data;
});
}
}
“`
4. Trigger the event in the child component:
When you want to pass data from the child component to the parent component, call the `sendData` method in the child component. This will trigger the EventEmitter, and the parent component will receive the data.
By following these steps, you can effectively pass data with EventEmitter in Angular. Remember that the EventEmitter is a flexible and powerful tool that can be used to facilitate communication between components in complex Angular applications.
