Exploring Angular 8 WebSocket Example: A Comprehensive Guide

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Introduction

Angular 8 is a popular open-source JavaScript framework used for developing dynamic web applications. It comes with a wide range of features and tools that make it easy to build complex web applications with ease. One of the most important features of Angular 8 is WebSockets. WebSockets allow for real-time communication between the client and server, enabling developers to build applications that update in real-time.

In this article, we will explore how to use WebSockets in Angular 8 with a practical example. We will cover everything from setting up the environment to building an application that uses WebSockets for real-time communication. So, let’s get started!

Setting Up the Environment

The first step in using WebSockets in Angular 8 is to set up the environment. Here are the steps to follow:

Step 1: Install Node.js and Angular CLI

Node.js is a JavaScript runtime that allows developers to run JavaScript on the server-side. Angular CLI is a command-line interface that makes it easy to create and manage Angular 8 projects. To install Node.js and Angular CLI, follow these steps:

  1. Download and install Node.js from the official website.
  2. Open a terminal or command prompt and run the following command to install Angular CLI:

  3. npm install -g @angular/cli

Step 2: Create a New Angular 8 Project

Once you have installed Node.js and Angular CLI, the next step is to create a new Angular 8 project. Here are the steps to follow:

  1. Open a terminal or command prompt and navigate to the directory where you want to create the project.
  2. Run the following command to create a new Angular 8 project:

  3. ng new my-app

This will create a new Angular 8 project with the name “my-app”.

Step 3: Install Socket.IO Client

The next step is to install Socket.IO client, which is a library that makes it easy to use WebSockets in Angular 8. Here are the steps to follow:

  1. Open a terminal or command prompt and navigate to the root directory of your Angular 8 project.
  2. Run the following command to install Socket.IO client:

  3. npm install socket.io-client –save

This will install Socket.IO client and add it as a dependency to your project.

Building an Angular 8 Application with WebSockets

Now that we have set up the environment, the next step is to build an Angular 8 application that uses WebSockets for real-time communication. Here are the steps to follow:

Step 1: Create a WebSocket Service

The first step is to create a service that will handle the WebSocket communication. Here are the steps to follow:

  1. Open a terminal or command prompt and navigate to the root directory of your Angular 8 project.
  2. Run the following command to create a new service:

  3. ng generate service websocket

This will create a new service with the name “websocket” in the “src/app” directory.

Open the “websocket.service.ts” file and add the following code:

import { Injectable } from '@angular/core';import * as io from 'socket.io-client';import { Observable } from 'rxjs';
@Injectable({providedIn: 'root'})export class WebsocketService {private socket: any;private readonly url: string = 'http://localhost:3000';
constructor() {this.socket = io(this.url);}
public sendMessage(message: string): void {this.socket.emit('message', message);}
public getMessage(): Observable {return new Observable(observer => {this.socket.on('message', (data: string) => {observer.next(data);});});}}

This code imports the necessary dependencies and creates a WebSocket service that connects to the server at “http://localhost:3000”. It also provides methods for sending and receiving messages.

Step 2: Create a Component for Sending Messages

The next step is to create a component that will allow users to send messages to the server. Here are the steps to follow:

  1. Open a terminal or command prompt and navigate to the root directory of your Angular 8 project.
  2. Run the following command to create a new component:

  3. ng generate component send-message

This will create a new component with the name “send-message” in the “src/app” directory.

Open the “send-message.component.ts” file and add the following code:

import { Component } from '@angular/core';import { WebsocketService } from '../websocket.service';
@Component({selector: 'app-send-message',templateUrl: './send-message.component.html',styleUrls: ['./send-message.component.css']})export class SendMessageComponent {public message: string;
constructor(private websocketService: WebsocketService) { }
public sendMessage(): void {this.websocketService.sendMessage(this.message);this.message = '';}}

This code imports the WebSocket service and creates a component that allows users to send messages to the server.

Step 3: Create a Component for Receiving Messages

The final step is to create a component that will display the messages received from the server. Here are the steps to follow:

  1. Open a terminal or command prompt and navigate to the root directory of your Angular 8 project.
  2. Run the following command to create a new component:

  3. ng generate component receive-message

This will create a new component with the name “receive-message” in the “src/app” directory.

Open the “receive-message.component.ts” file and add the following code:

import { Component, OnInit } from '@angular/core';import { WebsocketService } from '../websocket.service';
@Component({selector: 'app-receive-message',templateUrl: './receive-message.component.html',styleUrls: ['./receive-message.component.css']})export class ReceiveMessageComponent implements OnInit {public messages: string[] = [];
constructor(private websocketService: WebsocketService) { }
ngOnInit(): void {this.websocketService.getMessage().subscribe((message: string) => {this.messages.push(message);});}}

This code imports the WebSocket service and creates a component that displays the messages received from the server.

FAQs

What is Angular 8?

Angular 8 is a popular open-source JavaScript framework used for developing dynamic web applications. It comes with a wide range of features and tools that make it easy to build complex web applications with ease.

What are WebSockets?

WebSockets allow for real-time communication between the client and server, enabling developers to build applications that update in real-time.

How do I set up the environment for using WebSockets in Angular 8?

The first step is to install Node.js and Angular CLI. Then, create a new Angular 8 project and install Socket.IO client.

How do I build an Angular 8 application with WebSockets?

To build an Angular 8 application with WebSockets, create a WebSocket service, a component for sending messages, and a component for receiving messages.

Conclusion

In this article, we have explored how to use WebSockets in Angular 8 with a practical example. We have covered everything from setting up the environment to building an application that uses WebSockets for real-time communication. With this knowledge, you can now build real-time web applications using Angular 8 and WebSockets.

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