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Integration of Web 3.0 with Angular Framework

Introduction

Web 3.0, often referred to as the decentralized web, is poised to revolutionize the internet by leveraging blockchain technology, smart contracts, and decentralized applications (dApps). As the evolution from Web 2.0 to Web 3.0 takes place, developers are exploring ways to integrate modern frameworks like Angular with Web 3.0 technologies to create robust, decentralized applications.

Angular, a popular front-end framework developed by Google, offers a powerful suite of tools for building dynamic web applications. By integrating Angular with Web 3.0, developers can take advantage of Angular's features while harnessing the power of decentralization. In this article, we’ll explore the process of integrating Web 3.0 with Angular, along with some practical code snippets.

Getting Started

Step 1. To begin with, you’ll need to have Node.js and Angular CLI installed on your machine. If you haven’t already, you can install them using the following commands.

# Install Node.js

npm install -g npm

# Install Angular CLI

npm install -g @angular/cli

Step 2. Create Angular Project.

# Create a new Angular project
ng new web3-angular-app

# Navigate into the project directory
cd web3-angular-app

Step 3. Setting Up Web3.js.

Web3.jsis is a JavaScript library that allows interaction with the Ethereum blockchain. To install Web3.js, run the following command.

npm install web3 --save

Step 4. After installing Web3.js, we need to configure it within our Angular project. Open the src/app/app.module.ts file and add Web3.jst to the providers.

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
import Web3 from 'web3';
@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule
  ],
  providers: [
    { provide: 'Web3', useFactory: () => new Web3(Web3.givenProvider || 'http://localhost:8545') }
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

Step 5. Creating a Service for Blockchain Interaction.

To interact with the blockchain, we’ll create a service. Generate a new service using the Angular CLI.

ng generate service blockchain

Step 6. In the blockchain.service.ts file, implement the methods to interact with the blockchain.

import { Injectable, Inject } from '@angular/core';
import Web3 from 'web3';

@Injectable({
  providedIn: 'root'
})
export class BlockchainService {
  private web3: Web3;
  private account: string | null = null;

  constructor(@Inject('Web3') web3: Web3) {
    this.web3 = web3;
    this.loadAccount();
  }

  private async loadAccount() {
    const accounts = await this.web3.eth.getAccounts();
    this.account = accounts[0];
    console.log('Account:', this.account);
  }

  public async getBalance(): Promise<string> {
    if (this.account) {
      return this.web3.eth.getBalance(this.account);
    }
    return '0';
  }
}

Step 7. Creating a Component to Display Blockchain Data

We’ll create a component to display the blockchain data. Generate a new component.

ng generate component blockchain-info

Step 8. In the blockchain-info.component.ts file, inject the BlockchainService and call its methods.

import { Component, OnInit } from '@angular/core';
import { BlockchainService } from '../blockchain.service';

@Component({
  selector: 'app-blockchain-info',
  templateUrl: './blockchain-info.component.html',
  styleUrls: ['./blockchain-info.component.css']
})
export class BlockchainInfoComponent implements OnInit {
  balance: string = '0';
  constructor(private blockchainService: BlockchainService) { }
  ngOnInit(): void {
    this.loadBalance();
  }
  private async loadBalance() {
    this.balance = await this.blockchainService.getBalance();
  }
}

Step 9. In the blockchain-info.component.html file, display the balance.

<div>
  <h2>Blockchain Info</h2>
  <p>Your balance: {{ balance }} wei</p>
</div>

Conclusion

Integrating Web 3.0 with Angular allows developers to build decentralized applications with the powerful features of both technologies. By leveraging Web3.js, Angular applications can interact with the Ethereum blockchain, providing users with decentralized, transparent, and secure experiences. As Web 3.0 continues to evolve, the integration of these technologies will pave the way for innovative applications that reshape the digital landscape.


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