<aside> 📜 TABLE OF CONTENTS

1. 📘 Introduction to XRP Ledger

2. 🔑 XRP Ledger Basics

3. 💻 Interacting with XRP Ledger

4. 🏗️ Building dApps on XRPL with React

5. 🔗 EVM Sidechain Integration for XRPL

6. 🛠️ Non-EVM Development

7. 📚 Resources and References

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http://quiz.xrplsea.org

🚀 Comprehensive Guide to Building dApps on XRPL

🏗️ Introduction to XRPL dApp Architecture

Developing decentralized applications (dApps) on the XRP Ledger requires a thoughtful architectural approach that leverages the strengths of both blockchain technology and traditional web development.

💡 XRPL dApps typically follow a client-server model, with the XRPL serving as a decentralized backend database and transaction processor.

The architecture of an XRPL dApp should be designed to provide a seamless user experience while leveraging the security and efficiency of the XRP Ledger. This often involves creating a responsive frontend that can interact with the XRPL in real-time, backed by a robust server that handles complex operations and maintains application state.

Key Components of XRPL dApp Architecture

Frontend

• User interface (UI) built with web technologies (HTML, CSS, JavaScript)
• Integration of browser API

Backend

• Integration with XRPL nodes for ledger interactions (In this case handled by Crossmark)

🛠️ Prerequisites

• Basic knowledge of React and TypeScript
• Node.js and npm installed
• Crossmark Browser Wallet extension installed

🏗️ Setting Up the Project

1. Clone the repository:

   
   git clone <https://github.com/maximedgr/xrpl-quickstart-react-crossma>
   

2. Navigate to the project directory:

   
   cd xrpl-crossmark-react-template
   

3. Install dependencies:

   
   npm install
   

🔧 Crossmark SDK Integration

The Crossmark SDK is at the heart of this project. It's imported in each component:

import sdk from "@crossmarkio/sdk";

This SDK provides methods for interacting with the Crossmark wallet and the XRPL.

📊 Component 1: Account Information

This component displays the user's XRPL address and network details, utilizing the Crossmark SDK for network information.

import React, { useState, useEffect } from 'react';
import { useWallet } from '../context/WalletContext';
import sdk from "@crossmarkio/sdk";

// ... (rest of the code as provided earlier)

🔑 Key Crossmark SDK Usage:

• sdk.sync?.getNetwork(): Retrieves current network information

  
  const currentNetwork = await sdk.sync?.getNetwork();
  

💡 Implementation Notes:

• The useEffect hook uses the SDK to check for network updates every 5 seconds
• Network information from the SDK is displayed in real-time

🔗 Component 2: Wallet Connect

This component handles the Crossmark wallet connection process, heavily relying on the SDK for wallet-related operations.

import React, { useState } from 'react';
import sdk from "@crossmarkio/sdk";
import { useWallet } from '../context/WalletContext';

// ... (rest of the code as provided earlier)

🔑 Key Crossmark SDK Usage:

• sdk.sync.isInstalled(): Checks if the Crossmark wallet is installed

  
  const installed = sdk.sync.isInstalled();
  

• sdk.async.signInAndWait(): Initiates the wallet connection process

  
  let response = await sdk.async.signInAndWait();
  

💡 Implementation Notes:

• The SDK provides a seamless way to check wallet installation and initiate connection
• User's address is retrieved directly from the SDK's sign-in response

🔄 Component 3: Interactions

This component showcases various XRPL interactions, all powered by the Crossmark SDK.

import React, { useState } from "react";
import sdk from "@crossmarkio/sdk";
import { useWallet } from '../context/WalletContext';

// ... (rest of the code as provided earlier)

🔑 Key Crossmark SDK Usage:

• sdk.session.user?.id: Retrieves the current user session

  
  let id = sdk.session.user?.id;
  
  

• sdk.async.signAndWait(): Signs a transaction

  
  let resp = await sdk.async.signAndWait({
    TransactionType: "Payment",
    Account: address,
    Destination: "rK8jihXBZCFWZqX95SET3CCi1WdRgZQwex",
    Amount: "11000000",
  });
  
  

• sdk.async.submitAndWait(): Submits a signed transaction

  
  let resp = await sdk.async.submitAndWait(signInResponse, signTransactionTxblob);
  

💡 Implementation Notes:

• The SDK simplifies complex XRPL operations into easy-to-use async methods
• Error handling should be implemented around these SDK calls for robustness

🚀 Leveraging Crossmark SDK for Advanced Features

1. Real-time Balance Updates: Use sdk.sync.getAccountInfo() to fetch and display account balances.
2. Transaction History: Implement sdk.sync.getAccountTransactions() to show user's transaction history.
3. Custom Transactions: Utilize sdk.async.signAndWait() with different transaction types for various XRPL operations.
4. Network Switching: Implement network switching using sdk.sync.setNetwork() for testing on different XRPL environments.

🎨 Styling Tips

• Create consistent button styles for all SDK-triggered actions
• Implement loading states for asynchronous SDK operations
• Use tooltips to explain SDK-related functionalities to users

🚀 Next Steps

1. Implement comprehensive error handling for all SDK method calls
2. Create a custom hook to manage SDK state and operations
3. Build additional components that showcase more Crossmark SDK features
4. Consider implementing a state management solution to handle complex SDK-related state updates

🎓 Conclusion

By leveraging the power of the Crossmark SDK, you can create robust, feature-rich applications that interact seamlessly with the XRP Ledger.

Happy coding! 🎉