Implementing event-driven architecture in smart contracts using JavaScript
Could someone explain I'm learning this framework and Currently developing a decentralized application where I'm trying to implement an event-driven architecture within my smart contracts... Specifically, I'm utilizing the Ethereum blockchain with Solidity for the contracts and Node.js to handle off-chain interactions. The goal is to listen for certain events emitted by the smart contracts, which will trigger actions on the client side. For instance, when a user successfully makes a transaction, I want to capture that event and update the UI accordingly in real-time. I’ve set up my smart contract like this: ```solidity pragma solidity ^0.8.0; contract MyContract { event TransactionCompleted(address indexed user, uint256 amount); function completeTransaction(uint256 amount) public { // Logic for transaction emit TransactionCompleted(msg.sender, amount); } } ``` On the Node.js side, I’m using `web3.js` to listen for these events. Here’s where I’m stuck: ```javascript const Web3 = require('web3'); const web3 = new Web3('https://your.ethereum.node'); const contractAddress = '0xYourContractAddress'; const contractABI = [ /* ABI array here */ ]; const myContract = new web3.eth.Contract(contractABI, contractAddress); myContract.events.TransactionCompleted({ filter: { user: '0xUserAddress' } }, (error, event) => { console.log(event); // Update UI based on event }); ``` Despite these setups, it seems the events aren’t firing as expected. I’ve confirmed that transactions are successfully being sent to the contract, but the event listener doesn't catch any events. I’ve verified the contract is deployed correctly and the ABI matches, and have even tried different configurations for the event listener. Additionally, I’ve ensured that the account address has sufficient gas and permissions. Could there be a specific configuration or a best practice regarding the event listener that I might be missing? Any insights would be greatly appreciated! I'm using Javascript stable in this project. Thanks, I really appreciate it!