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sogoiii/ListenToEventsWeb3-1-0-0-beta.js

Last active December 26, 2023 23:00
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Listening to Solidity events using web3 1.0.0 beta
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ListenToEventsWeb3-1-0-0-beta.js
const Web3 = require('web3') // Works with web3 1.0.0-beta27
const contractArtifact = require('./build/contracts/TutorialToken.json')
const web3 = new Web3()
const providerUrl = 'ws://localhost:8545' // requires # https://github.com/trufflesuite/ganache-cli/releases/tag/v7.0.0-beta.0 or https://github.com/trufflesuite/ganache/releases/tag/v1.1.0-beta.0
const provider = new Web3.providers.WebsocketProvider(providerUrl)
web3.setProvider(provider)
web3.eth.net.getId()
.then(networkId => {
const contractAddr = contractArtifact.networks[networkId].address
const TutorialToken = new web3.eth.Contract(contractArtifact.abi, contractAddr)
TutorialToken.events.Transfer({fromBlock: 0}, function(error, event){ console.log(error) })
.on('data', (log) => {
let { returnValues: { from, to, value }, blockNumber } = log
console.log(`----BlockNumber (${blockNumber})----`)
console.log(`from = ${from}`)
console.log(`to = ${to}`)
console.log(`value = ${value}`)
console.log(`----BlockNumber (${blockNumber})----`)
})
.on('changed', (log) => {
console.log(`Changed: ${log}`)
})
.on('error', (log) => {
console.log(`error: ${log}`)
})
})
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