index.js

import { ethers } from "./ethers-5.2.esm.min.js"
import { ABI, contractAddress } from "./constants.js"

const connectButton = document.getElementById("connectButton")
const fundButton = document.getElementById("fundButton")
const balanceButton = document.getElementById("balanceButton")
const withdrawButton = document.getElementById("withdrawButton")
connectButton.onclick = connect
fundButton.onclick = fund
balanceButton.onclick = getBalance
withdrawButton.onclick = withdraw

async function getBalance() {
    if (typeof window.ethereum != undefined) {
        const provider = new ethers.providers.Web3Provider(window.ethereum)
        const balance = await provider.getBalance(contractAddress)
        console.log(ethers.utils.formatEther(balance))
    }
}

async function connect() {
    if (typeof window.ethereum !== undefined) {
        await window.ethereum.request({ method: "eth_requestAccounts" })
        connectButton.innerHTML = "Connected!"
    } else {
        connectButton.innerHTML = "No wallet detected"
    }
}

//fund function
async function fund() {
    const ethAmount = document.getElementById("ethAmount").value
    console.log(`Funding with ${ethAmount}`)
    if (typeof window.ethereum !== undefined) {
        //provider / connection to blockchain
        //signer / wallet
        //contract
        //ABI & Address
        const provider = new ethers.providers.Web3Provider(window.ethereum)
        const signer = provider.getSigner()
        const contract = new ethers.Contract(contractAddress, ABI, signer)
        try {
            const transactionResponse = await contract.fund({
                value: ethers.utils.parseEther(ethAmount),
            })
            //listen for the tx to be mined
            //listen for an event
            await listenForTransactionMine(transactionResponse, provider)
            console.log("Done!")
        } catch (error) {
            console.log(error)
        }
    }
}

function listenForTransactionMine(transactionResponse, provider) {
    console.log(`Mining ${transactionResponse.hash}...`)
    return new Promise((resolve, reject) => {
        provider.once(transactionResponse.hash, (transactionReceipt) => {
            console.log(
                `Completed with ${transactionReceipt.confirmations} confirmations`
            )
            resolve()
        })
    })
    // create a listener for the blockchain
}
async function withdraw() {
    console.log(`Withdrawing...`)
    if (typeof window.ethereum !== undefined) {
        const provider = new ethers.providers.Web3Provider(window.ethereum)
        const signer = provider.getSigner()
        const contract = new ethers.Contract(contractAddress, ABI, signer)
        try {
            const transactionResponse = await contract.withdraw()
            //listen for the tx to be mined
            //listen for an event
            await listenForTransactionMine(transactionResponse, provider)
            console.log("Done!")
        } catch (error) {
            console.log(error)
        }
    }
}