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static.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.0/dist/css/bootstrap.min.css">
<script src="https://cdn.jsdelivr.net/npm/web3@1.4.0/dist/web3.min.js"></script>
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<title>MetaMask Web3js Contract Integration</title>
</head>
<body>
<style>
.meta-gray {
-webkit-filter: grayscale(1);
}
.meta-normal {
-webkit-filter: grayscale(0);
}
</style>
<div class="container">
<div style="margin-top: 30px;" class="row text-center">
<div class="col-md-12">
<h3>MetaMask Web3js Smart Contract Integration</h3>
<p>The code here is adapted from an excellent article
<a href="http://blog.adnansiddiqi.me/build-your-first-solidity-dapp-with-web3-js-and-metamask/" target="_blank">
Build Your First Solidity Dapp With Web3.js and MetaMask
</a>
by Adnan Siddiqi with minor modifications for the
<a href="https://github.com/limcheekin/eth-dapps-nextjs-boiletplate/blob/main/contracts/Greeter.sol" target="_blank">Greeter smart contract</a>,
full credit should be given to him.
</p>
</div>
</div>
<div class="row">
<div class="col-md-12">
<ul>
<li>
First, if you are running the sample dApp from Google Chrome, you need to start the server from the <code>client</code> directory
using <code>npm run dev</code> due to the CORS origin error.
</li>
<li>
Start the truffle development environment with <code>truffle develop</code>, run <code>compile</code> and <code>migrate</code> after it is started.
</li>
<li>Copy the contract address under <code>Deploying 'Greeter'</code>section, something like <code>0xd3bb084045105850C2C9E59d5e5Ae8Bf90D40829</code>
and update the <code>let contractAddress = '0x...'</code> at line 101.</li>
<li>You're ready! Go to <a href="http://localhost:3000/static.html">localhost:3000/static.html</a>.
</ul>
</div>
</div>
<div class="row text-center">
<div class="col-md-12">
<img id="metaicon" class="meta-gray" width="100" height="100" src="data:image/png;base64,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" alt="">
</div>
</div>
<div style="margin-top: 30px;" class="row text-center">
<div class="col-md-12">
<button id="enableMetamask" class="btn btn-primary">Connect with Metamask</button>
</div>
</div>
<div class="row text-center">
<div class="col-md-12">
<span id="status"></span>
</div>
</div>
<section class="contract-section hidden">
<div style="margin-top: 30px;" class="row text-center">
<div class="col-md-12">
<h5>Contract Info</h5>
</div>
</div>
<div class="row text-center">
<div class="col-md-12">
<span>Current Value: <i id="getValue"></i></span>
</div>
</div>
<div class="row text-center">
<div class="col-md-4 offset-4">
<span>Set Value: <input id="value" type="text" class="form-control" value=""> <button id="setValue" class="btn btn-primary">Set Value</button></span>
</div>
</div>
<div class="row text-center">
<div class="col-md-4 offset-4">
<span>Greet: <input id="name" type="text" class="form-control" value=""> <button id="greet" class="btn btn-primary">Greet</button></span>
</div>
</div>
<div class="row text-center">
<div class="col-md-12">
<span><i id="greeting"></i></span>
</div>
</div>
</section>
</div>
<script>
let currentAccount = null;
let web3;
let abi;
let contractAddress = '0x4619AaCba38101bf438C2A2Ddd583AAe2A035c54'
function handleAccountsChanged(accounts) {
console.log('Calling HandleChanged')
if (accounts.length === 0) {
console.log('Please connect to MetaMask.');
$('#enableMetamask').html('Connect with Metamask')
} else if (accounts[0] !== currentAccount) {
currentAccount = accounts[0];
$('#enableMetamask').html(currentAccount)
$('#status').html('')
if(currentAccount != null) {
// Set the button label
$('#enableMetamask').html(currentAccount)
}
}
console.log('WalletAddress in HandleAccountChanged ='+currentAccount)
}
function connect() {
console.log('Calling connect()')
ethereum
.request({ method: 'eth_requestAccounts' })
.then(handleAccountsChanged)
.catch((err) => {
if (err.code === 4001) {
// EIP-1193 userRejectedRequest error
// If this happens, the user rejected the connection request.
console.log('Please connect to MetaMask.');
$('#status').html('You refused to connect Metamask')
} else {
console.error(err);
}
});
}
function detectMetaMask() {
try {
if (typeof window.ethereum !== 'undefined') {
web3 = new Web3(window.ethereum);
return true
} else {
web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:9545"));
return false
}
} catch (error) {
alert(error)
}
}
async function getValue() {
console.log('GetValue')
const contract = new web3.eth.Contract(
abi,
contractAddress
);
contract.methods.greeting().call().then(function (result) {
$('#getValue').html(result)
});
}
async function setValue() {
console.log('Set Value')
input_value = $('#value').val()
if(input_value.trim() == '') {
input_value = 0
}
if(!isNaN(input_value)) {
input_value = parseInt(input_value)
}
const contract = new web3.eth.Contract(
abi,
contractAddress
);
contract.methods.setGreeting(input_value).send({from:currentAccount}).then(function (result) {
console.log(result);
getValue();
});
}
async function greet() {
console.log('Greet')
input_value = $('#name').val()
if(input_value.trim() == '') {
input_value = '[Please enter your name]'
}
if(!isNaN(input_value)) {
input_value = parseInt(input_value)
}
const contract = new web3.eth.Contract(
abi,
contractAddress
);
contract.methods.greet(input_value).call().then(function (result) {
console.log(result);
$('#greeting').html(result)
});
}
</script>
<script>
$.getJSON("Greeter.json", function(result) {
abi = result.abi
//Fetch Value from Smart Contract
getValue()
});
$( document ).ready(function() {
m = detectMetaMask()
if(m) {
$('#metaicon').removeClass('meta-gray')
$('#metaicon').addClass('meta-normal')
$('#enableMetamask').attr('disabled',false)
connect() // Make sure the connected wallet is being returned
} else {
$('#enableMetamask').attr('disabled',true)
$('#metaicon').removeClass('meta-normal')
$('#metaicon').addClass('meta-gray')
}
$('#enableMetamask').click(function() {
connect()
});
$('#setValue').click(function() {
setValue()
});
$('#greet').click(function() {
greet()
});
})
</script>
</body>
</html>