<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="../../libs/web3.js_v1.0.0-beta.35/web3.min.js"></script>
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<body>
<h1>Send ERC20 Token</h1>
<h2>Notes</h2>
<ul>
<li>Use MetaMask</li>
<li>To check ERC20 balance, use <a href="../getERC20TokenBalance/" target="_blank">getERC20TokenBalance</a></li>
</ul>
<h2>Token Address</h2>
<input type="text" id="token-address" size="80" oninput="onAddressChange()"></input>
<p>e.g. 0x2A65D41dbC6E8925bD9253abfAdaFab98eA53E34</p>
<h2>Recipients Address</h2>
<input type="text" id="to-address" size="80"></input>
<p>e.g. 0x8Df70546681657D6FFE227aB51662e5b6e831B7A</p>
<h2>Decimals</h2>
<input type="number" id="decimals" size="40" readonly></input>
<h2>Amount</h2>
<input type="number" id="amount" size="40"></input>
<div><button id="send" onclick="send()">Send ERC20 Token</button></div>
<h2>Result</h2>
<span id="result"></span>
<script>
var web3js;
var account;
function getERC20TokenBalance(tokenAddress, walletAddress, callback) {
let minABI = [
{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"type":"function"},
{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"type":"function"}
];
let contract = new web3js.eth.Contract(minABI, tokenAddress);
contract.methods.balanceOf(walletAddress).call((error, balance) => {
contract.methods.decimals().call((error, decimals) => {
console.log(balance);
console.log(decimals);
balance = balance / (10**decimals);
callback(balance);
});
});
}
function getERC20TokenContract(tokenAddress) {
let minABI = [
{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"type":"function"},
{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"type":"function"},
{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"name":"","type":"bool"}],"type":"function"}
];
return new web3js.eth.Contract(minABI, tokenAddress);
}
function getERC20TokenDecimals(callback) {
window.tokenContract.methods.decimals().call((error, decimals) => {
callback(decimals);
});
}
function onAddressChange(e) {
let tokenAddress = document.getElementById('token-address').value;
if(tokenAddress != "") {
window.tokenContract = getERC20TokenContract(tokenAddress);
getERC20TokenDecimals((decimals) => {
document.getElementById('decimals').value = decimals;
});
}
}
function transferERC20Token(toAddress, value, callback) {
window.tokenContract.methods.transfer(toAddress, value).send({from: account})
.on('transactionHash', function(hash){
callback(hash);
});
}
function send() {
var toAddress = document.getElementById('to-address').value;
var decimals = web3js.utils.toBN(document.getElementById('decimals').value);
var amount = web3js.utils.toBN(document.getElementById('amount').value);
var sendValue = amount.mul(web3js.utils.toBN(10).pow(decimals));
console.log(sendValue.toString());
transferERC20Token(toAddress, sendValue, (txHash) => {
document.getElementById('result').innerText = txHash;
});
}
window.onload = function() {
web3js = new Web3(Web3.givenProvider);
console.log(web3js.version);
var accountInterval = setInterval(function() {
web3js.eth.getAccounts((error, address) => {
if (address[0] !== account) {
account = address[0];
console.log(account);
}
});
}, 300);
}
</script>
</body>
</html>
https://github.com/piyolab/sushiether/commit/e35e949b5d898d357f9bd1d4e3f35b679974f192
