web3-contract-interface/index.html at master · ACatThatPrograms/web3-contract-interface · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<meta http-equiv="X-UA-Compatible" content="ie=edge">
	<title>Web3 Contract Interface</title>
	<script src="./node_modules/web3/dist/web3.min.js"></script>
	<style>
		.container {
			display: flex;
		}

		.container div {
			margin: 10px;
		}
	</style>
</head>
<body>
	<div class="container">
		<div>
			<h1>Smart Contract Interface</h1>

			<p>
				<label for="contract">Contract Address</label><br />
				<input id="contract" type="text" size="50">
			</p>

			<p>
				<label for="abi">Contract ABI (JSON)</label><br />
				<textarea name="abi" id="abi" cols="50" rows="8">{}</textarea>
			</p>

			<p>
				<strong>Chain ID:</strong> <span id="info-chain-id"></span><br />
				<strong>Latest Block #:</strong> <span id="info-block-number"></span><br />
				<strong>Protocol Version:</strong> <span id="info-protocol"></span><br />
				<strong>Gas Price:</strong> <span id="info-gas-price"></span><br />
				<strong>Your Address:</strong> <small id="info-address"></small>
			</p>
		</div>

		<div>
			<h1>Transaction Information</h1>

			<p>
				<label for="method">Method</label><br />
				<input id="method" type="text" size="50">
			</p>

			<p>
				<label for="values">Parameters (array)</label><br />
				<textarea name="values" id="values" cols="50" rows="8">[]</textarea>
			</p>

			<p>
				<button id="button" onClick="sendTx()">Send Transaction</button>
			</p>

			<p>
				<strong>Result:</strong><br />
				<span id="result">No transaction sent yet</span>
			</p>

		</div>
	</div>

	<script>
		// Pull from local storage if previous values exist
		document.getElementById('contract').value = localStorage.getItem('contract');
		document.getElementById('method').value = localStorage.getItem('method');
		document.getElementById('abi').value = localStorage.getItem('abi') || '{}';
		document.getElementById('values').value = localStorage.getItem('values') || '[]';

		if (window.ethereum) {
			window.web3 = new Web3(window.ethereum);
			window.ethereum.enable();
		} else {
			alert("Web3 is not injected.");
		}

		web3.eth.getProtocolVersion().then(function(protocolVersion) {
			document.getElementById('info-protocol').innerHTML = protocolVersion;
		});

		web3.eth.getGasPrice().then(function(gasPrice) {
			document.getElementById('info-gas-price').innerHTML = web3.utils.fromWei(gasPrice, 'gwei') + " gwei";
		});

		web3.eth.getBlockNumber().then(function(blockNumber) {
			document.getElementById('info-block-number').innerHTML = blockNumber;
		});

		web3.eth.getChainId().then(function(chainId) {
			document.getElementById('info-chain-id').innerHTML = chainId;
		});

		var account;
		web3.eth.getAccounts().then(function(accounts) {
			if (accounts.length) {
				account = accounts[0];
				document.getElementById('info-address').innerHTML = account;
			} else {
				web3.eth.requestAccounts().then(function(accounts) {
					account = accounts[0];
					document.getElementById('info-address').innerHTML = account;
				});
			}
		})

		function sendTx() {
			if (!account) {
				alert("No account approved to interact with this page");
				return;
			}

			let contract = document.getElementById('contract').value;
			let abi = document.getElementById('abi').value;
			let method = document.getElementById('method').value;
			let values = document.getElementById('values').value;

			try {
				abi = JSON.parse(abi);
			} catch (ex) {
				alert("Invalid JSON for ABI");
				return;
			}

			try {
				values = JSON.parse(values);
			} catch (ex) {
				alert("Invalid JSON for method parameters");
				return;
			}

			// Store info locally for follow-up calls
			localStorage.setItem('contract', contract);
			localStorage.setItem('abi', JSON.stringify(abi));
			localStorage.setItem('method', method);
			localStorage.setItem('values', JSON.stringify(values));

			try {
				let contractWeb3 = new web3.eth.Contract(abi, contract, {
					'from' : account
				});

				for (let func of abi) {
					if (
						func.hasOwnProperty('type') &&
						func.type === 'function' &&
						(func.stateMutability === 'view' || func.stateMutability === 'pure') &&
						func.name === method
					) {
						document.getElementById('result').innerHTML = `Calling method ${method}...`;
						contractWeb3.methods[method](...values).call((err, res) => {
							document.getElementById('result').innerHTML = res;
						});
						return;
					} else if (
						func.hasOwnProperty('type') &&
						func.type === 'function' &&
						(func.stateMutability === 'payable' || func.stateMutability === 'nonpayable') &&
						func.name === method
					) {
						document.getElementById('result').innerHTML = `Sending tx: ${method}...`;
						contractWeb3.methods[method](...values).send()
							.on('transactionHash', function(hash){
								document.getElementById('result').innerHTML = `Submitted, tx hash ${hash}...`;
							})
							.on('receipt', function(receipt){
								document.getElementById('result').innerHTML = "<pre>" + JSON.stringify(receipt, null, 2) + "</pre>";
							})
							.on('error', function(error, receipt) {
								document.getElementById('result').innerHTML = error + "<br /><br />Receipt<br /><pre>" + JSON.stringify(receipt, null, 2) + "</pre>";
							});
						return;
					}
				}

			} catch (ex) {
				console.error(ex);
				document.getElementById('result').innerHTML = String(ex);
				return;
			}
		}
	</script>
</body>
</html>