solidity-sample/IOU.html at master · gonsakon/solidity-sample · 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>Document</title>
    <script src="js/web3.min.js"></script>
</head>
<body>
    <h2>借據平台</h2>
    <input type="text" id="A" placeholder="請輸入借款人">
    <input type="text" id="B" placeholder="請輸入貸款人">
    <input type="text" id="money" placeholder="請輸入借款金額">

    <input type="button" id="send" value="送出修改內容">
    <script>
        var web3 = new Web3(window.web3.currentProvider);
        var Contract;
        var abi = [
	{
		"constant": false,
		"inputs": [
			{
				"name": "IOUMessage",
				"type": "bytes32"
			}
		],
		"name": "createIOU",
		"outputs": [],
		"payable": false,
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"anonymous": false,
		"inputs": [
			{
				"indexed": false,
				"name": "data",
				"type": "bytes32"
			},
			{
				"indexed": false,
				"name": "blockNumber",
				"type": "uint256"
			}
		],
		"name": "IOULog",
		"type": "event"
	},
	{
		"inputs": [],
		"payable": false,
		"stateMutability": "nonpayable",
		"type": "constructor"
	},
	{
		"constant": true,
		"inputs": [],
		"name": "message",
		"outputs": [
			{
				"name": "",
				"type": "string"
			}
		],
		"payable": false,
		"stateMutability": "view",
		"type": "function"
	}
];
        var address = '0xb1656f2DAE22D4AeD53F4766f75a06b9596F6e8e';
        async function init(){
            Contract = await new web3.eth.Contract(abi,address);

        }
        init();
        async function send(){
            var accounts = await web3.eth.getAccounts();
            var A = document.getElementById('A').value;
            var B = document.getElementById('B').value;
            var money = document.getElementById('money').value;
            var str = A+' borrowed '+money+' USD from '+B;
            var hexStr = web3.utils.utf8ToHex(str)
            Contract.methods.createIOU(hexStr)
            .send({from:accounts[0]})
            .then(function(data){
                console.log(data);
            })

        }
        document.getElementById('send').addEventListener('click',send);
    </script>
</body>
</html>