solidity-sample/messageBoard.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>目前的留言內容是：<em id="message"></em></h2>
    <input type="text" id="editMessage" placeholder="文字修改">
    <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": "editMessage",
                "type": "string"
            }
        ],
        "name": "editMessage",
        "outputs": [],
        "payable": false,
        "stateMutability": "nonpayable",
        "type": "function"
    },
    {
        "inputs": [
            {
                "name": "initMessage",
                "type": "string"
            }
        ],
        "payable": false,
        "stateMutability": "nonpayable",
        "type": "constructor"
    },
    {
        "constant": true,
        "inputs": [],
        "name": "message",
        "outputs": [
            {
                "name": "",
                "type": "string"
            }
        ],
        "payable": false,
        "stateMutability": "view",
        "type": "function"
    },
    {
        "constant": true,
        "inputs": [],
        "name": "viewMessage",
        "outputs": [
            {
                "name": "",
                "type": "string"
            }
        ],
        "payable": false,
        "stateMutability": "view",
        "type": "function"
    }
]
        var address = '0xeFd35a0c1b6B7dc083C290123f132C4A1477eBaA';
        async function init(){
            Contract = await new web3.eth.Contract(abi,address);

            Contract.methods.viewMessage().call()
            .then(function(data){
                document.getElementById('message').textContent = data;
            })


        }
        init();
        async function send(){
            var accounts = await web3.eth.getAccounts();
            var str = document.getElementById('editMessage').value;
            Contract.methods.editMessage(str)
            .send({from:accounts[0]})
            .then(function(data){
                console.log(data);
            })

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