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demo.html
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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">
<meta name="author" content="Kenneth Hu">
<title>Web3jsdemo</title>
<link rel="stylesheet" type="text/css" href="css/main.css">
</head>
<body>
<div class="container">
<h1>Web3jsdemo</h1>
<label for="name"><h3>node info</h3></label>
Connect nodes : <input id="NodeInfo" type="text" disabled>
<hr>
<label for="name"><h3>account information</h3></label>
<p>account info : <input id="Account" type="text"> </p>
<p>account balance : <input id="Balance" type="text" disabled></p>
<button id="checkBalance">Check balances</button>
<hr>
<label for="name"><h3>transfer</h3></label>
<p>From address : <input id="From" type="text"> Default is the account address found above</p>
<p>To address : <input id="To" type="text" value="0xbb44a15462C5c5042A74b4Adc770793A7E57210a"> 默认我的账户地址</p>
<p>Amount : <input id="Amount" type="text"> uint:Ether</p>
<p>Hash : <span id="Tx"></span></p>
<button id="Transfer">Transfer</button>
<hr>
<label for="name"><h3>Contract</h3></label>
<p>Contract code : <textarea id="code" disabled>
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;
/// @dev Test contract
contract TestContract {
// State variables - messages
string message;
/// @dev Constructor - initialization message
constructor() {
message = "Hello World!";
}
/// @dev Query message
function getMsg() external view returns (string memory) {
return message;
}
/// @dev Set message
function setMsg(string memory _msg) external {
message = _msg;
}
}</textarea></p>
<p>Contract ABI : <textarea id="abi" disabled>[
{
"inputs": [
{
"internalType": "string",
"name": "_msg",
"type": "string"
}
],
"name": "setMsg",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [],
"stateMutability": "nonpayable",
"type": "constructor"
},
{
"inputs": [],
"name": "getMsg",
"outputs": [
{
"internalType": "string",
"name": "",
"type": "string"
}
],
"stateMutability": "view",
"type": "function"
}
]</textarea></p>
<p>Contract Deploy : redbellynetwork Test Network </p>
<p>Contract Address : <input id="address" type="text" value="0x13CCB62EaE384fbcAacA1c24b58ac27f49D717cD" disabled> </p>
<p>Call Contract - query : <input id="getMsg" type="text" disabled><button id="GetMsg">query</button></p>
<p>Call Contract - set : <input id="setMsg" type="text">
<p>Hash : <span id="TxContract"></span></p>
<button id="SetMsg">set</button></p>
</div>
<script src="js/web3.min.js"></script>
<script src="js/jquery-3.2.1.slim.min.js"></script>
<script src="js/jquery-3.3.1.min.js"></script>
<script>
$( document ).ready(function() {
console.log( "ready!" );
console.log("window.ethereum===",window.ethereum)
//判断是否支持浏览器钱包
if (!window.ethereum) {
alert("没有浏览器钱包，请先下载浏览器钱包");
return false;
}
// 获取服务提供器，若没有，则可设置成自己的服务提供器
if (typeof web3 !== 'undefined') {
web3 = new Web3(web3.currentProvider);
} else {
web3 = new Web3(new Web3.providers.HttpProvider("https://192.168.237.110:8545"));
}
/* 节点信息 - 提前加载 */
web3.eth.getNodeInfo(function(error, result){
if(error){
console.log( "error" ,error);
}
else{
$('#NodeInfo').val(result);
}
});
/* 账户信息 - 提前加载*/
web3.eth.getAccounts(function(error, accounts) {
if(error) {
console.log(error);
} else {
$('#Account').val(accounts[0]);
$('#From').val(accounts[0]);
web3.eth.getBalance(accounts[0]).then(function(result){
$('#Balance').val(web3.utils.fromWei(result, 'ether'));
});
}
});
/* 事件 - 查询账户余额 */
$('#checkBalance').click(function() {
var _account = $('#Account').val();
if (_account == "") {
alert("请输入账户地址");
return;
}
web3.eth.getBalance(_account).then(function(result){
$('#Balance').val(web3.utils.fromWei(result, 'ether'));
});
});
/* 事件 - 转账 */
$('#Transfer').click(function() {
$('#Tx').text('');
var _from = $('#From').val();
var _to = $('#To').val();
var _Amount = $('#Amount').val();
if (_from == "") {
alert("请入输入账户地址");
return;
}
if (_to == "") {
alert("请入输出账户地址");
return;
}
if (_Amount == "") {
alert("请入输入转账金额");
return;
}
var txnObject = {
"from":_from,
"to": _to,
"value": web3.utils.toWei(_Amount,'ether'),
"gas": 3000000, // (可选)
// "gasPrice": 4500000, (可选)
// "data": 'For testing' (可选)
// "nonce": 10 (可选)
}
web3.eth.sendTransaction(txnObject, function(error, result){
if(error){
alert("转账失败，错误信息：" + error.message);
}
else{
//显示生成的交易hash
var txn_hash = result;
$('#Tx').text(txn_hash);
}
});
});
/* 合约 */
// 合约地址
var address = $("#address").val();
// 合约ABI
var abi = $("#abi").val();
abi = JSON.parse(abi);
// 创建合约对象
var myContract = new web3.eth.Contract(abi, address);
// 显示消息
function getMsg() {
myContract.methods.getMsg().call().then(function(msg){
$("#getMsg").val(msg);
});
}
// 显示消息 - 提前显示
getMsg();
/* 事件 - 查询消息 */
$("#GetMsg").click(function() {
getMsg();
});
/* 事件 - 设置消息 */
$("#SetMsg").click(function() {
var newMsg = $("#setMsg").val();
if (newMsg == "") {
alert("请输入要设置的消息");
return;
}
const sendFunc = async () => {
try {
const accounts = await web3.eth.getAccounts();
//调用合约函数
myContract.methods.setMsg(newMsg).send({
from: accounts[0],
gas: 3000000
}).on("transactionHash", function(hash){
// 显示交易Hash
$('#TxContract').text(hash);
}).on("receipt", function(receipt) {
console.log("receipt==", receipt);
if (receipt.status) {
alert("设置成功");
} else {
alert("设置失败");
}
}).on("error", function(error) {
alert("交易发生错误：" + error);
});
return accounts;
} catch (err) {
console.log(err);
}
}
sendFunc();
});
});
</script>
</body>
</html>