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index.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">
<title>Course</title>
<link rel="stylesheet" href="main.css">
<script src="./node_modules/web3/dist/web3.min.js"></script>
</head>
<body>
<div class="container">
<h1>Course Instructor</h1>
<h2 id="instructor"></h2>
<img id="loader" src="https://loading.io/spinners/double-ring/lg.double-ring-spinner.gif" alt="spinner" />
<label for="name" class="col-lg-2 control-label">Instructor Name</label>
<input type="text" id="name" />
<label for="age" class="col-lg-2 control-label">Instructor Age</label>
<input type="text" id="age" />
<button id="button">Update Instructor</button>
</div>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<script>
// Connect to our Solidty counterpart
if (typeof web3 !== 'undefined') {
web3 = new Web3(web3.currentProvider);
} else {
// Set the provider you want from Web3.provider
web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
}
web3.eth.defaultAccount = web3.eth.accounts[2];
var CourseContract = web3.eth.contract([
{
"anonymous": false,
"inputs": [
{
"indexed": false,
"name": "name",
"type": "string"
},
{
"indexed": false,
"name": "age",
"type": "uint256"
}
],
"name": "Instructor",
"type": "event"
},
{
"constant": false,
"inputs": [
{
"name": "_fName",
"type": "string"
},
{
"name": "_age",
"type": "uint256"
}
],
"name": "setInstructor",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "constructor"
},
{
"constant": true,
"inputs": [],
"name": "getInstructor",
"outputs": [
{
"name": "",
"type": "string"
},
{
"name": "",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
}
]);
var Course = CourseContract.at("0xf911ba011d38850d2da7541d1a7b74a5151e8467");
var instructorEvent = Course.Instructor();
instructorEvent.watch(function(error, result) {
if (!error) {
$('#loader').hide();
$("#instructor").html(result.args.name + " (" + result.args.age + " years old)");
} else {
$("#loader").hide();
console.error(error);
}
});
$('#button').click(function() {
$("#loader").show();
Course.setInstructor($("#name").val(), $("#age").val(), (err, res) => {
if (err) {
$('#loader').hide();
}
});
});
</script>
</body>
</html>