web3.js/example/contract.html

80 lines
2.5 KiB
HTML

<!doctype>
<html>
<head>
<script type="text/javascript" src="../dist/web3.js"></script>
<script type="text/javascript">
var web3 = require('web3');
web3.setProvider(new web3.providers.HttpProvider("http://localhost:8545"));
// solidity code code
var source = "" +
"contract test {\n" +
" function multiply(uint a) constant returns(uint d) {\n" +
" return a * 7;\n" +
" }\n" +
"}\n";
var compiled = web3.eth.compile.solidity(source);
var code = compiled.test.code;
// contract json abi, this is autogenerated using solc CLI
var abi = compiled.test.info.abiDefinition;
var myContract;
function createExampleContract() {
// hide create button
document.getElementById('create').style.visibility = 'hidden';
document.getElementById('code').innerText = code;
// let's assume that coinbase is our account
web3.eth.defaultAccount = web3.eth.coinbase;
var watch = web3.eth.filter('latest');
// create contract
myContract = web3.eth.contract(abi).new({data: code});
console.log('address: ' + myContract.address);
document.getElementById('status').innerText = "transaction sent, waiting for confirmation";
watch.watch(function (err, hash) {
var block = web3.eth.getBlock(hash, true);
var contractMined = block.transactions.reduce(function (mined, th) {
// TODO: compiled code do not have 0x prefix
return mined || (th.from === web3.eth.defaultAccount && th.input.indexOf(code) !== -1);
}, false);
if (contractMined) {
document.getElementById('status').innerText = 'Mined!';
document.getElementById('call').style.visibility = 'visible';
}
});
}
function callExampleContract() {
// this should be generated by ethereum
var param = parseInt(document.getElementById('value').value);
// call the contract
var res = myContract.multiply(param);
document.getElementById('result').innerText = res.toString(10);
}
</script>
</head>
<body>
<h1>contract</h1>
<div id="code"></div>
<div id="status"></div>
<div id='create'>
<button type="button" onClick="createExampleContract();">create example contract</button>
</div>
<div id='call' style='visibility: hidden;'>
<input type="number" id="value" onkeyup='callExampleContract()'></input>
</div>
<div id="result"></div>
</body>
</html>