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ballot.html
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<html>
<head>
<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/milligram/1.2.3/milligram.min.css">
</head>
<body class="container" style="padding-top: 3%;">
<h2><a href="index.html">ethjs</a></h2>
<h4>Ballot</h4>
<hr />
<div id="ballotCreation">
<h4>Add Proposals</h4>
<div id="inputProposals">
<input type="text" id="proposal_0_value" maxLength="64" placeholder="Proposal Name #0" />
<span id="proposal_0_next"></span> <!-- shim for adding -->
</div>
<button id="addProposal">Add Proposal</button>
<hr />
<button id="createBallot">Create Ballot</button>
<div id="ballotCreationResponse">
</div>
</div>
<div id="ballotActive" style="display: none;">
<div class="row">
<div class="column">
<label>Chairperson</label>
<p><span id="chairpersonAddress">0x</span>...</p>
</div>
<div class="column">
<label>Winning Proposal</label>
<p id="winningProposal">None</p>
</div>
<div class="column">
<label>Your Address</label>
<p><span id="accountAddress">0x</span>...</p>
</div>
<div class="column">
<label>Balance</label>
<p><span id="accountBalance">0</span> ether</p>
</div>
</div>
<hr />
<div class="row">
<div class="column column-50">
<h4>Proposals</h4>
<br />
<div id="proposals"></div>
</div>
<div class="column column-40 column-offset-10">
<h4>Manager</h4>
<br />
<label>Add Voter</label>
<input type="text" id="voterAddress" placeholder="0xcc136826fbd5192c10bba496af42906a7e3b91f8">
<button id="giveRightToVote">Give Right to Vote</button>
<hr />
<label>Delegate</label>
<input type="text" id="delegateAddress" placeholder="0xcc136826fbd5192c10bba496af42906a7e3b91f8">
<button id="delegateVote">Delegate My Vote</button>
</div>
</div>
<br />
<div id="ballotActiveResponse" style="padding: 20px; border: 1px solid #9b4dca;"></div>
</div>
<br /><br />
<script type="text/javascript" src="ethereumjs-testrpc.js"></script>
<script type="text/javascript" src="ethjs.js"></script>
<script type="text/javascript">
var eth = new Eth(TestRPC.provider());
var el = function(id){ return document.querySelector(id); };
/*
// uncomment to enable MetaMask support:
if (typeof window.web3 !== 'undefined' && typeof window.web3.currentProvider !== 'undefined') {
eth.setProvider(window.web3.currentProvider);
} else {
eth.setProvider(provider); // set to TestRPC if not available
}
*/
eth.accounts(function(accountsError, accounts){
el('#accountAddress').innerHTML = accounts[0].substr(0, 15);
// get the current account balance
eth.getBalance(accounts[0]).then(function(balance){
el('#accountBalance').innerHTML = Eth.fromWei(balance, 'ether');
});
// setup the bytecode and ABI for the ballot contract
var BallotBytecode = '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';
var BallotABI = [{"constant":false,"inputs":[{"name":"proposal","type":"uint256"}],"name":"vote","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"proposals","outputs":[{"name":"name","type":"bytes32"},{"name":"voteCount","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"chairperson","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"to","type":"address"}],"name":"delegate","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"winningProposal","outputs":[{"name":"winningProposal","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"voter","type":"address"}],"name":"giveRightToVote","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"voters","outputs":[{"name":"weight","type":"uint256"},{"name":"voted","type":"bool"},{"name":"delegate","type":"address"},{"name":"vote","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"winnerName","outputs":[{"name":"winnerName","type":"bytes32"}],"payable":false,"type":"function"},{"inputs":[{"name":"proposalNames","type":"bytes32[]"}],"payable":false,"type":"constructor"}];
var Ballot = eth.contract(BallotABI, BallotBytecode, { from: accounts[0], gas: 3000000 });
var ballotInstance = null;
var inputProposals = 0;
// the add proposal button
el('#addProposal').addEventListener('click', function(){
inputProposals += 1;
el('#proposal_' + (inputProposals - 1) + '_next')
.innerHTML += '<input type="text" id="proposal_'
+ inputProposals
+ '_value" maxLength="64" placeholder="Proposal Name #'
+ inputProposals + '" />'
+ '<span id="proposal_' + inputProposals + '_next"></span>';
});
// the create ballot button
el('#createBallot').addEventListener('click', function(){
var proposalNames = [];
// draw the proposals submitted
for(var proposalID = 0; proposalID <= inputProposals; proposalID++) {
proposalNames.push(Eth.fromUtf8(el('#proposal_' + proposalID + '_value').value));
el('#proposals').innerHTML += '<h5>#' + proposalID + ' '
+ el('#proposal_' + proposalID + '_value').value
+ ' <button data-id="' + proposalID + '" class="float-right voteForProposal">'
+ 'Vote</button><hr /></h5>';
}
// delegate the vote to another person
el('#delegateVote').addEventListener('click', function(){
el('#ballotActiveResponse').innerHTML = 'Delegating vote..';
ballotInstance.delegate(el('#delegateAddress').value)
.then(function(delegateTxHash){
el('#ballotActiveResponse').innerHTML = 'Delegating vote with TxHash: ' + delegateTxHash;
})
.catch(function(delegateError){
el('#ballotActiveResponse').innerHTML = 'There was an error ' + String(delegateError);
});
});
// give another right to vote
el('#giveRightToVote').addEventListener('click', function(){
el('#ballotActiveResponse').innerHTML = 'Giving right to vote...';
ballotInstance.giveRightToVote(el('#voterAddress').value)
.then(function(rightToVoteTxHash){
el('#ballotActiveResponse').innerHTML = 'Giving right to vote with TxHash: ' + rightToVoteTxHash;
})
.catch(function(rightToVoteError){
el('#ballotActiveResponse').innerHTML = 'There was an error ' + String(rightToVoteError);
});
});
// vote for a specific proposal
document.querySelectorAll(".voteForProposal").forEach(function(elVoteFor){
elVoteFor.addEventListener('click', function(evt){
ballotInstance.vote(evt.target.dataset.id, function(voteError, voteResult){
if (voteError) {
el('#ballotActiveResponse').innerHTML = 'There was an error: ' + String(voteError);
}
el('#ballotActiveResponse').innerHTML = 'Voting with tx hash: ' + String(voteResult);
document.querySelectorAll(".voteForProposal").forEach(function(elVoteFor){
elVoteFor.disabled = 'disabled';
});
});
});
});
// create a new ballot contract
Ballot.new(proposalNames, function(ballotError, ballotTxHash){
if (ballotError) {
el('#ballotCreationResponse').innerHTML = 'Hmm.. there was an error'
+ String(ballotError);
}
// poll for new ballot interval
var ballotInterval = setInterval(function(){
eth.getTransactionReceipt(ballotTxHash).then(function(receipt){
if (receipt) {
clearInterval(ballotInterval);
ballotInstance = Ballot.at(receipt.contractAddress);
el('#ballotCreation').style.display = 'none';
el('#ballotActive').style.display = 'block';
// get the chairperson data
ballotInstance.chairperson().then(function(chairAddress){
el('#chairpersonAddress').innerHTML = chairAddress[0].substr(0, 15);
});
// poll for latest winner name
setInterval(function(){
ballotInstance.winnerName().then(function(proposalName){
el('#winningProposal').innerHTML = Eth.toUtf8(proposalName[0]);
});
}, 400);
}
});
}, 400);
});
});
});
</script>
<pre><code>
pragma solidity ^0.4.4;
contract Ballot {
struct Voter {
uint weight; // weight is accumulated by delegation
bool voted; // if true, that person already voted
address delegate; // person delegated to
uint vote; // index of the voted proposal
}
struct Proposal
{
bytes32 name; // short name (up to 32 bytes)
uint voteCount; // number of accumulated votes
}
address public chairperson;
mapping(address => Voter) public voters;
Proposal[] public proposals;
function Ballot(bytes32[] proposalNames) {
chairperson = msg.sender;
voters[chairperson].weight = 1;
for (uint i = 0; i < proposalNames.length; i++) {
proposals.push(Proposal({
name: proposalNames[i],
voteCount: 0
}));
}
}
function giveRightToVote(address voter) {
if (msg.sender != chairperson || voters[voter].voted) {
throw;
}
voters[voter].weight = 1;
}
function delegate(address to) {
Voter sender = voters[msg.sender];
if (sender.voted)
throw;
while (
voters[to].delegate != address(0) &&
voters[to].delegate != msg.sender
) {
to = voters[to].delegate;
}
if (to == msg.sender) {
throw;
}
sender.voted = true;
sender.delegate = to;
Voter delegate = voters[to];
if (delegate.voted) {
proposals[delegate.vote].voteCount += sender.weight;
} else {
delegate.weight += sender.weight;
}
}
function vote(uint proposal) {
Voter sender = voters[msg.sender];
if (sender.voted)
throw;
sender.voted = true;
sender.vote = proposal;
proposals[proposal].voteCount += sender.weight;
}
function winningProposal() constant
returns (uint winningProposal)
{
uint winningVoteCount = 0;
for (uint p = 0; p < proposals.length; p++) {
if (proposals[p].voteCount > winningVoteCount) {
winningVoteCount = proposals[p].voteCount;
winningProposal = p;
}
}
}
function winnerName() constant
returns (bytes32 winnerName)
{
winnerName = proposals[winningProposal()].name;
}
}
</code></pre>
</body>
</html>