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December 7, 2021 21:07
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Html file to cast and display votes
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Hello World DApp</title> | |
| <link href='https://fonts.googleapis.com/css?family=Open Sans:400,700' rel='stylesheet' type='text/css'> | |
| <link href='https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css' rel='stylesheet' type='text/css'> | |
| </head> | |
| <body class="container"> | |
| <h1>A Simple Hello World Voting Application</h1> | |
| <div class="table-responsive"> | |
| <table class="table table-bordered"> | |
| <thead> | |
| <tr> | |
| <th>Candidate</th> | |
| <th>Votes</th> | |
| </tr> | |
| </thead> | |
| <tbody> | |
| <tr> | |
| <td>Rama</td> | |
| <td id="candidate-1"></td> | |
| </tr> | |
| <tr> | |
| <td>Nick</td> | |
| <td id="candidate-2"></td> | |
| </tr> | |
| <tr> | |
| <td>Jose</td> | |
| <td id="candidate-3"></td> | |
| </tr> | |
| </tbody> | |
| </table> | |
| </div> | |
| <input type="text" id="candidate" /> | |
| <a href="#" onclick="voteForCandidate()" class="btn btn-primary">Vote</a> | |
| </body> | |
| <script src="https://cdn.jsdelivr.net/gh/ethereum/web3.js@1.0.0-beta.37/dist/web3.min.js"></script> | |
| <script src="https://code.jquery.com/jquery-3.1.1.slim.min.js"></script> | |
| <script src="./index.js"></script> | |
| </html> | |
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| web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545")) | |
| var account; | |
| web3.eth.getAccounts().then((f) => { | |
| account = f[0]; | |
| }) | |
| abi = JSON.parse('[{"constant":true,"inputs":[{"name":"candidate","type":"bytes32"}],"name":"totalVotesFor","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"candidate","type":"bytes32"}],"name":"validCandidate","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"votesReceived","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"candidateList","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"candidate","type":"bytes32"}],"name":"voteForCandidate","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[{"name":"candidateNames","type":"bytes32[]"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"}]') | |
| contract = new web3.eth.Contract(abi); | |
| contract.options.address = "0x71789831d83d4C8325b324eA9B5fFB27525480b5"; | |
| // update this contract address with your contract address | |
| candidates = {"Rama": "candidate-1", "Nick": "candidate-2", "Jose": "candidate-3"} | |
| function voteForCandidate(candidate) { | |
| candidateName = $("#candidate").val(); | |
| console.log(candidateName); | |
| contract.methods.voteForCandidate(web3.utils.asciiToHex(candidateName)).send({from: account}).then((f) => { | |
| let div_id = candidates[candidateName]; | |
| contract.methods.totalVotesFor(web3.utils.asciiToHex(candidateName)).call().then((f) => { | |
| $("#" + div_id).html(f); | |
| }) | |
| }) | |
| } | |
| $(document).ready(function() { | |
| candidateNames = Object.keys(candidates); | |
| for(var i=0; i<candidateNames.length; i++) { | |
| let name = candidateNames[i]; | |
| contract.methods.totalVotesFor(web3.utils.asciiToHex(name)).call().then((f) => { | |
| $("#" + candidates[name]).html(f); | |
| }) | |
| } | |
| }); |
You can see part 3, we do that there :)
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In the code you have:
candidates = {"Rama": "candidate-1", "Nick": "candidate-2", "Jose": "candidate-3"}I was wondering what would be a way to fetch the list of candidates directly from the blockchain.
Thanks