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‎.ipynb_checkpoints/Untitled-checkpoint.ipynb

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{
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"cells": [],
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"metadata": {},
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"nbformat": 4,
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"nbformat_minor": 0
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}

‎README.md

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# Build your First Decentralized Application (DApp) Tutorial
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A quick tutorial to get your first DApp up and running without any frameworks!
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By Ben Stewart <br/>
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Last Updated:2/18/2018 <br/>
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Install Dependencies:
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1. ganache-cli ```npm install ganache-cli [email protected]```
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2. solc ```npm install solc```
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Directions:
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1. Git Clone this repository
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2. Run ganache-cli ```node_modules/.bin/ganace-cli```
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3. Open up Nodejs console ```node```
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4. Compile the contract
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* ```code = fs.readFileSync('Voting.sol').toString()```
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* ```solc = require('solc')```
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* ```compiledCode = solc.compile(code)```
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5. Deploy the contract
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* ```abiDefinition = JSON.parse(compiledCode.contracts[':Voting'].interface)```
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* ```VotingContract = web3.eth.contract(abiDefinition)```
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* ```byteCode = compiledCode.contracts[':Voting'].bytecode```
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* ```deployedContract = VotingContract.new(['Rama','Nick','Jose'],{data: byteCode, from: web3.eth.accounts[0], gas: 4700000})```
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* ```deployedContract.address```
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* ```contractInstance = VotingContract.at(deployedContract.address)```
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Interacting with contract through nodejs console
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```
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> contractInstance.totalVotesFor.call('Rama')
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Output: { [String: '0'] s: 1, e: 0, c: [ 0 ] }
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> contractInstance.voteForCandidate('Rama', {from: web3.eth.accounts[0]})
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Output: '0xdedc7ae544c3dde74ab5a0b07422c5a51b5240603d31074f5b75c0ebc786bf53'
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> contractInstance.voteForCandidate('Rama', {from: web3.eth.accounts[0]})
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Output: '0x02c054d238038d68b65d55770fabfca592a5cf6590229ab91bbe7cd72da46de9'
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> contractInstance.voteForCandidate('Rama', {from: web3.eth.accounts[0]})
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Output: '0x3da069a09577514f2baaa11bc3015a16edf26aad28dffbcd126bde2e71f2b76f'
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> contractInstance.totalVotesFor.call('Rama').toLocaleString()
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Output: '3'
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```
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Interacting with contract via front GUI
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1. Update the contract instance address in index.js
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* Can run command ```contractInstance.address``` to find address
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2. Open index.html in your browser
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# voting-blockchain-dapp

‎index.html

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<!DOCTYPE html>
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<html>
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<head>
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<title>Hello World</title>
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<link href='https://fonts.googleapis.com/css?family=Open+Sans:400,700' rel='stylesheet' type='text/css'>
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<link href='https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css' rel='stylesheet' type='text/css'>
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</head>
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<body class="container">
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<h1>A Simple Blockchain Voting Application</h1>
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<div class="table-responsive">
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<table class="table table-bordered">
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<thead>
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<tr>
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<th>Candidate</th>
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<th>Votes</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>Bill</td>
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<td id="candidate-1"></td>
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</tr>
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<tr>
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<td>Bob</td>
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<td id="candidate-2"></td>
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</tr>
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</tbody>
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</table>
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</div>
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<input type="text" id="candidate" />
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<a href="#" onclick="votesForTeam()" class="btn btn-primary">Votes</a>
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</body>
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<script src="https://cdn.rawgit.com/ethereum/web3.js/develop/dist/web3.js"></script>
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<script src="https://code.jquery.com/jquery-3.1.1.slim.min.js"></script>
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<script src="./index.js"></script>

‎index.js

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web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
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abi = JSON.parse('[{"constant":false,"inputs":[{"name":"candidate","type":"bytes32"}],"name":"totalVotesFor","outputs":[{"name":"","type":"uint8"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"candidate","type":"bytes32"}],"name":"validCandidate","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"votesReceived","outputs":[{"name":"","type":"uint8"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"x","type":"bytes32"}],"name":"bytes32ToString","outputs":[{"name":"","type":"string"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"candidateList","outputs":[{"name":"","type":"bytes32"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"candidate","type":"bytes32"}],"name":"voteForCandidate","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"contractOwner","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"inputs":[{"name":"candidateNames","type":"bytes32[]"}],"payable":false,"type":"constructor"}]')
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VotingContract = web3.eth.contract(abi);
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// In your nodejs console, execute contractInstance.address to get the address at which the contract is deployed and change the line below to use your deployed address
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contractInstance = ScoringContract.at('0x8673fb2ae00895efd903c489b18231b1365b8b39');
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teams = {"Los Angeles Lakers": "team-1", "New York Knicks": "team-2"}
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function pointForTeam() {
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candidateName = $("#team").val();
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contractInstance.pointForTeam(teamName, {from: web3.eth.accounts[0]}, function() {
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let div_id = teams[teamName];
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$("#" + div_id).html(contractInstance.totalPointsFor.call(teamName).toString());
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});
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}
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$(document).ready(function() {
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teamNames = Object.keys(team);
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for (var i = 0; i < teamNames.length; i++) {
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let name = teamNames[i];
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let val = contractInstance.totalPointsFor.call(name).toString()
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$("#" + teams[name]).html(val);
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}
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});

‎node_modules/.bin/acorn

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‎node_modules/.bin/errno

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‎node_modules/.bin/ganache-cli

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‎node_modules/.bin/json5

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‎node_modules/.bin/miller-rabin

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‎node_modules/.bin/mkdirp

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‎node_modules/.bin/rimraf

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‎node_modules/.bin/semver

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‎node_modules/.bin/sha.js

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‎node_modules/.bin/solcjs

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‎node_modules/.bin/uglifyjs

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‎node_modules/.bin/webpack

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‎node_modules/.bin/which

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‎node_modules/acorn-dynamic-import/CHANGELOG.md

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‎node_modules/acorn-dynamic-import/LICENSE

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‎node_modules/acorn-dynamic-import/README.md

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‎node_modules/acorn-dynamic-import/lib/index.js

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‎node_modules/acorn-dynamic-import/lib/inject.js

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‎node_modules/acorn-dynamic-import/node_modules/.bin/acorn

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‎node_modules/acorn-dynamic-import/node_modules/acorn/.npmignore

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