Full stack hello world voting ethereum dapp

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Here is the function to buy tokens. Note the keyword 'payable' below. By just adding that one keyword to a function, your contract can now accept Ether from anyone who calls this function. Accepting money can not get any easier than this! Assuming the value of each token to be 0. As you can see in the contract file on github , the rest of the new methods in the contract are mostly getters and should be easy to follow along. The index. There is a new section where you can purchase tokens.

You can now look up voter information — how many tokens they own and no. The candidates are not hardcoded anymore. We fetch the candidates from the blockchain and populate it. The app. Update the deployment file 2deploycontracts. Once you have updated your truffle repository with these files, we can deploy the contract to the blockchain. The deploy process is exactly the same as the previous tutorial. You just have to compile and migrate using truffle command.

Compiling Migrations. Compiling Voting. Writing artifacts to. Migrations: 0xcb8a3b1defbf7f Saving successful migration to network Saving artifacts Voting: 0xd6d1f7cff27eda5f1ebd5bbd0a8df Saving successful migration to network Now that we have initialized the tokens and set the price, let's see how someone could purchase these tokens by paying ether.

Here is the function to buy tokens. Note the keyword 'payable' below. By just adding that one keyword to a function, your contract can now accept Ether from anyone who calls this function. Accepting money can not get any easier than this! Assuming the value of each token to be 0. Let's take a break from looking at the code for a moment and visualize the interaction between accounts voters and the contract. As you can see in the contract file on github , the rest of the new methods in the contract are mostly getters and should be easy to follow along.

The index. There is a new section where you can purchase tokens. You can now look up voter information — how many tokens they own and no. The candidates are not hardcoded anymore. We fetch the candidates from the blockchain and populate it.

The app. Once you have updated your truffle repository with these files, we can deploy the contract to the blockchain. The deploy process is exactly the same as the previous tutorial. You just have to compile and migrate using truffle command. Compiling Voting. Writing artifacts to.

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I have deliberately avoided using any dapp frameworks to build this application because the frameworks abstract away lot of the details and you fail to understand the internals of the system. Also, when you do use a framework, you will have more appreciation for all the heavy lifting the framework does for you! In lot of ways, this article is a continuation of the previous post. If you are new to the world of Ethereum, I recommend reading it before continuing.

The goal of this exercise is to: Set up the development environment. Learn the process of writing a contract, compiling it and deploying it in your development environment. Interact with the contract on the blockchain through a nodejs console. Interact with the contract through a simple web page to display the vote counts and vote for candidates through the page.

The entire application set up and build was done on a fresh installation of ubuntu I have set up and tested the application on macos as well. This is how I would visualize this application we are going to build. Setting up the development environment Instead of developing the app against the live blockchain, we will use an in- memory blockchain think of it as a blockchain simulator called ganache.

In Part 2 of the tutorial, we will interact with the real blockchain. Below are the steps to install ganache, web3js and start the test blockchain on a linux operating system. The exact same instructions work on macos as well. For windows, you can follow the instructions here Thanks Prateesh! Note: This tutorial currently works with web3js version 0. I will update the tutorial once web3js 1. These accounts come preloaded with fake ethers.

Simple voting contract We are going to use the solidity programming language to write our contract. If you are familiar with object oriented programming, learning to write solidity contracts should be a breeze. We will write a contract think of contract as a class in your favorite OOP language called Voting with a constructor which initializes an array of candidates.

We will write 2 methods, one to return the total votes a candidate has received and another method to increment vote count for a candidate. Note: The constructor is invoked once and only once when you deploy the contract to the blockchain.

Every time this voter votes with her tokens, the value at that index is incremented. Example, if candidateList array declared below has ["Rama", "Nick", "Jose"] and this voter votes 10 tokens to Nick, the tokensUsedPerCandidate[1] will be incremented by Remember that the constructor is invoked just once when the contract is deployed on the blockchain.

Here, we also have to initialize the contract with total number of tokens available for sale and the cost of each token. You can take a peek at a migration file here. An example deploy call in truffle migration file looks like this: deployer. Here is the function to buy tokens. Note the keyword 'payable' below. By just adding that one keyword to a function, your contract can now accept Ether from anyone who calls this function. Accepting money can not get any easier than this!

Assuming the value of each token to be 0. As you can see in the contract file on github , the rest of the new methods in the contract are mostly getters and should be easy to follow along. The index. There is a new section where you can purchase tokens. You can now look up voter information — how many tokens they own and no. The candidates are not hardcoded anymore. We fetch the candidates from the blockchain and populate it. The app. Update the deployment file 2deploycontracts.

Once you have updated your truffle repository with these files, we can deploy the contract to the blockchain. The deploy process is exactly the same as the previous tutorial. You just have to compile and migrate using truffle command.