Ethereum Cookbook

How to do it...

In order to read data from smart contracts, we will have to perform these steps:

1. Create a contract instance with the ABI and the deployed address. If you are using web3.js v0.2x.x, use the following methods to create an instance:

// Create a contract objectvar MyContract = web3.eth.contract(<ABI>);

// Create an instance with address
var contractInstance = MyContract.at("<Address>");

For those who are using the upcoming version of web3js ( v1.x.x), use the following method to create an instance:

var contractInstance = new web3.eth.Contract(    "<ABI>",    "<Address>");

2. Read data from the smart contract using the call method. This executes the code in the Ethereum Virtual Machine (EVM) and returns the value. This method does not ...