Let's learn how to deploy a new contract, get a reference to a deployed contract using it's address, send ether to a contract, send a transaction to invoke a contract method, and estimate the gas of a method call.
To deploy a new contract or to get a reference to an already deployed contract, you need to first create a contract object using the web3.eth.contract() method. It takes the contract ABI as an argument and returns the contract object.
Here is the code to create a contract object:
var proofContract = web3.eth.contract([{"constant":false,"inputs":[{"name":"fileHash","type":"string"}],"name":"get","outputs":[{"name":"timestamp","type":"uint256"},{"name":"owner","type":"string"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"owner","type":"string"},{"name":"fileHash","type":"string"}],"name":"set","outputs":[],"payable":false,"type":"function"},{"anonymous":false,"inputs":[{"indexed":false,"name":"status","type":"bool"},{"indexed":false,"name":"timestamp","type":"uint256"},{"indexed":false,"name":"owner","type":"string"},{"indexed":false,"name":"fileHash","type":"string"}],"name":"logFileAddedStatus","type":"event"}]); ...
