Link Javascript to Solidity?

Question

Is it possible to link/connect/ send a signal from JavaScript code into Solidity/Ethereum?

Answer 1

You can use web3.

There is a different syntax for interfacing with contracts. Depending on if the contract is already deployed or you need to do that yourself.

When you have the contract instance you can then call contract methods.

const ChessGame = web3.eth.contract(abiArray);
const contractInstance = ChessGame.at(address);
contractInstance.declareWinner(winner, function (err, res) {
  // do something
});

I personally think web3 is a little cumbersome. I recommend checking out Truffle and following some of their tutorials to get up to speed.