How to connect javascript to solidity ethereum

Question

i want to link connect javascript to solidity/ethereum to send some data or signals.. How can i do that?

Answer 1

You can connect javascript to solidity by using web3.. To know more visit: https://github.com/ethereum/wiki/wiki/JavaScript-API

you should use different syntax depending on whether the contract has already been deployed or not.. you can call the contract methods when you have contract instances:

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