call contract function signed on client side web3.js 1.0 [duplicate]

Question

I don't think the web3.js 1.0 docs cover this.

I found this post. but the answer seems outdated. How to properly create a raw transaction and sign it using web3 in browser

I'd like to use web3.js 1.0 the future is now.

what i have so far:

var web3 = new Web3('https://ropsten.infura.io/<top secret>');
var abi = <abi things>
var address = <contract address>
var myContract = new web3.eth.Contract(abi,address);
myContract.methods.getmessage().call().then(console.log);

Answer 1

You can do as follow in web3 1.0 as explained here

var Tx = require('ethereumjs-tx');
dataTx = myContract.methods.mymethod(params).encodeABI(); //The encoded ABI of the method

var rawTx = {
  to: 'yourcantract address', 
  data:dataTx 
}

var tx = new Tx(rawTx);
tx.sign('yourprivateKey');

var serializedTx = tx.serialize();
web3.eth.sendSignedTransaction('0x' + serializedTx.toString('hex'))
.on('receipt', console.log);