How to interact with a contract function through another contract?

Question

I have this function on my MultiSigWallet

function submitTransaction(address destination, uint value, bytes data)
    public
    returns (uint transactionId)
{
    transactionId = addTransaction(destination, value, data);
    confirmTransaction(transactionId);
}

I want to use this to send a transaction to another contract and interface with a function. How do I prepare the data field ahead of time to make sure it works?

The idea behind this, is I want to have children contracts owned by this MultiSigWallet where I submit transactions to interact with the child contract which need approval by signers of the multisig.

Answer 1

Figured out how to do it!

Using web3 and having the contract ABI.

var MyContract = web3.eth.contract(abi);

var myCallData = myContractInstance.myMethod.getData(param1 [, param2, ...]);

You can then use the myCallData as a parameter passed to the submitTransaction function on the multisig contract.