I have deployed a contract to testnet which appears to function.

I have a function named contribute which gets the ether from the msg.value. The function is below and doesn't take any arguments.

I call contribute from JavaScript like this:

var res = contracts['CrowdFunder'].contract.contribute();

How do I specify ether to be sent when calling contribute?

Here is contribute which expects msg.value

function contribute() public      
                amount: msg.value,
                contributor: msg.sender
        totalRaised += msg.value;             

1 Answer 1


You pass in an object with a property named value and the amount of wei.

Using your example, like:

contracts['CrowdFunder'].contract.contribute({value: web3.toWei(12, 'ether')});

Note, in your example res will be a transaction hash.

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