[Ethereum] How to set the smart contract function argument in web3 object

Thank you to Gawey in the comments for the answer. The problem was that I used the wrong ABI to create the contract object while in the JavaScript console. To get the correct ABI, I went into the file Truffle created of the compiled contract and copied the ABI from there. To get the incorrect ABI, I had used the Truffle console and typed contractName.ABI, which gave me all of the contract's functions, however, that ABI didn't specify each function's inputs and outputs, which resulted in the TypeError.

bytes-x(1~32) can store a string, if the length of string is greater than x, then the part out of length will be dropped. It's a simple test contract

pragma solidity ^0.4.13;

contract Bytes32Test {

    bytes32 msg;

    function add(bytes32 _msg){
        msg = _msg;
    }

    function show() constant returns (bytes32){
        return msg;
    }

}

and i invoke add function by a param 'some string over 32 characters in length that can seem to be up to 128 characters in length to be stored in bytes32', and now we call show function, the result is

0x736f6d6520737472696e67206f76657220333220636861726163746572732069

the result is "some string over 32 characters i" if we convert it from hex to ascii.

> web3.toAscii("0x736f6d6520737472696e67206f76657220333220636861726163746572732069")
"some string over 32 characters i"

Hope it helps~