what happens when require() is false

Question

From what I under stands when the condition in require() is not met solidity performs revert operation. Right?

What I want to know is how can we handle this in web3. That is if i have a function in my contract, say getbalance, and I am calling this function from web3, and that it checks whether the caller is the owner of that contract.

contract myContract{
  .......
  function getbalance() public constant returns(address){
      require(msg.sender==owner);
       .....
  }
 }

what I am asking is if the require() function false, i.e. caller of the function is not the owner, what should I do in my web3 to handle it?

Answer 1

There's no way to handle reverts on the front-end. You will need to do the checking client-side to prevent such cases from happening if you want to have an acceptable user experience. In this case, it would mean disabling the button if the current account is not the owner of the contract so it can't ever be called.