如何收听 Metamask 的 web3 的“确认”/“取消”合同事件？

Question

Since metamask's injected web3 follows https://github.com/ethereum/wiki/wiki/JavaScript-API

But there seems to be no coding to catch the confirm/cancel button clicking event (img below) when calling contract.new()

Is there a way to catch the event? thanks.

Answer 1

Found an answer myself

if the user clicked the 'cancel' button, the 'processedContract' variable below will be undefined. If confirmed, it will be the contract and if it has an address ( processedContract.address ) then it is being mined.

newContract.new({...}, function(e, processedContract) {...});

Answer 2

To handle Confirm/Cancel response of user on your contract functions, you can use the transactionHash event & error event from send function.

"transactionHash" returns transactionHash: String: Fired when the transaction hash is available.

"error" returns error: Error: Fired if an error occurs during sending. If the transaction was rejected by the network with a receipt, the receipt will be available as a property on the error object.

You can see detail here.

When you click on Confirm button then you can handle this case in the transactionHash event.

When you click on Cancel button then you can handle this case in the error event.