Metamask: Rejecting the transaction doesn’t catch the error in try-catch block

I can help you. Before I answer, though, I need to clarify a few things.

Metamask Errors in Try-Catch Blocks

When using Metamask, it is very important to handle errors properly so that your application does not crash or fail unexpectedly. One common issue is when a user rejects an Ethereum transaction, which can cause the try-catch block to run, but the error is not logged.

Here is an article that discusses how to reject Metamask test block transactions:

Rejecting Operations in Try-Catch Blocks: A Guide

When using Metamask for your Dapp, you may encounter errors when interacting with Ethereum. One common issue is when a user rejects an operation, which can cause the try-catch block to block, but does not receive an error.

In this article, we will explore how to reject transactions in Metamask test blocks, and provide best practices for resolving the error.

Problem: Transaction Rejection

When using Metamask to interact with Ethereum, it is possible that the user may reject the transaction. This may cause the try-catch block to run, but the error will not be caught.

For example:

import React, {
create context,
useContext,
use effect,
useRef,
useState,
} from 'react';
const Metamask = () => {
const [account, setAccount] = useState(null);
const context = createContext();
useEffect(() => {
const metamaskContext = useContext(context);
const accounts = metamaskContext.accounts;
if (accounts.length > 0) {
setAccount(accounts[0]);
}
}, []);
const handleTransaction = async () => {
try {
// Try sending a transaction
await metamaskContext.sendTransaction({
from: account,
to: '0x...',
value: '1.0 ether',
});
} catch (error) {
console error (error);
// Rejecting a transaction
setAccount(null);
}
};
const handleRejection = async () => {
try {
// Try sending a new transaction
await metamaskContext.sendTransaction({
from: account,
to: '0x...',
value: '1.0 ether',
});
} catch (error) {
console error (error);
}
};
return (
{account && 
Account: {account}
}
Submit Transaction
Reject Operation
);
};

In this example, when the user clicks the “Submit Transaction” button, the try-catch block is executed, but the error is caught. However, if the user rejects the transaction (by clicking the “Reject Transaction” button), the error is not caught.

Solution: Rejecting operations in Try-Catch blocks

To work around this issue, you can reject operations in try-catch blocks using the “reject” method:

const handleTransaction = async () => {
try {
// Try sending a transaction
await metamaskContext.sendTransaction({
from: account,
to: '0x...',
value: '1.0 ether',
});
} catch (error) {
console error (error);
// Rejecting the operation and displaying an error message
setAccount(null);
alert('Error rejecting operation: ' + error.message);
}
};

In this modified version, when the try-catch block is executed, it catches the error. However, instead of displaying an error message, it rejects the operation and displays an error message using a “warning”.

Best Practice

Here are some best practices for handling errors in try blocks:

• Reject transactions to avoid unexpected behavior.

• Provide an error message to inform users of the problem.

• Use the “reject” method instead of catching all errors.

ethereum schnorr code core