Ethereum: How to display solidity’s custom errors on frontend?
SOLIDITY Customized error shows Frontend
When designing complex decentralized applications (DAPPs), it is not uncommon for customized errors that cannot be caught by traditional error processing mechanisms. In this article, we will explore how to show the dissertation custom errors in the frontend via Ethereum Web3.You Library.
** Why show custom errors?
Custom errors are often the result of unexpected logic in your contract or third party integration. By showing them on the front you can:
1
Improve the user experience : Users will appreciate a clear indication that something went wrong.
- Improve debugging tools : Developers can use these custom errors to identify and correct problems more effectively.
Prerequisites
Before we dive, make sure you have:
- Basic mark on solidity and web3.js
- Agreement placed on Ethereum Blockchain
Displaying custom errors with Web3.js
In this example, we will use Web3.js to show custom errors in the frontend application. We will create an event emitter listening to the events of "CustomAerror" emitted in your contract.
First installWeb3.Js and ‘W3-LoggerLibraries:
Bash
NPM install Web3 W3 Logger
implementation of contract
`SOLIDITY
Pragma Solidity 0.8.16;
Checking the contract {
Event Customror (UINT256 value);
Uint public a;
CONSTRUCTOR () Public {
Emits Customerror (10); // Error code example
}
Function Test Function () External Pure Return (Bool) {
A = 5; // This should cause a custom error
Return the truth; // Successful execution
}
}
Frontend implementation
`JavaScript
Import * as W3 from “Web3”;
Import {events} from “W3 Logger”;
Class Frontendapp {
Constructor (W3instance) {
this.w3 = W3instance;
Constemitter = new events ();
Eventemiter.on (“CustomAerror”, (Errorvalu) => {
Console.Error (“Custom Error: $ {Errorvalue});
// Action with custom error logic here
});
// Placement Agreement
place the contract (W3instance);
}
ASYNC deploys a contract (W3instance) {
Forms the address = "0x ..."; // Replace with your contract address
Constalabi = "..."; // Replace with your contract both
Const Web3 = New W3.Web3 (W3instance, Contractabi);
Expect Web3.eth.Devoy Agreement (Agreement Address);
}
}
PROFTENDA ACTIVITY
To run this frontend application, you will need to set up a new solidity agreement and deploy. Then import the class “FrontendApp” and call its constructor.
`JavaScript
Const W3instance = ask (“Web3”) (“http: // Localhost: 8545”);
ConstvontendApp = New FrontendApp (W3instance);
`
Customized error processing
In your Frontend application you can handle custom errors using the trial Catch Block:
`JavaScript
Try {
CONSTUS = Expect FrontendApp.tfunction ();
Console.log (result);
} Catch (error) {
Console.Error (Custom Error: $ {Error.Message} );
}
By showing customized errors in the frontend, you can enhance the user experience of the application and make it easier for developers to identify and prevent problems.
Conclusion
Displaying custom errors is an important step in creating a robust decentralized applications. By using the `web3 and introducing a custom error processing system, you can improve the usability and debugging of your frontend application. This example shows you how to place a contract for the Ethereum Blockchain and show custom errors in the pediatrician via Web3.