ประเภทหนัง
Ethereum: How to accessing Smart Contract write function from the frontend (React Js ) without any private key? ตัวอย่างหนัง Ethereum: How to accessing Smart Contract write function from the frontend (React Js ) without any private key?
Access the functions of intelligent contract from Fronnd without a private key on react.js
Navigating the Ethereum -based project using intelligent solidity contracts written in JavaScript, one of the common challenges arises when it comes to accessing specific characteristics of these contracts. Especially if the intelligent contractual methods of the contract do not require a private key for implementation, it is essential that we find alternative methods to call these characteristics from Fronnd without endangering security.
In this article, we are immersed in the characteristics of its implementation using React.js and we understand why the current configuration can be launched, such as the “unknown account” when trying to draw contract methods.
Understand force contracts
Before entering the solution, let’s quickly review some basic concepts on Ethereum’s smart contracts:
* Private Keys: These are necessary to sign transactions, but are not obliged to call certain characteristics (such as “ContractMethods”).
* Contract installation: The contract installation process includes the creation of an invoice in the Ethereum Network and sign an installation message using the private key. This is required before implementing the smart contract code.
* Virtual Machine (VM): Each Ethereum Union acts as its own virtual machine, which allows self -implementation of intelligent contracts independently.
Why does the error come?
The error of “Unknown Account” generally occurs when he tries to call a function to the Ethereum contract without being signed correctly by a private key. Here are some scenarios that can lead to this question:
* Signature not sufficient: When you try to draw “methods of methods”, be sure to sign the transaction with the help of public and private keys.
* Incorrect address of the contract:
Verify twice that the address of the contract you try to access is correct, since it can affect the behavior of the contract.
Solution: Access smart contract functions without private key
Overcome these restrictions when developing react.js applications with intelligent intelligent solidity:
1. Use a web directory
A popular solution for this is to use a web 3 directory, such as web3.js or Ethers.js to interact with the Ethereum Network.
Example using web3.js:
`JavaScript
Import web3 of 'web3';
Const web3 = new web3 ();
// Establish the network and Ethereum account
const ethnnetwork = 'mainnet';
Const youracount = '0x ... your account ---';
// Connect to Ethereum Network
Web3.eth.net.eableweb3Provider ();
Async CallContractfunction Function () {
Attempt {
// Call the contract method without a private key
Const answers = waiting web3.eth.call ({{{{
Subdate: Yourccount,
Data:0x $ {counter -ADDDRESS}
Gas: '2000000',
Arguments: [functionnone],
});
Console.log (answer);
} capt (error) {
Console.error (error);
}
}
2. Complete the webhooks contract
Another approach is to use contract web books that allow you to send events or notifications from Fronnd directly to the Ethereum Network.
JavaScript
Import {contract, contract} of "ethers";
Constctractddress = '0x ... your contract address ...');
Const functionnone = 'your function ...';
Async Manual Function -Contractevent () {
Const event = wait for contractaddress.events [functiontolname];
Switch (Event.name) {
Case "Function called":
Console.log ('called the specified function!');
pause;
Default:
Console.eror (unknown function $ {event.name}!);
}
}
`
3. Use a directory like Ethers.js
Ethers.
ความคิดเห็น
หนังอื่นๆ น่าสนใจ
