combining the approval of the token and invocation of the contract in ethers.js
When interacting with decentralized applications (dapps) built on ethereum, a common pattern implies transferring tokens to an intelligent contract. However, this can lead to unnecessary general expenses and possibly safety risks due to the two separate calls required: token approval and contract invocation.
In our current implementation, we make two separate calls:
Appearator Token.Approve (Contractaddress, Amount);
- Wait contract. Myfunction (); – Invoke the contract function using the approved tokens.
This approach can be cumbersome and prone to errors, since it requires the manual management of the Approval Process and Guarantees that only specific functions are invoked in the contract.
Single Call presentation: Token Approval and Contract Invocation at ETHERS.JS
To simplify this process and reduce unnecessary overload, we will introduce a new method called ‘Yvoke approval’. This function will combine the approval of token with the invocation of the contract in a single call.
`Javascript
Import {ETHERS} of 'ETHERS';
/**
* Combine the approval of the token and the invocation of the contract in a single call.
*
* @param {string} tokenaddress: The direction of the token to approx.
* @param {string} Contractaddress: The address of the intelligent contract to invoke.
* @Param {number} quantity: the amount of tokens to approve for the contract.
*//
Async Apreseandinvoke function (tokenaddress, contractdress, quantity) {
// obtain the supplier's instance
Const a provider = aleath ethers.getprovider ();
// Approve the Token for the Given Contract
Constator Constator = Take Advantage of (Tokenaddress, Contractaddress, Quantity);
If (
// Invoke the Contract Function Using approved tokens
Attempt {
Shark.
} capt (error) {
Console.error (Error); // token approval and invocation
}
}
Export predetermined andvake approval;
Example use
Javascript
Import {approveseandinvoke} of './Approveandinvoke';
// Replace with your token address, contract and amount address
Const tokenaddress = '0x ...'; // Replace with the Real Address Token
Const Contractaddress = '0x ...'; // Replace with the directorate of the Royal Contract
Const = 10n canification;
Yvoke Apprier (tokenaddress, contractaddress, quantity) .then (() => {
Console.log ('tokens approved and successfully invoked!');
}). Catch ((error) => {
Console.error (Error); // token approval and invocation
});
ThisYvoke ” Function takes the requirement parameters, approves the specified tokens for the contract given and invokes the contract function using those approved tokens. This approach reduces the overload of manual token approval and the invocation of the contract, so it is a more convenient and safe way to interact with dapps built on ethereum.