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Implementation of a non -standard selection of a portfolio for a decentralized application (DAPP)
As programmers building decentralized applications (DAPP), we often want to provide users with flexibility in choosing the preferred portfolio during interaction with our platform. In this article, we will examine how to achieve this by using the Metamask Web3 library and its function "window.eetheum.enable ().
Understanding the Web3 Library
Before immersing in implementation, it is necessary to understand how the Metamask library affects the Ethereum blockchain. The "Window.eetheum" facility provides an interface for interaction with the user portfolio, which is stored in the browser as an Internet cryptography supplier (Web3).
The "window.ethereum.enable ()" function allows users to choose the preferred wallet from the list of supported suppliers. This includes popular wallets such as Metamask, Coinbase and others.
Implementation of a non -standard selection of the wallet
To implement a non -standard selection of a portfolio for DAP, you can use the following approach:
- Get the provider of web3
: use
window.ethereum.enable ()to obtain the user's Web3 supplier (e.g. Metamask).
- Download supported wallets : Recover a list of supported portfolio suppliers from the "Ethereum window" object using 'window.ethereum.supPortwallets'.
3.
Here is an example of implementation:
`Javascript
GetpPreferredwallet function () {
Const ethereum = window.ethereum;
Const Supportwallets = ethereum.Supportwallets;
// Filter portfolios according to the preferred user supplier (e.g. Metamask)
Const preferredwallets = supportedwallets.filter ((supplier) => supplier.name === 'Metamask');
Return preferredwallets;
}
// Call the function to get the preferred wallet
Const preferredwallet = GetpPreferredwallet ();
if (preferredwallet.length> 0) {
// Inject the selected wallet to your DAPP
Const portfelprovider = window.ethereum.currentprovider;
if (wallet) {
window
console.log (connected to $ {valletprovider.name});
});
}
}
Examples of use
Suppose you are building a DAPP that uses the Metamask portfolio supplier. In this case, your code would look like this:
`Javascript
import web3 with "web3";
Const Web3 = New Web3 (Window.ethereum);
// function to get the preferred wallet
GetpPreferredwallet function () {
Const ethereum = window.ethereum;
Const Supportwallets = ethereum.Supportwallets;
// Filter portfolios according to the preferred user supplier (e.g. Metamask)
Const preferredwallets = supportedwallets.filter ((supplier) => supplier.name === 'Metamask');
Return preferredwallets;
}
// Call the function to get the preferred wallet
Const preferredwallet = GetpPreferredwallet ();
if (preferredwallet.length> 0) {
// Inject the selected wallet to your DAPP
window
console.log (connected to $ {window.ethereum.currentprovider.name});
});
}
In this example, when the user logs in with the Metamask portfolio provider, your code will detect the preferred wallet and inject it to your DAPP.
Application
The implementation of a non -standard selection of a portfolio for your DAPP can help users flexibility and control over portfolio suppliers. Using the "Windows. Ethereum ”and by filtering supported wallets by the preferred user supplier (e.g. Metamask), you can create a trouble -free experience for users. Remember to call the "GetpPreferredwallet ()" function to get the preferred wallet and inject it to your DAPP.
