Metamask: Metamask Connect Button Not working when adding “Deposit” function

Metamask Connect Button Not Working with “Deposit” Function

I recently encountered a frustrating issue while trying to integrate Metamask into my basic app using the Ethers.js library in JavaScript. Specifically, I’m experiencing problems when attempting to add the “Deposit” function to my Metamask-enabled contract.

In this article, we’ll go through the steps to troubleshoot and resolve the issue, ensuring your Metamask-connected app functions correctly with the “Deposit” function.

The Problem

When adding the following code to create a new instance of your contract:

import { ethers } from './ethers-5.6.esm.min.js';

import { yes , contractAddress } from ' . / metamask - yes . json ' ;


const contract = new ethers . Contract ( contractAddress , etc );

You get an error message indicating that the connect function is not defined:

Error: connection is undefined

This error occurs because Metamask has not been properly configured to connect to your Ethereum network. The “Deposit” function relies on this connection to execute.

Troubleshooting Steps

To resolve this issue, you’ll need to ensure that:

• Metamask is enabled: Go to the MetaMask browser extension or app and enable it for your account.

• Metamask is installed: Make sure that Metamask is installed on your machine by going to Settings > Devices > Installing/Updating and selecting “Metamask”

• Network connection is established: Verify that a network connection has been established with the Ethereum blockchain (e.g., Ethereum mainnet, Rinkeby testnet).

Code Modifications

Here’s an updated example of how you can modify your index.js file to include the necessary code for Metamask:

import { ethers } from './ethers-5.6.esm.min.js';

import { yes , contractAddress } from ' . / metamask - yes . json ' ;


const contract = new ethers.Contract(contractAddress, etc);


// Connect to the Ethereum network using MetaMask

async function connect() { .

  try {

    wait ethers . connect ( ) ;

  } catch (error) {

    console.error('Error connecting to Metamask:', error);

  } }

} }


connect ( ) ;


// Add the "Deposit" function

contract. on ( 'Deposited' , async ( deposit , receipt ) => { ;

  // Handle deposited amount logic here

  console.log(Deposited ${deposit.toNumber()} tokens!);

});


// Add a button to trigger the deposit function

function createButton() {

  const button = document.createElement('button');

  button.textContent = 'Deposit';

  button.addEventListener('click', async() => {

    await contract.deposit();

    // Handle successful deposit logic here

  });

  document. body. appendChild ( button ) ;

} }


createButton ( ) ;

Additional Recommendations

To further troubleshoot and improve the integration:

• Check that you have installed Metamask correctly on your machine.

• Verify that MetaMask is properly configured to connect to your Ethereum network (e.g., network type, wallet address).

• Consider adding logging statements throughout your code to monitor errors and debug issues.

By following these steps and modifications, you should be able to resolve the issue with the “Deposit” function not working when using Metamask in your basic app.