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Network Switching with Metamask HTML and JavaScript
In this article, we will explore how to implement network switching using the MetaMask browser extension in HTML and JavaScript. We will create a simple example that will demonstrate how to switch between different blockchain networks (e.g. Ethereum and Matic).
What is network switching?
Network switching allows users to easily switch between different blockchain networks, such as Ethereum or Matic, without having to update their wallet software. This feature is especially useful for users who want to use multiple blockchain platforms on the same device.
Setting up MetaMask and a blockchain wallet
Before you begin implementing network switching, you will need:
- The MetaMask browser extension installed on your device.
- A blockchain wallet (e.g. Ethereum or Matic) that supports MetaMask extensions.
Code example: Metamask network switching using HTML and JavaScript
Here is a simple example of network switching using JavaScript and HTML:
Network Switching Example / Add some basic styling to our page /
body {
font-family: Arial, sans-serif;
}
<script src="
// Initialize MetaMask wallet
const web3 = new Web3(new window.ethereum.Web3());
// Define the blockchains we want to support
const blockchains = [
{ name: 'Ethereum', symbol: 'ETH' },
{ name: 'Matic (EIP-1559)', symbol: 'MATIC'}
];
// Select the MetaMask Wallet button and update it to our blockchain selection
document.getElementById('bep20Button').addEventListener('click', () => {
const blockchain = blockchains.find(blockchain => web3.isSupported(blockchain.name));
if (blockchain) {
const networkName = Network Switch: ${blockchain.symbol}
;
document.getElementById('network-bep20-token').textContent = networkName;
web3.selectedBlockchain = blockchain;
}
});
document.getElementById('maticButton').addEventListener('click', () => {
const blockchain = blockchains.find(blockchain => web3.isSupported(blockchain.name));
if (blockchain) {
const networkName = Network Switch: ${blockchain.symbol}
;
document.getElementById('network-matic-token').textContent = networkName;
web3.selectedBlockchain = blockchain;
}
});
// Watch for changes to the MetaMask wallet
window.ethereum.on('change', () => {
if (web3.selectedBlockchain) {
const networkName = Network Switch: ${web3.selectedBlockchain.symbol}
;
document.getElementById('network-bep20-token').textContent = networkName;
web3.selectedBlockchain = web3.selectedBlockchain.name;
}
});
This example shows how to:
- Select the MetaMask Wallet button.
- Note any changes to the MetaMask wallet (e.g., when a new blockchain is supported).
- Update the text content of the `
.network-bep20-token'' and
`.network-matic-token» elements to match our chosen blockchain.
Note: This example assumes that you have the MetaMask extension installed in your browser and are using Ethereum or Matic as your target blockchain. When creating your wallet, you must update the Blockchains array and select the appropriate blockchains.