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Network Switching using Metamask in HTML and Javascript
In this article, we will explore how to implement the functionality of the network switch using the expansion of the browser metamask at the top of HTML and Javascript. We will make a simple example that shows how to switch between different blockchain networks (eg Ethereum and Matic).
What is the network switch?
The network switch allows users to easily transfer between different blockchain networks, such as Ethereum or Matica, without the need to update the wallet software. This feature is especially useful for users who want to use more blockchain platforms on the same device.
Metamascus and blockchain wallet
Before we dive into the implementation of the network switch, you will need:
- Extension of the browser metamask installed on your device.
- Blockchain wallet (eg Ethereum or Matic) that supports metamascus extensions.
Example Code: Metamascus Network Metamscoping to HTML and Javascript
Here’s a simple example of how to implement network switching using Javascript and HTML:
`HTML
Example to switch the network
/ Add some basic style to our page /
Body {{{
Font-Biler: Arial, Sans-Serif;
Iche
Matic on Matic (EIP-1559)
<Script src = "
// Initialize your wallet's wallet
Const Web3 = New Web3 (New Window.ethereum.web3 ());
// Define blockchains we want to support
Const Blockchains = [
{name: 'Ethereum', symbol: 'et'},
{Name: 'Matic (EIP-1559)', symbol: 'Matic'}
];
// Select a Metamascus Calcoth button and update it based on our choice of blockchain
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;
Iche
});
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;
Iche
});
// Listen to changes to the metamascus wallet
Window.ethereum.on ('Change', () => {
IF (Web3.SeleCTedblockchain) {
Const networkname =network switch: $ {web
Document.getelementbyid (‘network-bep20-token’). Textcontent = networkname;
web3.SelecTedblockchain = web3.Selectedblockchain.name;
Iche
});
`
This example shows how:
- Select a Metamascus wallet button.
- Listen to changes in the metamascus wallet (eg when a new blockchain is supported).
- Update the textual contents of the.network-bep20-token
I.network-Mar-tokenbased on our selected blockchain.
Note: This example assumes that you have a metamascus expansion on your browser and use Ethereum or Matic as a target blockchain. You will need to update a series ofblockchains’ and select the appropriate blockchains when creating a wallet.
