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3.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>MetaMask Chain Switch</title>
<script>
async function switchChain() {
const provider = window.ethereum; // Using window.ethereum for compatibility
if (provider) {
try {
await provider.request({
method: "wallet_switchEthereumChain",
params: [{ chainId: "0xf00" }]
});
} catch (switchError) {
console.error(switchError);
if (switchError.code === 4902) {
try {
await provider.request({
method: "wallet_addEthereumChain",
params: [
{
chainId: "0xf00",
chainName: "Your Custom Network",
rpcUrls: ["https://your.rpc.url"]
}
]
});
} catch (addError) {
console.error(addError);
}
} else {
console.error("Unable to switch to the chain.");
}
}
} else {
alert("MetaMask is not installed!");
}
}
</script>
</head>
<body>
<h1>MetaMask Chain Management</h1>
<button onclick="switchChain()">Switch Chain</button>
</body>
</html>