如何在 MetaMask 上触发更改区块链网络请求
How to trigger change blockchain network request on MetaMask
我正在使用 web3 进行我的第一个 dapp 测试,我想这样做 MetaMask 将提示用户将网络更改为 Binance (BSC) 网络,如果尚未选择,就像这里:
如何触发这样的请求?
终于找到答案了:
await window.ethereum.request({
method: 'wallet_switchEthereumChain',
params: [{ chainId: '0x61' }], // chainId must be in hexadecimal numbers
});
一个更全面的答案是检查是否安装了 MetaMask,以及是否安装了你的 Dapp 想要连接的链,如果没有安装它:
// Check if MetaMask is installed
// MetaMask injects the global API into window.ethereum
if (window.ethereum) {
try {
// check if the chain to connect to is installed
await window.ethereum.request({
method: 'wallet_switchEthereumChain',
params: [{ chainId: '0x61' }], // chainId must be in hexadecimal numbers
});
} catch (error) {
// This error code indicates that the chain has not been added to MetaMask
// if it is not, then install it into the user MetaMask
if (error.code === 4902) {
try {
await window.ethereum.request({
method: 'wallet_addEthereumChain',
params: [
{
chainId: '0x61',
rpcUrl: 'https://data-seed-prebsc-1-s1.binance.org:8545/',
},
],
});
} catch (addError) {
console.error(addError);
}
}
console.error(error);
}
} else {
// if no window.ethereum then MetaMask is not installed
alert('MetaMask is not installed. Please consider installing it: https://metamask.io/download.html');
}
async switchEthereumChain() {
try {
await window.ethereum.request({
method: 'wallet_switchEthereumChain',
params: [{ chainId: '0x61' }],
});
} catch (e: any) {
if (e.code === 4902) {
try {
await window.ethereum.request({
method: 'wallet_addEthereumChain',
params: [
{
chainId: '0x61',
chainName: 'Smart Chain - Testnet',
nativeCurrency: {
name: 'Binance',
symbol: 'BNB', // 2-6 characters long
decimals: 18
},
blockExplorerUrls: ['https://testnet.bscscan.com'],
rpcUrls: ['https://data-seed-prebsc-1-s1.binance.org:8545/'],
},
],
});
} catch (addError) {
console.error(addError);
}
}
// console.error(e)
}
}
虽然上面的答案对我不起作用,但它给我一个错误 Unsupported keys:\nrpcUrl" 这是因为它应该是数组中的 rpcUrls 而不是 rpcUrl字符串,还要注意 blockExplorerUrls。
您可以找到 metamask 的文档 here
我正在使用 web3 进行我的第一个 dapp 测试,我想这样做 MetaMask 将提示用户将网络更改为 Binance (BSC) 网络,如果尚未选择,就像这里:
如何触发这样的请求?
终于找到答案了:
await window.ethereum.request({
method: 'wallet_switchEthereumChain',
params: [{ chainId: '0x61' }], // chainId must be in hexadecimal numbers
});
一个更全面的答案是检查是否安装了 MetaMask,以及是否安装了你的 Dapp 想要连接的链,如果没有安装它:
// Check if MetaMask is installed
// MetaMask injects the global API into window.ethereum
if (window.ethereum) {
try {
// check if the chain to connect to is installed
await window.ethereum.request({
method: 'wallet_switchEthereumChain',
params: [{ chainId: '0x61' }], // chainId must be in hexadecimal numbers
});
} catch (error) {
// This error code indicates that the chain has not been added to MetaMask
// if it is not, then install it into the user MetaMask
if (error.code === 4902) {
try {
await window.ethereum.request({
method: 'wallet_addEthereumChain',
params: [
{
chainId: '0x61',
rpcUrl: 'https://data-seed-prebsc-1-s1.binance.org:8545/',
},
],
});
} catch (addError) {
console.error(addError);
}
}
console.error(error);
}
} else {
// if no window.ethereum then MetaMask is not installed
alert('MetaMask is not installed. Please consider installing it: https://metamask.io/download.html');
}
async switchEthereumChain() {
try {
await window.ethereum.request({
method: 'wallet_switchEthereumChain',
params: [{ chainId: '0x61' }],
});
} catch (e: any) {
if (e.code === 4902) {
try {
await window.ethereum.request({
method: 'wallet_addEthereumChain',
params: [
{
chainId: '0x61',
chainName: 'Smart Chain - Testnet',
nativeCurrency: {
name: 'Binance',
symbol: 'BNB', // 2-6 characters long
decimals: 18
},
blockExplorerUrls: ['https://testnet.bscscan.com'],
rpcUrls: ['https://data-seed-prebsc-1-s1.binance.org:8545/'],
},
],
});
} catch (addError) {
console.error(addError);
}
}
// console.error(e)
}
}
虽然上面的答案对我不起作用,但它给我一个错误 Unsupported keys:\nrpcUrl" 这是因为它应该是数组中的 rpcUrls 而不是 rpcUrl字符串,还要注意 blockExplorerUrls。
您可以找到 metamask 的文档 here