We will connect MetaMask wallet and get accounts with javascript basically.
Try demo here:
https://inancakduvan.github.io/connect-metamask-wallet/
Find source code on github:
https://github.com/inancakduvan/connect-metamask-wallet
1) Check if MetaMask plugin installed on browser
If not, redirect user to MetaMask download page.
const connectButton = document.getElementById("connectButton");
connectButton.addEventListener("click", () => {
if (typeof window.ethereum !== "undefined") {
console.log("MetaMask installed")
} else {
window.open("https://metamask.io/download/", "_blank");
}
})
2) Get accounts if MetaMask installed
MetaMask plugin will automatically open when we send a request to get accounts.
const connectButton = document.getElementById("connectButton");
const walletID = document.getElementById("walletID");
if (typeof window.ethereum !== "undefined") {
ethereum
.request({ method: "eth_requestAccounts" })
.then((accounts) => {
const account = accounts[0]
walletID.innerHTML = `Wallet connected: ${account}`;
})
} else {
window.open("https://metamask.io/download/", "_blank");
}
3) Handle errors
Handling errors is a good practise to guide the user correctly.
(For example: show a loader while user is connecting wallet and hide it if user cancel process)
const connectButton = document.getElementById("connectButton");
const walletID = document.getElementById("walletID");
connectButton.addEventListener("click", () => {
if (typeof window.ethereum !== "undefined") {
ethereum
.request({ method: "eth_requestAccounts" })
.then((accounts) => {
const account = accounts[0]
walletID.innerHTML = `Wallet connected: ${account}`;
}).catch((error) => {
// Handle error
console.log(error, error.code);
// 4001 - The request was rejected by the user
// -32602 - The parameters were invalid
// -32603- Internal error
});
} else {
window.open("https://metamask.io/download/", "_blank");
}
})
It is done here, we can say. But if you are interested in some extra suggestions, keep reading:
EXTRA SUGGESTIONS
4) Show a loader while user is connecting wallet via plugin
const connectButton = document.getElementById("connectButton");
const walletID = document.getElementById("walletID");
connectButton.addEventListener("click", () => {
// Start loader while connecting
connectButton.classList.add("loadingButton");
if (typeof window.ethereum !== "undefined") {
ethereum
.request({ method: "eth_requestAccounts" })
.then((accounts) => {
const account = accounts[0]
walletID.innerHTML = `Wallet connected: ${account}`;
// Stop loader when connected
connectButton.classList.remove("loadingButton");
}).catch((error) => {
// Handle error
console.log(error, error.code);
// Stop loader if error occured
connectButton.classList.remove("loadingButton");
// 4001 - The request was rejected by the user
// -32602 - The parameters were invalid
// -32603- Internal error
});
} else {
window.open("https://metamask.io/download/", "_blank");
}
})
5) Show a "Reload page" warning when user is redirected to download page
User needs to refresh page after plugin installed and so browser can re-fetch scripts. It would be a good practise to let user know about this.
const connectButton = document.getElementById("connectButton");
const walletID = document.getElementById("walletID");
const reloadButton = document.getElementById("reloadButton");
const installAlert = document.getElementById("installAlert");
connectButton.addEventListener("click", () => {
// Start loader while connecting
connectButton.classList.add("loadingButton");
if (typeof window.ethereum !== "undefined") {
ethereum
.request({ method: "eth_requestAccounts" })
.then((accounts) => {
const account = accounts[0]
walletID.innerHTML = `Wallet connected: ${account}`;
// Stop loader when connected
connectButton.classList.remove("loadingButton");
}).catch((error) => {
// Handle error
console.log(error, error.code);
// Stop loader if error occured
// For example, when user cancelled request
// and closed plugin
connectButton.classList.remove("loadingButton");
// 4001 - The request was rejected by the user
// -32602 - The parameters were invalid
// -32603- Internal error
});
} else {
window.open("https://metamask.io/download/", "_blank");
// Show 'Reload page' warning to user
installAlert.classList.add("show");
}
})
// Reload the page on reload button click
reloadButton.addEventListener("click", () => {
window.location.reload();
});
6) Check if user is on mobile device
If user is on mobile device, MetaMask application's browser should be used to be connected.
const connectButton = document.getElementById("connectButton");
const walletID = document.getElementById("walletID");
const reloadButton = document.getElementById("reloadButton");
const installAlert = document.getElementById("installAlert");
const mobileDeviceWarning = document.getElementById("mobileDeviceWarning");
connectButton.addEventListener("click", () => {
// Start loader while connecting
connectButton.classList.add("loadingButton");
if (typeof window.ethereum !== "undefined") {
ethereum
.request({ method: "eth_requestAccounts" })
.then((accounts) => {
const account = accounts[0]
walletID.innerHTML = `Wallet connected: ${account}`;
// Stop loader when connected
connectButton.classList.remove("loadingButton");
}).catch((error) => {
// Handle error
console.log(error, error.code);
// Stop loader if error occured
// For example, when user cancelled request
// and closed plugin
connectButton.classList.remove("loadingButton");
// 4001 - The request was rejected by the user
// -32602 - The parameters were invalid
// -32603- Internal error
});
} else {
// Find the function which checks if device is mobile
// at my github repo or anywhere
if (isMobile()) {
mobileDeviceWarning.classList.add("show");
} else {
window.open("https://metamask.io/download/", "_blank");
// Show 'Reload page' warning to user
installAlert.classList.add("show");
}
}
})
// Reload the page on reload button click
reloadButton.addEventListener("click", () => {
window.location.reload();
});
Here is html and css:
<div class="container">
<button class="button" id="connectButton">
Connect wallet
<span id="loading">
<span>•</span><span>•</span><span>•</span>
</span>
</button>
<div id="walletID">Your wallet is not connected yet.</div>
<div id="mobileDeviceWarning">
If you are on a mobile phone, please use MetaMask
application's browser to connect.
</div>
</div>
<div class="alert" id="installAlert">
Please refresh your browser after installing the Metamask plugin
<button class="button" id="reloadButton">Reload page</button>
</div>
.container {
position: relative;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
width: 100%;
height: 100vh;
}
.button {
position: relative;
display: flex;
align-items: center;
justify-content: center;
border: none;
outline: none;
box-shadow: 0 1px 5px 0 #e6e9ef;
background: #ffffff;
color: #000;
border-radius: 99px;
padding: 16px 32px;
font-family: 'Quicksand', sans-serif;
font-size: 24px;
font-weight: 500;
cursor: pointer;
}
#connectButton {
margin-bottom: 16px;
color: #eb874b;
}
#walletID span{
max-width: 90%;
margin: 0 auto;
font-size: 12px;
font-weight: 600;
}
#mobileDeviceWarning {
display: none;
margin-top: 24px;
color: rgb(247, 47, 47);
}
#mobileDeviceWarning.show {
display: block;
}
.alert {
z-index: 10;
position: fixed;
left: 0;
top: 0;
display: none;
flex-direction: column;
align-items: center;
justify-content: center;
width: 100%;
height: 100vh;
background: #ffffff;
}
.alert.show {
display: flex;
}
.alert .button {
margin-top: 24px;
}
/* Loading dots styles */
@keyframes opacity {
0% { opacity: 1; }
100% { opacity: 0; }
}
.loadingButton {
pointer-events: none;
}
.loadingButton #loading {
display: flex;
}
#loading {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
display: none;
align-items: center;
justify-content: center;
background: #fff;
border-radius: 99px;
}
#loading span:not(:last-child) {
margin-right: 5px;
}
#loading span {
animation-name: opacity;
animation-duration: 1s;
animation-iteration-count: infinite;
}
#loading span:nth-child(2) {
animation-delay: 100ms;
animation-delay: 100ms;
}
#loading span:nth-child(3) {
animation-delay: 300ms;
animation-delay: 300ms;
}
Find source code on github:
https://github.com/inancakduvan/connect-metamask-wallet
Follow me on:
Github: https://github.com/inancakduvan/
Twitter: https://twitter.com/InancAkduvan
Thank you for reading 🙂
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