Generate a unique ID in Javascript
In this tutorial, we are going to see how to generate a unique ID. JavaScript does not have a built-in method for generating unique identifiers, but you can use a method called Math.random() which generates a unique alphanumeric string on each call.
How to Generate a unique ID in Javascript
<!DOCTYPE html>
<html>
<body>
<p>Click on the button to generate a unique ID.</p>
<button onclick="generate()">Click here</button>
<p id="uniqueID"></p>
<script>
function generate() {
let id = () => {
return Math.floor((1 + Math.random()) * 0x10000)
.toString(16)
.substring(1);
}
document.getElementById("uniqueID").innerHTML = id();
}
</script>
</body>
</html>
| Result |
|---|
|
Click on the button to generate a unique ID. |
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This is not unique.
Let us not confuse unique with random!