index.html
<!DOCTYPE html>
<html lang="en">
<body>
<input type="text" id="input">
<button type="button" id='btn'>submit</button>
<script>
document.getElementById('btn').addEventListener('click',validate);
function validate(){
const x=document.getElementById('input').value;
if(x==''){
alert('Please Enter Name');
}
}
</script>
</body>
</html>
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