Get the solution ↓↓↓
What you need is to pass anevent to the submit function, and useevent.preventDefault() to stop the submission.
function hii(event, Name, Mobile) {
let Count = 0;
if (Name == "" || Name == null) {
document.getElementById("nameerror").style.display = "block";
document.getElementById("nameerror").innerHTML =
"Please Enter Student Name";
Count++;
}
if (Mobile == "" || Mobile == null) {
document.getElementById("mobileerror").style.display = "block";
document.getElementById("mobileerror").innerHTML =
"Please Enter Student Mobile";
Count++;
}
if (Count > 0) {
event.preventDefault();
alert(Count);
}
}<form
action="addstudent.php"
method="POST"
onsubmit="hii(
event,
document.getElementById('name').value,
document.getElementById('mobile').value
)"
>
<input
type="text"
name="name"
id="name"
placeholder="Enter Student Name"
/><br /><br />
<label
for=""
id="nameerror"
style="display: none; color: red; font-size: small"
></label>
<input
type="number"
name="mobile"
id="mobile"
placeholder="Enter Mobile Number"
/><br /><br />
<label
for=""
id="mobileerror"
style="display: none; color: red; font-size: small"
></label>
<input type="submit" value="add" />
</form>You have to return the value in the handler
<form action="addstudent.php" method="POST" onsubmit="return hii(
document.getElementById('name').value,
document.getElementById('mobile').value
)">
But better yet is to keep it all together in your script
<form action="addstudent.php" method="POST">
<!-- remove the onsubmit here -->
<input type="submit" value="add">
<!-- we'll put the listener here -->
Then, your script
document.querySelector('input[type="submit"]').addEventListener('click', function(e) {
e.preventDefault();
let Count = 0;
let Name = document.getElementById('name').value;
let Mobile = document.getElementById('mobile').value
if (Name == "" || Name == null) {
document.getElementById('nameerror').style.display = 'block';
document.getElementById('nameerror').innerHTML = 'Please Enter Student Name';
Count++;
}
if (Mobile == "" || Mobile == null) {
document.getElementById('mobileerror').style.display = 'block';
document.getElementById('mobileerror').innerHTML = 'Please Enter Student Mobile';
Count++;
}
if (Count > 0) {
alert(Count);
return false;
}
document.querySelector('form').submit()
})
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