If the field value added in is invalid, the oninvalid event will be triggered. Add a message if the user forgets to fill out the form before submitting.
You can try running the following code to understand how to implement the oninvalid event in JavaScript.
<!DOCTYPE html>
<html>
<body>
<script>
function resetFunct() {
alert("The form was reset");
}
</script>
<form>
Enter Name: <input type="text"
required oninvalid = "alert('Fill the form before submitting!');" > <br>
Enter birth month: <input type= "text"> <br>
<input type = "submit">
<input type = "reset">
</form>
</body>
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