I am currently learning JavaScript and working on an enrollment form that requires validating a cellphone number with 11 characters. The issue I'm facing is that every time I hit submit, the page refreshes instead of displaying the validation message. Any suggestions on how to fix this?
Form Code:
<!doctype html>
<html lang="en">
<head>
<title>Enrollment Form</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<link href = "design.css" rel = "stylesheet" type="text/css"/>
<script src="JAVASCRIPT.js" type="text/jsx"></script>
</head>
<body>
<h1 class="display-1">Enrollment Form</h1>
<div class="container">
<div class="row">
<div class="col-lg-3"></div>
<div class="col-lg-6">
<div id ="ui">
<form id = "form" class="form-group">
<div class="row">
<div class="col-lg-8">
<label >Cellphone Number</label>
<input id = "Cp_Number" type="text" class="form-control" placeholder="Enter Cellphone Number..." required>
</div>
<div class="col-lg-4">
<label >Age</label>
<input id = "Age" type="text" class="form-control" placeholder="Enter your age..." required>
</div>
<br>
<div class="row">
<div class="col-lg-6">
<button type="submit" class="btn btn-primary btn-block">Submit</button>
</div>
<div class="col-lg-6">
<a href="Homepage.html" id="cancel" name="cancel" class="btn btn-primary btn-block" onclick="return confirm('Are you sure you want to cancel the Enrollment?')">Cancel</a>
</div>
</div >
</form>
</div>
</div>
<div class="col-lg-3"></div>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</body>
</html>
Note: Only essential fields for validation will be included in the form.
JS code:
const Cp_num = document.getElementById('Cp_Number')
const age = document.getElementById('Age')
const form = document.getElementById('form')
form.addEventListener('submit', (e) =>{
var isValid = true;
e.preventDefault();
if(isNaN(Cp_num) || Cp_num.value == null || Cp_num.value == ''){
alert ("Your Cellphone number is invalid!")
isValid === false;
}
if (Cp_num >=12){
alert ("Your Cellphone number is invalid!")
isValid === false;
}
if(isNaN(age) || age.value == null || age.value == ''){
alert ("Your Age is invalid!")
isValid === false;
}
if (isValid === true){
popUp();
}
})