Using JAVASCRIPT make this file use the following input validation

The current code is in PHP so add/change what is needed in so all of the input validation is in JAVASCRIPT

Form Validation:

In this assignment there will be 5 things to validate:

1- Validate that the names are filled in, first and last name

2- Validate that they are letters, upper case and lower case. (You can use /^[a-zA-Z]+$/ as the regular expression)

3- Check to make sure the phone number is all numbers. (You can use /^[0-9]+$/ as the regular expression)

4- If they are updating the form make sure the form is filled out completely.

5- If they are creating a new record make sure they filled the form out completely.

If any of these fields are not met then the form will produce an alert and let them know what they are missing.

include_once("config.php"); if(isset($_POST['Submit'])) { $name = $_POST['name']; $lastname = $_POST['lastname']; $age = $_POST['age']; $email = $_POST['email']; $address = $_POST['address']; $phonenumber = $_POST['phonenumber']; $city = $_POST['city']; $state = $_POST['state']; $zip = $_POST['zip']; $username = $_POST['username']; $password = $_POST['password']; $birthdate = $_POST['birthdate']; $relationship = $_POST['relationship']; // checking empty fields if(empty($name) || empty($lastname) || empty($age) || empty($email)|| empty($address)|| empty($phonenumber)|| empty($city)|| empty($state)|| empty($zip)|| empty($username)|| empty($password)|| empty($birthdate)|| empty($relationship)) { if(empty($name)) { echo "Name field is empty.
"; } if(empty($lastname)) { echo "Last Name field is empty.
"; } if(empty($age)) { echo "Age field is empty.
"; } if(empty($email)) { echo "Email field is empty.
"; } if(empty($address)) { echo "Address field is empty.
"; } if(empty($phonenumber)) { echo "Phone Number field is empty.
"; } if(empty($city)) { echo "City field is empty.
"; } if(empty($state)) { echo "State field is empty.
"; } if(empty($zip)) { echo "Zip Code field is empty.
"; } if(empty($username)) { echo "Username field is empty.
"; } if(empty($password)) { echo "Password field is empty.
"; } if(empty($birhdate)) { echo "Birhdate field is empty.
"; } if(empty($relationship)) { echo "Relationship field is empty.
"; } //link to the previous page echo "
Go Back"; } else { // if all the fields are filled (not empty) //insert data to database $result = mysqli_query($mysqli, "INSERT INTO users(name,lastname,age,email,address,phonenumber,city,state,zip,username,password,birthdate,relationship) VALUES('$name','$lastname','$age','$email','$address','$phonenumber','$city','$state','$zip','$username','$password','$birthdate','$relationship')"); //display success message echo "Data added successfully."; echo "
View Result"; } } ?>