Я создал страницу html SignUp с проверкой в javascript. Вот код проверки.

SignUp.html

<script type = "text/javascript">

function validateForm() { 
var id = document.signup.LoginId;
var password = document.signup.LoginPassword;
var cpassword = document.signup.ConfirmPassword;
var city = document.signup.City;
var state = document.signup.State;
var number = document.signup.PhoneNumber;
var email = document.signup.Email;
var address = document.signup.Address;
var zipcode = document.signup.ZipCode;

if(id.value == "") {
    window.alert("Error: Username should be filled out.");
    id.focus();
    return false;
}
re = /^\w+$/;
if(!re.test(id.value)) {
    window.alert ("Error: Username must contain only letters, numbers and underscores.");
    id.focus();
    return false;
}

if(id.length < 6) {
    window.alert("Error: Username must contain at least 6 charecters.");
    id.focus();
    return false;
}
if(id.length > 12) {
    window.alert("Error: Username must not be greater than 12 charecters.");
    id.focus();
    return false;
}

if(password.value != "" && password.value == cpasswotd.value) {
    if(password.length < 6) {
        window.alert("Error: Password must contain at least 6 charecters.");
        password.focus();
        return false;
    }
    if(password.length > 12) {
        window.alert("Error: Password must not be greater than 12 charecters.");
        password.focus();
        return false;
    }
    if(password.value == id.value) {
        window.alert("Error: Password must be different from UserName.");
        password.focus();
        return false;
    }
    re = /[0-9]/;
    if(!re.test(password.value)) {
        window.alert("Error: Password must contain at least one number.");
        password.focus();
        return false;
    }
    re = /[a-z]/;
    if(!re.test(password.value)) {
        window.alert("Error: Password must contain at least one lowercase letter (a-z).");
        password.focus();
        return false;
    }
    re = /[A-Z]/;
    if(!re.test(password.value)) {
        window.alert("Error: Password must contain at least one uppercase letters (A-Z).");
        password.focus();
        return false;
    }
}else {
    window.alert("Error: Please check that you've entered and Confirmed your Password.");
    password.focus();
    return false;
}
window.alert("You have entered a valid password: "+password.value);
return true;



if(city.value == "") {
    window.alert("City must not be null.");
    city.focus();
    return false;
}

if(state.value == "") {
    window.alert("State must not be null.");
    state.focus();
    return false;
}

if(number.value == "") {
    window.alert("Phone number must not be null.");
    number.focus();
    return false;
}

if(number.length != 10) {
    window.alert("Phone number must be 10 digits.");
    number.focus();
    return false;
}

if (email.value == "")
{
    window.alert("Please enter a valid e-mail address.");
    email.focus();
    return false;
}

if (email.value.indexOf("@", 0) < 0)
{
    window.alert("Please enter a valid e-mail address.");
    email.focus();
    return false;
}

if (email.value.indexOf(".", 0) < 0)
{
    window.alert("Please enter a valid e-mail address.");
    email.focus();
    return false;
}

re = /^\w+$/
if(!re.test(address.value)) {
    window.alert("Error: Address must contain only letters, numbers and underscores.");
    address.focus();
    return false;
}

if(zipcode.value == "") {
    window.alert("Error: Zipcode must not be null.");
    zipcode.focus();
    return false;
}

if(zipcode.length > 6) {
    window.alert("Error: zipcode must not less than 6 digits.");
    zipcode.focus();
    return false;
}

} </script>

Когда я пытаюсь ввести неправильный адрес электронной почты, например "sapan @2" или "sapan", он не отображает сообщение об ошибке, оно сохраняется в базе данных.

Может ли кто-нибудь помочь мне исправить это.

Спасибо.