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// form.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Simple HTML Form</title>
    <link rel="stylesheet" href="style.css">
    <script src="validator.js"></script>
</head>
<body>
<form name="contactForm" onsubmit="return validateForm()" action="confirmation.php" method="post">
    <h2>Application Form</h2>
    <div class="row">
        <label>Full Name</label>
        <input type="text" name="name">
        <div class="error" id="nameErr"></div>
    </div>
    <div class="row">
        <label>Email Address</label>
        <input type="text" name="email">
        <div class="error" id="emailErr"></div>
    </div>
    <div class="row">
        <label>Mobile Number</label>
        <input type="text" name="mobile" maxlength="10">
        <div class="error" id="mobileErr"></div>
    </div>
    <div class="row">
        <label>Country</label>
        <select name="country">
            <option>Select</option>
            <option>Australia</option>
            <option>India</option>
            <option>United States</option>
            <option>United Kingdom</option>
        </select> 
        <div class="error" id="countryErr"></div>
    </div>
    <div class="row">
        <label>Gender</label>
        <div class="form-inline">
            <label><input type="radio" name="gender" value="male"> Male</label>
            <label><input type="radio" name="gender" value="female"> Female</label> 
        </div>
        <div class="error" id="genderErr"></div>
    </div>
    <div class="row">
        <label>Hobbies <i>(Optional)</i></label>
        <div class="form-inline">
            <label><input type="checkbox" name="hobbies[]" value="sports"> Sports</label>
            <label><input type="checkbox" name="hobbies[]" value="movies"> Movies</label>
            <label><input type="checkbox" name="hobbies[]" value="music"> Music</label>  
        </div>
    </div>        
    <div class="row">
        <input type="submit" value="Submit">
    </div>
</form>
</body>
</html>



//style.css

body {
    font-size: 16px;
    background: #f9f9f9;
    font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}
h2 {
    text-align: center;
    text-decoration: underline;
}
form {
    width: 300px;
    background: #fff;
    padding: 15px 40px 40px;
    border: 1px solid #ccc;
    margin: 50px auto 0;
    border-radius: 5px;
}
label {
    display: block;
    margin-bottom: 5px
}
label i {
    color: #999;
    font-size: 80%;
}
input, select {
    border: 1px solid #ccc;
    padding: 10px;
    display: block;
    width: 100%;
    box-sizing: border-box;
    border-radius: 2px;
}
.row {
    padding-bottom: 10px;
}
.form-inline {
    border: 1px solid #ccc;
    padding: 8px 10px 4px;
    border-radius: 2px;
}
.form-inline label, .form-inline input {
    display: inline-block;
    width: auto;
    padding-right: 15px;
}
.error {
    color: red;
    font-size: 90%;
}
input[type="submit"] {
    font-size: 110%;
    font-weight: 100;
    background: #006dcc;
    border-color: #016BC1;
    box-shadow: 0 3px 0 #0165b6;
    color: #fff;
    margin-top: 10px;
    cursor: pointer;
}
input[type="submit"]:hover {
    background: #0165b6;
}


//validator.js

// Defining a function to display error message
function printError(elemId, hintMsg) {
    document.getElementById(elemId).innerHTML = hintMsg;
}

// Defining a function to validate form 
function validateForm() {
    // Retrieving the values of form elements 
    var name = document.contactForm.name.value;
    var email = document.contactForm.email.value;
    var mobile = document.contactForm.mobile.value;
    var country = document.contactForm.country.value;
    var gender = document.contactForm.gender.value;
    var hobbies = [];
    var checkboxes = document.getElementsByName("hobbies[]");
    for(var i=0; i < checkboxes.length; i++) {
        if(checkboxes[i].checked) {
            // Populate hobbies array with selected values
            hobbies.push(checkboxes[i].value);
        }
    }
    
	// Defining error variables with a default value
    var nameErr = emailErr = mobileErr = countryErr = genderErr = true;
    
    // Validate name
    if(name == "") {
        printError("nameErr", "Please enter your name");
    } else {
        var regex = /^[a-zA-Z\s]+$/;                
        if(regex.test(name) === false) {
            printError("nameErr", "Please enter a valid name");
        } else {
            printError("nameErr", "");
            nameErr = false;
        }
    }
    
    // Validate email address
    if(email == "") {
        printError("emailErr", "Please enter your email address");
    } 
    else {
        //Regular expression for basic email validation
        var regex = /^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$/;
        if(regex.test(email) === false) {
            printError("emailErr", "Please enter a valid email address");
        } else{
            printError("emailErr", "");
            emailErr = false;
        }
    }   

    // Validate mobile number
    if(mobile == "") {
        printError("mobileErr", "Please enter your mobile number");
    } else {
        var regex = /^[1-9]\d{9}$/;
        if(regex.test(mobile) === false) {
            printError("mobileErr", "Please enter a valid 10 digit mobile number");
        } else{
            printError("mobileErr", "");
            mobileErr = false;
        }
    }
    
    // Validate country
    if(country == "Select") {
        printError("countryErr", "Please select your country");
    } else {
        printError("countryErr", "");
        countryErr = false;
    }
    
    // Validate gender
    if(gender == "") {
        printError("genderErr", "Please select your gender");
    } else {
        printError("genderErr", "");
        genderErr = false;
    }
    
    // Prevent the form from being submitted if there are any errors
    if((nameErr || emailErr || mobileErr || countryErr || genderErr) == true) {
       return false;
    } else {
        // Creating a string from input data for preview
        var dataPreview = "You've entered the following details: \n" +
                          "Full Name: " + name + "\n" +
                          "Email Address: " + email + "\n" +
                          "Mobile Number: " + mobile + "\n" +
                          "Country: " + country + "\n" +
                          "Gender: " + gender + "\n";
        if(hobbies.length) {
            dataPreview += "Hobbies: " + hobbies.join(", ");
        }
        // Display input data in a dialog box before submitting the form
        alert(dataPreview);
    }
};