I have an existing Contact Form that I got through the StartBoostrap template called Freelancer... It uses Javascript and sends that information via PHP file to my email.
EDIT : For the record I am not experienced in what I am about to do.
I want to add a checkbox option so people can let me know if they'd like to be put on a newsletter list... I am not a JS/PHP person, strictly front end.... I've gone through this and this but I can't seem to get them to work within my existing constraints and have the email show if the box was checked or not.
Here is my HTML :
<form name="sentMessage" id="contactForm" novalidate>
                        <div class="row control-group">
                            <div class="form-group col-xs-12 floating-label-form-group controls">
                                <label>Name</label>
                                <input type="text" class="form-control" placeholder="Name" id="name" required data-validation-required-message="Please enter your name.">
                                <p class="help-block text-danger"></p>
                            </div>
                        </div>
                        <div class="row control-group">
                            <div class="form-group col-xs-12 floating-label-form-group controls">
                                <label>Email Address</label>
                                <input type="email" class="form-control" placeholder="Email Address" id="email" required data-validation-required-message="Please enter your email address.">
                                <p class="help-block text-danger"></p>
                            </div>
                        </div>
                        <div class="row control-group">
                            <div class="form-group col-xs-12 floating-label-form-group controls">
                                <label>Phone Number</label>
                                <input type="tel" class="form-control" placeholder="Phone Number" id="phone" required data-validation-required-message="Please enter your phone number.">
                                <p class="help-block text-danger"></p>
                            </div>
                        </div>
                        <div class="row control-group">
                            <div class="form-group col-xs-12 floating-label-form-group controls">
                                <label>You've got questions, we've got answers!</label>
                                <textarea rows="5" class="form-control" placeholder="Message" id="message" required data-validation-required-message="We will answer your questions ASAP!"></textarea>
                                <p class="help-block text-danger"></p>
                            </div>
                        </div>
                        <br>
                        <div id="success"></div>
                        <div class="row">
                            <div class="form-group col-xs-6">
                               <button type="submit" class="btn-contact btn-lg hover">SEND</button>
                            <div class="checkbox-inline">
                            <label><input type="checkbox" id="mail_list_checkbox">Join our mailing list!</label>
                            </div>      
                         </div>
                    </form>
Here is my JS :
    $(function() {
    $("input,textarea").jqBootstrapValidation({
        preventSubmit: true,
        submitError: function($form, event, errors) {
            // additional error messages or events
        },
        submitSuccess: function($form, event) {
            // Prevent spam click and default submit behaviour
            $("#btnSubmit").attr("disabled", true);
            event.preventDefault();
            // get values from FORM
            var name = $("input#name").val();
            var email = $("input#email").val();
            var phone = $("input#phone").val();
            var message = $("textarea#message").val();
            var firstName = name; // For Success/Failure Message
            // Check for white space in name for Success/Fail message
            if (firstName.indexOf(' ') >= 0) {
                firstName = name.split(' ').slice(0, -1).join(' ');
            var checkbox = $("#mail_list_checkbox").val();
            $('#mail_list_checkbox').val();
            if ($('#mail_list_checkbox').is(":checked"))
            {
            // it is checked
            }
            }
            $.ajax({
                url: "././mail/contact_me.php",
                type: "POST",
                data: {
                    name: name,
                    phone: phone,
                    email: email,
                    message: message,
                    checkbox: checkbox
                },
                cache: false,
                success: function() {
                    // Enable button & show success message
                    $("#btnSubmit").attr("disabled", false);
                    $('#success').html("<div class='alert alert-success'>");
                    $('#success > .alert-success').html("<button type='button' class='close' data-dismiss='alert' aria-hidden='true'>×")
                        .append("</button>");
                    $('#success > .alert-success')
                        .append("<strong>Your message has been sent. </strong>");
                    $('#success > .alert-success')
                        .append('</div>');
                    //clear all fields
                    $('#contactForm').trigger("reset");
                },
                error: function() {
                    // Fail message
                    $('#success').html("<div class='alert alert-danger'>");
                    $('#success > .alert-danger').html("<button type='button' class='close' data-dismiss='alert' aria-hidden='true'>×")
                        .append("</button>");
                    $('#success > .alert-danger').append("<strong>Sorry " + firstName + ", it seems that my mail server is not responding. Please try again later!");
                    $('#success > .alert-danger').append('</div>');
                    //clear all fields
                    $('#contactForm').trigger("reset");
                },
            })
        },
        filter: function() {
            return $(this).is(":visible");
        },
    });
    $("a[data-toggle=\"tab\"]").click(function(e) {
        e.preventDefault();
        $(this).tab("show");
    });
});
// When clicking on Full hide fail/success boxes
$('#name').focus(function() {
    $('#success').html('');
});
Here is the PHP :
<?php
// Check for empty fields
if(empty($_POST['name'])        ||
   empty($_POST['email'])       ||
   empty($_POST['phone'])       ||
   empty($_POST['message']) ||
   empty($_POST['checkbox'])    ||
   !filter_var($_POST['email'],FILTER_VALIDATE_EMAIL))
   {
    echo "No arguments Provided!";
    return false;
   }
$name = $_POST['name'];
$email_address = $_POST['email'];
$phone = $_POST['phone'];
$message = $_POST['message'];
$message = $_POST['checkbox'];
// Create the email and send the message
$to = 'me@mywebsite.com'; // Add your email address inbetween the '' replacing yourname@yourdomain.com - This is where the form will send a message to.
$email_subject = "Website Contact Form:  $name";
$email_body = "Hey!! You have received a new message from your website contact form.\n\n"."Here are the details:\n\nName: $name\n\nEmail: $email_address\n\nPhone: $phone\n\nMessage:\n$message\n\nDo they want to join the mailing list: $checkbox";
$headers = "From: me@mywebsite.com\n"; // This is the email address the generated message will be from. We recommend using something like noreply@yourdomain.com.
$headers .= "Reply-To: $email_address"; 
mail($to,$email_subject,$email_body,$headers);
return true;            
?>
Thank you for your time.
 
     
    