Form submit with AJAX passing form data to PHP without page refresh

Question

Can anyone tell me why this bit of code isn\'t working?

Answer 1

JS Code

    $("#submit").click(function() { 
    //get input field values
    var name            = $('#name').val(); 
    var email           = $('#email').val();
    var message         = $('#comment').val();
    var flag = true;
    /********validate all our form fields***********/
    /* Name field validation  */
    if(name==""){ 
        $('#name').css('border-color','red'); 
        flag = false;
    }
    /* email field validation  */
    if(email==""){ 
        $('#email').css('border-color','red'); 
        flag = false;
    } 
    /* message field validation */
    if(message=="") {  
       $('#comment').css('border-color','red'); 
        flag = false;
    }
    /********Validation end here ****/
    /* If all are ok then we send ajax request to email_send.php *******/
    if(flag) 
    {
        $.ajax({
            type: 'post',
            url: "email_send.php", 
            dataType: 'json',
            data: 'username='+name+'&useremail='+email+'&message='+message,
            beforeSend: function() {
                $('#submit').attr('disabled', true);
                $('#submit').after('<span class="wait">&nbsp;<img src="image/loading.gif" alt="" /></span>');
            },
            complete: function() {
                $('#submit').attr('disabled', false);
                $('.wait').remove();
            },  
            success: function(data)
            {
                if(data.type == 'error')
                {
                    output = '<div class="error">'+data.text+'</div>';
                }else{
                    output = '<div class="success">'+data.text+'</div>';
                    $('input[type=text]').val(''); 
                    $('#contactform textarea').val(''); 
                }

                $("#result").hide().html(output).slideDown();           
                }
        });
    }
});
//reset previously set border colors and hide all message on .keyup()
$("#contactform input, #contactform textarea").keyup(function() { 
    $("#contactform input, #contactform textarea").css('border-color',''); 
    $("#result").slideUp();
});

HTML Form

<div  class="cover">
<div id="result"></div>
<div id="contactform">
    <p class="contact"><label for="name">Name</label></p>
    <input id="name" name="name" placeholder="Yourname" type="text">

    <p class="contact"><label for="email">Email</label></p>
    <input id="email" name="email" placeholder="admin@admin.com" type="text">

    <p class="contact"><label for="comment">Your Message</label></p>
    <textarea name="comment" id="comment" tabindex="4"></textarea> <br>
    <input name="submit" id="submit" tabindex="5" value="Send Mail" type="submit" style="width:200px;">
</div>

PHP Code

if ($_SERVER['REQUEST_METHOD'] == 'POST') {

//check if its an ajax request, exit if not
if (!isset($_SERVER['HTTP_X_REQUESTED_WITH']) AND strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) != 'xmlhttprequest') {

    //exit script outputting json data
    $output = json_encode(
            array(
                'type' => 'error',
                'text' => 'Request must come from Ajax'
    ));

    die($output);
}

//check $_POST vars are set, exit if any missing
if (!isset($_POST["username"]) || !isset($_POST["useremail"]) || !isset($_POST["message"])) {
    $output = json_encode(array('type' => 'error', 'text' => 'Input fields are empty!'));
    die($output);
}

//Sanitize input data using PHP filter_var().
$username = filter_var(trim($_POST["username"]), FILTER_SANITIZE_STRING);
$useremail = filter_var(trim($_POST["useremail"]), FILTER_SANITIZE_EMAIL);
$message = filter_var(trim($_POST["message"]), FILTER_SANITIZE_STRING);

//additional php validation
if (strlen($username) < 4) { // If length is less than 4 it will throw an HTTP error.
    $output = json_encode(array('type' => 'error', 'text' => 'Name is too short!'));
    die($output);
}
if (!filter_var($useremail, FILTER_VALIDATE_EMAIL)) { //email validation
    $output = json_encode(array('type' => 'error', 'text' => 'Please enter a valid email!'));
    die($output);
}
if (strlen($message) < 5) { //check emtpy message
    $output = json_encode(array('type' => 'error', 'text' => 'Too short message!'));
    die($output);
}

$to = "info@wearecoders.net"; //Replace with recipient email address
//proceed with PHP email.
$headers = 'From: ' . $useremail . '' . "\r\n" .
        'Reply-To: ' . $useremail . '' . "\r\n" .
        'X-Mailer: PHP/' . phpversion();

$sentMail = @mail($to, $subject, $message . '  -' . $username, $headers);
//$sentMail = true;
if (!$sentMail) {
    $output = json_encode(array('type' => 'error', 'text' => 'Could not send mail! Please contact administrator.'));
    die($output);
} else {
    $output = json_encode(array('type' => 'message', 'text' => 'Hi ' . $username . ' Thank you for your email'));
    die($output);
}

This page has a simpler example http://wearecoders.net/submit-form-without-page-refresh-with-php-and-ajax/

Answer 2

$(document).ready(function(){
$('#userForm').on('submit', function(e){
        e.preventDefault();
//I had an issue that the forms were submitted in geometrical progression after the next submit. 
// This solved the problem.
        e.stopImmediatePropagation();
    // show that something is loading
    $('#response').html("<b>Loading data...</b>");

    // Call ajax for pass data to other place
    $.ajax({
    type: 'POST',
    url: 'somephpfile.php',
    data: $(this).serialize() // getting filed value in serialize form
    })
    .done(function(data){ // if getting done then call.

    // show the response
    $('#response').html(data);

    })
    .fail(function() { // if fail then getting message

    // just in case posting your form failed
    alert( "Posting failed." );

    });

    // to prevent refreshing the whole page page
    return false;

    });

Answer 3

Here is a nice plugin for jQuery that submits forms via ajax:

http://malsup.com/jquery/form/

its as simple as:

<script src="http://malsup.github.com/jquery.form.js"></script> 
<script> 
    $(document).ready(function() { 
        $('#myForm').ajaxForm(function() { 
           alert('form was submitted');
        }); 
    }); 
</script> 

It uses the forms action for the post location. Not that you can't achieve this with your own code but this plugin has worked very nicely for me!

Answer 4

type="button"

should be

type="submit"