EarlyDude

i found out the answer,can this post be delleted please ?

I am trying to change the class of a button if a conditon is not met ( if(strlen($username) < 5) ) this is my code : <?php $buttonClass = 'btn btn-primary'; ?> <?php if(isset($_POST['name']) && $_POST['name'] != ""){ $username = preg_replace('#[^a-z0-9]#i', '', $_POST['name']); $quer = "SELECT * FROM users WHERE username = '$username'"; $resu = mysqli_query($dbc,$quer); $check = mysqli_num_rows($resu); if(strlen($username) < 5){ echo '<span class = "glyphicon glyphicon-remove" style = "color:red"> More then 4 caracters </span>'; $buttonClass = 'btn btn-primary disabled'; exit(); } elseif(is_numeric($username[0])){ echo '<span class = "glyphicon glyphicon-remove" style = "color:red"> First character mst be a letter </span>'; $buttonClass = 'btn btn-primary disabled'; exit(); } elseif($check < 1){ echo '<span class = "glyphicon glyphicon-ok" style = "color:green"> ' . $username . ' is available</span>'; }else{ echo '<span class = "glyphicon glyphicon-remove" style = "color:red"> This username is already taken </span>'; $buttonClass = 'btn btn-primary disabled'; exit(); } } ?> <script type="text/javascript" language = "javascript"> function checkUsername () { var status = document.getElementById("usernamestatus"); var u = document.getElementById("username").value; if(u != "") { status.innerHTML = 'Se verifica...'; var hr = new XMLHttpRequest(); hr.open("POST","register.php",true); hr.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); hr.onreadystatechange = function(){ if(hr.readyState == 4 && hr.status == 200){ status.innerHTML = hr.responseText; } } var v = "name="+u; hr.send(v); } } </script> AND this is my html(under the php and the script) <div class="form-group"> <label for="username" class="col-lg-2 control-label">Username:</label> <div class="col-lg-10"> <input type="text" name = "username" class="form-control" id="username" onkeyup="checkUsername()"> <br><div class = "userspan"> <span style = "font-size:15px"id = "usernamestatus"></span> </div> </div> </div> <button type="reset" class="btn btn-default">Cancel</button> <button type="submit" class="<?php echo $buttonClass ?>" id = "submit" >Submit</button> Now i know there is something to do with the exit() function but if i don't put it then the html apears on the page twice,how can i stop that from happening ? Please can someone help ?