Zange-chan Zange-chan - 1 year ago 67
Ajax Question

Passing values from ajax to php class functions

Q. Is there a way to pass values from ajax to a certain php class having functions? Let's say validating a username on the registration form whether the user exist or not.

This is a simple form that will accept username and has a span tag to display the message.

<form action="" method="POST">
<input type="text" name="username"><span class="check"></span>
<input type="submit" name="signup">

And for the php class:

class User {
function isUserExist($username) {
$query = mysql_query("SELECT username FROM users WHERE username='$username'");
$result = mysql_num_rows($query);

return ($result !== 0 ? true : false);

It is initialized on the php class that established connection to the database.
So calling to the php page will become like this: $user->isUserExist($_POST['username']);.

So is it possible to pass values from the form to ajax and send it to the php class function?

Answer Source

From Html to ajax

var username = $("input[name='username']").value;

Fetch in ajax & Send it to php(server)

  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (xhttp.readyState == 4 && xhttp.status == 200) {
      //set your span to this -> xhttp.responseText;
  };"POST", "your php script url", true);

Receive it on the server(php)

$mUsername = $_POST['username'];
echo $mUsername;

Read this tutorial for more help Tutorial on PHP + AJAX

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