Passing values from ajax to php class functions

Question

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">
</form>

And for the php class:

<?php 
  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?

cafebabe1991 · Accepted Answer · 2016-06-23 03:29:23Z

1

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;
    }
  };
  xhttp.open("POST", "your php script url", true);
  xhttp.send("username="+username);

Receive it on the server(php)

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

Read this tutorial for more help Tutorial on PHP + AJAX

edited Jun 23, 2016 at 3:29

answered May 31, 2016 at 3:32

cafebabe1991

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8 Comments

Cookie Ninja Over a year ago

Can you give me some explanation with this? I'm still quite new about ajax.

cafebabe1991 Over a year ago

read about it on w3schools. Pretty simple and neat explanation. What are we doing here is : We create a request XmlHttpRequest , wait for a change in that change status (readyState == 200 means good to go). then we put params and send it using send method.

Cookie Ninja Over a year ago

I've tried it. But how to call the function inside the class? I declare the $username = $_POST['username']; before the class to make it global but it says that the username is undefined.

Cookie Ninja Over a year ago

Function isUserExist($username) inside my User() class. Also inside a class has many functions, I also have a php file with 2 classes. So how can I access a specific class and a specific function?

cafebabe1991 Over a year ago

I would suggest you to look at php tutorial for this. In general if a class has a function, calling a function from that class requires you to create that class first and get an object and call a method on it. But do look at some php tutorial on w3schools to help you with that.

|

mujuonly · Accepted Answer · 2016-05-31 06:15:45Z

0

Try this,

<script type="text/javascript">
$(document).ready(function(){
    $("input[name = 'signup']").click(function(e) {
        var username = $("input[name = 'username']").val();
        $.ajax ({
            url: "isUserExist_function_existing_file.php", 
            data: { username : username },
            success: function( result ) {
                if(result)
                    alert("Name allready Exist");
                else
                    alert("Name available");
            }
        });
    });
});
</script>

answered May 31, 2016 at 6:15

mujuonly

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4 Comments

Cookie Ninja Over a year ago

The name of the file is user.php. How can I access the function isUserExist($username) of the class User();? There are many more functions inside the class, so how can I call the specific function?

mujuonly Over a year ago

Are you able to access the function like url: "user/isUserExist", or Try if(isset( $_POST['username'] )) { $user = new user(); $result = $user->isUserNameExist($_POST['username']); return $result; }

Cookie Ninja Over a year ago

I don't think it will work since the path of the php file is needed. Calling the function inside the class is what I need.

mujuonly Over a year ago

Ajax should have some endpoint URL that can access public eg:- facebook.com/chat/user_info/?dpr=1 Are you using any Framework?

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