<?php
ob_start();
extract($_REQUEST);
extract($_POST);
session_start();
$con = mysql_connect("localhost","root","");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
$db=mysql_select_db('murali',$con);
$message = '';
$error = array();
$select=mysql_query("select * from registration where username='$_REQUEST[username]'");
$taken_usernames=mysql_fetch_array($select);
// main submit logic
if (@$_REQUEST['action'] == 'register') {
$resp = check_username($_REQUEST['username']);
if ($resp['ok']) {
$message = 'All details fine';
} else {
$message = 'There was a problem with your registration details';
$error = $resp;
}
} else if (@$_REQUEST['action'] == 'check_username' && isset($_SERVER['HTTP_X_REQUESTED_WITH'])) {
// means it was requested via Ajax
echo json_encode(check_username($_REQUEST['username']));
exit; // only print out the json version of the response
}
function check_username($username) {
global $taken_usernames;
$resp = array();
$username = trim($username);
if (!$username) {
$resp = array('ok' => false, 'msg' => "Please specify a username");
} else if (!preg_match('/^[a-z0-9\.\-_]+$/', $username)) {
$resp = array('ok' => false, "msg" => "Your username can only contain alphanumerics and period, dash and underscore (.-_)");
} else if (in_array($username, $taken_usernames)) {
$resp = array("ok" => false, "msg" => "The selected username is not available");
} else {
$resp = array("ok" => true, "msg" => "This username is free");
}
return $resp;
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Ajax - PHP example</title>
</head>
<body>
<script language="javascript" type="text/javascript">
<!--
// Get the HTTP Object
function getHTTPObject(){
if (window.ActiveXObject) return new ActiveXObject("Microsoft.XMLHTTP");
else if (window.XMLHttpRequest) return new XMLHttpRequest();
else {
alert("Your browser does not support AJAX.");
return null;
}
}
// Change the value of the outputText field
function setOutput(){
if(httpObject.readyState == 4){
document.getElementById('outputText').value = httpObject.responseText;
}
}
// Implement business logic
function doWork(){
httpObject = getHTTPObject();
if (httpObject != null) {
httpObject.open("GET", "upperCase.php?inputText="
+document.getElementById('inputText').value, true);
httpObject.send(null);
httpObject.onreadystatechange = setOutput;
}
}
var httpObject = null;
//-->
</script>
<form name="testForm">
Input text: <input type="text" onkeyup="doWork();" name="inputText" id="inputText" />
Output text: <input type="text" name="outputText" id="outputText" />
</form>
</body>
</html>.actually i am doing registration form validation in ajax. if username is already in database give an error. when user enters the username in textbox that will automatically checks it is in database or not.....with out submiting the form. in the above code array values are not passing into variable. below is that code.
$select=mysql_query("select * from registration where username='$_REQUEST[username]'");
$taken_usernames=mysql_fetch_array($select);