<?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>hello....
i want to do the validations in registration form. but my validation is when the user enters the value in textbox that value automatically cheks that value is already in database or not.
for example..........username textbox is there..now i am entering value first three letter "kal" then comes beside the textbox "username 'kal' is available for you". and next i am entering nextletter "kalp" then comes beside the textbox "kalp is available". plz help me.....any chances to do this task.
