basic problem im sure

ldb358 · June 26, 2009

hi i am working on a very basic ajax script but for some reason its not working the script is simply put check if a username is a available so that the user doesn't have to submit the whole form to know is the username is available

heres the html script:

<html>
<head>
<link href='smartform.css' type='text/css' rel='stylesheet'/>
<script src='smartform.js' type='text/javascript'></script>
</head>
<body>
<form>
username:<input type='text' id='username' onchange='checkUsername()'/><div id="cUsername"></div><br/>
password:<input type='text' id='password'/><br/>
confirm password:<input type='text' id='vPassword'/><br/>
first name:<input type='text' id='fName'/><br/>
last name:<input type='text' id='lName'/><br/>
email:<input type='text' id='email'/><br/>
<input type='submit' value='register' />
</form>
</body>
</html>

now the javascript file:

var xmlhttp = newHttpObject();
function checkUsername(){
var username = document.getElementById("username").value;
var div1 = document.getElementById("cUsername");
sendUsername(username);
if(xmlhttp == null){
div1.innerHTML = "";
}

}
function sendUsername(username){
	var url = "http://lbflash.summerhost.info/smartform.php?username=" + username;
	var type = "GET";
	xmlhttp.open(type,url,true);
	xmlhttp.onreadystatechange = response;
	xmlhttp.send(null);

}
function response(){

	if(xmlhttp.readyState == 4){
if(xmlhttp.responseText > "0"){
	div1.innerHTML = "<img src='x.png' 			style='margin-left:5px;margin-right:5px;'/>taken";
	}else if(xmlhttp.responseText == "0"){
	div1.innerHTML = "<img src='checkmark.png' 	style='margin-left:5px;margin-right:5px;'/>not taken";
	}
}
}
function newHttpObject(){
	if (window.XMLHttpRequest){
  		return new XMLHttpRequest();
  		}	
	if (window.ActiveXObject){
		return new ActiveXObject("Microsoft.XMLHTTP");
	}else{
	return null;
	}
}

now the php file:

<?php
include('db.php');
$username = $_REQUEST['username'];
$check = mysql_query("SELECT * FROM users WHERE username='$username'");
$results = mysql_num_rows($check);
echo $results;
?>

whats wrong?

Thanks in advanced

xtopolis · June 27, 2009

Where does it stop? What is the error / not working part? At a glance, a problem might arise:

   if(xmlhttp.responseText > "0"){

at that line. You may want to convert the responseText to an integer, and then use > 0 rather than > "0";

Be more specific about what part doesn't work in order to save us time.

$username = $_REQUEST['username'];

Also you may want to sanitize your inputs (mysql_esape_real_string)

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basic problem im sure

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