tengo este primer scritp que es el formulario:
check_username.php
Código PHP:
<!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>
<script type="text/javascript" src="php_ajax_framework.js"></script>
<script type="text/javascript">
function check_username_init() {
var user_field = document.getElementById('user');
return 'username_exists.php?username=' + user_field.value;
}
function check_username_ajax(results) {
var results_div = document.getElementById('results_div');
results_div.innerHTML = results;
}
function check_username() {
var user_field = document.getElementById('user');
if (user_field.value.length > 0) {
//call our AJAX function in the PHP AJAX Framework
ajaxHelper('check_username');
}
else {
//clear results field
var results_div = document.getElementById('results_div');
results_div.innerHTML = '';
}
}
</script>
</head>
<body>
Username:
<input name="user" id="user" size="20" onKeyUp="check_username();">
<div id="results_div"></div>
</body>
</html>
aqui lleva la funcion ajax que valida con el keyup