Código HTML:
<script type="text/javascript">
function showT(fic) {
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
} else {
// code for IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
document.getElementById("txtHint").innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open("GET","127.0.0.1/getF.php?q="+fic,true);
xmlhttp.send();
}
</script>
<form>
<input type="text" onkeypress="showT(this)">
<input type="submit">
</form>
getF.php
Código PHP:
<?php
echo $q = $_GET['q'];
?>