demo_ajax_php.php:
<!DOCTYPE html> <html> <head> <script> function showHint(str) { if (str.length == 0) { document.getElementById("txtHint").innerHTML = ""; return; } else { var xmlhttp = new XMLHttpRequest(); xmlhttp.onreadystatechange = function() { if (this.readyState == 4 && this.status == 200) { document.getElementById("txtHint").innerHTML = this.responseText; } } xmlhttp.open("GET", "gethint.php?q="+str, true); xmlhttp.send(); } } </script> </head> <body> <p><b>Start typing a name in the input field below:</b></p> <form action=""> <label for="fname">First name:</label> <input type="text" id="fname" name="fname" onkeyup="showHint(this.value)"> </form> <p>Suggestions: <span id="txtHint"></span></p> </body> </html>