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<!DOCTYPE html> <html> <body> <form action=""> <select name="customers" onchange="showCustomer(this.value)"> <option value="">Select a customer:</option> <option value="ALFKI">Alfreds Futterkiste</option> <option value="NORTS ">North/South</option> <option value="WOLZA">Wolski Zajazd</option> </select> </form> <p id="demo">Customer info will be listed here...</p> <script> function showCustomer(str) { var xmlhttp; if (str == "") { document.getElementById("demo").innerHTML = ""; return; } xmlhttp = new XMLHttpRequest(); xmlhttp.onreadystatechange = function() { if (xmlhttp.readyState == 4 && xmlhttp.status == 200) { document.getElementById("demo").innerHTML = xmlhttp.responseText; } }; xmlhttp.open("GET", "getcustomer.asp?q="+str, true); xmlhttp.send(); } </script> </body> </html>