Tryit Editor v1.8

Source Code:
<!DOCTYPE html> <html> <head> <script> function showCustomer(str) { var xmlhttp; if (str=="") { document.getElementById("txtHint").innerHTML=""; return; } 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","getcustomer.aspq.htm"+str,true); xmlhttp.send(); } </script> </head> <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> <br> <div id="txtHint">Customer info will be listed here...</div> </body> </html>
Result:
W3Schools.com - Try it yourself