01.<html>
02.<head>
03.<script type="text/javascript">
04.function show_prompt()
05.{
06.
07.
08.var name=prompt("Please enter your name","Harry Potter");
09.if (name!=null && name!="" && name.length<="3")
10. {
11. document.write("<p>Hello " + name + "! How are you today?</p>");
12. }else{
13. alert("กรอกได้ 3 ตัวอักษร");
14. }
15.}
16.</script>
17.</head>
18.<body>
19.
20.<input type="button" onclick="show_prompt()" value="Show prompt box" />
21.
22.</body>
23.</html>
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