01.<html>
02. <head>
03. <meta http-equiv="Content-Type" content="text/html; charset=windows-874" />
04. <title> test </title>
05.<script language="javascript">
06. function Chk(intLength)
07. {
08. if(parseInt(intLength) != 2)
09. {
10. alert("กรอกข้อมูลให้ครบ 2 ตัวอักษร");
11. document.frm.text1.focus();
12. }else{
13. alert("สำเร็จ");
14. }
15. }
16.</script>
17. </head>
18. <body>
19. <form name="frm" id="frm" method="post" action="">
20. Input : <input type="text" name="text1" maxlength="2">
21. <input type="button" value="save" onclick="Chk(text1.value.length);">
22. </form>
23. </body>
24.</html>
