<html> <head> <title>Form Validation Using JavaScript</title> <script LANGUAGE="JavaScript"> <!-- Hides Code function validateIt() //function is called when the button is clicked { var dblNum; var txtText; var txtMessage; dblNum = 0.1; if(!isNaN(document.form1.txtNum.value)) /* document.[form name].[field name].value Checks to see if it is a number (isNaN: Not a Number) */ { dblNum = document.form1.txtNum.value; /* alerts display message boxes */ } else { alert("Field must contain a number"); document.form1.txtNum.focus(); return; } txtText = document.form1.txtText.value; if(!isNaN(document.form1.txtText.value)) { alert("Requires text, and not a number"); document.form1.txtText.focus(); return; } if(txtText.length < 8) /* checks to see if the lenght of the text field is greater than 8 */ { alert("Text must be at least 8 letters long"); document.form1.txtText.focus(); return; } if(dblNum < 250.55) /* makes sure that the number entered meets the criteria */ { alert("Number must be greater than 250.55") document.form1.txtNum.focus(); return; } alert("Everything Checks Out Fine") return; } //--> </script> </head> <body background="../images/aspfreebkgrnd.gif"> <p>How to validate a form entry using javascript:</p> <form method="POST" name="form1" action="javaform.asp" webbot-action="--WEBBOT-SELF--"> <div align="center"> <center> <table border="0" cellpadding="0" cellspacing="0" width="44%"> <tr> <td width="41%">Text of 8 letters: </td> <td width="59%"><input type="text" name="txtText" size="20"></td> </tr> <tr> <td width="41%">Number > 250.55</td> <td width="59%"><input type="text" name="txtNum" size="20"></td> </tr> <tr> <td width="41%" colspan="2"> <p align="center"><input type="button" value="Button" name="B1" onClick="validateIt();"></td></tr> </table> </center> </div> </form> </body> </html>
Windows Scripting 
Writing Portable Scripts in WSH
