A how-to code example from ASPFree. <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>
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