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>
</html> | DISCLAIMER: The content provided in this article is not warranted or guaranteed by Developer Shed, Inc. The content provided is intended for entertainment and/or educational purposes in order to introduce to the reader key ideas, concepts, and/or product reviews. As such it is incumbent upon the reader to employ real-world tactics for security and implementation of best practices. We are not liable for any negative consequences that may result from implementing any information covered in our articles or tutorials. If this is a hardware review, it is not recommended to open and/or modify your hardware. |
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