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Click to See Complete Forum and Search --> : validation script - modify for alpha & num check

leeolive
11-04-2003, 08:01 AM
Hi

I have found script which doesn't use alerts (from Javascript Source). It checks for empty, and min and max no of characters and email. I am trying to add functionality to check for alpha characters and then also for numeric. Could someone please help me with this as I am new to JavaScript? I think it's the syntax.. I got the script from here http://javascript.internet.com/forms/val-no-alert.html

I guess it would be something like this for alpha
(f.MaidenName.value !=("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-'") ???

I have this so far

<html>
<head><title></title>

<SCRIPT LANGUAGE="JavaScript">
<!-- Original: Jeff Harding (jbh@site-ations.com) -->
<!-- Web Site: http://www.site-ations.com -->
<!-- Modified by: Ronnie T. Moore, Editor -->

<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->

<!-- Begin
// Preload images
var empty = new Image(); empty.src = "images/fieldempty.gif";
var email = new Image(); email.src = "images/emailerror.gif";
var zipcd = new Image(); zipcd.src = "images/ziperror.gif";
var phone = new Image(); phone.src = "images/phoneerror.gif";

var haveerrors = 0;
function showImage(imagename, imageurl, errors) {
document[imagename].src = imageurl;
if (!haveerrors && errors) haveerrors = errors;
}

function validateForm(f) {
haveerrors = 0;
(f.fname.value.length < 1) // validate first name length
? showImage("firstnameerror", "fieldempty.gif", true) // no semi-colon after this line!
: showImage("firstnameerror", "blankimage.gif", false); // true = errors, false = no errors

(f.lname.value.length < 1) // validate last name length
? showImage("lastnameerror", "fieldempty.gif", true)
: showImage("lastnameerror", "blankimage.gif", false);

(f.zip.value.length != 5) // validate zip code length
? showImage("ziperror", "ziperror.gif", true)
: showImage("ziperror", "blankimage.gif", false);

phonenumlength = f.area.value.length +
f.exchange.value.length + f.number.value.length;

(phonenumlength != 10) // validate phone number length
? showImage("phoneerror", "phoneerror.gif", true)
: showImage("phoneerror", "blankimage.gif", false);

(f.email.value.search("@") == -1 || f.email.value.search("[.*]") == -1) // validate email
? showImage("emailerror", "emailerror.gif", true)
: showImage("emailerror", "blankimage.gif", false);

return (!haveerrors);
}
// End -->
</script>

</head>
<body>

<center>
<form action="script.cgi" name="myform" onSubmit="return validateForm(this)">
<table border=0 cellspacing=0 celpadding=0>
<tr>
<td colspan=2>Enter your information:<br>
<sup>(<font color="#ff0000">*</font> denotes required field).</sup></td>
</tr>
<tr>
<td><p align=right>
First Name:</td>
<td>
<input type=text name="fname" size=25 maxlength=50><font color="#ff0000">*</font><br>
<img name=firstnameerror src="blankimage.gif" width=350 height=10 border=0></td>
</tr>
<tr>
<td><p align=right>
Last Name:</td>
<td>
<input type=text name="lname" size=25 maxlength=50><font color="#ff0000">*</font><br>
<img name=lastnameerror src="blankimage.gif" width=350 height=10 border=0></td>
</tr>
<tr>
<td><p align=right>
Zip Code:</td>
<td>
<input type=text name=zip size=25 maxlength=50><font color="#ff0000">*</font><br>
<img name=ziperror src="blankimage.gif" width=350 height=10 border=0></td>
</tr>
<tr>
<td><p align=right>
Email:</td>
<td>
<input type=text name=email size=25 maxlength=50><font color="#ff0000">*</font><br>
<img name=emailerror src="blankimage.gif" width=350 height=10 border=0></td>
</tr>
<tr>
<td><p align=right>
Phone:</td>
<td>
<input type=text name=area size=4 maxlength=5>-
<input type=text name=exchange size=4 maxlength=3>-
<input type=text name=number size=5 maxlength=4><font color="#ff0000">*</font><br>
<img name=phoneerror src="blankimage.gif" width=350 height=10 border=0></td>
</tr>
<tr>
<td colspan=2><p align=center>
<hr>
</td>
</tr>
<tr>
<td><p align=center>
</td>
<td><p align=right>
<input type=submit value="Submit Form"></td>
</tr>
</table>
</form>
</center>

<p><center>
<font face="arial, helvetica" size="-2">Free JavaScripts provided<br>
by <a href="http://javascriptsource.com">The JavaScript Source</a></font>
</center><p>

</body>
</html>


Thanks for your help!
Lee
Charles
11-04-2003, 02:18 PM
For an email address use something like:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta name="Content-Script-Type" content="text/javascript">
<title>Example</title>

<style type="text/css">
<!--
label {display:block; margin:1em 0em}
input {display:block}
-->
</style>

<script type="text/javascript">
<!--
String.prototype.isEmailAddress = function () {return this.match(/^[^\x00-\x20()<>@,;:\\".[\]\x7f-\xff]+(?:\.[^\x00-\x20()<>@,;:\\".[\]\x7f-\xff]+)*\@[^\x00-\x20()<>@,;:\\".[\]\x7f-\xff]+(?:\.[^\x00-\x20()<>@,;:\\".[\]\x7f-\xff]+)+$/)}
// -->
</script>

<form action="">
<div>
<label>Email Address<input type="text" onchange="if (!this.value.isEmailAddress()) {alert('That would not appear to be a valid address.'); this.value=''; this.focus()}"></label>
<button type="submit">Submit</button>
</div>
</form>

For the rest use Regular Expressions (http://devedge.netscape.com/library/manuals/2000/javascript/1.3/guide/regexp.html).