Disable form submit with illegal words - Page 2

44 New Member

I need a script that can disable the submit button on a form or prevent the form from being submitted when there is an illegal word or character in the text box. This should prevent a spam bot from sending links to me via my website's contact me function. Here is the form that I need to protect:
[HTML]
<form id="FormName" action="thehand ler.cgi" method="post" name="FormName" >

<p>Name: /Naam: <input type="text" name="name" size="24" /></p>
<p>Email: /E-pos: <input type="text" name="email" size="24" /></p>
<p>Message: /Boodskap:<br />
<textarea name="message" rows="4" cols="30"></textarea></p>
<p><input type="submit" name="Submit/stuur" value="Submit/Stuur" /></p>
</form>
[/HTML]

The message textarea is the field that should be checked. Unnecessary text were removed.

Aug 11 '08

Subscribe Reply

2319

gits

5,390

Recognized Expert Moderator Expert

with the suggested regExp by acoder you could cut down the entire thing to the following simple function:

[HTML]<html>
<head>
<script type="text/javascript">
function check(node) {
var re = new RegExp('[<>\?\\[\\]]', 'g');
document.getEle mentById('mySub mit').disabled = re.test(node.va lue);
}
</script>
</head>
<form action="demo.ht ml">
<textarea onkeyup="check( this)">
</textarea>
<br/>
<input type="submit" value="submit" id="mySubmit"/>
</form>
</html>[/HTML]
kind regards

Aug 27 '08 #11

Jacotheron

New Member

with the suggested regExp by acoder you could cut down the entire thing to the following simple function:

[HTML]<html>
<head>
<script type="text/javascript">
function check(node) {
var re = new RegExp('[<>\?\\[\\]]', 'g');
document.getEle mentById('mySub mit').disabled = re.test(node.va lue);
}
</script>
</head>
<form action="demo.ht ml">
<textarea onkeyup="check( this)">
</textarea>
<br/>
<input type="submit" value="submit" id="mySubmit"/>
</form>
</html>[/HTML]

This form works now!

Thank You all for helping e solve this problem

Kind regards
Jacotheron

Aug 28 '08 #12

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