View Full Version : Enable/Disable Form Elements Help

10-15-2008, 06:44 PM
I currently have the following code in a page. (I've removed some of the stuff not critical to this question) I am attempting to keep the LinkOption box disabled (grayed) unless the user selects "ExternalLink" from the "required_commentnature" box.

Any help would be appreciated. Allen.

------>START CODE<------

<script language="Javascript"><!--
function enable_element ()
var x=document.getElementbyID("required_commentnature").selectedIndex
var y=document.GetElementsbyTagName("required_commentnature"[x].value
if y="ExternalLink" then (document.getElementbyID("LinkOption").disabled=false)


<title>Website Response Form</title>


<form method="POST" name="WebsiteCommentForm" action="--WEBBOT-SELF--" onSubmit="location.href='_derived/nortbots.htm';return false;" webbot-onSubmit>

<p style="margin-top: 0; margin-bottom: 4">Name:&nbsp;
<input type="text" name="required_Name" size="50" tabindex="1"></p>

<p style="margin-top: 0; margin-bottom: 4">Email Address:&nbsp;
<input type="text" name="required_Address" size="50" tabindex="2"></p>

<p align="left" style="margin-top: 0; margin-bottom: 4">Nature of Comment:&nbsp;

<select size="1" name="required_commentnature" tabindex="3" onChange="enable_element()">

<option value="None">No Choice Selected Yet</option>
<option value="TeacherPage">Content of Teacher Page(s)</option>
<option value="GeneralPage">Content of General Page(s)</option>
<option value="ExternalLink">External Link(s) from Website</option>
<option value="General">General Site Comment(s)</option>

<p align="left" style="margin-top: 0; margin-bottom: 4">If Commenting on external links, please specify nature:

<select size="1" name="LinkOption" tabindex="4" disabled="true">

<option>No Choice Selected</option>
<option>External link is broken (does not link to an existing page)</option>
<option>Content of linked page is inappropriate</option>
<option>External link has outdated or incorrect information</option>
<option>Positive comment on external link</option>

<p align="left" style="margin-top: 0; margin-bottom: 4">If you are commenting on an external link, please indicate the page from which the link is from and the page to which it is linking.</p>
<p align="left" style="margin-top: 0; margin-bottom: 4">Comments:</p>
<p align="left" style="margin-top: 0; margin-bottom: 4">
<textarea rows="6" name="comments" cols="80" tabindex="5"></textarea></p>
<p align="center">
<input type="submit" value="Submit" name="submit" tabindex="10"><input type="reset" value="Reset" name="reset" tabindex="11"></p>


----->END OF CODE<----

10-16-2008, 01:45 AM
First, you should be aware that language is deprecated. Use type instead.

Secondly, JS is case sensitive:


...should be:


Javascript syntax for if statements is not the same as that of vbscript's if then. This part is erroneous:

if y="ExternalLink" then (document.getElementbyID("LinkOption").disabled=false)

And should be:

// Action

And lastly, you have incomplete comment line:

// -->

You miss highlighted.

You might find this complete ammendment useful:

<script type="text/javascript">
function enable_element()
var x=document.getElementsByName("required_commentnature")[0],

P.S., you can also use document.getElementById in replacement of document.getElementsByTagName. Just ensure to add an id attribute on the select element.

Hope that helps.

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