Textarea when Radio Button Clicked Yes

Question

I'm trying to add a textarea for a gift message if the users
clicks the "Yes" radio button. The characters have to be limited to
150. I'm not a programmer and know very, very, little coldfusion.
The message in the textarea will be stored in a pre-existing DB
column.
Any help with this is greatly appreciated.

Answer 1

<input type="radio" name="giftMessage" value="1"
onclick="textAreaShow('inline');" />Yes
<input type="radio" name="giftMessage" value="0"
onclick="textAreaShow('none');" />No
<textarea name="giftMessageText"
id="giftMessageText"></textarea>
<script type="text/javascript">
function textAreaShow(onOff) {
document.getElementById('giftMessageText').style.display =
onoff;
</script>
for the text limit, that's a little tougher. textareas do not
have the builtin maxlength attribute that text inputs have. there
are javascripts you can use that will fire on the onkeyup event of
the textarea counting the characters, but i personally don't care
for those.
i'd suggest on the submit action of the form, check the
textarea.value length using JS and if it exceeds 150 characters,
don't submit the form and alert the user. in addition, DEFINITELY
check on the form's action page using CF to ensure that the length
of the value passed is less than 150 (and if not, handle
appropriately).