Conditional Form Requirements (ASP.NET)

[pjb5064]

Hey guys,

I'm trying to make a form that has a conditional form requirement, but I'll dumb it down for this purpose:

The form would ask a question like so:

Are you cool?

This would be followed by two radio buttons: Yes, and No.

If the user selects "Yes", I want the next text box to have to be filled out. If the user selects "No", they shouldn't need to fill out the next box.

Any ideas? I've looked into Compare validators and such, but have not found a solution. It shouldn't be too hard to figure out, the trick is doing it on the client side though, as I don't want to use Ajax to load any part of the page again.

Thanks!

[ahmorrow]

Javascript. Let me know if this makes any sense to you.

<script type="text/javascript">
<!--
if (radioYes.value="selected") {
  if (textboxIfCool.value="") {
  window.alert("ERROR:  You must fill in such and such textbox."
  }
}
//-->
</script>

[pjb5064]

thats great, but honestly the only problem is that I don't want a popup. The rest of my errors throw a red "*" next to the item, which I'm sure I can put a label and change the text with javascript as well?

You'll have to excuse my lack of knowledge with javascript, but if this is possible, let me know!

Thank you!

[ahmorrow]

change

window.alert("ERROR:  You must fill in such and such textbox."

to

document.write(getElementById(pBeforeRadioYes.innerText="*"));

or something similar. If you don't get it still I'll rewrite it later.