artsapimp — Thu, 11 Oct 2001 16:22:46 +0000

Thank you very much.

That all makes sense and I will be using it more than just for this application.

Thanks again for your help.

Vincent Puglia — Thu, 11 Oct 2001 15:43:16 +0000

Hi artsapimp,

Why (box ? 1 : 0)? What does that mean?
(condition) ? true : false;
if the condition passes, execute the true (between ? and : ) else execute the false (after the : )

...the syntax. How does that translate?
since checkboxes are 'checked', the checked value is either true or false (on or off)

Can you at any time check for a true/false statement like you did with the ? and the : seperating each value?

yes.

How many values can you use between the :s?
theoritically, unlimited. However, you run the risk of confusing the browser, not to mention the programmer.

(browser == netscape) ? ( (version == '4.7')? (document.layers) : (document.getElementById) ) : ( (version < '5.5') ? (document.all) : (document.getElementById) )

BTW here's another solution to your original problem:

and more in flavor with radio buttons:

Vinny

artsapimp — Wed, 10 Oct 2001 20:11:31 +0000

Thank you very much.

I don't really understand what it's doing in the function and was hoping you could help me understand it a little.

Why (box ? 1 : 0)? What does that mean?
I'm assuming what is the value of the box (1 being on, 0 being off) but I don't understand the syntax. How does that translate?

While typing this I understood the rest of it.

Can you at any time check for a true/false statement like you did with the ? and the : seperating each value? How many values can you use between the :s?

Thanks for your help.

detox — Wed, 10 Oct 2001 03:34:43 +0000

on form submission you could do a simple check to see whether both are checked or not, then prompt the user to select only 1 option........

otherwise this script might do the trick. I have commented out an alert which would be optional. It groups two checkboxes together and only allows one to be checked. You can have other checkboxes as well, which wont be affected by the script...

<?php
<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\">

<html>
<HEAD>

&lt;script LANGUAGE=\"JavaScript\"&gt;
function countChoices(obj) {
max = 1; // max. number allowed at a time

box1 = obj.form.box1.checked;  // your checkboxes here
box2 = obj.form.box2.checked;


count = (box1 ? 1 : 0) + (box2 ? 1 : 0) ;
// If you have more checkboxes on your form
// add more  (box_ ? 1 : 0)  's separated by '+'

if (count > max) {
// alert(\"you can only choose one of these two boxes\")
obj.checked = false;
   }
}

&lt;/script&gt;
</HEAD>


<BODY>

<center>
<form>
Please choose up to 2 sections:
<p>
<input type=checkbox name=box1 onClick=\"countChoices(this)\">Section 1
<p>
<input type=checkbox name=box2 onClick=\"countChoices(this)\">Section 2
<p>
please not you can only select 1 of the above two options
<p>
<input type=checkbox name=another1 >Section 3
<p>
<input type=checkbox name=another2 >Section 4
<p>
<input type=checkbox name=another3 >Section 5


<p>
</form>
</center>


</body>
</html>


this part of the code always gets chopped off...

                          
?>

artsapimp — Tue, 09 Oct 2001 17:45:41 +0000

Thank you, but that did not do the trick.

When I applied that it just acts like there is nothing associated with onClick.

Mark Hensler — Tue, 09 Oct 2001 17:27:08 +0000

I'm not a JS guy, but here is my untested guess..

<input	type="Checkbox"
	name="Option1"
	onClick="document.forms.Troubleshooting.Option2.value='';">

'
Good Luck,