how to validate if two radio buttons are checked

[liaos]

Hi! I hope someone can help me:

I have 3 groups of radio buttons (each group has more than 3 choices)

A - full day course (3 choices)
B - half day morning (4 choices)
C - half day afternoon (4 choices)

I need to
1) alert users only when any A and any C are BOTH selected (schedule conflict)

2) alert users only when any B and any C are BOTH selected (qualifies for discount)

I've tried

function validate(form1) {
if(document.form1.workshop[0].checked)
{
alert('You must choose an option, and complete the form field');
}
}

This works, but only when I click on the first choice of group A.
So I tried to create a variation to validate when A and C are both selected:
if(document.form1.workshop[0].checked && if(document.form1.halfday[0].checked)
but it didn't work...

plus, I don't want to detect just workshop[0], but any of the 3 choices (workshop0-2)

any help will be greatly appreciated!!!
Thanks a lot!!!!

YC

[glenngv]

Please post the HTML code.

[liaos]

here is the form

<form name="form1" method="post" onSubmit="return validate(this);" action="">
Full Day Workshop
<input type="radio" name="workshop" value="W1">FullW1
<input type="radio" name="workshop" value="W2">FullW2
<input type="radio" name="workshop" value="W3">FullW3
<input type="radio" name="workshop" value="W4">HalfW4<br><br>
Half day workshop
<input type="radio" name="halfwork" value="W5">HalfW5
<input type="radio" name="halfwork" value="W6">HalfW6
<input type="radio" name="halfwork" value="W7">HalfW7<br><br>
Half day tutorial
<input type="radio" name="halftutor" value="T1">halfT1
<input type="radio" name="halftutor" value="T2">halfT2
<input type="radio" name="halftutor" value="T3">halfT3
<input type="radio" name="halftutor" value="T4">halfT4<br>
<input type="submit" name="Submit" value="Submit">
</form>

How do I detect when
- any 1 Full day workshop and any 1 half day workshop are both selected (schedule conflict)
or
- any 1 full day workshop and any 1 half day tutorial are both selected
(schedule conflict)
or
- any 1 half day workshop and any 1 half day tutorial are both selected
(qualify for discount)

If someone can show me at least how one condition works, it will be greatly appreciated.

YC

[glenngv]

Use this function to check if any item is checked in a group of radios.

function detectCheck(radGrp){
  for (var j=0;j<radGrp.length;j++){
     if (radGrp[j].checked) return true; //one of them is checked
  }
  return false; //none is checked
}

for example:

function validate(f){
  //condition 1
  if (detectCheck(f.workshop) && detectCheck(f.halfwork)){
     alert("Schedule conflict!");
     return false;
  }
}

[liaos]

Dear glenngv:

It works!!!!

Thank you thank you thank you!!!

You really make my day!!!!

Truly appreciate your help!!!!!

[glenngv]

Glad I was able to help you.