Drop down disabling/enabling

I hope someone can help with what I suspect is a simple task. I have three drop downs in a form, let's call them A, B and C. Each dropdown has an 'Any' option, value 0 and an unspecified number of other options, values 1->N.

If A OR B are !=0, then C should be disabled. If A & B return to 0 then C should be re-enabled. If C is !=0, then A AND B should both be disabled. If C returns to 0 then A AND B should be enabled again.

If this makes sense then I'd be very grateful for any code to provide this functionality. I've got part of it working but not all.

Any comments appreciated.

 

you might want to use the toggle field, same code for your requirement

 

Not sure what you mean rkstech, by 'toggle' are you referring to the behaviour of radio buttons in a group? These are three drop-downs containing mulitple values which cannot (effectively) be replaced by check boxes or radio buttons.

 

I think you can use some JQuery, with something like:

$(document).ready(function() {
     $('#A').change(function() { 
         if($(this).val()!=0 || $('#B').val()!=0){
              $('#C').attr("disabled") == true; 
         }
          if($(this).val()==0 && $('#B').val()==0){
              $('#C').attr("disabled") == false; 
         }
     });
});

Code (markup):

Just adapt it for your different cases.