Change required value based on previous question?

http://jsfiddle.net/ohwo4sy5/21/

Superb response!

Newbie questoin, when I am building the form in formidable where would I put this code?

I always put my js/jquery in the "after fields" box of the customize html section of the settings for my forms.

Ok, I finally got around to working on this.  I think I am having a newbie problem getting my syntax formatted properly for the JS.  When I do the following.

 
<script type="text/javascript">
jQuery(document).ready(function($){
  $('#field_obbd9[value="0"]').hide();
  $('#field_obbd9[value="1"]').hide();
$('#field_obbd9').val("2");
$('#selectuser').bind('change', function () {
     if(field_onthf.value == 'New') {
         $('#field_ obbd9[value="0"]').hide();
         $('#field_ obbd9[value="1"]').hide();
         $('#field_ obbd9').prop('selectedIndex',2);
     }
     else if(field_onthf.value == 'Returning') {
         $('#field_hufnn').show();
         $('#field_hufnn').prop('selectedIndex',0);
     }
})
})
</script>

I am getting an error:
Can'f find variable: JQuery in safari.  (see screenshot) Any tips?

Try:

$(document).ready(function(){

Thanks, I finally had to add before the $document....

<script src="http://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>

Couple more things:

Here is my simple test form:

http://registration.rouseband.org/wp-admin/admin-ajax.php?action=frm_forms_preview&form=gfgev

For some reason when I do this switch the qty value does not follow:

New; qty value = 2
Switch to returning; qty value = 0
Switch back to new; qty value = 0

I expected the value in #3 to be = 2.

Also, in the js code I notice the word "hide".  But when I select new, the values 0 and 1 are still available in the dropdown.  Should those values be truly gone?

I suspect it has to do with the call to the bind element. I doubt your field ID for the user select field is #selectuser in your form. Find the right css ID and it will likely fix it.

I fixed the issue with the logic working.  I had an extra space.  For some reason though the .hide is not working in my sample form or your jsfiddle file

On the fiddle if you leave the default or select "New", it hides the values of 0 and 1. If you have it set to "returning", it shows the values of 0 and 1. Is that not what you are seeing? I'm unable to see your script in the page you provided so I can't verify it working.

I published my page here:

http://registration.rouseband.org/test/

A note about this test page:

The hide does not work for either chrome or safari

Here is a video of how the fiddle is working for me:

https://www.dropbox.com/s/eoncor3pt16ufue/js_hide_fiddle_demo.mov?dl=0

A note about this fiddle:

The hide works in Chrome
The hide does not work in Safari

Thanks for providing that. I should have cross-browser tested the solution.

Updated fiddle: http://jsfiddle.net/ohwo4sy5/49/

Perfect!  Worked like a champ in both Chrome and Safari. AND thank you for all your patience and help on this!!!!