I have a form that successfully totals options from radio button questions (it's an event registration form) and processes through PayPal with no problems. However, when questions are setup as hidden that are made visible from a question event (for example, the registrant first selects whether they're a member or not which then displays the questions and pricing for members and vice versa for non-members to get non-member questions and pricing), I'm getting js errors like this:

Message: 'null' is null or not an object
Line: 65
Char: 1
Code: 0
URI: https://www.../Portals/0/Dynamic-Forms_Module_455.js

My assumption is this is due to questions that remain hidden which are 'null' which of course keeps the form from doing the totaling. The script that's doing the totaling is as follows:

$(TotalMemTrack) = funcRadioCalc($(MemTrack_FieldID))
$(TotalLunchMem) = funcRadioCalc($(LunchMem_FieldID))
$(TotalLunchNonMem) = funcRadioCalc($(LunchNonMem_FieldID))

$(GrandTotalHidden) = parseFloat($(TotalLunchMem)) + parseFloat($(TotalMemTrack)) + parseFloat($(TotalLunchNonMem))

$(Amount) = formatCurrency($(GrandTotalHidden))

$(PayPalTotal) = toTwoDecimals($(GrandTotalHidden))

 

So, my thought was to setup If/Else statements in place of the code that's just pulling what's being sent by the question so a zero is plugged into the script that does the totaling instead of a null - like this:

 

if (funcRadioCalc($(LunchMem_FieldID)) == null) {
$(TotalLunchMem) = 0;
} else {
$(TotalLunchMem) = funcRadioCalc($(LunchMem_FieldID));
}

 

However, I'm still getting the 'null' error. Another thought was I needed to expand the If part a bit more to include a zero length being sent by the hidden question like this:

 

if (funcRadioCalc($(MemTrack_FieldID)).length==0)||(funcRadioCalc($(MemTrack_FieldID))==null) {
$(TotalMemTrack) = 0;
} else {
$(TotalMemTrack) = funcRadioCalc($(MemTrack_FieldID));
}

 

But, I don't know if this is the correct syntax or what. Am I on the right track or is there another way to ignore the nulls from the hidden questions?

HI, any fields that you set "hidden until made visible by a question event" or "Hide from roles" will not be rendered on the page, so client side javascript will not know it exists and also that field will not be saved to the database unless, of course, it gets triggered visible first and then client side javascript can then act on it.

So your if else statement:
if (funcRadioCalc($(LunchMem_FieldID)) == null) {
$(TotalLunchMem) = 0;
} else {
$(TotalLunchMem) = funcRadioCalc($(LunchMem_FieldID));
}
will error out since the field "LunchMem" is still hidden on page load. What you want to do is set $(TotalLunchMem) = 0 on page load under Module Configuration / Initial Javascript. Don't reference any radio button fields yet on page load. Then proceed with your javascript that you had on the radio button fields. I think this will work out for you. -- David

Hi David -

OK, that makes sense. So, what is the syntax for setting something to zero on page load?

$(TotalLunchMem) = 0;

in module configuration / javascript / initial javascript

-- David