Require response for select question based on response to numeric question

Question

I have two  numeric questions 'c4dDays' and 'c4dWeeks'.  If a respondent leaves both of those questions blank, is there a way to require a response for the subsequent select question 'c4dSelect'

Comments

Is the select question on the same page as the numeric questions?

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Yes, it is on the same page

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Also, does the select use radio buttons, checkboxes, or a combo box / dropdown?

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radio buttons

Answer 1

Try setting your select question to not require a response, then give the select question this custom JavaScript verification:

if (!$('#c4dDays').val().trim() && !$('#c4dWeeks').val().trim() && !SSI_GetValue('c4dSelect')) {
    strErrorMessage = 'Error message here.';
}