Google Forms - App script won't iterate through all form fields

Question

I have made a Google Form and onSubmit an app script will run iterating through all form questions and answers however some questions, when the corresponding answer is left empty, are not listed/available in the iteration. Nevertheless, many questions whose answer is empty, are "listed" in the iteration.

function onSubmit(e) { var items = e.response.getItemResponses(); var emailBody = ''; for (i in items){ // the follwoing will not iterate all questions emailBody+= "<br/>"+ items[i].getItem().getTitle()+": "+items[i].getResponse(); } ......... other code follows ..... }

Answer 1

I think I got it! Items being left out from the list are checkboxes with no answer... from the Google documentation:

getItemResponses() Gets all item responses contained in a form response, in the same order that the items appear in the form. If the form response does not contain a response for a given TextItem, DateItem, TimeItem, or ParagraphTextItem, the ItemResponse returned for that item will have an empty string as the response. If the form response omits a response for any other item type, this method excludes that item from its returned array.