So, if the respondent hasn’t selected none, then it’s okay if count-selected(.) is greater than one. The “ and” means both these things have to be true for the problem to exist. The problem occurs when the respondent has selected(.,'none') and count-selected(.)>1 However, the main interpretation is that the form will count how many choices were selected in the current question, and it will check if that count is greater than 1. You can read more about this function on the OpenDataKit website. The second part of the formula that you need to know is: count-selected(.)>1 The “.” refers to the answer currently being input into the questionnaire. It means that the respondent selected the choice “none” in the question that they’re currently answering. The first part of the formula that you need to know is: selected(.,'none') Two Parts to the XLSForm Constraint Formula The “name” for each label – is the variable name used in the constraint to refer to that option.The respondent sees the “label” for each option when he or she fills out the questionnaire.Options include choices such as “I don’t know”, “none of the above”, or “not applicable”.The choice list is under the “choices” tab.It applies to a “select_multiple” question.The important elements of the question set-up are as follows: So let’s dig in… Set Up the Question in XLSForm When we emphasise “more than one” answer, it indicates that part of the logic of our constraint will be looking at counting how many answers the respondent selected. We don’t want to allow anyone to select “none of the above” when they’ve selected more than one answer.
We don’t want to allow anyone to select “none of the above” when they’ve selected any other answer.What this XLSForm Constraint is Trying to Prevent
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If you want to download the XLSForm Constraint Template, click here to go get your download.
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Please watch this video to see the full explanation of how to create the constraint and how to construct the formula! So…there is a great constraint that you can use in your XLSForm to prevent this from happening. And then at the bottom of the list, we might have options like:īut it wouldn’t make sense if the questionnaire allowed you to select “None of the above” with another option also.
And it is very common in humanitarian and development questionnaires, where we give a list of options and say “select ALL that apply”. I want to create a constraint that prevents selecting “I don’t know” and any other option from a multiple_select question.” “How can I create a constraint such that respondents can’t select “I don’t know” and another option. I want to share with you a useful XLSForm constraint that you can use when you create digital questionnaires for Kobo Toolbox, ODK, Ona, or Surve圜TO.
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