Constant Sum & Exclusive

Question

I have a constant sum question but I also need to incorporate a checkbox that says "this does not apply to me," which will overwrite the forced-answer of the constant sum.

A user cannot enter numbers in the input fields if the box is checked (or vice versa).

Is this possible? If so, how?

Answer 1

I accomplished this using a constant sum question and a select question on the same page.

For the constant sum, disable require response and use this custom JavaScript verification (found by clicking "Advanced..." in the question's settings):

var selectQuestion = 's';
var constantSumQuestion = 'cs';
var constantSumTotal = 100;

if (SSI_GetValue(selectQuestion + '_1') == 0 && $('#' + constantSumQuestion + '_total').val() != constantSumTotal)
{
    var strErrorMessage = 'Error.';
}

You will need to update the question names in lines 1 and 2, and also update the constant sum total in line 3.  Additionally, you can update the error message that will show up by changing line 7.

For the select question, use the list item "Does not apply" and set the question to use a check box.  Finally, put this code in the select question's footer:

<script type="text/javascript">
function SSI_CustomGraphicalCheckbox(GraphicalCheckboxObj, InputObj, BlnCheck)
{
    var selectQuestion = 's';
    var constantSumQuestion = 'cs';

    if (InputObj.name == selectQuestion + '_1')
    {
        var csInputSelector = '#' + constantSumQuestion + '_div .input_cell';
        var numOfCsItems = $(csInputSelector).length;
    
        if (BlnCheck)
        {
            for (var i = 1; i <= numOfCsItems; i++)
            {
                var field = '#' + constantSumQuestion + '_' + i;
                $(field).prop('disabled', true);
                $(field).val('');
            }
            $('#' + constantSumQuestion + '_total').val('');
        }
        else
        {
            for (var i = 1; i <= numOfCsItems; i++)
            {
                var field = '#' + constantSumQuestion + '_' + i;
                $(field).prop('disabled', false);
            }
        }
    }
}
</script>

Like before, you'll need to replace the constant sum and select questions' names in lines 4 and 5.

Comments

Fantastic! It works perfectly!

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EDIT: NVM, found Zachary's code on the  Questions Library download page!  Could this be done using a constructed list in the Constant Sum question?  Works great on the preview but on the live survey, only some of the items get "grayed" out because the list is partial, based on a random set of items.

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Geoffrey, glad "Not Applicable" could be of use.  It sounds like you are all squared away.  If not, I'd be happy to answer any questions that remain.