Hi - we would want to do it in real time.  I was thinking I could set the value of each choice to 1 and then have a way to add the values of all selected choices.  But I am really not sure.

Does the JavaScript example from this page regarding "Adding checkbox field values and populating a field with their sum" suffice? This goes with what you stated where you give each checkbox option a value of 1.

That is definitely what we need, only I need the field to populate the value from multiple choices.  So if three checkboxes are checked the value would return as 3.  

There is a notation that this can be done with some modification to the javascript, any thoughts on what changes would be necessary?

Thanks!

Actually, you don't need to set a value for each checkbox choice you have. You just need to slightly modify the JS example from the help page.

On your form, give each checkbox field you have a CSS class name "checkbox" while also having a single line field with "checkboxsum" as the CSS class name.

Then you can use this JS

$(function() {
    $(".checkbox").change(function () {
        var sum = 0
        $(".checkbox input:checked").each(function(){
            sum += 1;
        });
        $(".checkboxsum input").val(sum);
    });
});

This worked beautifully - now I have a follow-up question related to this and another topic you helped me on:

https://answers.laserfiche.com/questions/112262/Calculation-Forms-10#repliesToMain

I am using the total number of checkboxes checked to trigger a calculation, but combining these two together doesn't work.  The formula above accurately totals the number of check boxes, but does not trigger the calculation in the referenced link.  If I manually type a number in the "Sum" box then the calculation field displays the total amount due.

Thanks again!

You'll need to trigger a "change" event on the field that represents the checkboxsum for it to have the formula use the number from there to calculate the fee. You can use

$(function() {
    $(".checkbox").change(function () {
        var sum = 0
        $(".checkbox input:checked").each(function(){
            sum += 1;
        });
        $(".checkboxsum input").val(sum);
        $(".checkboxsum input").trigger('change');
    });
});

Worked perfectly!  Thank you!

Update on this:  The caculated value is not coming through when the task is assigned. It works prior to submission, but not after.  So the approval task shows $0.  

Any thoughts on this?

Thank you.

It appears this has to do with the field being "Read Only".  When I remove this option it works upon submission.  

Leave the "read only" option for that field unchecked on the form itself, but use javascript to make the field read only. See if that addresses the matter.