drag drop - how to know 'how many items are dragged and dropped?'

The action you want is an a page level On Timer action that runs every 0.5 seconds.


On Timer; Show; Target: your button; Condition: All checked (not Any) 
Question_00xx Contains -1
Question_00xx Contains -2


Where Question_00xx is the name of the question variable for the question.


Drag and drop questions put pairs of numbers in the question variable for each dropped item - the drag item number, a dash, the drop location number. So if you drag item 2 to location one then the variable contains 2-1. If you then drag item 3 to location 2 it will contain 2-1,3-2. To see this in action, set up a drag and drop question and click the Debug button next to the Preview button.


 

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