This is my function

iPictureframe.find("img").on("dragstart", function(event, ui) {

      iframe.find(".wpEdit img").on("drop", function(event, ui) {

           myFunction()
      });

});  

My problem here is that, an on drop event handler will be added to " iframe.find(".wpEdit img") "

so whenever anything is droped on   " iframe.find(".wpEdit img") " it runs myFunction,

but I ONLY  want " iPictureframe.find("img") " to be only dropable element to run myFunction()

How can i accomplish that?