Попробуйте
.addEventListener ("dragend",function(){
console.log('nothing');
});
РЕДАКТИРОВАТЬ: Это зависит от того, какой браузер вы используете. Информация взята с http://help.dottoro.com/ljsluknm.php. Различные браузеры используют разные имена событий.
var source = document.getElementById ("source");
var target = document.getElementById ("target");
if (source.addEventListener) { // all browsers except IE before version 9
// Firefox from version 3.5, Google Chrome, Safari, Internet Exlorer
source.addEventListener ("dragstart", DumpInfo, false);
// Firefox before version 3.5
source.addEventListener ("draggesture", DumpInfo, false);
// Firefox, Google Chrome, Safari, Internet Exlorer
source.addEventListener ("drag", DumpInfo, false);
// Firefox, Google Chrome, Safari, Internet Exlorer
source.addEventListener ("dragend", DumpInfo, false);
// Firefox, Google Chrome, Safari, Internet Exlorer
target.addEventListener ("dragenter", DumpInfo, false);
// Firefox, Google Chrome, Safari, Internet Exlorer
target.addEventListener ("dragover", DumpInfo, false);
// Firefox from version 3.5, Google Chrome, Safari, Internet Exlorer
target.addEventListener ("dragleave", DumpInfo, false);
// Firefox
target.addEventListener ("dragexit", DumpInfo, false);
// Firefox from version 3.5, Google Chrome, Safari, Internet Exlorer
target.addEventListener ("drop", DumpInfo, false);
// Firefox before version 3.5
target.addEventListener ("dragdrop", DumpInfo, false);
}
else {
if (source.attachEvent) { // IE before version 9
source.attachEvent ("ondragstart", DumpInfo);
source.attachEvent ("ondrag", DumpInfo);
source.attachEvent ("ondragend", DumpInfo);
target.attachEvent ("ondragenter", DumpInfo);
target.attachEvent ("ondragover", DumpInfo);
target.attachEvent ("ondragleave", DumpInfo);
target.attachEvent ("ondrop", DumpInfo);
}
}