How to track modifier keys using javascript/jquery?

Question

My requirement is just easy: user press Ctrl key some notification appear on my page, and when released the notifications just disappear, so i need to track modifier keys such as Ctrl. Unfortunately i google and didn't find any clues, some famous keyboard libs such as Mousetrap and keymaster seem also does not cover this topic.

Any ideas?

Answer 1

Modifier keys trigger keydown (but not keypress). Then you can simply check the flags defined on the event object. shiftKey, altKey, ctrlKey, metaKey, etc.

A full list is here: http://api.jquery.com/category/events/event-object/