Processes keydown events.
keydown(event)

event | DOM Event, event object corresponding to keydown event

Returns undefined.

#### Description

This method is called internally when a keyboard button is pressed and will process keyboard events (up/down, left/right, enter, space, etc). This method emits .onKeydown event.
This method can be overwritten: $('#sidebar').w2sidebar({ name : 'sidebar', img : 'icon-page', nodes: [ { id: 'id-1', text: 'Level 1' }, { id: 'id-2', text: 'Level 2' }, { id: 'id-3', text: 'Level 3' } ], keydown: function (event) { console.log('Custom keydown event.'); } });