FocusManager

by using the FocusManager, you can control the remote controller

FM can detect which key you had pressed, and then let the focus move by your direction

usage:
Initial

var focusManager = new FocusManager();
focusManager.addFocusItems(document);  
focusManager.setStartfocus(0);

To navigate the focus

focusManager.toUP();
focusManager.toDOWN();
focusManager.toLEFT();
focusManager.toRIGHT();

When you want to focus currentItem

focusManager.clickFocus();