Fallback no-scroll style

[tracend]

This style may be applied when there is no app.state object to set scroll : false

Instead of setting app.scroll = false (which may be disruptive) maybe the body tag justneeds a class applied:

$("body").toggleClass("no-scroll");

The style itself can be as simple as this (just to disable scrolling):

.no-scroll { 
    overflow : "hidden" 
}