keyboard scrolling UP / DOWN

Question

I have this code

$(document.body).onkeyup = function(e) {
    var code = e.keyCode;
    if(code === 74) {
        window.scrollTo(document.body.scrollLeft,
                    document.body.scrollTop + 200);
    }
};

that allows me to scroll a page up and down with the keyboard. The problem is that I have to click on the page I want to scroll to activate this function.

Is there a way to activate immediately without the mouse click?

Thanks.

Answer 1

As @somethinghere mentioned in the comments, the reason the shortcut doesn't work is because the document doesn't have focus.

You can attempt to force focus to document , but doing so is browser dependant:
Is there any way in JavaScript to focus the document (content area)?