show scrollbar to the right?

whenever the page's height is larger than the web browser window a scrollbar will appear to the right so you can scroll down/up in your page.

could scrollbar be displayed with javascript/jquery all the time even if there is no need for it? (has to do with a layout issue i've g开发者_如何学Pythonot)

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You can do that even without javascript, it is a CSS property:

overflow: scroll

But this will also always show a scrollbar at the bottom. Afaik you cannot avoid this.
It might be that this confuses the user somehow as normally he is not used to the fact that a scrollbar is shown even if he cannot scroll.
Before you use this solution, you should try to fix your layout issue.

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If you give the appropriate container element the style `overflow: scroll' then it'll have scrollbars. You can do that with jQuery if you like:

$('#containerId').css({overflow: 'scroll'});

Or of course you can do it in a CSS file, or even right on the element itself. You'll have to figure out which element to do that to; post some code if you need advice.

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Don't need javascript. Just add the css

body{ 
    overflow: scroll;
}