How to “if: page can scroll down”

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I’ve been trying to create a condition that would only appear if the page can be scrolled down but I can’t find a way to condition if the page is “full” enough that it scrolls down. Not even sure if its possible to do so.

I’m doing this to add a “scroll to top” link on my pages, but only if there is a need to scroll

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If anybody can help me I would appreciate it.

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  1. To add a show the ‘scroll to top’ link only if the page has been scrolled using jQuery:

    $(window).scroll(function(){

    if($(window).scrollTop() > 25 ){
        $('#scroll_to_top').show();
    }else{
        $('#scroll_to_top').hide();
    }

});