CSS/HTML: A guide to creating an element that switches to absolute positioning when scrolled past

Just starting out with CSS and HTML here, trying to figure out how to make an element become absolutely positioned once you scroll past it on the page.

Take a look at this example for reference: (no need for an account to test). As you scroll down, the black menu bar disappears and the white "How can we help you" menu becomes fixed in place.

I made a similar menu system as an example,

http://jsfiddle.net/jkdbP/

but I'm unsure where to begin in making it switch to absolute positioning when scrolled past. Appreciate any guidance you can provide!

jqueryhtmlcss

Answer №1

Take a look at this jsFiddle example: http://jsfiddle.net/jkdbP/2/

var menuTop = $('.menu').offset().top;
var menuClone = $('.menu').clone().addClass('fixed');

$(window).bind('scroll', function() {
    var scrollY = window.pageYOffset;

    if(scrollY > menuTop) {
        if(menuClone.parent().length === 0) {
            menuClone.appendTo($('.menu').parent());
        }
    } else if(menuClone.parent().length > 0) {
        menuClone.remove();
    }
});

To determine the vertical position of your menu, you can utilize jQuery's .offset().top. For tracking the page's scroll offset, use window.pageYOffset (or document.body.scrollTop for compatibility with older versions of IE). It is recommended to handle the scroll event triggered by the window.

Answer №2

Explore the CSS position property and learn about jQuery's .scroll() function.

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