jquery: scroll-triggered opacity effect

I am attempting to gradually increase the opacity of my div as the user scrolls, similar to this:

$(document).ready(function() {
    $(document).scroll(function(e) {
        changeOpacity();
    });

    var element = $('#element');
    var elementHeight = element.outerHeight();

    function changeOpacity() {
        var opacityPercentage = window.scrollY / 100;
        if (opacityPercentage <= 1) {
            element.css('opacity', opacityPercentage);
        }
    }
});

This code is functional but the opacity is increasing too quickly. I have tried decreasing the opacity based on examples found online, but I cannot find a solution for increasing the opacity gradually. If my div has an initial CSS rule setting its opacity to 0, does anyone know how it should be adjusted?

javascriptjqueryhtmlcss

Answer №1

Modified: Check out this demo on jsFiddle

$(document).ready(function() {
    $(document).scroll(function(e){
        adjustOpacity();
    });

    var targetElement = $('#element');
    var elementHeight = targetElement.outerHeight();

    function adjustOpacity(){
        var opacityPercentage = window.scrollY / $(document).height();
        console.log(window.scrollY, opacityPercentage);
            targetElement.css('opacity', opacityPercentage);
    }
});
  1. The scrollY value is in pixels, so dividing it by 100 may not be necessary if the scroll range isn't limited to [0 - 100].
  2. To accurately adjust opacity based on scrolling, divide the scroll value by the total document's height (or its containing parent that displays a scrollbar).

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