Unveil the path as you scroll

Currently, I am tasked with creating a dynamic timeline that has animations triggered by scrolling. As part of this project, I must also reveal a pathway as the user scrolls - this pathway consists of circular shapes.

The challenge lies in revealing an image gradually from left to right. The image is in PNG format with an opaque background to ensure that it does not interfere with other elements on underlying layers. I am struggling to find an effective solution for this task. Is it feasible to reveal an image with an opaque background using CSS alone or perhaps a combination of CSS and JavaScript?

javascriptjquerycsshtml

Answer №1

By implementing this snippet of code

window.onscroll = function (event) {
    var distance = window.pageYOffset + "px";
    document.getElementById("cover").style.left = distance;
}

You will be able to accomplish this task.

Live Demo: Demo

Answer №2

Is it achievable using only CSS? It might be possible, although I am skeptical.

If I have grasped your query accurately, achieving this effect with CSS and JavaScript is quite straightforward. Simply display an image and adjust its width based on the scroll position of the window, like so:

$(document).ready(function () {
    var total_height = $(document).height();
    $(window).scroll(function () {
        var new_width = 100 + (Math.round($(window).scrollTop() * 100 / total_height) * 4);
        $('#wrapper').css('width', new_width + 'px');
    });
});

http://jsfiddle.net/095rmnqd/3/

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