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document.addEventListener('scroll', function () {
progress();
// hideSidebar();
});
window.addEventListener("load", function () {
progress();
});
nodeBigSize = "25px";
nodeDefaultSize = "16px";
function progress() {
const sections = document.getElementsByTagName("section");
const nodes = document.getElementsByClassName("node");
if (nodes[0]) {
for (var i = 0; i < sections.length; i++) {
if (isInViewport(sections[i])) {
nodes[i].style.width = nodeBigSize;
nodes[i].style.height = nodeBigSize;
nodes[i].style.backgroundColor = "black";
}
else {
nodes[i].style.width = nodeDefaultSize;
nodes[i].style.height = nodeDefaultSize;
nodes[i].style.backgroundColor = "#555";
}
}
}
}
function hideSidebar() {
const sidebar = document.getElementById("sidebar");
const progressContainer = document.getElementById("progressContainer");
const sections = document.getElementsByTagName("section");
if (!progressContainer) {
return;
}
if (screen.width <= 600) {
if (window.scrollY >= 100) {
sidebar.style.left = "-80px";
for (var i = 0; i < sections.length; i++) {
sections[i].style.marginLeft = 0;
}
if (progressContainer) {
progressContainer.style.left = "-11px";
}
}
else {
sidebar.style.left = "0";
for (var i = 0; i < sections.length; i++) {
sections[i].style.marginLeft = "70px";
}
if (progressContainer) {
progressContainer.style.left = "61px";
}
}
}
else {
sidebar.style.left = "0";
progressContainer.style.left = "61px";
}
}
// Imagine a line in the middle of your viewport.
// Hence, it moves along gas you scroll.
// If this line is inside the element, returns true, else false.
function isInViewport(element) {
const rect = element.getBoundingClientRect();
const scroll = window.scrollY;
const position = window.scrollY + window.innerHeight / 2;
if (position < rect.bottom + scroll && position > rect.top + scroll) return true;
else return false;
}
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