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timelineScript.js
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timelineScript.js
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(function() {
'use strict';
// define variables
var items = document.querySelectorAll(".timeline li");
// check if an element is in viewport
// http://stackoverflow.com/questions/123999/how-to-tell-if-a-dom-element-is-visible-in-the-current-viewport
function isElementInViewport(el) {
var rect = el.getBoundingClientRect();
return (
rect.top >= 0 &&
rect.left >= 0 &&
rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
rect.right <= (window.innerWidth || document.documentElement.clientWidth)
);
}
function callbackFunc() {
for (var i = 0; i < items.length; i++) {
if (isElementInViewport(items[i])) {
items[i].classList.add("in-view");
}
}
}
// listen for events
window.addEventListener("load", callbackFunc);
window.addEventListener("resize", callbackFunc);
window.addEventListener("scroll", callbackFunc);
})();