As the end of 2015 draws near, Creative Review select the top ten ads of the year
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// Add an event listener for the scroll event on the window.
window.addEventListener("scroll", () => {
// Get the current scroll position.
let scrollTop = window.scrollY;
// Get the total height of the document.
let docHeight = document.body.offsetHeight;
// Get the height of the window.
let winHeight = window.innerHeight;
// Calculate the percentage of the page that has been scrolled.
let scrollPercent = scrollTop / (docHeight - winHeight);
let scrollPercentRounded = Math.round(scrollPercent * 100);
// Try to open the popup if the visitor has scrolled more than 25% of the page and is not a member.
if (scrollPercentRounded > 25) {
openPopup();
}
});
