44 lines
1.5 KiB
JavaScript
44 lines
1.5 KiB
JavaScript
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function isElementInViewport (el) {
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var rect = el.getBoundingClientRect();
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return (
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rect.top >= 0 &&
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rect.left >= 0 &&
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rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) && /* or $(window).height() */
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rect.right <= (window.innerWidth || document.documentElement.clientWidth) /* or $(window).width() */
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);
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}
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//
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// little addon to enhance the carousel
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Array.from(document.getElementsByClassName("carousel")).forEach((carousel) => {
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let viewport = carousel.getElementsByClassName("carousel__viewport")[0];
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let slides = carousel.getElementsByClassName("carousel__slide");
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let nav_items = Array.from(carousel.getElementsByClassName("carousel__navigation-item"))
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let last_scroll_pos = null;
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viewport.onscroll = (_event) => {
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let position = slides.length * viewport.scrollLeft / viewport.scrollWidth;
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let direction = last_scroll_pos == null || last_scroll_pos < viewport.scrollLeft;
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last_scroll_pos = viewport.scrollLeft;
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nav_items.forEach((item, index) => {
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if (
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(direction && position > index-1 && position <= index) ||
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(!direction && position >= index && position < index+1)
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) {
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if (!item.classList.contains("enabled")) {
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item.classList.add("enabled")
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}
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return
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}
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if (item.classList.contains("enabled")) {
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item.classList.remove("enabled")
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}
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})
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}
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})
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