32 lines
1.0 KiB
JavaScript
32 lines
1.0 KiB
JavaScript
function findParent(el, selector) {
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let retval = null;
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while (el) {
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if (el.matches(selector)) {
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retval = el;
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break
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}
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el = el.parentElement;
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}
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return retval;
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}
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function findChild(el, selector) {
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for (let i = 0; i < el.children.length; i++) {
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if (el.children[i].matches(selector)) { return el.children[i]; }
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let rec = findChild(el.children[i], selector);
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if (rec !== null) return rec;
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}
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return null;
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}
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function imgcarousel_move(source, delta) {
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let carousel = findParent(source, ".imgcarousel_parent");
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let index = parseInt(carousel.getAttribute('data-imgcarousel-index'));
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let images = JSON.parse(carousel.getAttribute('data-imgcarousel-images'));
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let content = findChild(carousel, '.imgcarousel_content');
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index = (index + delta + images.length) % images.length;
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carousel.setAttribute('data-imgcarousel-index', index);
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content.setAttribute('style', 'background-image: url(' + images[index] + ');');
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} |