$.fn.infiniteCarousel = function () { function repeat(str, num) { return new Array(num + 1).join(str); } return this.each(function () { var $wrapper = $('> div', this).css('overflow', 'hidden'), $slider = $wrapper.find('> ul'), $items = $slider.find('> li'), $single = $items.filter(':first'), singleWidth = $single.outerWidth(), visible = Math.ceil($wrapper.innerWidth() / singleWidth), // note: doesn't include padding or border currentPage = 1, pages = Math.ceil($items.length / visible); // 1. Pad so that 'visible' number will always be seen, otherwise create empty items if (($items.length % visible) != 0) { $slider.append(repeat('
  • ', visible - ($items.length % visible))); $items = $slider.find('> li'); } // 2. Top and tail the list with 'visible' number of items, top has the last section, and tail has the first $items.filter(':first').before($items.slice(-visible).clone().addClass('cloned')); $items.filter(':last').after($items.slice(0, visible).clone().addClass('cloned')); $items = $slider.find('> li'); // reselect // 3. Set the left position to the first 'real' item $wrapper.scrollLeft(singleWidth * visible); // 4. paging function function gotoPage(page) { var dir = page < currentPage ? -1 : 1, n = Math.abs(currentPage - page), left = singleWidth * dir * visible * n; $wrapper.filter(':not(:animated)').animate({ scrollLeft: '+=' + left }, 500, function () { if (page == 0) { $wrapper.scrollLeft(singleWidth * visible * pages); page = pages; } else if (page > pages) { $wrapper.scrollLeft(singleWidth * visible); // reset back to start position page = 1; } currentPage = page; }); return false; } $wrapper.after('<'); // 5. Bind to the forward and back buttons $('a.back', this).click(function () { return gotoPage(currentPage - 1); }); $('a.forward', this).click(function () { return gotoPage(currentPage + 1); }); // create a public interface to move to a specific page $(this).bind('goto', function (event, page) { gotoPage(page); }); }); }; $(document).ready(function () { $('.infiniteCarousel').infiniteCarousel(); });
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