The illusion of continuity, created by half images or text that look like they are continued beyond the vertical edge of the screen, is a strong carousel cue - users quickly understand that they can get more content by moving beyond screen edge.Īnother problem that makes carousel cues such as arrows and dots easy to miss is that they often appear on top of a carousel image. Dots are generally weak signifiers: because they are small, people often don’t notice them. Some carousel cues are stronger than others. There are three types of carousel cues traditionally used to signal carousels on mobile: Even when the carousel is self-animated, a mobile page is so small that by the time the carousel image has changed, the user may have scrolled down and not see it anymore. DiscoverabilityĪ hurried mobile user looking for specific content may never notice a carousel. In contrast, (right) correctly used only 4 items in its hero carousel. Netflix for iPhone (left) used carousels to display long lists: the Popular on Netflix carousel had 70+ items and required users to scroll more than 23 times to get to the last item. Also, by showing the best items first, a prioritized sequence may draw users in and encourage them to stick with the carousel longer than with a random sequence. Prioritization alleviates the tediousness of sequential access, because users often won’t need to proceed through many steps. Consider using personalization to make the first few swipes even more relevant to the specific user. In the Netflix example below, the hero carousel displayed just one item per page and required 5 swipes to reach the 6 th item in the carousel, but the other carousels displayed 3 items per page (thus requiring 16 swipes to reach the last item in a list of 50).Īim to prioritize carousel items, so that the ones of most interest to users are shown first. If multiple items per page are displayed, then the carousel may fit more. Note that the recommendation of 3 to 4 steps to reach the last item does not necessarily mean that the carousel should have only 3 or 4 items. If you have a high number of items, use a list view instead and allow people to directly access any of the items on the page. Because of that, we recommend that users should be able to reach the last item in the carousel in 3–4 steps (i.e., taps or swipes). Going through items one by one with the hope of possibly finding one of interest is no fun: most people stop after viewing 3–4 different pages in the carousel. In this article we discuss a few usability guidelines meant to alleviate these issues on mobile devices. Even if people recognize the carousel, they will often have no way to know what types of items are hosted in it without interacting with the carousel.Īdditionally, not all carousel controls are implemented correctly on touchscreens. They are based on sequential access: users must go through all the items in the carousel one by one in order to get to the last one.However, carousels also have some important disadvantages: Their second big plus is that they may solve content-priority quarrels within the organization by allowing everybody to make their mark on the main screen (even though it often turns into an invisible mark). Like menus and accordions, carousels have an important advantage on mobile: they fit a lot of content into a relatively small footprint. As a result they often forewent vertical scrolling in favor of a card or carousel-like design.) ( Original iPad designs were fascinated by the etched-screen aesthetic and wanted to control the layout in the tiniest detail. On mobile, carousels increased in popularity when the iPad was first introduced. On desktop, the carousel has always been a popular way to stick multiple pieces of content on the front page without taking up too much space.
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