![]() ![]() Sliders work best when the specific value does not matter to the user, but an approximate value is good enough. Is an Exact Value Necessary?Īllowing the selection of a very specific value is often not necessary, nor very helpful, to the user. Unless you want to render these users helpless, a slider control may not be the best choice. Would they be able to select a value even close to what they wanted? How much effort and how many tries would it take them? Many older users have less steady hands than younger users and would have similar difficulties performing precise gestures to manipulate small UI elements. Think about how challenging it would be to interact with a slider control for users with motor difficulties. ![]() The Depart and Arrive sliders only allow whole hour values, but the Duration sliders force users to select a value down to the precise minute.Īnother major consideration when designing a touch interface is the accessibility of various UI elements. The Kayak app uses multiple sliders for filtering based on the time of flights. (The steering law also applies to drop-down menus and horizontal scrollbars.) With mobile devices being, well, mobile, it is not surprising that we see many users accidentally nudge the slider off the value they were attempting to select just as they lift their finger off the screen. Sliders are subjected to the steering law, which describes the time needed to navigate through a tunnel-as you might guess, the longer and narrower the tunnel, the more time it takes to steer through it. In such circumstances it can be daunting to tap and drag a control precisely to a particular spot. For mobile design in particular, users often hold their device in one hand while doing other activities-watching television, walking, or even driving. When designing a usable UI we must consider the context in which the interface will be used. Especially on touch interfaces, the level of control needed to meticulously operate a slider to an exact value is simply not realistic.ĭefinition: A slider is a control element that uses a knob or lever moved horizontally to control a variable, such as volume on a radio or brightness on a screen. However, in practice, sliders are difficult to manipulate. Sliders are often the UI control of choice for letting users select a value or range from a fixed set of options. ![]()
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