Slider

Best Practices

Use familiar directions. Place the minimum value on the leading side (left in left-to-right languages) and the maximum on the trailing side. For vertical sliders, orient minimum at the bottom and maximum at the top.

Consider additional controls. When a wide range of values is needed, pairing the slider with a text field or stepper can help users select precise values.

Customize thoughtfully. Changing colors, track visuals, or icons can reinforce meaning (e.g., small vs. large image icons), but avoid adding unnecessary complexity.

Indicate value changes. Updating a label or other visual cue in real time helps users understand their current selection without guesswork.

Style

Sliders typically display a track with a highlighted portion between the minimum and the thumb, reflecting the current value. On mobile:

Thumb Design. A simple circle is common; some designs include an icon or shape that signifies the function (e.g., a sun for brightness).

Track Appearance. A colored fill on the active range can clarify how far a user’s selection extends. Light or subtle gradients often blend well with modern UI themes.

Icons for Context. Placing symbolic icons (like a minus sign on the left and a plus sign on the right) can communicate the effect of moving the slider.

Content

The slider’s value is often implied visually, but providing numerical feedback can be helpful:

Dynamic Labels. As people drag the thumb, update a text label or overlay to display the current value.

Range Markers (optional). For specific increments (e.g., 0%, 50%, 100%), you might provide tick marks or textual markers for quick reference.

Boundaries. Clear indicators at each end (e.g., “min” and “max” or relevant icons) ensure users recognize the allowable range.‍

Role

Sliders streamline value adjustments without extensive typing or multiple taps:

Continuous Adjustments. Tasks like brightness, zoom, or rating can benefit from fluid, real-time control.

Single-step Interaction. With a single gesture, users can explore various settings rather than incrementing one unit at a time.

Immediate Feedback. As the thumb moves, instant feedback lets people fine-tune the setting and confirms how the new value will look or function.