c2n/web-componentsv0.0.6
GitHub repository

Switch

On/off toggle on a native switch input, with label, description and thumb icons.

c2-switch toggles a setting on or off. It wraps a native <input type="checkbox" role="switch">, so Space toggles it, the form receives name and value while on, and assistive technology announces a switch. The thumb can be clicked or dragged: it follows the pointer and settles on the side it is released. The whole row is the label: text in the default slot and an optional description sit beside the track and clicking them toggles it too. Small icons can ride inside the thumb for either state, and every part of the track, thumb and text is a variable. Use it for settings that apply immediately; use c2-checkbox for choices that are submitted later.

Installation

npm install @c2n/switch

Usage

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checked reflects the state and change fires on every user toggle; call toggle() (optionally with true or false) to flip it from code and fire the same event, or set checked to change it silently. The inner input carries name and value (on by default) but lives in a shadow root, so it is not submitted with a surrounding form; read checked on submit or mirror it into a hidden input.

Name a switch with slotted text or label, and use aria-label only for a bare track. A description is announced through the row label as well. The pressed thumb stretches slightly towards the side it is moving to (--c2-switch__thumb__active--stretch, 0px to disable) and the thumb slides over --c2-switch--transition-duration, which is disabled under reduced motion. Dragging works with mouse, pen and touch: after a few pixels of movement the thumb follows the pointer, and releasing it past the middle of the track changes the state (and fires change); a shorter press is a normal click.

The label sits after the track by default; --c2-switch__container--flex-direction: row-reverse puts it first and, with justify-content: space-between and a width, pushes the track to the far edge, which is the settings-row layout above. Track and thumb are themed with --c2-switch__track--* and --c2-switch__thumb--* (an outlined switch is a transparent track with a border and a tinted thumb), and the thumb icons with --c2-switch__icon--*.

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