c2n/web-componentsv0.0.6
GitHub repository

Button Group

Attached buttons with shared borders, optionally a segmented control with single or multiple selection.

c2-button-group attaches related c2-button or c2-icon-button elements into one control: shared borders, rounded outside corners only and a divider between items. On its own it is a layout: the buttons keep their own behaviour and clicks. Add selection="single" and it becomes a segmented control that keeps exactly one item pressed, or selection="multiple" to let each item toggle independently; the pressed items carry selected (which the buttons announce as aria-pressed) and the group reports them in value and fires change. A positive --c2-button-group--gap separates the items into individually rounded buttons instead.

Installation

npm install @c2n/button-group

Importing @c2n/button-group also registers c2-button. Install @c2n/icon-button separately for icon items.

Usage

Items identify themselves with a value attribute (their index otherwise). In single mode the group’s value is the pressed item’s value and clicking the pressed item keeps it pressed; in multiple mode value is a comma-separated list and each click toggles one entry. Set value from code to change the selection silently; change fires only for clicks, with the new value in detail.value. The group marks its items toggle in selection modes so unpressed buttons still announce aria-pressed="false", and disabled on the group disables every item without touching the ones you disabled yourself.

The group owns the frame of its items through the button variables: --c2-button-group--border applies one border to every item (an outlined group), --c2-button-group--border-radius rounds the outside corners, and attached items overlap by --c2-button-group__divider--width so shared borders are drawn once, with --c2-button-group__divider--color painted between them (a translucent white line by default, which suits filled buttons; match the border colour for outlined groups or use transparent). Colours, heights and the pressed look come from the buttons’ own variables set on the group, as the Outlined and Segmented classes above show. --c2-button-group__item--flex: 1 1 0 makes every item the same width.

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