Lily Design System™

Task Bar Button

A task bar item is a single button within a task bar, rendered as a native <button> element for proper keyboard and screen reader support. It is designed to be placed inside a TaskBar container that manages layout and grouping.

The component uses <button type="button"> to avoid unintended form submissions and supports the disabled attribute for disabling interaction. Content is provided through the children slot, allowing full flexibility in button content.

Example

Show demo markup 
<button class="task-bar-button">Task</button>
Usage example 
<script lang="ts">
  import TaskBarButton from "./TaskBarButton.svelte";
</script>

<TaskBarButton onclick={() => console.log("new")}>New</TaskBarButton>
Show Svelte source 
// In your Svelte component:
import TaskBarButton from "lily-design-system-svelte-headless/components/TaskBarButton/TaskBarButton.svelte";

<TaskBarButton>TaskBarButton</TaskBarButton>

Usage

<TaskBar label="Document actions">
  <TaskBarButton>New</TaskBarButton>
  <TaskBarButton>Save</TaskBarButton>
  <TaskBarButton disabled>Delete</TaskBarButton>
</TaskBar>
<TaskBar label="Patient actions">
  <TaskBarButton onclick={handleReferral}>New Referral</TaskBarButton>
  <TaskBarButton onclick={handleAppointment}>Book Appointment</TaskBarButton>
</TaskBar>

Props

  • disabled: boolean (default: false) -- whether the button is disabled
  • children: slot (required) -- button content
  • ...restProps: Any additional HTML attributes passed to the <button> element

Keyboard Interactions

  • Tab: Focus the button
  • Enter / Space: Activate the button (browser default)
  • Button is skipped in tab order when disabled is true

ARIA

  • Implicit button role from the <button> element
  • disabled attribute communicates disabled state to assistive technology

When to Use

  • Use inside TaskBar to represent one task shortcut or quick action.
  • Use for individual action buttons such as "New", "Open", "Save", or domain-specific operations.
  • Use when a button should be grouped within a toolbar context for proper assistive technology announcements.

When Not to Use

  • Do not use outside TaskBar -- use Button for standalone actions.
  • Do not use for navigation links -- use ActionLink instead.
  • Do not use for toggle actions -- use ToggleButton instead.

Headless

This headless component renders a <button type="button"> element with disabled support and a children slot for content. It provides native button semantics without accidental form submission. The consumer provides all visual styling including colors, sizing, icons, and hover/focus states.

Styles

The consumer provides all CSS styling. The component renders with a .task-bar-button class for targeting. No default styles are included — this is a fully headless component.

Testing

  • Verify the component renders a <button> element with class task-bar-button
  • Verify keyboard interactions work correctly
  • Verify pass-through attributes are applied

Advice

  • Designers: Use consistent button sizing within the task bar. Consider icon-only buttons with tooltips when horizontal space is limited.
  • Developers: Use type="button" (already set) to prevent accidental form submissions. Handle click events via onclick in restProps for action behavior.

Implementation Notes

  • Renders as a <button type="button"> element for native button semantics
  • Supports a disabled prop to disable the button
  • Content is provided through child elements
  • Passes through all additional HTML attributes via ...restProps
  • Designed to be placed inside a TaskBar container

Composition

TaskBarButton is designed to be used as a child of TaskBar. The TaskBar provides the role="toolbar" container, and each TaskBarButton provides an individual action button within it.

Related components

  • task-bar — a horizontal bar of task shortcuts or actions

References

Canonical contract

Generated from this component's canonical metadata — the machine-checked source the implementations are held to.

Metadata

  • Component: task-bar-button
  • PascalCase: TaskBarButton
  • Description: one item in a task bar
  • Status: beta — implemented and unit-tested in all seven frameworks with an axe-clean demo page; not yet exercised in composed flows
  • HTML tag: <button>
  • CSS class: .task-bar-button
  • Interactive: yes

ARIA

  • Implicit button role from the <button> element
  • disabled attribute communicates disabled state to assistive technology

Keyboard

  • Tab: Focus the button
  • Enter / Space: Activate the button (browser default)
  • Button is skipped in tab order when disabled is true

Props

  • disabled: boolean (default: false) -- whether the button is disabled
  • children: slot (required) -- button content
  • ...restProps: Any additional HTML attributes passed to the <button> element