Lily Design System™

Gantt Table Body

A Gantt table body is the main content section of a Gantt chart grid, wrapping the rows that represent individual tasks and their timeline data. Each row typically contains a task name and cells indicating the task's duration across time periods. It is designed to be used inside a GanttTable <table> structure.

The component renders a <tbody> element and passes through its children, which are expected to be GanttTableTr or <tr> elements containing task and timeline cells.

Example

Design
Show demo markup 
<tbody class="gantt-table-tbody"><tr class="gantt-table-tr"><td class="gantt-table-td">Design</td></tr></tbody>
Usage example 
<script lang="ts">
    import GanttTable from "../GanttTable/GanttTable.svelte";
    import GanttTableBody from "./GanttTableBody.svelte";
    import GanttTableTr from "../GanttTableTr/GanttTableTr.svelte";
    import GanttTableTD from "../GanttTableTD/GanttTableTD.svelte";
</script>

<GanttTable label="Project timeline">
    <GanttTableBody>
        <GanttTableTr>
            <th>Design</th>
            <GanttTableTD active>---</GanttTableTD>
            <GanttTableTD />
        </GanttTableTr>
    </GanttTableBody>
</GanttTable>
Show Svelte source 
// In your Svelte component:
import GanttTableTbody from "lily-design-system-svelte-headless/components/GanttTableTbody/GanttTableTbody.svelte";

<GanttTableTbody>
  <!-- GanttTableTbody content -->
</GanttTableTbody>

Usage

<GanttTable label="Q1 2025 schedule">
  <GanttTableHead>...</GanttTableHead>
  <GanttTableBody>
    <GanttTableTr>
      <GanttTableTH scope="row">Design phase</GanttTableTH>
      <GanttTableTD active>████</GanttTableTD>
      <GanttTableTD active>████</GanttTableTD>
      <GanttTableTD></GanttTableTD>
    </GanttTableTr>
    <GanttTableTr>
      <GanttTableTH scope="row">Development</GanttTableTH>
      <GanttTableTD></GanttTableTD>
      <GanttTableTD active>████</GanttTableTD>
      <GanttTableTD active>████</GanttTableTD>
    </GanttTableTr>
  </GanttTableBody>
</GanttTable>

Props

  • children: slot (required) -- task rows representing items and their timeline data
  • ...restProps: Any additional HTML attributes passed to the <tbody> element

Keyboard Interactions

None -- this component is a passive container. Keyboard navigation is handled by the parent GanttTable grid.

ARIA

  • Implicit rowgroup role from the <tbody> element -- groups the body rows of the grid

When to Use

  • Use inside GanttTable to provide the <tbody> body section containing task rows.
  • Use to group all task rows and their timeline data cells.
  • Use when the Gantt chart has one or more tasks to display against a time axis.

When Not to Use

  • Do not use outside of a GanttTable structure -- use TableBody or DataTableBody for general tables.
  • Do not use for header or footer rows -- use GanttTableHead or GanttTableTfoot instead.

Headless

This headless component provides a <tbody> element with implicit rowgroup role for grouping body rows within a Gantt chart grid. The consumer provides all visual styling including row spacing, alternating row colors, and bar rendering.

Styles

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

Testing

  • Verify the component renders a <tbody> element with class gantt-table-tbody
  • Verify pass-through attributes are applied

Advice

  • Designers: Use alternating row backgrounds or subtle borders to help users track across long timelines. Highlight the current time period column.
  • Developers: Place GanttTableTr elements as children. Each row should have a <th> for the task name followed by GanttTableTD cells for time periods.

Implementation Notes

  • Renders as a <tbody> element for the body section of a Gantt chart grid
  • Children should be task rows, each with a task-name cell and time-period cells
  • Designed to be used inside a GanttTable <table> structure
  • Spreads restProps onto the <tbody> element for consumer customization
  • No internal state -- purely a structural wrapper

Related components

  • gantt-table — a Gantt chart table interactive grid for planning schedule visualization <table>
  • gantt-table-thead — see components.tsv
  • gantt-table-tfoot — see components.tsv
  • gantt-table-tr — see components.tsv
  • gantt-table-th — a Gantt chart table interactive grid header cell for planning schedule visualization <th>
  • gantt-table-td — a Gantt chart table interactive grid data cell for planning schedule visualization <td>

References

  • WAI-ARIA Grid Pattern: https://www.w3.org/WAI/ARIA/apg/patterns/grid/

Canonical contract

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

Metadata

  • Component: gantt-table-tbody
  • PascalCase: GanttTableTbody
  • Description: a Gantt chart table interactive grid tbody for planning schedule visualization <tbody>
  • Status: beta — implemented and unit-tested in all seven frameworks with an axe-clean demo page; not yet exercised in composed flows
  • HTML tag: <tbody>
  • CSS class: .gantt-table-tbody
  • Interactive: no

ARIA

  • Implicit rowgroup role from the <tbody> element -- groups the body rows of the grid

Keyboard

  • No keyboard interactions — this is a passive element

Props

  • children: slot (required) -- task rows representing items and their timeline data
  • ...restProps: Any additional HTML attributes passed to the <tbody> element