aria-grid

WAI ARIA 1.1 conf implementation of "Layout Grid" pattern.

Specs

Please see all specs here http://w3c.github.io/aria-practices/#grid

https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Roles/Row_Role

Known limitations

It required "symmetrical" grid to work. So if you have 2 column in first row it should be 2 column all other rows.

It is cover all standard cases, but not cover real tables and grid with presentational elements like Calendar grid.

Usage

You could initialize this component in this way:

import Grid from './Grid.js';
document.querySelectorAll('[role="grid"]').forEach(grid => new Grid(grid).init())

Markup

Roles grid, row and gridcell is required. Also all focusable elements should have tabindex="-1", but it is not good from fault tolerance perspective. So it is done as progressive enhancement. We use data-roving-tab-target to convert item to tabindex="-1".

<div role="grid" data-wrap-cols="true">
	<div role="row" class="grid">
		<div role="gridcell" data-roving-tab-target>
			A
		</div>
		<div role="gridcell" data-roving-tab-target>
			B
		</div>
	</div>
</div>

Grid with interactive elements

Move data-roving-tab-target from cell to focusable elements to make it focusable when focus moved to the cell. Ex:

<div role="grid" data-wrap-cols="true">
	<div role="row" class="grid">
		<div role="gridcell" data-roving-tab-target>
			A
		</div>
		<div role="gridcell">
			<a data-roving-tab-target href="some.html">Help center</a>
		</div>
	</div>
</div>

Options

Currently it implement 3 behaviour on column end:

1. Stop (default). Just stop when reach the end. Used when data is not the same type.
2. Loop data-loop-cols || data-loop-rows. Move to the start when reach the end. Used when row or column has the same type of data.
3. Wrap data-wrap-cols || data-wrap-rows. Move to the next row/col when reach the end. Used when columns and rows has the same type of data.

Ex:

<div role="grid" data-wrap-cols="true" data-wrap-rows="true"></div>