@agencecinq/tabs

@agencecinq/tabs

Tabulation partout, tabulation nulle part

Installation

pnpm add @agencecinq/tabs

Usage

Web Component (<cinq-tabs>)

<cinq-tabs class="js-tabs" data-tabs-hash="true">
  <div role="tablist" aria-label="navigation">
    <button
      type="button"
      class="is-active"
      role="tab"
      aria-selected="true"
      aria-controls="home-tab"
      id="home"
    >
      Home
    </button>
    <button
      type="button"
      role="tab"
      aria-selected="false"
      aria-controls="project-tab"
      id="project"
      tabindex="-1"
    >
      Project
    </button>
    <button
      type="button"
      role="tab"
      aria-selected="false"
      aria-controls="contact-tab"
      id="contact"
      tabindex="-1"
      data-deletable
    >
      Contact
    </button>
  </div>

  <section tabindex="0" role="tabpanel" aria-labelledby="home" id="home-tab">
    …
  </section>
  <section tabindex="0" role="tabpanel" aria-labelledby="project" id="project-tab">
    …
  </section>
  <section tabindex="0" role="tabpanel" aria-labelledby="contact" id="contact-tab">
    …
  </section>
</cinq-tabs>

import "@agencecinq/tabs";

Why nothing needs to be initialized

When you import @agencecinq/tabs, the module registers the Web Component in the Custom Elements Registry:

customElements.define('cinq-tabs', Tabs);

The browser then automatically “upgrades” every existing <cinq-tabs> in the DOM: it instantiates the Tabs class, calls its connectedCallback, which in turn calls init().
You don’t need to do new Tabs(...) or call init() manually – writing the markup and importing the module is enough.

Tablist

The element that serves as a container for the set of tabs. The role="tablist" attribute is required.
The aria-label="" attribute provides a label that describes the purpose of the set of tabs.

The role="tablist"needs to be on a container element such as a <div>, <nav>, or <section>. It should not be placed on a <ul> element. Direct children of the tablist must be the tab elements with role="tab".

<div role="tablist" aria-label="navigation">
	<button
		type="button"
		class="is-active"
		role="tab"
		aria-selected="true"
		aria-controls="home-tab"
		id="home"
	>
		Home
	</button>
	<button
		type="button"
		role="tab"
		aria-selected="false"
		aria-controls="project-tab"
		id="project"
		tabindex="-1"
	>
		Project
	</button>
	<button
		type="button"
		role="tab"
		aria-selected="false"
		aria-controls="contact-tab"
		id="contact"
		tabindex="-1"
		data-deletable=""
	>
		Contact
	</button>
</div>

Tab

An element in the tab list that serves as a label for one of the tab panels and can be activated to display that panel.

<button
	type="button"
	role="tab"
	aria-selected="false"
	aria-controls="foo-tab"
	id="foo"
	tabindex="-1"
>
	Project
</button>

The role="tab" attribute is required.

The aria-controls="foo-tab" refers to the id of the tabpanel element associated with the tab.

Since an HTML button element is used for the tab, it is not necessary to set tabindex="0" on the selected (active) tab element.

Is the tabulation deletable? You can set up this option by adding the data-deletable attribute on button.

To active the button on first load, add a is-active class to the button, remove the tabindex attribute and switch to true the aria-selected attribute.

Tabpanel

The element that contains the content associated with a tab.

<section tabindex="0" role="tabpanel" aria-labelledby="foo" id="foo-tab">
	<p>
		The galeb duhr is a curious boulder-like creature with appendages that act as hands and feet.
		These intelligent beings are very large and slow-moving. They live in rocky or mountainous
		areas where they can feel the earth power and control the rocks around them.
	</p>
</section>

To active panel on first load, add a is-active class to it.

Keyboard support

Key	Function
Tab	When focus moves into the tab list, places focus on the active tab element When the tab list contains the focus, moves focus to the next element in the tab sequence, which is the tabpanel element.
Enter Space	When a tab has focus, activates the tab, causing its associated panel to be displayed.
Right Arrow	When a tab has focus (LTR): moves focus to the next tab (wraps to first on last). In RTL, Right Arrow moves to the previous tab.
Left Arrow	When a tab has focus (LTR): moves focus to the previous tab (wraps to last on first). In RTL, Left Arrow moves to the next tab.
Home fn + left arrow	When a tab has focus, moves focus to the first tab.
End fn + right arrow	When a tab has focus, moves focus to the last tab.
Delete	When focus is on the Contact tab, removes the tab from the tab list and places focus on the previous tab.

RTL (right-to-left)

Navigation with Left/Right arrow keys follows the reading direction. If the tablist (or a parent) has dir="rtl" or inherits a right-to-left direction from CSS, "next" tab is triggered by Left Arrow and "previous" by Right Arrow, so keyboard behavior matches the visual order (e.g. Arabic, Hebrew).

Options

Options are configured via data attributes on the Web Component:

Attribute	Type	Default	Description
data-tabs-hash	boolean	true	Enables or disables synchronization of the active tab with location.hash.
data-tabs-delay	number	0	Delay in ms before automatic activation when the user navigates with arrow keys (0 = no delay, i.e. manual mode).

Events

Events are dispatched on the tab element (the button with role="tab"). Listen on the tab, or use event delegation from <cinq-tabs>.

Event	Cancelable	Detail	Description
tab-before-activate	Yes	{ index, controls, element }	Fired before activation. Call preventDefault() to cancel. For async work, cancel then call tabs.activateTab(index) when ready.
tab-activate	No	{ controls, element }	Fired when the tab is activated.
tab-delete	No	{ controls, element }	Fired when the tab is removed.

Method: activateTab(index)

On the <cinq-tabs> element (or the Tabs instance). Call after preventing tab-before-activate to complete activation (e.g. after loading data).

const tabsEl = document.querySelector('cinq-tabs');

tabsEl.addEventListener('tab-before-activate', (e) => {
  const { index, controls, element } = e.detail;

  // Optional: cancel and activate later (e.g. after async work)
  e.preventDefault();
  fetchData(controls).then(() => {
    tabsEl.activateTab(index);
  });
});

// Or: just listen to tab-activate (no cancel)
tabsEl.querySelectorAll('[role="tab"]').forEach((tab) => {
  tab.addEventListener('tab-activate', ({ detail }) => {
    console.log('activated', detail.controls, detail.element);
  });
});

Build Setup

# depuis la racine du monorepo CINQ
pnpm -C packages/tabs build

Acknowledgments

• Deciding When to Make Selection Automatically Follow Focus
• Example of Tabs with Manual Activation
• Example of Tabs with Automatic Activation
• Keycode by Wes Bos