What is it

A tabs component that provides different sections of content that are displayed one at a time when the user selects that information.

When to use it

The tabbed user interface enables users to jump to their target section quickly. Tabs present like logically group information on the same page. Information should

Users should not need to see content of multiple tabs simultaneously and the user should be able to easily recognise where they are within the content.

How to use it

The structure of the tab set is defined in html. There are two forms supported. Adding a class of .tab-group to the container element will work in place of the tabset tag, and the tab panels can be defined using either tab="" or data-tab="". Passing an optional element to the init function will initialise tabs within that element. 

        
          

          

        
tabset#uniqueID
	div(tab="[tab title]")
	div(tab="[tab title]")
		
tabset, .tab-group {
	margin: 2rem 0 1rem 0;
}
tabset > ul, .tab-group > ul {
	display: -webkit-box;
	display: -ms-flexbox;
	display: flex;
	margin: 0;
	padding: 0;
}
tabset > ul li.separator, .tab-group > ul li.separator {
	border-bottom: 1px solid #7f7f7f;
	border-left: 1px solid #7f7f7f;
	display: inline-block;
	margin: 0.45rem 0 0 0;
	width: 100%;
}
tabset .tab-hidden, .tab-group .tab-hidden {
	display: none;
}
tabset [role=tab], .tab-group [role=tab] {
	background-color: #FFF;
	border-left: 1px solid #7f7f7f;
	border-top: 1px solid #7f7f7f;
	border-radius: 0.5rem 0.5rem 0 0;
	cursor: pointer;
	margin: 0;
	display: inline;
	padding: 1rem 1.5rem 0.14rem 1.5rem;
	z-index: 2;
}
tabset [role=tab]:last-of-type, .tab-group [role=tab]:last-of-type {
	border-right: 1px solid #7f7f7f;
}
tabset [role=tab]:not(.selected), .tab-group [role=tab]:not(.selected) {
	background-color: #f0f0f0;
	border-bottom: 1px solid #7f7f7f;
}
tabset [role=tab] span, .tab-group [role=tab] span {
	display: block;
	margin: 0 0 0.5rem 0;
}
tabset [role=tabpanel], .tab-group [role=tabpanel] {
	background-color: #FFF;
	border: 1px solid #7f7f7f;
	border-top: none;
	padding: 1rem;
	z-index: 1;
}
tabset [role=tabpanel]:not(.open), .tab-group [role=tabpanel]:not(.open) {
	display: none;
}
@import "[path to]/_tabs";
@include tabs{ 
	// optional content block
};

//		DS2 core (c) 2024 Alexander McIlwraith 
//		Licensed under CC BY-SA 4.0 

$tab-border: #7f7f7f !default; 
$tab-selected: #FFF !default;
$tab-notselected: #f0f0f0 !default;

@mixin tabs {
	tabset, .tab-group {
		margin: 2rem 0 1rem 0;
		> ul {
			display: flex;
			margin: 0;
			padding: 0;

			li.separator {	
				border-bottom: 1px solid $tab-border;
				border-left: 1px solid $tab-border;
				display: inline-block;
				margin: .45rem 0 0 0;
				width: 100%;
			}
		}

		.tab-hidden {
			display: none;
		}

		[role="tab"] {
			background-color: $tab-selected;
			border-left: 1px solid $tab-border;
			border-top: 1px solid $tab-border;
			border-radius: .5rem .5rem 0 0;
			cursor:pointer;
			margin: 0;
			display: inline;
			padding: 1rem 1.5rem .14rem 1.5rem;
			z-index: 2;
			
			&:last-of-type {
				border-right: 1px solid $tab-border;
			}

			&:not(.selected) {
				background-color: $tab-notselected;
				border-bottom: 1px solid $tab-border;
			}

			span {
				display: block;
				margin: 0 0 .5rem 0;
			}

		}
		[role="tabpanel"] {
			background-color: $tab-selected;
			border: 1px solid $tab-border;
			border-top: none;
			padding: 1rem;
			z-index: 1;

			&:not(.open) {
				display: none;
			}
			@content;

		}
	}
}
import * as tabs from "[path to]/_tabs.js";
tabs.init();
/*  DS2 core (c) 2024 Alexander McIlwraith 
	import * as tabs from "../pg/patterns/layouts/tabs/_tabs.js";
	tabs.init();
 */

export function init(p = document) { 
	p.querySelectorAll(".tab-group, tabset").forEach(tabGroup => {

		if (tabGroup.querySelector("[role=tablist]") === null) {
			const tabgroup = tabGroup.getAttribute("id");
			let tablist = "";

			Array.from(tabGroup.children).forEach(child => {
				const tab = child.getAttribute("tab") || child.getAttribute("data-tab");
				if (tab !== null) {
					const tabID = tab.replace(/\W+/g, "-").toLowerCase();
					const tabPanel = document.createElement('div');
					tabPanel.id = `tab-panel-${tabgroup}-${tabID}`;
					tabPanel.className = tablist === "" ? "open" : "";
					tabPanel.setAttribute("role", "tabpanel");
					tabPanel.setAttribute("tabindex", "0");
					tabPanel.setAttribute("aria-labelledby", `tab-${tabgroup}-${tabID}`);
					tabPanel.appendChild(child.cloneNode(true));
					child.parentNode.replaceChild(tabPanel, child);
					tablist += ``;
				} else {
					child.classList.add("tab-hidden");
				}
			});

			const ul = document.createElement('ul');
			ul.setAttribute("role", "tablist");
			ul.innerHTML = `${tablist}`;
			tabGroup.insertBefore(ul, tabGroup.firstChild);

			tabGroup.querySelectorAll('[role="tab"]').forEach(tab => {
				tab.addEventListener("click", () => {
					const siblings = Array.from(tab.parentNode.children);
					siblings.forEach(sibling => sibling.classList.remove("selected"));
					tab.classList.add("selected");

					const tabPanels = Array.from(tab.parentNode.parentNode.children)
										   .filter(child => child.getAttribute("role") === "tabpanel");
					tabPanels.forEach(panel => panel.classList.remove("open"));

					const tabPanelId = tab.getAttribute("id").replace("tab", "tab-panel");
					document.getElementById(tabPanelId).classList.add("open");
				});
			});
			
		}
	});
}