Tab Bar

Tabs organize and allow navigation between groups of content that are related and at the same level of hierarchy.
The Tab Bar contains the Tab Scroller and Tab components.

Design & API Documentation

• 
  Material Design guidelines: Tabs
  


• 
  Demo
  

Installation

``
npm install @limetech/mdc-tab-bar
`

Basic Usage

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`html


`scss
@import "@limetech/mdc-tab-bar/mdc-tab-bar";
@import "@limetech/mdc-tab-scroller/mdc-tab-scroller";
@import "@limetech/mdc-tab-indicator/mdc-tab-indicator";
@import "@limetech/mdc-tab/mdc-tab";
`

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`js
import {MDCTabBar} from '@limetech/mdc-tab-bar';

const tabBar = new MDCTabBar(document.querySelector('.mdc-tab-bar'));
`

> See Importing the JS component for more information on how to import JavaScript.

Variants

MDC Tab Bar does not have any variants; however, its subcomponents do. See the Tab Scroller,
Tab, and Tab Indicator documentation for more information.

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We recommend using Material Icons from Google Fonts:

`html



`

However, you can also use SVG, Font Awesome, or any other icon library you wish.

Style Customization

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CSS Class | Description
--- | ---
mdc-tab-bar | Mandatory.

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To customize the width of the tab bar, use the following mixin.

Mixin | Description
--- | ---
mdc-tab-bar-width($width) | Customizes the width of the tab bar.
mdc-tab-bar-density($density-scale) | Sets density scale to default tab bar variant. Use mdc-tab-bar-stacked-density mixin for stacked variant. Supported density scales -4, -3, -2, -1 and 0.
mdc-tab-bar-stacked-density($density-scale) | Sets density scale to stacked tab bar variant. Supported density scales -4, -3, -2, -1 and 0.
mdc-tab-bar-tab-scroller-transition($duration-ms, $timing-function) | Sets the CSS transition for the tab scrolling animation. This mixin is a proxy to mdc-tab-scroller-transition mixin.

MDCTabBar Properties and Methods

Property | Value Type | Description
--- | --- | ---
focusOnActivate | boolean (write-only) | Sets whether tabs focus themselves when activated. Defaults to true.
useAutomaticActivation | boolean (write-only) | Sets how tabs activate in response to keyboard interaction. Automatic (true) activates as soon as a tab is focused with arrow keys; manual (false) activates only when the user presses space/enter. The default is automatic (true).

Method Signature | Description
--- | ---
activateTab(index: number) => void | Activates the tab at the given index.
scrollIntoView(index: number) => void | Scrolls the tab at the given index into view.

Event Name | Event Data Structure | Description
--- | --- | ---
MDCTabBar:activated | {"detail": {"index": number}} | Emitted when a Tab is activated with the index of the activated Tab. Listen for this to update content when a Tab becomes active.

Usage within Web Frameworks

If you are using a JavaScript framework, such as React or Angular, you can create a Tab Bar for your framework. Depending on your needs, you can use the _Simple Approach: Wrapping MDC Web Vanilla Components_, or the _Advanced Approach: Using Foundations and Adapters_. Please follow the instructions here.

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Method Signature | Description
--- | ---
scrollTo(scrollX: number) => void | Scrolls the Tab Scroller to the given position.
incrementScroll(scrollXIncrement: number) => void | Increments the Tab Scroller by the given value.
getScrollPosition() => number | Returns the scroll position of the Tab Scroller.
getScrollContentWidth() => number | Returns the width of the Tab Scroller's scroll content element.
getOffsetWidth() => number | Returns the offsetWidth of the root element.
isRTL() => boolean | Returns if the text direction is RTL.
setActiveTab(index: number) => void | Sets the tab at the given index to be activated.
activateTabAtIndex(index: number, clientRect: ClientRect) => void | Activates the Tab at the given index with the given clientRect.
deactivateTabAtIndex(index) => void | Deactivates the Tab at the given index.
focusTabAtIndex(index: number) => void | Focuses the Tab at the given index.
getTabIndicatorClientRectAtIndex(index: number) => ClientRect | Returns the client rect of the Tab at the given index.
getTabDimensionsAtIndex(index) => MDCTabDimensions | Returns the dimensions of the Tab at the given index.
getTabListLength() => number | Returns the number of child Tab components.
getPreviousActiveTabIndex() => number | Returns the index of the previously active Tab.
getFocusedTabIndex() => number | Returns the index of the focused Tab.
getIndexOfTabById(id: string) => number | Returns the index of the given Tab ID.
notifyTabActivated(index: number) => void | Emits the MDCTabBar:activated event.

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Method Signature | Description
--- | ---
activateTab(index: number) => void | Activates the tab at the given index.
setUseAutomaticActivation(useAutomaticActivation: boolean) => void | Sets how tabs activate in response to keyboard interaction. Automatic (true) activates as soon as a tab is focused with arrow keys; manual (false) activates only when the user presses space/enter.
handleKeyDown(evt: Event) => void | Handles the logic for the "keydown" event.
handleTabInteraction(evt: Event) => void | Handles the logic for the "MDCTab:interacted" event.
scrollIntoView(index: number) => void` | Scrolls the Tab at the given index into view.