Tab Scroller

A Tab Scroller allows for smooth native and animated scrolling of tabs.

Design & API Documentation

• Material Design guidelines: Scrollable Tabs
• Demo

Installation

npm install @material/tab-scroller

Basic Usage

HTML Structure

<div class="mdc-tab-scroller">
  <div class="mdc-tab-scroller__scroll-area">
    <div class="mdc-tab-scroller__scroll-content"></div>
  </div>
</div>

Styles

@use "@material/tab-scroller/mdc-tab-scroller";

JavaScript Instantiation

import {MDCTabScroller} from '@material/tab-scroller';

const tabScroller = new MDCTabScroller(document.querySelector('.mdc-tab-scroller'));

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

Style Customization

CSS Classes

CSS Class	Description
mdc-tab-scroller	Mandatory. Contains the tab scroller content.
mdc-tab-scroller__scroll-area	Mandatory. Denotes the scrolling area.
mdc-tab-scroller__scroll-content	Mandatory. Denotes the scrolling content.
mdc-tab-scroller--align-start	Optional. Sets the elements inside the scroll content element to be aligned to the start of the scroll content element.
mdc-tab-scroller--align-end	Optional. Sets the elements inside the scroll content element to be aligned to the end of the scroll content element.
mdc-tab-scroller--align-center	Optional. Sets the elements inside the scroll content element to be aligned to the center of the scroll content element.

NOTE: The align modifier classes are only applicable when the contents do not meet or exceed the width of the Tab Scroller and Tab Bar (i.e., most commonly, when mdc-tab--min-width is used on each tab).

Sass Mixins

Mixin	Description
transition($duration-ms, $timing-function)	Sets the scroll animation duration and, optionally, the timing function.

MDCTabScroller Methods

Method Signature	Description
scrollTo(scrollX: number) => void	Scrolls to the scrollX value.
incrementScroll(scrollX: number) => void	Increments the current scroll value by the scrollX value using animation.
incrementScrollImmediate(scrollX: number) => void	Increments the current scroll value by the scrollX value without animation.
getScrollPosition() => number	Returns the current visual scroll position.
getScrollContentWidth() => number	Returns the width of the scroll content element.

Usage within Web Frameworks

If you are using a JavaScript framework, such as React or Angular, you can create a Tab Scroller 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.

MDCTabScrollerAdapter

Method Signature	Description
eventTargetMatchesSelector(eventTarget: EventTarget, selector: string) => boolean	Returns true if the given event target satisfies the given CSS selector.
addClass(className: string) => void	Adds a class to the root element.
addScrollAreaClass(className: string) => void	Adds a class to the scroll area element.
removeClass(className: string) => void	Removes a class from the root element.
setScrollAreaStyleProperty(property: string, value: string) => void	Sets the given style property on the scroll area element.
setScrollContentStyleProperty(property: string, value: string) => void	Sets the given style property on the scroll content element.
getScrollContentStyleValue(property: string) => string	Returns the given style property value on the scroll content element.
setScrollAreaScrollLeft(scrollLeft: number) => void	Sets the scroll area element's scrollLeft.
getScrollAreaScrollLeft() => number	Returns the scroll area element's scrollLeft.
getScrollContentOffsetWidth() => number	Returns the scroll content element's offsetWidth.
getScrollAreaOffsetWidth() => number	Returns the scroll area element's offsetWidth.
computeScrollAreaClientRect() => ClientRect	Returns the bounding client rect of the scroll area element.
computeScrollContentClientRect() => ClientRect	Returns the bounding client rect of the scroll content element.
computeHorizontalScrollbarHeight() => number	Returns the height of the browser's horizontal scrollbars (in px).

util Functions

MDC Tab Scroller provides a util module with functions to help implement adapter methods.

Function Signature	Description
computeHorizontalScrollbarHeight(document: Document) => number	Returns the height of the browser's horizontal scrollbars (in px).

MDCTabScrollerFoundation

Method Signature	Description
getRTLScroller() => MDCTabScrollerRTL	Creates an RTL Scroller instance for the current browser.
getScrollPosition() => number	Returns the current visual scroll position.
handleInteraction() => void	Responds to mouse, pointer, touch, and keyboard events.
handleTransitionEnd(evt: Event) => void	Responds to a transitionend event on the mdc-tab-scroller__scroll-content element.
incrementScroll(scrollX: number) => void	Increments the current scroll value by the scrollX value.
scrollTo(scrollX: number) => void	Scrolls to the scrollX value.

MDCTabScrollerRTL

Abstract class with three concrete implementations depending on the browser:

• MDCTabScrollerRTLDefault
• MDCTabScrollerRTLNegative
• MDCTabScrollerRTLReverse

Method Signature	Description
getAnimatingScrollPosition(scrollX: number, translateX: number) => number	Returns the current scroll position during animation.
getScrollPositionRTL(translateX: number) => number	Returns the number of px the user has scrolled horizontally, relative to the leading edge.
incrementScrollRTL(scrollX: number) => MDCTabScrollerAnimation	Returns an object containing the values required to animate from the current scroll position to a new scroll position.
scrollToRTL(scrollX: number) => MDCTabScrollerAnimation	Scrolls content horizontally to the given position in an RTL-friendly way.