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@shortcm/tab-indicator

v0.43.0

Published

The Material Components for the web tab indicator component

Downloads

2

Vulnerabilities

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Links

Git

Maintainers

lyubov-voloshkolyubov-voloshkokostenkokostenko

Keywords

material componentsmaterial designtabindicator

Readme

Tab Indicator

A Tab Indicator is a visual guide that shows which Tab is active.

Design & API Documentation

Installation

npm install @material/tab-indicator

Basic Usage

HTML Structure

<span class="mdc-tab-indicator">
  <span class="mdc-tab-indicator__content"></span>
</span>

Styles

@import "@material/tab-indicator/mdc-tab-indicator";

JavaScript Instantiation

import {MDCTabIndicator} from '@material/tab-indicator';

const tabIndicator = new MDCTabIndicator(document.querySelector('.mdc-tab-indicator'));

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

Variants

Active Indicator

Add the mdc-tab-indicator--active class to the mdc-tab-indicator element to make the Tab Indicator active.

Indicator Types and Transitions

The Tab Indicator may be represented in one of two ways:

  • Underline, indicated by the mdc-tab-indicator__content--underline class
  • Icon, indicated by the mdc-tab-indicator__content--icon class

NOTE: One of these classes must be applied to the Tab Indicator's content element.

The Tab Indicator may transition in one of two ways:

  • Slide, the default behavior
  • Fade, indicated by the mdc-tab-indicator--fade class

Sliding Underline Indicator

<span class="mdc-tab-indicator">
  <span class="mdc-tab-indicator__content mdc-tab-indicator__content--underline"></span>
</span>

Icon Indicators

We recommend using Material Icons from Google Fonts:

<head>
  <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
</head>

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

Remember to include aria-hidden="true", since the active indicator is already signified via the aria-selected attribute on the tab.

Fading Icon Indicator
<span class="mdc-tab-indicator mdc-tab-indicator--fade">
  <span class="mdc-tab-indicator__content mdc-tab-indicator__content--icon material-icons" aria-hidden="true">star</span>
</span>
Sliding Icon Indicator
<span class="mdc-tab-indicator">
  <span class="mdc-tab-indicator__content mdc-tab-indicator__content--icon material-icons" aria-hidden="true">star</span>
</span>

Style Customization

CSS Classes

CSS Class | Description --- | --- mdc-tab-indicator | Mandatory. Contains the tab indicator content. mdc-tab-indicator__content | Mandatory. Denotes the tab indicator content. mdc-tab-indicator--active | Optional. Visually activates the indicator. mdc-tab-indicator--fade | Optional. Sets up the tab indicator to fade in on activation and fade out on deactivation. mdc-tab-indicator__content--underline | Optional. Denotes an underline tab indicator. mdc-tab-indicator__content--icon | Optional. Denotes an icon tab indicator.

NOTE: Exactly one of the --underline or --icon content modifier classes should be present.

Sass Mixins

To customize the tab indicator, use the following mixins.

Mixin | Description --- | --- mdc-tab-indicator-surface | Mandatory. Must be applied to the parent element of the mdc-tab-indicator. mdc-tab-indicator-underline-color($color) | Customizes the color of the underline. mdc-tab-indicator-icon-color($color) | Customizes the color of the icon subelement. mdc-tab-indicator-underline-height($height) | Customizes the height of the underline. mdc-tab-indicator-icon-height($height) | Customizes the height of the icon subelement. mdc-tab-indicator-underline-top-corner-radius($radius) | Customizes the top left and top right border radius of the underline child element.

MDCTabIndicator Methods

Method Signature | Description --- | --- activate(previousIndicatorClientRect?: ClientRect) => void | Activates the tab indicator. deactivate() => void | Deactivates the tab indicator. computeContentClientRect() => ClientRect | Returns the content element bounding client rect.

Usage within Web Frameworks

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

MDCTabIndicatorAdapter

Method Signature | Description --- | --- addClass(className: string) => void | Adds a class to the root element. removeClass(className: string) => void | Removes a class from the root element. setContentStyleProp(property: string, value: string) => void | Sets the style property of the content element. computeContentClientRect() => ClientRect | Returns the content element's bounding client rect.

MDCTabIndicatorFoundation

Method Signature | Description --- | --- handleTransitionEnd(evt: Event) => void | Handles the logic for the "transitionend" event on the root element. activate(previousIndicatorClientRect?: ClientRect) => void | Activates the tab indicator. deactivate() => void | Deactivates the tab indicator. computeContentClientRect() => ClientRect | Returns the content element's bounding client rect.