Segmented Buttons

Segmented buttons allow users to toggle the selected states of grouped buttons.

Using segmented buttons

Installation

npm install @loipham/material-segmented-button

Basic Usage

HTML Structure

<div class="mdc-segmented-button" role="group">
  <button class="mdc-segmented-button__segment" aria-pressed="false">
    <i class="material-icons mdc-segmented-button__icon">favorite</i>
  </button>
  <button class="mdc-segmented-button__segment" aria-pressed="false">
    <div class="mdc-segmented-button__label">Sample Text</div>
  </button>
  <button class="mdc-segmented-button__segment" aria-pressed="false">
    <i class="material-icons mdc-segmented-button__icon">favorite</i>
    <div class="mdc-segmented-button__label">Sample Text</div>
  </button>
</div>

Styles

@use '@loipham/material-ripple/common';
@use '@loipham/material-segmented-button/styles';

JavaScript Instantiation

import {MDCSegmentedButton} from '@loipham/material-segmented-button';
const segmentedButtonEl = document.querySelector('.mdc-segmented-button');
const segmentedButton = new MDCSegmentedButton(segmentedButtonEl);

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

The MDC Segmented Button component automatically instantiates the child MDC Segmented Button Segment components.

Icons

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, FontAwesome, or any other icon library you wish.

Segmented Button

Multi select

By default, the segmented button allows any number of segments to be selected at a time so that each segment is independent from the rest.

For accessibility, the segments are treated as toggle buttons. The segmented button is assigned role="group" and each segment has the attribute aria-pressed with a boolean value corresponding to its selected state.

<div class="mdc-segmented-button" role="group">
  <button class="mdc-segmented-button__segment" aria-pressed="false">
    <i class="material-icons mdc-segmented-button__icon">favorite</i>
  </button>
  <button class="mdc-segmented-button__segment" aria-pressed="false">
    <div class="mdc-segmented-button__label">Sample Text</div>
  </button>
  <button class="mdc-segmented-button__segment" aria-pressed="false">
    <i class="material-icons mdc-segmented-button__icon">favorite</i>
    <div class="mdc-segmented-button__label">Sample Text</div>
  </button>
</div>

Single select

The segmented button can be limited to select only one segment at a time. In this case, the selected segment cannot be unselected with a click. Selecting a different segment will unselect the previously selected segment. To make the segmented button single select, add the class mdc-segmented-button--single-select.

For accessibility, the segments are treated as radio buttons. The segmented button is assigned role="radiogroup" and each segment is assigned role="radio" and has the attribute aria-checked with a boolean value corresponding to its selected state.

<div class="mdc-segmented-button mdc-segmented-button--single-select" role="radiogroup">
  <button class="mdc-segmented-button__segment" role="radio" aria-checked="false">
    <i class="material-icons mdc-segmented-button__icon">favorite</i>
  </button>
  <button class="mdc-segmented-button__segment" role="radio" aria-checked="false">
    <div class="mdc-segmented-button__label">Sample Text</div>
  </button>
  <button class="mdc-segmented-button__segment" role="radio" aria-checked="false">
    <i class="material-icons mdc-segmented-button__icon">favorite</i>
    <div class="mdc-segmented-button__label">Sample Text</div>
  </button>
</div>

Segment

The segment is assumed to be a child of a segmented button. The segment can be in a selected or unselected state and changes state if the button is clicked or if the segmented button tells it to change its state. If the parent segmented button is single select and the segment is selected, the segment will not become unselected if it is clicked.

The segment can contain an icon, text, or both. If both an icon and text are used, the icon is assumed to come first (unless the page is loaded as rtl). Ripple effects and touch support can also be added.

Segment with text

To insert text inside of a segment, add the class mdc-segmented-button__label.

<button class="mdc-segmented-button__segment">
  <div class="mdc-segmented-button__label">Sample Text</div>
</button>

Segment with an icon

To insert an icon inside of a segment, add the class mdc-segmented-button__icon.

<button class="mdc-segmented-button__segment">
  <i class="material-icons mdc-segmented-button__icon">favorite</i>
</button>

Selected segment

The segment will remain in a visually toggled state while selected. To select the segment by default, add the class mdc-segmented-button__segment--selected and set the attribute aria-pressed or aria-checked (if the segmented button is multi or single select, respectively) to true.

<button class="mdc-segmented-button__segment mdc-segmented-button__segment--selected" aria-pressed="true">
  <div class="mdc-segmented-button__label">Sample Text</div>
</button>

Additional Information

Touch accessibility

Material Design spec advises that touch targets should be at least 48 x 48 px. To meet this requirement, add the following to your segments:

<div class="mdc-touch-target-wrapper">
  <button class="mdc-segmented-button__segment mdc-segmented-button--touch">
    <div class="mdc-segmented-button__touch"></div>
    <div class="mdc-segmented-button__label">Sample Text</div>
  </button>
</div>

Ripple

To include ripple effects when a segment is clicked add the following classes to the segment:

<button class="mdc-segmented-button__segment">
  <div class="mdc-segmented-button__ripple"></div>
  <div class="mdc-segmented-button__label">Sample Text</div>
</button>

Keyboard navigation

Each segment within the segmented button is a tabbable element. Arrow key navigation between segments is not supported at this time.

Style Customization

CSS Classes

CSS Class	Description
`mdc-segmented-button`	Mandatory. Indicates the wrapper for child segments.
`mdc-segmented-button__single-select`	Optional. Indicates the segmented button only allows one segment to be selected at a time.
`mdc-segmented-button__segment`	Mandatory. Indicates a button element that can be selected.
`mdc-segmented-button__icon`	Optional. Indicates an icon in the segment. We recommend using Material Icons from Google Fonts.
`mdc-segmented-button__label`	Optional. Indicates text in the segment.
`mdc-segmented-button__segment--selected`	Optional. Indicates that the segment is selected.
`mdc-touch-target-wrapper`	Optional. Indicates contained segment has touch target support.
`mdc-segmented-button--touch`	Optional. Indicates the segment has touch target support.
`mdc-segmented-button__touch`	Optional. Indicates the segment has touch target support.
`mdc-segmented-button__ripple`	Optional. Indicates the segment has a ripple effect when clicked.

NOTE: Every segment element must contain an icon with class mdc-segmented-button__icon, text with class mdc-segmented-button__label, or both.

NOTE: While mdc-touch-target-wrapper, mdc-segmented-button--touch, and mdc-segmented-button__touch are optional, if one is used then all three must be used.

Sass Mixins

Mixin	Description
`outline-color`	Customizes the border color around each segment.
`unselected-ink-color`	Customizes the text and icon ink color for an unselected segment.
`unselected-container-fill-color`	Customizes the background color for an unselected segment.
`selected-ink-color`	Customizes the text and icon ink color for a selected segment.
`selected-container-fill-color`	Customizes the background color for an selected segment.

`MDCSegmentedButton`, `MDCSegmentedButtonSegment`, and `SegmentDetail` Properties and Methods

The MDC Segmented Button package is composed of two JavaScript classes:

MDCSegmentedButton defines the behavior of a set of segments.
MDCSegmentedButtonSegment defines the behavior of a single segment.

To use the MDCSegmentedButton and MDCSegmentedButtonSegment classes, import both from @loipham/material-segmented-button.

`SegmentDetail`

The SegmentDetail type contains only the actionable information about a specific MDCSegmentedButtonSegment.

Property	Value Type	Description
`index`	`number`	The index of the segment.
`selected`	`boolean`	The segment's selected state.
`segmentId?`	`string \| undefined`	The segment's segmentId, if provided.

`MDCSegmentedButton`

Method Signature	Description
`getSelectedSegments() => readonly SegmentDetail[]`	Proxies to foundation's `getSelectedSegments` method.
`selectSegment(indexOrSegmentId: number \| string) => void`	Proxies to foundation's `selectSegment` method.
`unselectSegment(indexOrSegmentId: number \| string) => void`	Proxies to foundation's `unselectSegment` method.
`isSegmentSelected(indexOrSegmentId: number \| string) => boolean`	Proxies to foundation's `isSegmentSelected` method.

Property	Value Type	Description
`segments`	`ReadOnlyArray<MDCSegmentedButtonSegment>`	Array of child `MDCSegmentedButtonSegment`s.
`ripple`	`MDCRipple` (read-only)	The `MDCRipple` instance for the root element that `MDCSegmentedButton` initializes.

Events

Event Name	`event.detail`	Description
MDCSegmentedButton:change	`SegmentDetail`	Indicates that a segment's selected value may have changed due to a click.

`MDCSegmentedButtonSegment`

Method Signature	Description
`setIndex(index: number) => void`	Sets segment's index.
`setIsSingleSelect(isSingleSelect: boolean) => void`	Sets segment's isSingleSelect.
`isSelected() => boolean`	Proxies to foundation's `isSelected` method.
`setSelected() => void`	Proxies to foundation's `setSelected` method.
`setUnselected() => void`	Proxies to foundation's `setUnselected` method.
`getSegmentId() => string \| undefined`	Proxies to foundation's `getSegmentId` method.

Events

Event Name	`event.detail`	Description
`MDCSegmentedButtonSegment:selected`	`SegmentDetail`	Indicates the segment's selected status just changed due to a click.

Usage within Web Frameworks

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

Adapters: `MDCSegmentedButtonAdapter` and `MDCSegmentedButtonSegmentAdapter`

See segmented-button/component.ts and segment/component.ts for vanilla DOM implementations of these adapter APIs for reference.

`MDCSegmentedButtonAdapter`

Method Signature	Description
`hasClass(className: string) => boolean`	Returns true if segmented button has className, otherwise returns false.
`getSegments() => readonly SegmentDetail[]`	Returns child segments represented as a readonly list of SegmentDetails.
`selectSegment(indexOrSegmentId: number \| string) => void`	Sets identified segment to be selected.
`unselectSegment(indexOrSegmentId: number \| string) => void`	Set identified segment to be not selected.
`notifySelectedChange(detail: SegmentDetail) => void`	Notifies the client about the changed segment with a `change` event.

NOTE: notifySelectedChange must pass along a SegmentDetail representing the potentially changed Segment, and must be observable by the client (e.g. via DOM event bubbling).

`MDCSegmentedButtonSegmentAdapter`

Method Signature	Description
`isSingleSelect() => boolean`	Returns true if wrapping segmented button is single select, otherwise returns false.
`getAttr(attrName: string) => string \| null`	Returns root element's attribute if it is set, otherwise returns null.
`setAttr(attrName: string, value: string) => void`	Sets root element's attribute value to `value`.
`addClass(className: string) => void`	Adds class to the root element.
`removeClass(className: string) => void`	Removes class from the root element.
`hasClass(className: string) => boolean`	Returns true if root element has class, otherwise returns false.
`notifySelectedChange(selected: boolean) => void`	Notifies the Segmented Button that the segment's selected state has changed.

NOTE: notifySelectedChange must pass along a SegmentDetail representing the Segment, and must be observable by the mdc-segmented-button element (e.g. via DOM event bubbling).

Foundations: `MDCSegmentedButtonFoundation` and `MDCSegmentedButtonSegmentFoundation`

`MDCSegmentedButtonFoundation`

Method Signature	Description
`selectSegment(indexOrSegmentId: number \| string) => void`	Sets identified segment to be selected.
`unselectSegment(indexOrSegmentId: number \| string) => void`	Set identified segment to be not selected.
`getSelectedSegments() => readonly SegmentDetail[]`	Returns selected segments as readonly list of SegmentDetails.
`isSegmentSelected(indexOrSegmentId: number \| string) => boolean`	Returns true if identified segment is selected, otherwise returns false.
`isSingleSelect() => boolean`	Returns true if segmented button is single select, otherwise returns false.
`handleSelected(detail: SegmentDetail) => void`	Handles a `selected` event. Maintains single select restrictions, if applicable, and notifies client.

`MDCSegmentedButtonFoundation` Event Handlers

When wrapping the Segmented Button foundation, the following events must be bound to the indicated foundation methods:

Events	Element Selector	Foundation Handler
`MDCSegmentedButtonSegment:selected`	`.mdc-segmented-button` (root)	`handleSelected`

`MDCSegmentedButtonSegmentFoundation`

Method Signature	Description
`isSelected() => void`	Returns true if segment is currently selected.
`setSelected() => void`	Sets segment to be selected.
`setUnselected() => void`	Sets segment to be not selected.
`getSegmentId() => string \| undefined`	Returns segment's segmentId if it was provided, otherwise return undefined.
`handleClick() => void`	Handles a `click` event. Changes selected state if able (due to single select) and notifies Segmented Button.

`MDCSegmentedButtonSegmentFoundation` Event Handlers

When wrapping the Segment foundation, the following events must be bound to the indicated foundation methods:

Events	Element Selector	Foundation Handler
`click`	`.mdc-segmented-button__segment` (root)	`handleClick`

@loipham/material-segmented-button

Segmented Buttons

Using segmented buttons

Installation

Basic Usage

HTML Structure

Styles

JavaScript Instantiation

Icons

Segmented Button

Multi select

Single select

Segment

Segment with text

Segment with an icon

Selected segment

Additional Information

Touch accessibility

Ripple

Keyboard navigation

Style Customization

CSS Classes

Sass Mixins

MDCSegmentedButton, MDCSegmentedButtonSegment, and SegmentDetail Properties and Methods

SegmentDetail

MDCSegmentedButton

Events

MDCSegmentedButtonSegment

Events

Usage within Web Frameworks

Adapters: MDCSegmentedButtonAdapter and MDCSegmentedButtonSegmentAdapter

MDCSegmentedButtonAdapter

MDCSegmentedButtonSegmentAdapter

Foundations: MDCSegmentedButtonFoundation and MDCSegmentedButtonSegmentFoundation

MDCSegmentedButtonFoundation

MDCSegmentedButtonFoundation Event Handlers

MDCSegmentedButtonSegmentFoundation

MDCSegmentedButtonSegmentFoundation Event Handlers

/@loipham/material-segmented-button/

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`MDCSegmentedButton`, `MDCSegmentedButtonSegment`, and `SegmentDetail` Properties and Methods

`SegmentDetail`

`MDCSegmentedButton`

`MDCSegmentedButtonSegment`

Adapters: `MDCSegmentedButtonAdapter` and `MDCSegmentedButtonSegmentAdapter`

`MDCSegmentedButtonAdapter`

`MDCSegmentedButtonSegmentAdapter`

Foundations: `MDCSegmentedButtonFoundation` and `MDCSegmentedButtonSegmentFoundation`

`MDCSegmentedButtonFoundation`

`MDCSegmentedButtonFoundation` Event Handlers

`MDCSegmentedButtonSegmentFoundation`

`MDCSegmentedButtonSegmentFoundation` Event Handlers

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