Package Exports

@material/chips
@material/chips/chip-set/foundation
@material/chips/chip/foundation
@material/chips/dist/mdc.chips
@material/chips/dist/mdc.chips.css
@material/chips/dist/mdc.chips.js
@material/chips/index

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (@material/chips) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

Chips

Chips are compact elements that allow users to enter information, select a choice, filter content, or trigger an action.

Design & API Documentation

Installation

npm install @material/chips

Basic Usage

HTML Structure

<div class="mdc-chip-set">
  <div class="mdc-chip" tabindex="0">
    <div class="mdc-chip__text">Chip content</div>
  </div>
  ...
</div>

Styles

@import "@material/chips/mdc-chips";

JavaScript Instantiation

import {MDCChipSet} from '@material/chips';

const chipSet = new MDCChipSet(document.querySelector('.mdc-chip-set'));

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

Variants

Leading and Trailing Icons

You can optionally add a leading icon (i.e. thumbnail) and/or a trailing "remove" icon to a chip. To add an icon, add an i element with your preferred icon, give it a class of mdc-chip__icon, and a class of either mdc-chip__icon--leading or mdc-chip__icon--trailing.

Leading icon

<div class="mdc-chip">
  <i class="material-icons mdc-chip__icon mdc-chip__icon--leading">event</i>
  <div class="mdc-chip__text">Add to calendar</div>
</div>

Trailing icon

A trailing icon comes with the functionality to remove the chip from the set. If you're adding a trailing icon, also set tabindex="0" and role="button" to make it accessible by keyboard and screenreader. Trailing icons should only be added to input chips.

<div class="mdc-chip">
  <div class="mdc-chip__text">Jane Smith</div>
  <i class="material-icons mdc-chip__icon mdc-chip__icon--trailing" tabindex="0" role="button">cancel</i>
</div>

Choice Chips

Choice chips are a variant of chips which allow single selection from a set of options. To define a set of chips as choice chips, add the class mdc-chip-set--choice to the chip set element.

<div class="mdc-chip-set mdc-chip-set--choice">
  ...
</div>

Filter Chips

Filter chips are a variant of chips which allow multiple selection from a set of options. To define a set of chips as filter chips, add the class mdc-chip-set--filter to the chip set element. When a filter chip is selected, a checkmark appears as the leading icon. If the chip already has a leading icon, the checkmark replaces it. This requires the HTML structure of a filter chip to differ from other chips:

<div class="mdc-chip-set mdc-chip-set--filter">
  <div class="mdc-chip">
    <div class="mdc-chip__checkmark" >
      <svg class="mdc-chip__checkmark-svg" viewBox="-2 -3 30 30">
        <path class="mdc-chip__checkmark-path" fill="none" stroke="black"
              d="M1.73,12.91 8.1,19.28 22.79,4.59"/>
      </svg>
    </div>
    <div class="mdc-chip__text">Filterable content</div>
  </div>
  ...
</div>

To use a leading icon in a filter chip, put the mdc-chip__icon--leading element before the mdc-chip__checkmark element:

<div class="mdc-chip-set mdc-chip-set--filter">
  <div class="mdc-chip">
    <i class="material-icons mdc-chip__icon mdc-chip__icon--leading">face</i>
    <div class="mdc-chip__checkmark" >
      <svg class="mdc-chip__checkmark-svg" viewBox="-2 -3 30 30">
        <path class="mdc-chip__checkmark-path" fill="none" stroke="black"
              d="M1.73,12.91 8.1,19.28 22.79,4.59"/>
      </svg>
    </div>
    <div class="mdc-chip__text">Filterable content</div>
  </div>
  ...
</div>

Input Chips

Input chips are a variant of chips which enable user input by converting text into chips. To define a set of chips as input chips, add the class mdc-chip-set--input to the chip set element.

<div class="mdc-chip-set mdc-chip-set--input">
  ...
</div>

You'd also want to add an event listener that calls addChip on the MDCChipSet to convert text to a chip. More information can be found in the "MDCChip Properties and Methods" section below.

Pre-selected

To display a pre-selected filter or choice chip, add the class mdc-chip--selected to the root chip element.

<div class="mdc-chip mdc-chip--selected">
  <div class="mdc-chip__text">Add to calendar</div>
</div>

To pre-select filter chips that have a leading icon, also add the class mdc-chip__icon--leading-hidden to the mdc-chip__icon--leading element. This will ensure that the checkmark displaces the leading icon.

<div class="mdc-chip mdc-chip--selected">
  <i class="material-icons mdc-chip__icon mdc-chip__icon--leading mdc-chip__icon--leading-hidden">face</i>
  <div class="mdc-chip__checkmark">
    <svg class="mdc-chip__checkmark-svg" viewBox="-2 -3 30 30">
      <path class="mdc-chip__checkmark-path" fill="none" stroke="black"
            d="M1.73,12.91 8.1,19.28 22.79,4.59"/>
    </svg>
  </div>
  <div class="mdc-chip__text">Filterable content</div>
</div>

Style Customization

CSS Classes

CSS Class	Description
`mdc-chip-set`	Mandatory. Indicates the set that the chip belongs to.
`mdc-chip-set--input`	Optional. Indicates that the chips in the set are input chips, which enable user input by converting text into chips.
`mdc-chip-set--choice`	Optional. Indicates that the chips in the set are choice chips, which allow a single selection from a set of options.
`mdc-chip-set--filter`	Optional. Indicates that the chips in the set are filter chips, which allow multiple selection from a set of options.
`mdc-chip`	Mandatory.
`mdc-chip--selected`	Optional. Indicates that the chip is selected.
`mdc-chip__text`	Mandatory. Indicates the text content of the chip.
`mdc-chip__icon`	Optional. Indicates an icon in the chip.
`mdc-chip__icon--leading`	Optional. Indicates a leading icon in the chip.
`mdc-chip__icon--leading-hidden`	Optional. Hides the leading icon in a filter chip when the chip is selected.
`mdc-chip__icon--trailing`	Optional. Indicates a trailing icon which removes the chip from the DOM. Only use with input chips.
`mdc-chip__checkmark`	Optional. Indicates the checkmark in a filter chip.
`mdc-chip__checkmark-svg`	Mandatory with the use of `mdc-chip__checkmark`. Indicates the checkmark SVG element in a filter chip.
`mdc-chip__checkmark-path`	Mandatory with the use of `mdc-chip__checkmark`. Indicates the checkmark SVG path in a filter chip.

NOTE: Every element that has an mdc-chip__icon class must also have either the mdc-chip__icon--leading or mdc-chip__icon--trailing class.

Sass Mixins

Mixin	Description
`mdc-chip-set-spacing($gap-size)`	Customizes the amount of space between each chip in the set
`mdc-chip-corner-radius($radius)`	Customizes the corner radius for a chip
`mdc-chip-fill-color-accessible($color)`	Customizes the background fill color for a chip, and updates the chip's ink, icon and ripple colors to meet accessibility standards
`mdc-chip-fill-color($color)`	Customizes the background fill color for a chip
`mdc-chip-ink-color($color)`	Customizes the text ink color for a chip, and updates the chip's ripple color to match
`mdc-chip-selected-ink-color($color)`	Customizes text ink and ripple color of a chip in the selected state
`mdc-chip-outline($width, $style, $color)`	Customizes the outline properties for a chip
`mdc-chip-outline-width($width)`	Customizes the outline width for a chip
`mdc-chip-outline-style($style)`	Customizes the outline style for a chip
`mdc-chip-outline-color($color)`	Customizes the outline color for a chip
`mdc-chip-height($height)`	Customizes the height for a chip
`mdc-chip-leading-icon-color($color, $opacity)`	Customizes the color of a leading icon in a chip, optionally customizes opacity
`mdc-chip-trailing-icon-color($color, $opacity, $hover-opacity, $focus-opacity)`	Customizes the color of a trailing icon in a chip, optionally customizes regular/hover/focus opacities
`mdc-chip-leading-icon-size($size)`	Customizes the size of a leading icon in a chip
`mdc-chip-trailing-icon-size($size)`	Customizes the size of a trailing icon in a chip

NOTE: mdc-chip-set-spacing also sets the amount of space between a chip and the edge of the set it's contained in.

`MDCChip` and `MDCChipSet` Properties and Methods

The MDC Chips package is composed of two JavaScript classes:

MDCChip defines the behavior of a single chip.
MDCChipSet defines the behavior of chips within a specific set. For example, chips in an input chip set behave differently from those in a filter chip set.

To use the MDCChip and MDCChipSet classes, import both classes from @material/chips.

`MDCChip`

Method Signature	Description
`beginExit() => void`	Proxies to the foundation's `beginExit` method

Property	Value Type	Description
`id`	string	Unique identifier on the chip*
`selected`	Boolean	Proxies to the foundation's `isSelected`/`setSelected` methods
`shouldRemoveOnTrailingIconClick`	Boolean	Proxies to the foundation's `getShouldRemoveOnTrailingIconClick`/`setShouldRemoveOnTrailingIconClick` methods**
`ripple`	`MDCRipple`	The `MDCRipple` instance for the root element that `MDCChip` initializes

*NOTE: This will be the same as the id attribute on the root element. If an id is not provided, a unique one will be generated.

**NOTE: If shouldRemoveOnTrailingIconClick is set to false, you must manually call beginExit() on the chip to remove it.

`MDCChipSet`

Method Signature	Description
`addChip(chipEl: Element) => void`	Adds a new `MDCChip` instance to the chip set based on the given `mdc-chip` element
`getSelectedChipIds() => boolean`	Returns an array of the IDs of all selected chips

Property	Value Type	Description
`chips`	Array<`MDCChip`>	An array of the `MDCChip` objects that represent chips in the set

Usage within Web Frameworks

If you are using a JavaScript framework, such as React or Angular, you can create Chips 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: `MDCChipAdapter` and `MDCChipSetAdapter`

`MDCChipAdapter`

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
`hasClass(className: string) => boolean`	Returns true if the root element contains the given class
`addClassToLeadingIcon(className: string) => void`	Adds a class to the leading icon element
`removeClassFromLeadingIcon(className: string) => void`	Removes a class from the leading icon element
`eventTargetHasClass(target: EventTarget, className: string) => boolean`	Returns true if target has className, false otherwise
`notifyInteraction() => void`	Emits a custom event `MDCChip:interaction` denoting the chip has been interacted with*
`notifyTrailingIconInteraction() => void`	Emits a custom event `MDCChip:trailingIconInteraction` denoting the chip's trailing icon has been interacted with*
`notifyRemoval() => void`	Emits a custom event `MDCChip:removal` denoting the chip will be removed**
`getComputedStyleValue(propertyName: string) => string`	Returns the computed property value of the given style property on the root element
`setStyleProperty(propertyName: string, value: string) => void`	Sets the property value of the given style property on the root element

*NOTE: The custom events emitted by notifyInteraction and notifyTrailingIconInteraction must pass along the target chip's ID via event.detail.chipId, as well as bubble to the parent mdc-chip-set element.

**NOTE: The custom event emitted by notifyRemoval must pass along the target chip's ID via event.detail.chipId and its root element via event.detail.root, as well as bubble to the parent mdc-chip-set element.

`MDCChipSetAdapter`

Method Signature	Description
`hasClass(className: string) => boolean`	Returns whether the chip set element has the given class
`removeChip(chipId: string) => void`	Removes the chip with the given id from the chip set
`setSelected(chipId: string, selected: boolean) => void`	Sets the selected state of the chip with the given id

Foundations: `MDCChipFoundation` and `MDCChipSetFoundation`

`MDCChipFoundation`

Method Signature	Description
`isSelected() => boolean`	Returns true if the chip is selected
`setSelected(selected: boolean) => void`	Sets the chip's selected state
`getShouldRemoveOnTrailingIconClick() => boolean`	Returns whether a trailing icon click should trigger exit/removal of the chip
`setShouldRemoveOnTrailingIconClick(shouldRemove: boolean) => void`	Sets whether a trailing icon click should trigger exit/removal of the chip
`beginExit() => void`	Begins the exit animation which leads to removal of the chip
`handleInteraction(evt: Event) => void`	Handles an interaction event on the root element
`handleTransitionEnd(evt: Event) => void`	Handles a transition end event on the root element
`handleTrailingIconInteraction(evt: Event) => void`	Handles an interaction event on the trailing icon element

`MDCChipSetFoundation`

Method Signature	Description
`getSelectedChipIds() => boolean`	Returns an array of the IDs of all selected chips
`select(chipId: string) => void`	Selects the chip with the given id
`deselect(chipId: string) => void`	Deselects the chip with the given id
`toggleSelect(chipId: string) => void`	Toggles selection of the chip with the given id
`handleChipInteraction(evt: Event) => void`	Handles a custom `MDCChip:interaction` event on the root element
`handleChipRemoval(evt: Event) => void`	Handles a custom `MDCChip:removal` event on the root element

@material/chips