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README.md

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

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.

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.

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>

Adding Chips to the DOM

The MDC Chips package does not handle the process of converting text into chips, in order to remain framework-agnostic. The MDCChipSet component exposes an addChip method, which accepts an element which is expected to already be inserted within the Chip Set element after any existing chips. The MDCChipSet component will then handle creating and tracking a MDCChip component instance.

For example:

input.addEventListener('keydown', function(event) {
  if (event.key === 'Enter' || event.keyCode === 13) {
    const chipEl = document.createElement('div');
    // ... perform operations to properly populate/decorate chip element ...
    chipSetEl.appendChild(chipEl);
    chipSet.addChip(chipEl);
  }
});

NOTE: MDCChipSet will generate a unique ID to apply to each added chip's element if it does not already have an ID when it is passed to addChip. This is used to distinguish chips during user interactions.

Removing Chips from the DOM

By default, input chips are removed in response to clicking the trailing remove icon in the chip. Removal can also be triggered by calling MDCChip's beginExit() method.

Individual MDCChip instances will emit a MDCChip:removal event once the exit transition ends. MDCChipSet will handle destroying the MDCChip instance in response to MDCChip:removal, but it must be removed from the DOM manually. You can listen for MDCChip:removal from the parent Chip Set or any ancestor, since the event bubbles:

chipSet.listen('MDCChip:removal', function(event) {
  chipSetEl.removeChild(event.root);
});

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. We recommend using Material Icons from Google Fonts.
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($gap-size) Customizes the amount of space between each chip in the set
mdc-chip-shape-radius($radius, $rtl-reflexive) Sets the rounded shape to chip with given radius size. Set $rtl-reflexive to true to flip radius values in RTL context, defaults to false.
mdc-chip-fill-color-accessible($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, $horizontal-padding) Customizes the outline width for a chip. $horizontal-padding is only required in cases where mdc-chip-horizontal-padding is also included with a custom value
mdc-chip-outline-style($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-horizontal-padding($padding) Customizes the horizontal padding for a chip
mdc-chip-leading-icon-color($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($size) Customizes the size of a trailing icon in a chip
mdc-chip-leading-icon-margin($top, $right, $bottom, $left) Customizes the margin of a leading icon in a chip
mdc-chip-trailing-icon-margin($top, $right, $bottom, $left) Customizes the margin of a trailing icon in a chip
mdc-chip-elevation-transition() Adds a MDC elevation transition to the chip. This should be used instead of setting transition with mdc-elevation-transition-value() directly when a box shadow transition is desired for 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.

Events
Event Name event.detail Description
MDCChip:interaction {chipId: string} Indicates the chip was interacted with (via click/tap or Enter key)
MDCChip:selection {chipId: string, selected: boolean} Indicates the chip's selection state has changed (for choice/filter chips)
MDCChip:removal {chipId: string, root: Element} Indicates the chip is ready to be removed from the DOM
MDCChip:trailingIconInteraction {chipId: string} Indicates the chip's trailing icon was interacted with (via click/tap or Enter key)

NOTE: All of MDCChip's emitted events bubble up through the DOM.

MDCChipSet

Method Signature Description
addChip(chipEl: Element) => void Adds a new MDCChip instance to the chip set based on the given mdc-chip element
Property Value Type Description
chips Array<MDCChip> An array of the MDCChip objects that represent chips in the set
selectedChipIds !Array<string> (read-only) An array of the IDs of all selected chips

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

See chip/index.js and chip-set/index.js for vanilla DOM implementations of these adapter APIs for reference.

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 Notifies the Chip Set that the chip has been interacted with*
notifySelection(selected) => void Notifies the Chip Set that the chip has been selected or deselected**
notifyTrailingIconInteraction() => void Notifies the Chip Set that the chip's trailing icon has been interacted with*
notifyRemoval() => void Notifies the Chip Set that 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: notifyInteraction and notifyTrailingIconInteraction must pass along the target chip's ID, and must be observable by the parent mdc-chip-set element (e.g. via DOM event bubbling).

**NOTE: notifySelection must pass along the target chip's ID and selected state, and must be observable by the parent mdc-chip-set element (e.g. via DOM event bubbling).

***NOTE: notifyRemoval must pass along the target chip's ID and its root element, and must be observable by the parent mdc-chip-set element (e.g. via DOM event bubbling).

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

MDCChipFoundation Event Handlers

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

Events Element Selector Foundation Handler
click, keydown .mdc-chip (root) handleInteraction()
click, keydown .mdc-chip__icon--trailing (if present) handleTrailingIconInteraction()
transitionend .mdc-chip (root) handleTransitionEnd()

MDCChipSetFoundation

Method Signature Description
getSelectedChipIds() => !Array<string> Returns an array of the IDs of all selected chips
select(chipId: string) => void Selects the chip with the given id
handleChipInteraction(chipId: string) => void Handles a custom MDCChip:interaction event on the root element
handleChipSelection(chipId: string, selected: boolean) => void Handles a custom MDCChip:selection event on the root element
handleChipRemoval(chipId: string) => void Handles a custom MDCChip:removal event on the root element

MDCChipSetFoundation Event Handlers

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

Events Element Selector Foundation Handler
MDCChip:interaction .mdc-chip-set (root) handleChipInteraction
MDCChip:selection .mdc-chip-set (root) handleChipSelection
MDCChip:removal .mdc-chip-set (root) handleChipRemoval