MDUIDocsEnglish简体中文LightDarkSystem
Preset Colors
Custom Color
Extract Color from Wallpaper
Select a Wallpaper
Getting Started
Styles
Frameworks
Components
Avatar Badge BottomAppBar Button ButtonIcon Card Checkbox Chip CircularProgress Collapse Dialog Divider Dropdown Fab Icon Layout LinearProgress List Menu NavigationBar NavigationDrawer NavigationRail Radio RangeSlider Select SegmentedButton Slider Snackbar Switch Tabs TextField Tooltip TopAppBar
Functions
Libraries

Fab

The Floating Action Button (FAB) is a primary component for key actions, offering easy access.

Usage

Import the component:

import 'mdui/components/fab.js';

Import the TypeScript type:

import type { Fab } from 'mdui/components/fab.js';

Example:

<mdui-fab icon="edit"></mdui-fab>

Examples

Icon

Set the Material Icon name with the icon attribute or use the icon slot.

Extended State

Use extended to display text from the default slot in the extended state.

Shape

Set the FAB shape with the variant attribute.

Size

Set the FAB size with the size attribute.

Use the href attribute to turn the FAB into a link. The download, target, and rel attributes are available for link-related functionality.

Disabled and Loading State

Use disabled to disable the FAB. Use loading to add a loading state.

API

Properties

AttributePropertyReflectTypeDefault
variantvariant'primary' | 'surface' | 'secondary' | 'tertiary''primary'

Sets the FAB color. Possible values:

  • primary: Uses the primary container background color.
  • surface: Uses the surface container high background color.
  • secondary: Uses the secondary container background color.
  • tertiary: Uses the tertiary container background color.
sizesize'normal' | 'small' | 'large''normal'

Sets the FAB size. Possible values:

  • normal: Sets the FAB to a normal size.
  • small: Sets the FAB to a small size.
  • large: Sets the FAB to a large size.
iconiconstring-

Sets the Material Icons name. Alternatively, use slot="icon".

extendedextendedbooleanfalse

Indicates if the FAB is in the extended state.

hrefhrefstring-

The URL for the hyperlink. If provided, the component is rendered as an <a> element and can use link-related attributes.

downloaddownloadstring-

Instructs the browser to download the linked URL.

Note: This is only available when href is specified.

targettarget'_blank' | '_parent' | '_self' | '_top'-

Defines where to open the linked URL. Possible values:

  • _blank: Opens in a new tab or window.
  • _parent: Opens in the parent browsing context or _self if no parent.
  • _self: Opens in the current browsing context. (Default).
  • _top: Opens in the topmost browsing context or _self if no ancestors.

Note: This is only available when href is specified.

relrel'alternate' | 'author' | 'bookmark' | 'external' | 'help' | 'license' | 'me' | 'next' | 'nofollow' | 'noreferrer' | 'opener' | 'prev' | 'search' | 'tag'-

Specifies the relationship of the linked URL as space-separated link types. Possible values:

  • alternate: Alternate versions of the current document.
  • author: The author of the current document or article.
  • bookmark: The permalink for the nearest ancestor section.
  • external: The referenced document is not part of the same site as the current document.
  • help: A link to context-sensitive help.
  • license: Indicates that the main content of the current document is covered by the copyright license described by the referenced document.
  • me: Indicates that the current document represents the person who owns the linked content.
  • next: Indicates that the current document is part of a series and the next document in the series is the referenced document.
  • nofollow: Indicates that the current document's original author or publisher does not endorse the referenced document.
  • noreferrer: No Referer header will be included. Also has the same effect as noopener.
  • opener: Creates an auxiliary browsing context if the hyperlink would otherwise create a top-level browsing context that is not an auxiliary browsing context (i.e., has "_blank" as target attribute value).
  • prev: Indicates that the current document is part of a series and the previous document in the series is the referenced document.
  • search: Links to a resource that can be used to search through the current document and its related pages.
  • tag: Gives a tag (identified by the given address) that applies to the current document.

Note: This is only available when href is specified.

autofocusautofocusbooleanfalse

Specifies that the element should be focused when the page loads.

tabindextabIndexnumber-

Defines the order in which the element receives focus when navigating with the Tab key.

disableddisabledbooleanfalse

Disables the element.

loadingloadingbooleanfalse

Indicates that the element is in a loading state.

namenamestring''

The button's name, which is submitted with form data.

Note: This is only available when href is not specified.

valuevaluestring''

The button's value, which is submitted with form data.

Note: This is only available when href is not specified.

typetype'submit' | 'reset' | 'button''button'

Defines the button's default behavior. The default is button. Possible values:

  • submit: Submits the form data to the server.
  • reset: Resets all the controls to their initial values.
  • button: No default behavior, does nothing when pressed by default.

Note: This is only available when href is not specified.

formformstring-

Associates the button with a <form> element. The value should be the id of a <form> in the same document. If not set, the button is associated with its parent <form>, if any.

This attribute allows button elements to be associated with <form>s anywhere in the document, not just inside a <form>.

Note: Only available when href is not specified.

formactionformActionstring-

Specifies the URL that processes the button's submitted information. Overrides the action attribute of the button's form owner.

Note: Only available when href is not specified and type="submit".

formenctypeformEnctype'application/x-www-form-urlencoded' | 'multipart/form-data' | 'text/plain'-

Specifies the form data encoding method. Possible values:

  • application/x-www-form-urlencoded: Default if the attribute is not used.
  • multipart/form-data: Used for <input> elements with type set to file.
  • text/plain: For debugging, not for real form submission.

Overrides the enctype attribute of the button's form owner.

Note: Only available when href is not specified and type="submit".

formmethodformMethod'post' | 'get'-

Specifies the HTTP method for form submission. Possible values:

  • post: Form data included in HTTP request body.
  • get: Form data appended to action URL.

Overrides the method attribute of the button's form owner.

Note: Only available when href is not specified and type="submit".

formnovalidateformNoValidatebooleanfalse

Specifies that the form should not be validated on submission. Overrides the novalidate attribute of the button's form owner.

Note: Only available when href is not specified and type="submit".

formtargetformTarget'_self' | '_blank' | '_parent' | '_top'-

Specifies where to display the form submission response. Possible values:

  • _self: Current browsing context. (Default).
  • _blank: New tab or window.
  • _parent: Parent browsing context or _self if no parent.
  • _top: Topmost browsing context or _self if no ancestors.

Overrides the target attribute of the button's form owner.

Note: Only available when href is not specified and type="submit".

validityValidityState-

A ValidityState object that represents the element's validity states.

validationMessagestring-

The element's validation message. This is empty if the element meets its constraints.

Methods

NameParametersReturns
click
void

Simulates a mouse click on the element.

focus
  • options: FocusOptions (Optional)
void

Sets focus on the element. An optional parameter can be an object with a preventScroll property. If preventScroll is set to true, the page will not scroll to bring the focused element into view.

blur
void

Removes focus from the element.

checkValidity
boolean

Checks the validity of the form field. If it's invalid, it triggers an invalid event and returns false. If it's valid, it returns true.

reportValidity
boolean

Checks the validity of the form field. If it's invalid, it triggers an invalid event, returns false, and displays a validation message. If it's valid, it returns true.

setCustomValidity
  • message: string
void

Sets a custom error message. If the text is non-empty, it indicates that the field is invalid.

Events

Name
focus

Emitted when the FAB gains focus.

blur

Emitted when the FAB loses focus.

invalid

Emitted when the form control's validity is checked and it doesn't meet the constraints.

Slots

Name
(default)

Text content.

icon

Icon.

CSS Parts

Name
button

Internal <button> or <a> element.

label

Text on the right side.

icon

Icon on the left side.

loading

The <mdui-circular-progress> element for the loading state.

CSS Custom Properties

Name
--shape-corner-small

The size of the component corner when size="small". You can use a specific pixel value, but it's recommended to reference design tokens.

--shape-corner-normal

The size of the component corner when size="normal". You can use a specific pixel value, but it's recommended to reference design tokens.

--shape-corner-large

The size of the component corner when size="large". You can use a specific pixel value, but it's recommended to reference design tokens.

On this page