Class “Button”

Object > NativeObject > Widget > Button

A push button. Can contain a text or an image.

Button on Android
Android
Button on iOS
iOS
Type: Button extends Widget
Constructor: public
Singleton: No
Namespace: tabris
Direct subclasses: None
JSX Support: Element: <Button/>
Parent Elements: <Canvas/>, <Cell/>, <Composite/>, <Page/>, <RefreshComposite/>, <Row/>, <ScrollView/>, <Stack/>, <Tab/>
Child Elements: Not Supported
Element content sets: text

Examples

JavaScript

import {Button, contentView} from 'tabris';

new Button({text: 'Save'})
  .onSelect(() => console.log('Button tapped'))
  .appendTo(contentView);

See also:

JSX Create a simple Button
JSX Create buttons with different styles

Constructor

new Button(properties?)

Parameter Type Description
properties Properties<Button> Sets all key-value pairs in the properties object as widget properties. Optional.

Properties

alignment

The horizontal alignment of the button text.

Type: 'left' | 'right' | 'centerX'
Default: 'centerX'
Settable: Yes
Change Event: alignmentChanged

autoCapitalize

Control how the button text is capitalized.

  • 'default' - The platform decides on the capitalization
  • 'none' - The text is displayed unaltered
  • 'all' - Every letter is capitalized
Type: 'default'
| 'none'
| 'all'
Default: 'default'
Settable: Yes
Change Event: autoCapitalizeChanged

font

The font used for the button text.

Type: FontValue
Settable: Yes
Change Event: fontChanged

image

An image to be displayed on the button.

Type: ImageValue
Settable: Yes
Change Event: imageChanged

imageTintColor

A color to change the image appearance. All opaque parts of the image will be tinted with the given color. Set to initial to remove the effect.

Type: ColorValue
Settable: Yes
Change Event: imageTintColorChanged

strokeColor

Controls the line width of a button with the style outline.

Type: ColorValue
Settable: Yes
Change Event: strokeColorChanged

strokeWidth

Controls the line color of a button with the style outline. Uses a platform-specific default if set to null.

Type: number | null
Default: null
Settable: Yes
Change Event: strokeWidthChanged

style

The style controls the appearance of a Button and has to be provided in its constructor. The default style creates a platform specific button, which is flat on iOS and has an elevation and shadow on Android. In addition the following specific style values can be used:

  • elevate A button with a platform specific background color, elevation and a surrounding drop shadow. Only supported on Android
  • flat A button with no elevation and a platform specific background color
  • outline A button with a transparent background and an outline stroke which can be controlled via the properties strokeWidth and strokeColor
  • text A button with no background and only consisting of its text label.
Type: 'default' | 'elevate' | 'flat' | 'outline' | 'text'
Default: 'default'
Settable: By Constructor or JSX
Change Event: Not supported

This property can only be set via constructor or JSX. Once set, it cannot change anymore.

See also:

JSX button-style.jsx

text

The button’s label text.

Type: string
Settable: Yes
Change Event: textChanged
JSX Content Type: Text

When using Button as an JSX element the elements Text content is mapped to this property.

textColor

The color of the text.

Type: ColorValue
Settable: Yes
Change Event: textColorChanged

Events

select

Fired when the button is pressed.

EventObject Type: EventObject<Button>

This event has no additional parameter.

Change Events

strokeColorChanged

Fired when the strokeColor property has changed.

EventObject Type: PropertyChangedEvent<Button, ColorValue>

Property Type Description
value ColorValue The new value of strokeColor.

strokeWidthChanged

Fired when the strokeWidth property has changed.

EventObject Type: PropertyChangedEvent<Button, number | null>

Property Type Description
value number | null The new value of strokeWidth.

alignmentChanged

Fired when the alignment property has changed.

EventObject Type: PropertyChangedEvent<Button, string>

Property Type Description
value string The new value of alignment.

fontChanged

Fired when the font property has changed.

EventObject Type: PropertyChangedEvent<Button, FontValue>

Property Type Description
value FontValue The new value of font.

imageChanged

Fired when the image property has changed.

EventObject Type: PropertyChangedEvent<Button, ImageValue>

Property Type Description
value ImageValue The new value of image.

imageTintColorChanged

Fired when the imageTintColor property has changed.

EventObject Type: PropertyChangedEvent<Button, ColorValue>

Property Type Description
value ColorValue The new value of imageTintColor.

textChanged

Fired when the text property has changed.

EventObject Type: PropertyChangedEvent<Button, string>

Property Type Description
value string The new value of text.

textColorChanged

Fired when the textColor property has changed.

EventObject Type: PropertyChangedEvent<Button, ColorValue>

Property Type Description
value ColorValue The new value of textColor.

autoCapitalizeChanged

Fired when the autoCapitalize property has changed.

EventObject Type: PropertyChangedEvent<Button, 'default' | 'none' | 'all'>

Property Type Description
value 'default'
| 'none'
| 'all'
The new value of autoCapitalize.