A spin button (SpinButton) allows someone to incrementally adjust a value in small steps. It’s mainly used for numeric values, but other values are supported too.

For more details and examples visit the official docs. The R package can not handle each and every case, so for advanced use cases you need to work using the original docs to achieve the desired result.

SpinButton(...)

SpinButton.shinyInput(inputId, ..., value = defaultValue)

session = shiny::getDefaultReactiveDomain(),
inputId,
...
)

## Arguments

value

string
Current value of the control.

Use this if you intend to pass in a new value as a result of change events. Mutually exclusive with defaultValue.

string
ID of a label which describes the control, if not using the default label.

ariaLabel

string
A description of the control for the benefit of screen reader users.

ariaPositionInSet

number
The position in the parent set (if in a set).

ariaSetSize

number
The total size of the parent set (if in a set).

ariaValueNow

number
Sets the control's aria-valuenow. This is the numeric form of value. Providing this only makes sense when using as a controlled component.

ariaValueText

string

className

string
Custom className for the control.

componentRef

IRefObject<ISpinButton>
Gets the component ref.

decrementButtonAriaLabel

string
Accessible label text for the decrement button (for screen reader users).

decrementButtonIcon

IIconProps
Custom props for the decrement button.

defaultValue

string
Initial value of the control. Updates to this prop will not be respected.

Use this if you intend for the SpinButton to be an uncontrolled component which maintains its own value. Mutually exclusive with value.

disabled

boolean
Whether or not the control is disabled.

downArrowButtonStyles

Partial<IButtonStyles>
Custom styles for the down arrow button.

Note: The buttons are in a checked state when arrow keys are used to incremenent/decrement the SpinButton. Use rootChecked instead of rootPressed for styling when that is the case.

getClassNames

(theme: ITheme, disabled: boolean, isFocused: boolean, keyboardSpinDirection: KeyboardSpinDirection, labelPosition?: Position, className?: string) => ISpinButtonClassNames
Custom function for providing the classNames for the control. Can be used to provide all styles for the component instead of applying them on top of the default styles.

iconButtonProps

IButtonProps
Additional props for the up and down arrow buttons.

iconProps

IIconProps
Props for an icon to display alongside the control's label.

incrementButtonAriaLabel

string
Accessible label text for the increment button (for screen reader users).

incrementButtonIcon

IIconProps
Custom props for the increment button.

inputProps

React.InputHTMLAttributes<HTMLElement | HTMLInputElement>
Additional props for the input field.

keytipProps

IKeytipProps
Keytip for the control.

label

string
Descriptive label for the control.

labelPosition

Position
Where to position the control's label.

max

number
Max value of the control.

min

number
Min value of the control.

onBlur

React.FocusEventHandler<HTMLInputElement>
Callback for when the control loses focus.

onDecrement

(value: string, event?: React.MouseEvent<HTMLElement> | React.KeyboardEvent<HTMLElement>) => string | void
Callback for when the decrement button or down arrow key is pressed.

onFocus

React.FocusEventHandler<HTMLInputElement>
Callback for when the user focuses the control.

onIncrement

(value: string, event?: React.MouseEvent<HTMLElement> | React.KeyboardEvent<HTMLElement>) => string | void
Callback for when the increment button or up arrow key is pressed.

onValidate

(value: string, event?: React.SyntheticEvent<HTMLElement>) => string | void
Callback for when the entered value should be validated.

precision

number
How many decimal places the value should be rounded to.

The default is calculated based on the precision of step: i.e. if step = 1, precision = 0. step = 0.0089, precision = 4. step = 300, precision = 2. step = 23.00, precision = 2.

step

number
Difference between two adjacent values of the control. This value is used to calculate the precision of the input if no precision is given. The precision calculated this way will always be \>= 0.

styles

Partial<ISpinButtonStyles>
Custom styling for individual elements within the control.

theme

ITheme
Theme provided by HOC.

title

string
A more descriptive title for the control, visible on its tooltip.

upArrowButtonStyles

Partial<IButtonStyles>
Custom styles for the up arrow button.

Note: The buttons are in a checked state when arrow keys are used to incremenent/decrement the SpinButton. Use rootChecked instead of rootPressed for styling when that is the case.

## Best practices

### Layout

• Use a spin button when you need to incrementally change a value.

• Use a spin button when values are tied to a unit of measure.

• Don't use a spin button for binary settings.

• Don't use a spin button for a range of three values or less.

• Place labels to the left of the spin button control. For example, "Length of ruler (cm)".

• Spin button width should adjust to fit the number values.

### Content

• Include a label indicating what value the spin button changes.

## Examples

library(shiny.fluent)

if (interactive()) {
shinyApp(
ui = div(
SpinButton.shinyInput("spin", value = 15, min = 0, max = 50, step = 5),
textOutput("spinValue")
),
server = function(input, output) {
output$spinValue <- renderText({ sprintf("Value: %s", input$spin)
})
}
)
}