Knob Input

The JavaScript library used by this widget is no longer actively maintained.

knobInput(
  inputId,
  label,
  value,
  min = 0,
  max = 100,
  step = 1,
  angleOffset = 0,
  angleArc = 360,
  cursor = FALSE,
  thickness = NULL,
  lineCap = c("default", "round"),
  displayInput = TRUE,
  displayPrevious = FALSE,
  rotation = c("clockwise", "anticlockwise"),
  fgColor = NULL,
  inputColor = NULL,
  bgColor = NULL,
  pre = NULL,
  post = NULL,
  fontSize = NULL,
  readOnly = FALSE,
  skin = NULL,
  width = NULL,
  height = NULL,
  immediate = TRUE
)

Arguments

inputId: The input slot that will be used to access the value.
label: Display label for the control, or NULL for no label.
value: Initial value.
min: Minimum allowed value, default to 0.
max: Maximum allowed value, default to 100.
step: Specifies the interval between each selectable value, default to 1.
angleOffset: Starting angle in degrees, default to 0.
angleArc: Arc size in degrees, default to 360.
cursor: Display mode "cursor", don't work properly if width is not set in pixel, (TRUE or FALSE).
thickness: Gauge thickness, numeric value.
lineCap: Gauge stroke endings, 'default' or 'round'.
displayInput: Hide input in the middle of the knob (TRUE or FALSE).
displayPrevious: Display the previous value with transparency (TRUE or FALSE).
rotation: Direction of progression, 'clockwise' or 'anticlockwise'.
fgColor: Foreground color.
inputColor: Input value (number) color.
bgColor: Background color.
pre: A prefix string to put in front of the value.
post: A suffix string to put after the value.
fontSize: Font size, must be a valid CSS unit.
readOnly: Disable knob (TRUE or FALSE).
skin: Change Knob skin, only one option available : 'tron'.
width, height: The width and height of the input, e.g. 400px, or 100%. A value a pixel is recommended, otherwise the knob won't be able to initialize itself in some case (if hidden at start for example).
immediate: If TRUE (default), server-side value is updated each time value change, if FALSE value is updated when user release the widget.

Value

Numeric value server-side.

Examples

if (interactive()) {

library("shiny")
library("shinyWidgets")

ui <- fluidPage(
  knobInput(
    inputId = "myKnob",
    label = "Display previous:",
    value = 50,
    min = -100,
    displayPrevious = TRUE,
    fgColor = "#428BCA",
    inputColor = "#428BCA"
  ),
  verbatimTextOutput(outputId = "res")
)

server <- function(input, output, session) {

  output$res <- renderPrint(input$myKnob)

}

shinyApp(ui = ui, server = server)

}

Arguments

Value

See also

Examples