Change the value of a number input on the client

Source: R/update-input.R

Change the value of a number input on the client

updateNumericInput(
  session = getDefaultReactiveDomain(),
  inputId,
  label = NULL,
  value = NULL,
  min = NULL,
  max = NULL,
  step = NULL
)

Arguments

session

The session object passed to function given to shinyServer. Default is getDefaultReactiveDomain().
inputId

The id of the input object.
label

The label to set for the input object.
value

Initial value.
min

Minimum allowed value
max

Maximum allowed value
step

Interval to use when stepping between min and max

Details

The input updater functions send a message to the client, telling it to change the settings of an input object. The messages are collected and sent after all the observers (including outputs) have finished running.

The syntax of these functions is similar to the functions that created the inputs in the first place. For example, numericInput() and updateNumericInput() take a similar set of arguments.

Any arguments with NULL values will be ignored; they will not result in any changes to the input object on the client.

For radioButtons(), checkboxGroupInput() and selectInput(), the set of choices can be cleared by using choices=character(0). Similarly, for these inputs, the selected item can be cleared by using selected=character(0).

See also

numericInput()

Examples

## Only run examples in interactive R sessions
if (interactive()) {

ui <- fluidPage(
  sliderInput("controller", "Controller", 0, 20, 10),
  numericInput("inNumber", "Input number", 0),
  numericInput("inNumber2", "Input number 2", 0)
)

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

  observeEvent(input$controller, {
    # We'll use the input$controller variable multiple times, so save it as x
    # for convenience.
    x <- input$controller

    updateNumericInput(session, "inNumber", value = x)

    updateNumericInput(session, "inNumber2",
      label = paste("Number label ", x),
      value = x, min = x-10, max = x+10, step = 5)
  })
}

shinyApp(ui, server)
}