updateSliderInput: Change the value of a slider input on the client
In ymd526442121/Rproject_shiny: Web Application Framework for R

Description Usage Arguments Details See Also Examples

Change the value of a slider input on the client

1 2	updateSliderInput(session, inputId, label = NULL, value = NULL, min = NULL, max = NULL, step = NULL)

`session`	The `session` object passed to function given to `shinyServer`.
`inputId`	The id of the input object.
`label`	The label to set for the input object.
`value`	The value to set for the input object.
`min`	Minimum value.
`max`	Maximum value.
`step`	Step size.

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).

sliderInput

## Only run this example in interactive R sessions
if (interactive()) {
  shinyApp(
    ui = fluidPage(
      sidebarLayout(
        sidebarPanel(
          p("The first slider controls the second"),
          sliderInput("control", "Controller:", min=0, max=20, value=10,
                       step=1),
          sliderInput("receive", "Receiver:", min=0, max=20, value=10,
                       step=1)
        ),
        mainPanel()
      )
    ),
    server = function(input, output, session) {
      observe({
        val <- input$control
        # Control the value, min, max, and step.
        # Step size is 2 when input value is even; 1 when value is odd.
        updateSliderInput(session, "receive", value = val,
          min = floor(val/2), max = val+4, step = (val+1)%%2 + 1)
      })
    }
  )
}