Shiny by RStudio

Change the value of a slider input on the client

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

Arguments

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.

Description

Change the value of a slider input on the client

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).

Examples

## 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) }) } ) }

See also

sliderInput