Change the value of a textarea input on the client
Change the value of a textarea input on the client
updateTextAreaInput( session = getDefaultReactiveDomain(), inputId, label = NULL, value = NULL, placeholder = NULL )
session |
The |
inputId |
The id of the input object. |
label |
The label to set for the input object. |
value |
Initial value. |
placeholder |
A character string giving the user a hint as to what can be entered into the control. Internet Explorer 8 and 9 do not support this option. |
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).
## Only run examples in interactive R sessions
if (interactive()) {
ui <- fluidPage(
sliderInput("controller", "Controller", 0, 20, 10),
textAreaInput("inText", "Input textarea"),
textAreaInput("inText2", "Input textarea 2")
)
server <- function(input, output, session) {
observe({
# We'll use the input$controller variable multiple times, so save it as x
# for convenience.
x <- input$controller
# This will change the value of input$inText, based on x
updateTextAreaInput(session, "inText", value = paste("New text", x))
# Can also set the label, this time for input$inText2
updateTextAreaInput(session, "inText2",
label = paste("New label", x),
value = paste("New text", x))
})
}
shinyApp(ui, server)
}Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.