R: Change the label or icon of an action button on the client

updateActionButton {shiny} | R Documentation

## Change the label or icon of an action button on the client

### Description

Change the label or icon of an action button on the client

### Usage

    updateActionButton(session, inputId, label = NULL, icon = 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.
`icon` | The icon to set for the input object. To remove the current icon, use `icon=character(0)`.

### 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

`actionButton`

### Examples

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

    ui <- fluidPage(
      actionButton("update", "Update other buttons"),
      br(),
      actionButton("goButton", "Go"),
      br(),
      actionButton("goButton2", "Go 2", icon = icon("area-chart")),
      br(),
      actionButton("goButton3", "Go 3")
    )

    server <- function(input, output, session) {
      observe({
        req(input$update)

        # Updates goButton's label and icon
        updateActionButton(session, "goButton",
          label = "New label",
          icon = icon("calendar"))

        # Leaves goButton2's label unchaged and
        # removes its icon
        updateActionButton(session, "goButton2",
          icon = character(0))

        # Leaves goButton3's icon, if it exists,
        # unchaged and changes its label
        updateActionButton(session, "goButton3",
          label = "New label 3")
      })
    }

    shinyApp(ui, server)
    }

[Package shiny version 1.0.3 Index]