update_action_button: Change the label or icon of an action button on the client
In shiny.semantic: Semantic UI Support for Shiny

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

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update_action_button(session, input_id, label = NULL, icon = NULL)

updateActionButton(session, inputId, label = NULL, icon = NULL)

`session`	The session object passed to function given to shinyServer.
`input_id`	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)
`inputId`	the same as `input_id`

if (interactive()){
library(shiny)
library(shiny.semantic)

ui <- semanticPage(
  actionButton("update", "Update button"),
  br(),
  actionButton("go_button", "Go")
)

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

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

  })
}
shinyApp(ui, server)
}