R: Show a message

messageFuncs {shinyjs} | R Documentation

## Show a message

### Description

`alert` (and its alias `info`) shows a message to the user as a simple popup.
`logjs` writes a message to the JavaScript console. `logjs` is mainly used for debugging purposes as a way to non-intrusively print messages, but it is also visible to the user if they choose to inspect the console. You can also use the `showLog` function to print the JavaScript message directly to the R console.

### Usage

    alert(text)

    info(text)

    logjs(text)

### Arguments

`text` | The message to show. Can be either simple text or an R object.

### Note

`shinyjs` must be initialized with a call to `useShinyjs()` in the app's ui.

### See Also

`useShinyjs`, `runExample`, `showLog`

### Examples

    if (interactive()) {
      library(shiny)
      shinyApp(
        ui = fluidPage(
          useShinyjs(),  # Set up shinyjs
          actionButton("btn", "Click me")
        ),
        server = function(input, output) {
          observeEvent(input$btn, {
            # Change the following line for more examples
            alert(paste0("The date is ", date()))
          })
        }
      )
    }
    ## Not run:
      # The shinyjs function call in the above app can be replaced by
      # any of the following examples to produce similar Shiny apps
      alert("Hello!")
      alert(text = R.Version())
      logjs(R.Version())

    ## End(Not run)

[Package shinyjs version 0.9 Index]