runcode {shinyjs} | R Documentation

## Construct to let you run arbitrary R code live in a Shiny app

### Description

Sometimes when developing a Shiny app, it's useful to be able to run some R code on-demand. This construct provides your app with a text input where you can enter any R code and run it immediately.
This can be useful for testing and while developing an app locally, but it should not be included in an app that is accessible to other people, as letting others run arbitrary R code can open you up to security attacks.
To use this construct, you must add a call to `runcodeUI()` in the UI of your app, and a call to `runcodeServer()` in the server function. You also need to initialize shinyjs with a call to `useShinyjs()` in the UI.

### Usage

    runcodeUI(code = "", type = c("text", "textarea"), width = NULL,
      height = NULL, includeShinyjs = FALSE)

    runcodeServer()

### Arguments

`code` | The initial R code to show in the text input when the app loads
`type` | One of `"text"` (default) or `"textarea"`. When using a text input, the R code will be limited to be typed within a single line, and is the recommended option. Textarea should be used if you want to write long multi-line R code. Note that you can run multiple expressions even in a single line by appending each R expression with a semicolon.
`width` | The width of the text or textarea input
`height` | The height of the textarea input (only applicable when `type="textarea"`)
`includeShinyjs` | Set this to `TRUE` only if your app does not have a call to `useShinyjs()`. If you are already calling `useShinyjs()` in your app, do not use this parameter.

### Note

You can only have one `runcode` construct in your shiny app. Calling this function multiple times within the same app will result in unpredictable behaviour.

### See Also

`useShinyjs`

### Examples

    if (interactive()) {
      library(shiny)

      shinyApp(
        ui = fluidPage(
          useShinyjs(),  # Set up shinyjs
          runcodeUI(code = "shinyjs::alert('Hello!')")
        ),
        server = function(input, output) {
          runcodeServer()
        }
      )
    }

[Package shinyjs version 0.8 Index]