Run a startup version check and return a banner UI element

Call this outside server() – typically in global.R or at the top of app.R – and embed the returned value directly in your UI definition. Because the check runs at startup the banner is present on first render with no loading delay, and no uiOutput() / renderUI() wiring is needed.

Usage

check_app_version(
  github_user,
  github_repo,
  app_version = NULL,
  verbose = FALSE
)

Arguments

github_user:

GitHub username or organisation that owns the repository.
github_repo:

Repository name. Also used as the package name for utils::packageVersion().
app_version:

Optional fallback version string for environments where the package is not installed (e.g. shinyapps.io). Pass the result of your app_version() function here. Ignored when packageVersion() succeeds.
verbose:

Logical; if TRUE a banner is always returned. Defaults to FALSE.

Value

A shinyWidgets::alert() UI element, or NULL when there is nothing to show (up to date in non-verbose mode).

Details

Normal mode (verbose = FALSE): returns a banner only when a newer version is available or when the check fails. Returns NULL when the app is up to date (Shiny silently ignores NULL in the UI).

Verbose / debug mode (verbose = TRUE): always returns a banner – including a success banner when up to date – so you can confirm the check ran and inspect both version strings during development.

Examples

if (FALSE) { # \dontrun{
# global.R or top of app.R
source("version_check.R")
version_banner <- check_app_version(
  github_user = "my-org",
  github_repo = "my-shiny-app",
  app_version = app_version()   # fallback for shinyapps.io
)

# ui.R
fluidPage(
  version_banner,
  # ... rest of UI
)

# Verbose mode for development
version_banner <- check_app_version(
  github_user = "my-org",
  github_repo = "my-shiny-app",
  app_version = app_version(),
  verbose     = TRUE
)
} # }

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