Safely Increment Shiny Progress Bar

A helper function that safely increments a Shiny progress bar only when the Shiny app is running and within a reactive context.

Usage

.safe_inc_progress(amount = 1)

Arguments

amount

Numeric value indicating how much to increment the progress bar by. Default is 1.

Value

No return value; called for its side effect of updating the progress bar.

Details

This function checks whether the Shiny application is running and whether there is a valid reactive domain before calling `shiny::incProgress()`. It prevents errors when the progress bar is used outside of a reactive environment or during testing/non-interactive use.

See also

[shiny::incProgress()]

Examples

if (FALSE) { # \dontrun{
withProgress(message = "Loading...", {
  for (i in 1:10) {
    safe_inc_progress(0.1)
    Sys.sleep(0.1)
  }
})
} # }