Shiny

knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>"
)
library(whereami)

Using whereami with shiny is simple. Place cat_where(whereami()) anywhere in a shiny command and every time the rendering application hits the line it will print to console indicating which line has been hit accompanied by a counter.

── Running renderPlot(...) at shiny.R#15 (1) ───────────────────────────────────────────
── Running renderPlot(...) at shiny.R#15 (2) ───────────────────────────────────────────

Here is an example of a simple app that uses whereami in the renderPlot chunk.

# Global variables can go here
n <- 200


# Define the UI
ui <- bootstrapPage(
  numericInput('n', 'Number of obs', n),
  plotOutput('plot')
)


# Define the server code
server <- function(input, output) {
  output$plot <- renderPlot({
    cat_where(whereami())
    hist(runif(input$n))
  })
}

# Return a Shiny app object
shinyApp(ui = ui, server = server)


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whereami documentation built on Nov. 7, 2019, 5:08 p.m.