Getting URL parameters in a shiny dashboard app

Has anyone been successful in using URL parameters in a shiny dashboard app? I've experimented with the many posts and documentation for using the session$clientData$url_search string. I can get several simple examples to work but have not been able to access the url_search string from within the dashboard environment.


Could you please provide us with a comprehensive example using the post below to let us reproduce the issue and see where you get stuck:



In coming up with a simple example I managed to get this to work. Here's the example in case anyone else has the same trouble.



ui <- dashboardPage(
  dashboardHeader(title="Query Parameters"),
    h3("URL components"),
    h3("Parsed query string"),

server <- function(input, output, session) {
  # Return the components of the URL in a string:
  output$urlText <- renderText({
    paste(sep = "",
          "protocol: ", session$clientData$url_protocol, "\n",
          "hostname: ", session$clientData$url_hostname, "\n",
          "pathname: ", session$clientData$url_pathname, "\n",
          "port: ",     session$clientData$url_port,     "\n",
          "search: ",   session$clientData$url_search,   "\n"
  # Parse the GET query string
  output$queryText <- renderText({
    query <- parseQueryString(session$clientData$url_search)
    # Return a string with key-value pairs
    paste(names(query), query, sep = "=", collapse=", ")

shinyApp(ui, server)

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