Is it possible to make a Rmarkdown file reactive to a shiny app??

[Margarita Garfias]

Hi!

I have a dynamic app (similar to this one ) in which I have some cities mapped out, and when the user clicks on a specific city, the app gives them information about it. All the info comes out of a data frame and everything works fine in the app. The thing is, I want the users to be able to download a PDF file specific to the city they clicked on. I have a .Rmd file prepared (as all the PDF's would have the same type of information, except it should be specific to the city, aka density, financial independece, etc.) but I can't find a way to link it to the shiny app, as in make the PDF display the name of the city and all of its specific information. I am able to download a "standard" PDF from the app--non reactive--, but I don't know if it is possible to make it reactive to the shiny app without having to make a specific file for each city?

The code I am using to download the pdf is this (and works fine):

output$downloadpdf <- downloadHandler(

    

    filename= "Report.pdf",

    

    content = function(file) {

      out = rmarkdown::render("Report.Rmd")

      file.rename(out, file)

    },

    

    contentType = 'application/pdf'

  )

  

And if I type this in my .Rmd to display the name of the chosen city (which is the same code I have in my server.R to display the name of the city):

```{r}

 output$zona.metropolitana.name 

 

 ````

when I try downloading the PDF, it only renders this in a blank page: 

"Reading objects from shinyoutput object not allowed rmarkdown"

So, again, is there a way to  make my .Rmd (PDF) file reactive to my shiny app??

Thank you for your help!
Margarita

[Joe Cheng]

Maybe try this:

    content = function(file) {

      inputEnv <- new.env()

      inputEnv$city <- input$city  # or whatever

      inputEnv$cityData <- cityData()

      out = rmarkdown::render("Report.Rmd", envir = inputEnv)

      file.rename(out, file)

    },

Then in your Rmd document you should be able to refer to city/cityData and get the values that you assigned to inputEnv.

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