Mapview no longer renders in Shiny

[Bevan]

I have an app thta includes an interactive mapping window using renderMapview. The app used to function jsut fine, but within the last week I have started receiving the following error:
"Warning: Error in exprToQuo: Don't know how to convert 'leaflet' to a function; a quosure or quoted expression was expected
55: stop
54: exprToQuo
53: exprToFunction
52: shiny::installExprFunction
51: htmlwidgets::shinyRenderWidget
50: renderMapview
49: server [#63]
Error in exprToQuo(expr, env, quoted = TRUE) :
Don't know how to convert 'leaflet' to a function; a quosure or quoted expression was expected"

It seems as though it is on the shiny side as I can still run the mapview component in an r session and they render just fine.

[nirgrahamuk]

Hi, welcome!

To help us help you, could you please prepare a reproducible example (reprex) illustrating your issue? Please have a look at these resources, to see how to create one for a shiny app

Chapter 5 Workflow | Mastering Shiny

Shiny debugging and reprex guide

Shiny issues can be challenging to resolve relative to other problems with your code or statistical methods. Shiny apps are often large, complex projects with interacting files. When seeking help from others it is considered polite to: First, do your best to work through RStudio's debugging tools to diagnose your issue on your own. Often those shiny logs and tracebacks are useful to others trying to help out. Second, strive to minimize the effort required to replicate your issue. You can do this with a reproducible example ("reprex"). Shiny Debugging Errors in Shiny code can be difficult to track down. If you don't know where your problem is coming from, you can track it down with some o…

[williaml]

I came across your error as well. Not sure how to fix it, though I would just use leaflet instead.

library(shiny)
library(shinydashboard)
library(mapview)

ui <- dashboardPage(
  dashboardHeader(title = "test"),
  dashboardSidebar(),
  dashboardBody(
    mapviewOutput("map")
  )
)

server <- function(input, output) {
  output$map <- renderMapview({
    mapview(breweries)
  })
}

shinyApp(ui, server)

Warning: Error in exprToQuo: Don't know how to convert 'leaflet' to a function; a quosure or quoted expression was expected
55: stop
54: exprToQuo
53: exprToFunction
52: shiny::installExprFunction
51: htmlwidgets::shinyRenderWidget
50: renderMapview
49: server [#2]
Error in exprToQuo(expr, env, quoted = TRUE) :
Don't know how to convert 'leaflet' to a function; a quosure or quoted expression was expected

[nirgrahamuk]

The reprex worked for me to show a map, I'm using R version 4.0.5, shiny 1.6 and mapview 2.10

[williaml]

It doesn't work for me on:

> sessionInfo()
R version 4.1.1 (2021-08-10)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19043)

Matrix products: default

locale:
[1] LC_COLLATE=English_Australia.1252  LC_CTYPE=English_Australia.1252    LC_MONETARY=English_Australia.1252 LC_NUMERIC=C                      
[5] LC_TIME=English_Australia.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] mapview_2.10.0       shinydashboard_0.7.2 shiny_1.7.0   

[fiorepalombina]

I am facing the same issue.

I have update all the package and now i am getting the same error.

[williaml]

I've raised a github issue:

Not rendering in shiny.

[williaml]

Here is the response:

Yes, please use leafletOutput() and renderLeaflet() directly on the @map slot of the mapview map, i.e.

output$map<-renderLeaflet({
    mapview(franconia)@map
    # or 
    mapview::mapview2leaflet(mapview(franconia))
  })

Mapview - New version of shiny issue

[Bevan]

Thanks for the info, glad to see it was not me missing something simple.