I've been working with interactive mapping within R for a while now and most of my experience lies in Leaflet (mostly the R package, but also a bit in Javascript). I just recently delved into mapview as an alternative and have a quick question about enabling the hover popup windows.

As you can see in this example with polygons, when you move your mouse over each polygon, a small popup window appears with each feature ID. The vector data description states:

in case you have the latest version of leaflet installed the map will also have a scale bar in the bottom left corner and provide labels of feature IDs if you hover over the features.

I have both Leaflet and Leaflet for R updated on my computer, yet this hover feature is not activated. The scale bar is also not shown. I used the mapview example of gadmCHE, as you'll see in the image below:

enter image description here

Does anyone know if this "latest version of leaflet" refers to leaflet.js or the R package leaflet? I just downloaded Leaflet 1.0.0-rc3 here and also made sure that I updated the leaflet package, so I'm not sure where to go from here to enable that hover/scalebar feature.

1 Answer 1


I think you need to install the latest version of leaflet (R package). Try:


Update 1:

Try installing the development version of mapview

devtools::install_github("environmentalinformatics-marburg/mapview", ref = "develop")

That worked for me.


  • yes! Loading in the development version yielded the results I wanted. Hover windows are now in working order. :) Thanks!
    – Lauren
    Commented Oct 6, 2016 at 20:30

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