Now it's a real data frame!

R/frappeChart.R

 updateFrappeChart <- function(inputId, data, session = shiny::getDefaultReactiveDomain()) {
   session$sendCustomMessage("frappeCharts:update", list(id = inputId, data = data))
 }
+
+.onLoad <- function(libname, pkgname) {
+  shiny::registerInputHandler(
+    type = "frappeCharts-selected",
+    fun = function(value, session, inputName) {
+      as.data.frame(value, stringsAsFactors = FALSE)
+    }
+  )
+}

dev/dev.Rmd

     })
     }
     ```
+
+1. But now in Shiny it needs to go from a list to a data.frame.
+   To do this we use `shiny::registerInputHandler()` in R and
+   give the input event a type: `inputId_selected:frappeCharts-selected`.
+   
+   ```r
+   .onLoad <- function(libname, pkgname) {
+      shiny::registerInputHandler(
+        type = "frappeCharts-selected",
+        fun = function(value, session, inputName) {
+          as.data.frame(value, stringsAsFactors = FALSE)
+        }
+      )
+    }
+   ```

inst/htmlwidgets/frappeChart.js

               return acc
             }, {})
             data[labelsName] = label
-            Shiny.setInputValue(el.id + '_selected', data)
+            Shiny.setInputValue(el.id + '_selected:frappeCharts-selected', data)
           })
         }
       },