listviewer

A package of R htmlwidgets to interactively view and maybe modify lists. As of now, listviewer provides an interface to jsoneditor and react-json-view. listviewer is designed to support multiple interfaces.

install

CRAN

install.packages("listviewer")

Development Version

devtools::install_github("timelyportfolio/listviewer")

jsoneditor

jsoneditor is a really well designed JSON interactive editor by Jos de Jong. Since most R data can be represented in JSON, we can use this great JavaScript library in R.

# using the data from the jsoneditor simple example
#  in R list form

library(listviewer)

jsonedit(
  list(
    array = c(1,2,3)
    ,boolean = TRUE
    ,null = NULL
    ,number = 123
    ,object = list( a="b", c="d" )
    ,string = "Hello World"
  )
)

# also works with data.frames
jsonedit( mtcars )

# helpful interactive view of par
jsonedit( par() )

# meta view of the above
jsonedit(jsonedit(par()))

See the above interactive view of par for yourself.

I got this idea courtesy of @jasonpbecker on Twitter. htmlwidgets dependencies are defined by YAML. Let's see the dependencies for jsonedit.

jsonedit(
  yaml.load_file(system.file("htmlwidgets/jsonedit.yaml",package="listviewer"))
)

How about topojson?

### experiment with topojson
library(httr)
library(pipeR)
library(listviewer)

# topojson for Afghanistan
url_path = "https://gist.githubusercontent.com/markmarkoh/8856417/raw/6178d18115d9f273656d294a867c3f83b739a951/customAfghanMap.topo.json"

url_path %>>% 
  GET %>>%
  content( as = "text") %>>%
  jsonedit

reactjson

react-json-view is another very nice JSON interactive editor. We even get copy/paste! All of the above examples should also work with reactjson.

# using the data from the jsoneditor simple example
#  in R list form

library(listviewer)

reactjson(
  list(
    array = c(1,2,3)
    ,boolean = TRUE
    ,null = NULL
    ,number = 123
    ,object = list( a="b", c="d" )
    ,string = "Hello World"
  )
)

Shiny example

listviewer works with Shiny but the implementation is crude and likely to change for jsonedit while reactjson integration is much better. If you really want to use jsonedit with Shiny, I would recommend debouncing the change callback. Here are examples with each.

library(shiny)
library(listviewer)

# put some data in environment so it will show up
data(mtcars)

ui <- shinyUI(
  fluidPage(
    jsoneditOutput( "jsed" )
  )
)

server <- function(input,output){
  output$jsed <- renderJsonedit({
    jsonedit(
      as.list( .GlobalEnv )
      ,"change" = htmlwidgets::JS('function(){
        console.log( event.currentTarget.parentNode.editor.get() )
      }')
    )
    
  })
}

runApp( list( ui = ui, server = server ) )

library(shiny)
library(listviewer)

# put some data in environment so it will show up
data(mtcars)

ui <- shinyUI(
  fluidPage(
    reactjsonOutput( "rjed" )
  )
)

server <- function(input,output){
  output$rjed <- renderReactjson({
    reactjson( as.list( .GlobalEnv ) )
  })
  
  observeEvent(input$rjed_edit, {
    str(input$rjed_edit, max.level=2)
  })
}

runApp( list( ui = ui, server = server ) )

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