r - Dynamic column alignment in DT datatable -

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i have larger datatable output varying number of columns, chose in widget. dynamically right align columns,but found solution if number of columns fixed. hoping adjust reference in target= command make dynamic. somehow not work , not output when number of columns smaller default reference. read somewhere reactive statements not work datatable options. attached mwe.

rm(list=ls())  library(shiny) library(datasets) library(datatable) dt<-data.table(matrix(abs(rnorm(100,sd=100000)),nrow=10))   server<-shinyserver(function(input, output) {    # return requested dataset   columns <- reactive({     switch(input$columns,         all= c("v1","v2","v3","v4","v5","v6","v7","v8","v9","v10"),         left= c("v1","v2","v3","v4","v5"),         right= c("v6","v7","v8","v9","v10"))            })     # show table   output$view <- dt::renderdatatable(     format(dt[,.sd,.sdcols=columns()],digits = 0,scientific=f),       option=list(columndefs=list(list(targets=0:(length(columns())-1), class="dt-right")))   ) })    library(shiny)  # define ui dataset viewer application ui<-shinyui(fluidpage(    # application title   titlepanel("shiny text"),    # sidebar controls select dataset , specify   # number of observations view   sidebarlayout(     sidebarpanel(      selectinput("columns", label = h3("select columns"),                     choices = list("all columns" = "all", "left side" = "left",                                     "right side" = "right"), selected = "all")     ),      # show summary of dataset , html table       # requested number of observations     mainpanel(       dt::datatableoutput("view")     )   ) ))    runapp(list(ui=ui,server=server))

datatable options not reactive in sense can't change options without redrawing entire table, if willing redraw table isn't problem see below:

if change server function should work:

server<-shinyserver(function(input, output) {    # return requested dataset   columns <- reactive({     switch(input$columns,            all= c("v1","v2","v3","v4","v5","v6","v7","v8","v9","v10"),            left= c("v1","v2","v3","v4","v5"),            right= c("v6","v7","v8","v9","v10"))   })    # reactive datatable    rdt <- reactive({     dt::datatable(format(dt[,.sd,.sdcols=columns()],digits=0,scientific=false),                   option=list(columndefs=list(                     list(targets=seq_len(length(columns()))-1,                           class="dt-right"))))   })     # show table   output$view <- dt::renderdatatable(     rdt()     )  })

i creating reactive datatable responds columns() , redraws table correct columndef. if had lot of data slow.


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