r - Disable textInput based on radio button selection on Shiny -


say have following shiny app:

library(shiny) ui <- fluidpage(   column(3,          radiobuttons("radios", "",                       c("enabled" = "enabled",                         "disabled" = "disabled"),                       inline = true)   ),   column(4, textinput("text", "", value = "disable me")) ) server <- function(input, output) {  } shinyapp(ui=ui, server=server)

what's easiest way disable textinput based on selected radio button? know have add ... disabled /> input tag, have no idea on how in shiny.

i tried building full tag "manually" pasting html string, selected radio value , rest of html, using uioutput , renderui (based on this), didn't work.

the textinputgenerates this:

<input id="text" type="text" class="form-control" value="disable me"/>

and need able switch between above , this:

<input id="text" type="text" class="form-control" value="disable me" disabled />

you session$sendcustommessage on server (which generates javascript disables or enables text box) , shiny.addcustommessagehandler in ui (which executes javascript).

library(shiny) ui <- fluidpage(   tags$head(tags$script(html('       shiny.addcustommessagehandler("jscode",         function(message) {           eval(message.code);         }       );     '))),   column(3,          radiobuttons("radios", "",                       c("enabled" = "enabled",                         "disabled" = "disabled"),                       inline = true)   ),   column(4, textinput("text", "", value = "disable me")) ) server <- function(input, output, session) {   observe({     if(input$radios == "disabled") {       session$sendcustommessage(type="jscode",                                 list(code= "$('#text').prop('disabled',true)"))     } else {       session$sendcustommessage(type="jscode",                                 list(code= "$('#text').prop('disabled',false)"))     }   }) } shinyapp(ui=ui, server=server)

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