r - Input ID not initialized when defined within conditionalPanel -

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in sidebar of shiny app, looking offer filtering values of variable when checkbox activating filter has been checked before. trying implement follows:

checkboxinput("filterbydistrict", "activate filtering district", false),    conditionalpanel(     condition = "input.filterbydistrict == true",     checkboxgroupinput(       "districts",        label = "choose district:",        choices = choiceslist,       selected = choiceslist     )   )

what found districts input variable never gets initiated. using on server side, check existence fails:

... if(exists(input$districts)) { ...

what missing/doing wrong?

your input defined, exists doesn't work list elements, try :

"districts" %in% names(input) # or !is.null(input$districts)

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