conditionalPanel Display but condition is not met - R Shiny -

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i have started ui using shiny r, having problem layout of page.

the problem facing second conditionalpanel showing though not selected. put selected='item1' in radiobuttons, checkboxgroupinput of item2 showing well.

what problem here , how go around fixing it? there error or mistake in code?

library("shiny")  shinyui(navbarpage("title", tabpanel("subtitle1",  sidebarlayout(   sidebarpanel(       checkboxgroupinput("variable1","items:",                          c("item1","item2"))),   mainpanel(    plotoutput("plot")       )   )  ),  tabpanel("subtitle2",          sidebarlayout(              sidebarpanel(                  radiobuttons(                      inputid="item",                      label="item selection:",                      choices=list(                          "item1","item2"),                      selected='item1'                              ), # show when item1 selected. become invisible when other items selected.                  conditionalpanel(                      condition="input.item == 'item1'",                      checkboxgroupinput(                          "variable2",                          "countries:",                          choices=names(quantityi),                          selected= "world.")                                  ), # show when item2 selected. become invisible when other items selected.                  conditionalpanel(                      condition="input.item == 'item2'",                      checkboxgroupinput(                          "variable2",                          "countries:",                          choices=names(quantityi),                          selected= "world.")                                  )                         ),             mainpanel(                      plotoutput("plot")                           )                       )          )))

i have found solution problem. thank lot wannes rosiers, have found , troubleshoot error.

for both mainpanel @ tabpanel subtitle1 , subtitle2, both of having same plotoutput, "plot",

mainpanel(  plotoutput("plot")     )

both of them should have different output, though not sure reason behind it.


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