I am looking to create a conditional panel in shiny that becomes active if the input that user selects from a list (i.e. selectInput function) belongs to another vector.

I am aware that the condition in the conditional panel is a javascript element, however I cannot make it work.

Can someone help?

Here is the UI part of the code under examination:

legs1 <- c("HOUSE","VILLA","ATTICO")

selectInput("strategy", "Strategy:", choices = df[,6]),

conditionalPanel(
           
          condition = 'input.strategy && input.strategy.indexOf("legs1") > -1',
                              
          textInput("Leg1", "Leg1",value = ""),
          textInput("Leg2","Leg2", value =""),
          
          ),