R Shiny Make slider value dynamic

Question

I\'ve got a dropdown selector and a slider scale. I want to render a plot with the drop down selector being the source of data. - I\'ve got this part working

I simply wa

Answer 1

I think you're looking for the updateSliderInput function that allows you to programmatically update a shiny input: http://shiny.rstudio.com/reference/shiny/latest/updateSliderInput.html. There are similar functions for other inputs as well.

 observe({
     x.dataset.selection = input$selection
     if (x.dataset.selection == "raw") {
        x.num.rows = nrow(obatch)
     } else {
        x.num.rows = nrow(eset.spike)
     }
     # Edit: Turns out updateSliderInput can't do this, 
     # but using a numericInput with 
     # updateNumericInput should do the trick.
     updateSliderInput(session, "probes",
       label = paste("Slider label", x.dataset.selection),
       value = c(1,x.num.rows))
 })