When dealing with a range that has a significantly large gap, like 2000, using the built-in sliderInput to make small adjustments can be challenging. I am considering implementing two textInputs to work in conjunction with the sliderBar for more precise control over the min and max values simultaneously. Are there any potential methods to achieve this?
If you're looking to update the values of elements, I suggest using the updateSliderInput and updateTextInput functions. These functions allow you to easily update the specified Values elements like so:
updateSliderInput(session, "slider_id", value = c(0,1))
updateTextInput(session, "text_id", placeholder = "placeholder")
Another option is to use renderUI, but for most cases, it's best to stick with the update-functions for better performance.
The code snippet below demonstrates a shiny module named controledSlider. This module requires min, max, and value as arguments and displays a slider, two text boxes, and an action button.
library(shiny)
controlledSliderUI <- function(id){
ns = NS(id)
wellPanel(
sliderInput(ns("slider"), NULL, 0, 1, c(0, 1)),
textInput(ns("min"), "min", 0, "50%"),
textInput(ns("max"), "max", 100, "50%"),
actionButton(ns("update"), "update slider")
)
}
controlledSlider <- function(input, output, session, min, max, value){
reactiveRange <- reactiveValues(min = value[1], max = value[2])
updateSliderInput(session, "slider", min = min, max = max)
## observe slider
observeEvent(input$slider,{
reactiveRange$min <- input$slider[1]
reactiveRange$max <- input$slider[2]
}, ignoreInit = TRUE)
## observe button
observeEvent(input$update,{reactiveRange$min <- as.numeric(input$min)})
observeEvent(input$update,{reactiveRange$max <- as.numeric(input$max)})
## observe reactive
observeEvent({reactiveRange$min; reactiveRange$max},{
updateSliderInput(
session, "slider", value = c(reactiveRange$min, reactiveRange$max))
updateTextInput(session, "min", value = reactiveRange$min)
updateTextInput(session, "max", value = reactiveRange$max)
})
return(reactiveRange)
}
The module returns a reactiveValue object that can be accessed and updated from the main server function.
shinyApp(
fluidPage(
controlledSliderUI("mySlider"),
verbatimTextOutput("text")
),
function(input, output, session){
range <- callModule(controlledSlider, "mySlider", 0, 1200, c(100,1000))
range$max <- 1001 ## updating max value
output$text <- renderPrint({
print(range$min)
print(range$max)
})
}
)
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