Slider Input Widget

https://shiny.rstudio.com/articles/sliders.html

https://stackoverflow.com/questions/36906265/how-to-color-sliderbar-sliderinput

#runExample("05_sliders")
server <- function(input, output, session){}
ui <- fluidPage(
  titlePanel("Sliders!"),
  sidebarLayout(
    sidebarPanel(
      # Single Value ----
      sliderInput("integer", "Integer", min=0, max=1000, value=500,        step=10),
      # Range
      sliderInput("range",   "Range:",  min=1, max=1000, value=c(200,500), step=1),
      # CSS from .js-irs-0  ---- 
      tags$style(HTML(".js-irs-2 .irs-single,
                       .js-irs-2 .irs-bar-edge,
                       .js-irs-2 .irs-bar { background: red }
                ")),
      sliderInput("slider1", "Red",       min=0.1, max=1,     value=0.4,  step=0.05),
      tags$style(HTML(".js-irs-3 { background:#FFFFFF00; }
                       .js-irs-3 .irs-bar-edge { background:#FFFFFF00; border:1px solid #CCC; border-right:1px solid #FFFFFF00; }
                       .js-irs-3 .irs-line { border: 1px solid #CCC }
                       .js-irs-3 .irs-bar  { background:linear-gradient(to bottom, #DDD -50%, #FFF 150%);
                                             border-top:1px solid #CCC; border-bottom:1px solid #CCC; }
                ")),
      sliderInput("slider2", "One Value", min=100, max=20000, value=5000, step=200),
      
      # Animation ----
      sliderInput("format",   "Custom Format:",       min=0, max=10000, value=0, step=2500,
                  pre = "$", sep = ",", 
                  animate = TRUE),
      sliderInput("animation", "Looping Animation:",  min=1, max=2000,  value=1, step=10,
                  animate = animationOptions(interval = 300, loop = TRUE)) 
    ),
    mainPanel()
  )
)
shinyApp(ui,server)