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The Sliders application demonstrates the many capabilities of slider controls, including the ability to run an animation sequence. To run the example type:
{% highlight console %}
library(shiny) runExample("05_sliders") {% endhighlight %}
Customizing Sliders
Shiny slider controls are extremely capable and customizable. Features supported include:
- The ability to input both single values and ranges
- Custom formats for value display (e.g for currency)
- The ability to animate the slider across a range of values
Slider controls are created by calling the sliderInput function. The ui.R file demonstrates using sliders with a variety of options:
ui.R
{% highlight r %} library(shiny)
Define UI for slider demo application
shinyUI(pageWithSidebar(
Application title
headerPanel("Sliders"),
Sidebar with sliders that demonstrate various available options
sidebarPanel( # Simple integer interval sliderInput("integer", "Integer:", min=0, max=1000, value=500),
# Decimal interval with step value
sliderInput("decimal", "Decimal:",
min = 0, max = 1, value = 0.5, step= 0.1),
# Specification of range within an interval
sliderInput("range", "Range:",
min = 1, max = 1000, value = c(200,500)),
# Provide a custom currency format for value display, with basic animation
sliderInput("format", "Custom Format:",
min = 0, max = 10000, value = 0, step = 2500,
format="$#,##0", locale="us", animate=TRUE),
# Animation with custom interval (in ms) to control speed, plus looping
sliderInput("animation", "Looping Animation:", 1, 2000, 1, step = 10,
animate=animationOptions(interval=300, loop=T))
),
Show a table summarizing the values entered
mainPanel( tableOutput("values") ) )) {% endhighlight %}
Server Script
The server side of the Slider application is very straightforward: it creates a data frame containing all of the input values and then renders it as an HTML table:
server.R
{% highlight r %} library(shiny)
Define server logic for slider examples
shinyServer(function(input, output) {
Reactive expression to compose a data frame containing all of the values
sliderValues <- reactive({
# Compose data frame
data.frame(
Name = c("Integer",
"Decimal",
"Range",
"Custom Format",
"Animation"),
Value = as.character(c(input$integer,
input$decimal,
paste(input$range, collapse=' '),
input$format,
input$animation)),
stringsAsFactors=FALSE)
})
Show the values using an HTML table
output$values <- renderTable({ sliderValues() }) }) {% endhighlight %}