Description Usage Arguments Server value See Also Examples
Creates an action button or link whose value is initially zero, and increments by one each time it is pressed.
1 2 3 | actionButton(inputId, label, icon = NULL, width = NULL, ...)
actionLink(inputId, label, icon = NULL, ...)
|
inputId |
The |
label |
The contents of the button or linkâusually a text label, but you could also use any other HTML, like an image. |
icon |
An optional |
width |
The width of the input, e.g. |
... |
Named attributes to be applied to the button or link. |
An integer of class "shinyActionButtonValue"
. This class differs from
ordinary integers in that a value of 0 is considered "falsy".
This implies two things:
Event handlers (e.g., observeEvent()
, eventReactive()
) won't execute on initial load.
Input validation (e.g., req()
, need()
) will fail on initial load.
observeEvent()
and eventReactive()
Other input elements:
checkboxGroupInput()
,
checkboxInput()
,
dateInput()
,
dateRangeInput()
,
fileInput()
,
numericInput()
,
passwordInput()
,
radioButtons()
,
selectInput()
,
sliderInput()
,
submitButton()
,
textAreaInput()
,
textInput()
,
varSelectInput()
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | ## Only run examples in interactive R sessions
if (interactive()) {
ui <- fluidPage(
sliderInput("obs", "Number of observations", 0, 1000, 500),
actionButton("goButton", "Go!"),
plotOutput("distPlot")
)
server <- function(input, output) {
output$distPlot <- renderPlot({
# Take a dependency on input$goButton. This will run once initially,
# because the value changes from NULL to 0.
input$goButton
# Use isolate() to avoid dependency on input$obs
dist <- isolate(rnorm(input$obs))
hist(dist)
})
}
shinyApp(ui, server)
}
|
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