How do I add plus and minus arrows to sliderInput() in shiny? - r

Question

I am developing a shiny app and want to improve the accuracy of the slider (the slider ranges from 0 to 1000 and it's very difficult to accurately adjust the slider with a step of 1). I can't find an answer to this anywhere.
This is the code for one of my sliders:
sliderInput("mean2", "", min=0, max=1000, value=500, step=1)

Answer 1

Try arranging your code like such:
library(shiny)
ui <- fluidPage(
# Application title
titlePanel("Old Faithful Geyser Data"),
actionButton("minus", "Minus"),
actionButton("plus", "Plus"),
# Sidebar with a slider input for number of bins
sidebarLayout(
sidebarPanel(
sliderInput("mean2",
"Number of bins:",
min = 0,
max = 1000,
value = 500,
step= 1)
),
# Show a plot of the generated distribution
mainPanel(
plotOutput("distPlot")
)
)
)
server <- function(input, output, session) {
v <- reactiveValues(data = 500)
observeEvent(input$minus, {
v$data <- input$mean2 - 1
updateSliderInput(session,"mean2", value = input$mean2 - 1)
})
observeEvent(input$plus, {
v$data <- input$mean2 + 1
updateSliderInput(session,"mean2", value = input$mean2 + 1)
})
observeEvent(input$mean2, {
v$data <- input$mean2
})
output$distPlot <- renderPlot({
# generate bins based on input$bins from ui.R
x <- faithful[, 2]
bins <- seq(min(x), max(x), length.out = v$data + 1)
# draw the histogram with the specified number of bins
hist(x, breaks = bins, col = 'darkgray', border = 'white')
})
}
shinyApp(ui, server)