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With my non-comprehensive look through Shiny documentation, it appears that the only requirement for a Shiny widget inputId is that it is a character string. However, I have discovered that if you have spaces in that character string, the updateWidget function doesn't behave properly (it basically is ignored, with no error message). My simple repro, where I change the id from "bin" to "Number of bins" documents the problem:
library(shiny)
ui <- fluidPage(
sidebarLayout(
sidebarPanel(
sliderInput("Number of bins",
"Number of bins:",
min = 1,
max = 50,
value = 30),
actionButton("IncreaseBins", "Increase max number of bins")
),
mainPanel(
plotOutput("distPlot")
)
)
)
server <- function(input, output, session) {
output$distPlot <- renderPlot({
x <- faithful[, 2]
bins <- seq(min(x), max(x), length.out = input[["Number of bins"]] + 1)
hist(x, breaks = bins, col = 'darkgray', border = 'white')
})
observeEvent(input$IncreaseBins, {
updateSliderInput(session, "Number of bins", max = 100)
})
}
shinyApp(ui = ui, server = server)
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