r - Prevent selectInput from wrapping text

Question

In a shiny app, is there a way to prevent the text of the dropdown in selectInput() from wrapping, as in the screenshot below? Each option is a long text string. I'd like the dropdown to show each long string on one line, without making a huge sidebar.

Answer 1

Taking inspiration from here and here you can add some custom css to the drowpdown

Here's a working example

library(shiny)

server <- function(input, output) {
    output$distPlot <- renderPlot({
        hist(rnorm(input$obs), col = 'darkgray', border = 'white')
    })
}

ui <- fluidPage(
    sidebarLayout(
        sidebarPanel(
            sliderInput("obs", "Number of observations:", min = 10, max = 500, value = 100),
            selectizeInput(inputId = "si",
                            label =  "select", 
                            choices = c("the quick brown fox jumped over the lazy dog the quick brown fox jumped over the lazy dog"), 
                            selected = NULL),

            ## Custom css               
            tags$head(
                tags$style(HTML('
                                .selectize-input {
                                    white-space: nowrap;
                                }
                                .selectize-dropdown {
                                    width: 660px !important;
                                }'
                                )
                        )
            )

        ),
        mainPanel(plotOutput("distPlot"))
    )
)

shinyApp(ui = ui, server = server)