Set max-width on a DT::renderDataTable()?

[dougfir]

I would like to set a max width, as opposed to just width, on a DT::renderDataTable() in shiny.

Slight modification to out of the box shiny app within rstudio UI:

#
# This is a Shiny web application. You can run the application by clicking
# the 'Run App' button above.
#
# Find out more about building applications with Shiny here:
#
#    http://shiny.rstudio.com/
#

library(shiny)

# Define UI for application that draws a histogram
ui <- fluidPage(

    # Application title
    titlePanel("Old Faithful Geyser Data"),

    # Sidebar with a slider input for number of bins 
    sidebarLayout(
        sidebarPanel(
            sliderInput("bins",
                        "Number of bins:",
                        min = 1,
                        max = 50,
                        value = 30)
        ),

        # Show a plot of the generated distribution
        mainPanel(
           DT::DTOutput("sometable")
        )
    )
)

# Define server logic required to draw a histogram
server <- function(input, output) {
    
    output$sometable <- DT::renderDataTable(
        data.frame(
            x = c('A', 'AAA', 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA'),
            y = 1:3
        ),
        extensions = c('Buttons', 'Scroller', 'FixedColumns'), 
        options = list(dom = 'Bt', scrollY = 400, scrollX = T,
                       scroller = T, buttons = c('copy', 'csv'), 
                       fixedColumns = list(leftColumns = 1)),
        rownames = F
    )

    output$distPlot <- renderPlot({
        # generate bins based on input$bins from ui.R
        x    <- faithful[, 2]
        bins <- seq(min(x), max(x), length.out = input$bins + 1)

        # draw the histogram with the specified number of bins
        hist(x, breaks = bins, col = 'darkgray', border = 'white')
    })
}

# Run the application 
shinyApp(ui = ui, server = server)

Looks like this:

Is there some way that I can set the maximum width of the x column? e.g. 100px? Show up to a max of 100px and then after that just chop the text from view?