Rendering a shiny datatable with a caption/title and pre-selected rows - r

Question

I'm trying to code a shiny app for plotting xy data. Each xy point is associated with several factors:
set.seed(1)
data.df <- data.frame(x = rnorm(1000), y = rnorm(1000),
sex = sample(c("F", "M"), 1000, replace = T),
age = sample(c("Y", "O"), 1000, replace = T),
group = sample(c("A", "B", "C", "D"), 1000, replace = T),
stringsAsFactors = F)
design.df <- data.frame(factor.name = c(c(rep("sex",2), rep("age",2), rep("group",4))),
factor.levels = c("F", "M","Y", "O","A", "B", "C", "D"), stringsAsFactors = F)
I would like to enable the user to subset the xy data (data.df) based on a selection of multiple rows from design.df using DT::renderDT within renderUI in the server, where the default selection is all rows of design.df. This works fine using this code:
suppressPackageStartupMessages(library(dplyr))
suppressPackageStartupMessages(library(shiny))
suppressPackageStartupMessages(library(DT))
server <- function(input, output)
{
output$design.idx <- renderUI({
output$design.df <- DT::renderDT(design.df, server = TRUE, selection = list(mode = "multiple", selected = rownames(design.df)[1:nrow(design.df)]))
DT::dataTableOutput("design.df")
})
xy.plot <- reactive({
if(!is.null(input$design.df_rows_selected)){
selected.design.df <- design.df[input$design.df_rows_selected,,drop = FALSE]
selected.idx <- lapply(unique(selected.design.df$factor.name), function(f) which(data.df[,f] %in% dplyr::filter(selected.design.df, factor.name == f)$factor.levels)) %>%
unlist() %>% unique()
plot.df <- data.df[selected.idx,,drop=F]
xy.plot <- suppressWarnings(plotly::plot_ly(marker = list(size = 3), type = 'scatter', mode = "markers", x = plot.df$x, y = plot.df$y, showlegend = FALSE) %>%
plotly::layout(xaxis = list(zeroline = FALSE, showticklabels = FALSE, showgrid = FALSE), yaxis = list(zeroline = FALSE, showticklabels = FALSE, showgrid = FALSE)))
} else{
xy.plot <- NULL
}
return(xy.plot)
})
output$outPlot <- plotly::renderPlotly({
xy.plot()
})
}
ui <- fluidPage(
titlePanel("Results Explorer"),
sidebarLayout(
sidebarPanel(
uiOutput("design.idx")
),
mainPanel(
plotly::plotlyOutput("outPlot")
)
)
)
shinyApp(ui = ui, server = server)
But I would also like to have a title or caption for the rendered datatable, so I tried replacing:
output$design.df <- DT::renderDT(design.df, server = TRUE, selection = list(mode = "multiple", selected = rownames(design.df)[1:nrow(design.df)]))
with:
output$design.df <- DT::renderDT(datatable(design.df, caption = "Subset Selection"), server = TRUE, selection = list(mode = "multiple", selected = rownames(design.df)[1:nrow(design.df)]))
in which case the selected = rownames(design.df)[1:nrow(design.df)] argument seems to be ignored and the default selection is no rows.
Changing selected = rownames(design.df)[1:nrow(design.df)] to selected = 1:nrow(design.df) makes no difference.
Any idea how to get both a title or caption to the rendered table together with have all rows as a pre-selection default?

Answer 1

You have to put selection in the datatable object:
output$design.df <- DT::renderDT(
datatable(design.df,
caption = "Subset Selection",
selection = list(mode = "multiple",
selected = rownames(design.df)[1:nrow(design.df)])
),
server = TRUE)