I would like to add a vertical line to a DT table column header. There is guidance for adding this line in post How can I add a vertical line to a datatable?, but it applies to a static table where columns are manually set whereas in my MWE code (at bottom), the columns are set using the lapply() function in a reactive setting. So I'm having trouble using this guidance in my particular circumstances.
Any suggestions for adding a vertical line to the right of the left-most column header labeled "to_state"? As shown in this image which shows a portion of the output window when running the MWE code:
Please note that in the fuller code this MWE derives from, the table expands/contracts dynamically depending on the number of unique states detected in the underlying data. Therefore I can't use a static table set up like in the referenced related post above.
Once this is resolved, I'll have several additional questions as I struggle to make a transition table readily understandable for users (such as change the "to_state" left-most column header to "To end Period = [xxx]", but that will be addressed in another post). I'm tackling this formatting issue incrementally in baby steps.
I am very unfamiliar with HTML, CSS.
Here is the MWE code:
library(DT)
library(shiny)
library(htmltools)
library(data.table)
data <-
data.frame(
ID = c(1,1,1,2,2,2,3,3,3),
Period = c(1, 2, 3, 1, 2, 3, 1, 2, 3),
Values = c(5, 10, 15, 0, 2, 4, 3, 6, 9),
State = c("X0","X1","X2","X0","X2","X0", "X2","X1","X0")
)
numTransit <- function(x, from=1, to=3){
setDT(x)
unique_state <- unique(x$State)
all_states <- setDT(expand.grid(list(from_state = unique_state, to_state = unique_state)))
dcast(x[, .(from_state = State[from],
to_state = State[to]),
by = ID]
[,.N, c("from_state", "to_state")]
[all_states,on = c("from_state", "to_state")],
to_state ~ from_state, value.var = "N"
)
}
ui <- fluidPage(
tags$head(tags$style(".datatables .display {margin-left: 0;}")), # < left-align the table
h4(strong("Base data frame:")),
tableOutput("data"),
h4(strong("Transition table inputs:")),
numericInput("transFrom", "From Period:", 1, min = 1, max = 3),
numericInput("transTo", "To Period:", 2, min = 1, max = 3),
h4(strong("Output transition table:")),
DTOutput("resultsDT"),
)
server <- function(input, output, session) {
results <-
reactive({
results <- numTransit(data, input$transFrom, input$transTo) %>%
replace(is.na(.), 0) %>%
bind_rows(summarise_all(., ~(if(is.numeric(.)) sum(.) else "Sum")))
results <- cbind(results, Sum = rowSums(results[,-1]))
})
output$data <- renderTable(data)
output$resultsDT <- renderDT(server=FALSE, {
req(results())
datatable(
data = results(),
rownames = FALSE,
filter = 'none',
container = tags$table(
class = 'display',
tags$thead(
tags$tr(
tags$th(colspan = 1, '', style = "border-right: solid 1px;"),
tags$th(colspan = 10, sprintf('From initial Period = %s', input$transFrom))
),
tags$tr(
lapply(colnames(results()),
tags$th
)
),
)
),
options = list(scrollX = F
, dom = 'ft'
, lengthChange = T
, pagingType = "numbers" # hides Next and Previous buttons
, autoWidth = T
, info = FALSE # hide the "Showing 1 of 2..." at bottom of table
, searching = FALSE # removes search box
),
class = "display"
) %>%
formatStyle(c(1), `border-right` = "solid 1px")
})
}
shinyApp(ui, server)
