Reset row selection for DT::renderDataTable() in Shiny R - r

Question

I reproduced an example shiny app written by Yihui Xie (https://yihui.shinyapps.io/DT-rows/). The app uses DT::renderDataTable() which allows a row selection.
Everything works perfectly fine. I was however wondering if it's possible to reset the row selection (i.e. undo the click selection) ? I already tried it with an action button to reset s = input$x3_rows_selected (see script below).
With my current script,s = input$x3_rows_selected does indeed get emptied, I can however not refill it. Also the selected rows are still clicked (shaded)
Does anyone has an idea? Is there an option within DT::renderDataTable() to reset the selection? Or does anyone has an idea for a workaround?
Thank you!
Example form https://yihui.shinyapps.io/DT-rows/) with my modification (action button):
server.R
library(shiny)
library(DT)
shinyServer(function(input, output, session) {
# you must include row names for server-side tables
# to be able to get the row
# indices of the selected rows
mtcars2 = mtcars[, 1:8]
output$x3 = DT::renderDataTable(mtcars2, rownames = TRUE, server = TRUE)
# print the selected indices
selection <- reactive({
if (input$resetSelection)
vector() else input$x3_rows_selected
})
output$x4 = renderPrint({
if (length(selection())) {
cat("These rows were selected:\n\n")
output <- selection()
cat(output, sep = "\n")
}
})
})
ui.R
library(shiny)
shinyUI(
fluidPage(
title = 'Select Table Rows',
h1('A Server-side Table'),
fluidRow(
column(9, DT::dataTableOutput('x3')),
column(3, verbatimTextOutput('x4'),
actionButton('resetSelection',
label = "Click to reset row selection"
) # end of action button
) #end of column
)))

Answer 1

In the current development version of DT (>= 0.1.16), you can use the method selectRows() to clear selections. Please see the section "Manipulate An Existing DataTables Instance" in the documentation.

Answer 2

Here is a possible solution, maybe not the best but it works. It is based on re-create the datatable each time the action button is clicked, so the selected rows are removed.
library(shiny)
library(DT)
runApp(list(
server = function(input, output, session) {
mtcars2 = mtcars[, 1:8]
output$x3 = DT::renderDataTable({
# to create a new datatable each time the reset button is clicked
input$resetSelection
mtcars2
}, rownames = TRUE, server = TRUE
)
# print the selected indices
selection <- reactive ({
input$x3_rows_selected
})
output$x4 = renderPrint({
if (length(selection())) {
cat('These rows were selected:\n\n')
output <- selection()
cat(output, sep = '\n')
}
})
},
ui = shinyUI(fluidPage(
title = 'Select Table Rows',
h1('A Server-side Table'),
fluidRow(
column(9, DT::dataTableOutput('x3')),
column(3, verbatimTextOutput('x4'),
actionButton( 'resetSelection',label = "Click to reset row selection")
) #end of column
)
))
))