R Shiny, how to make datatable react to checkboxes in datatable - r

Question

I would like my datatable to display content which depends on the status of checkboxes contained in the table. I have found help with both, including checkboxes in a DT as well as changing data table content, but when I try and combine these solutions I don't get what I want. When checking a box, the table is redrawn twice, the first time the way I want but a moment later it switches back.
This is the code which should almost do... Is there someone out there to help before I get crazy?
library(shiny)
library(DT)
shinyApp(
ui = fluidPage(
DT::dataTableOutput('x1'),
verbatimTextOutput('x2')
),
server = function(input, output, session) {
# create a character vector of shiny inputs
shinyInput = function(FUN, len, id, ...) {
inputs = character(len)
for (i in seq_len(len)) {
inputs[i] = as.character(FUN(paste0(id, i), label = NULL, ...))
}
inputs
}
# obtain the values of inputs
shinyValue = function(id, len) {
unlist(lapply(seq_len(len), function(i) {
value = input[[paste0(id, i)]]
if (is.null(value)) TRUE else value
}))
}
n = 6
df = data.frame(
cb = shinyInput(checkboxInput, n, 'cb_', value = TRUE, width='1px'),
month = month.abb[1:n],
YN = rep(TRUE, n),
ID = seq_len(n),
stringsAsFactors = FALSE)
loopData = reactive({
df$YN <<- shinyValue('cb_', n)
df
})
output$x1 = DT::renderDataTable(
isolate(loopData()),
escape = FALSE, selection = 'none',
options = list(
dom = 't', paging = FALSE, ordering = FALSE,
preDrawCallback = JS('function() { Shiny.unbindAll(this.api().table().node()); }'),
drawCallback = JS('function() { Shiny.bindAll(this.api().table().node()); } ')#,
))
proxy = dataTableProxy('x1')
observe({
replaceData(proxy, loopData())
})
output$x2 = renderPrint({
data.frame(Like = shinyValue('cb_', n))
})
}
)

Answer 1

Yes, your example code almost works. The only thing not right is that the value of df$cb needs to be changed, too.
For example, let's say you clicked the second row and input$cb_2 gets changed. shiny would record that input$cb_2 got changed to FALSE. Since the value of df$cb[[2]] was still checkbox(..., value = TRUE), when the table gets re-drawed, a checked checkbox would be displayed and R thought that input$cb_2 got changed again and so your data would be altered correspondly.
Checked the example code if there's anything uncleared.
The worked example code
library(shiny)
library(DT)
shinyApp(
ui = fluidPage(
DT::dataTableOutput('x1'),
verbatimTextOutput('x2')
),
server = function(input, output, session) {
# create a character vector of shiny inputs
shinyInput = function(FUN, len, id, value, ...) {
if (length(value) == 1) value <- rep(value, len)
inputs = character(len)
for (i in seq_len(len)) {
inputs[i] = as.character(FUN(paste0(id, i), label = NULL, value = value[i]))
}
inputs
}
# obtain the values of inputs
shinyValue = function(id, len) {
unlist(lapply(seq_len(len), function(i) {
value = input[[paste0(id, i)]]
if (is.null(value)) TRUE else value
}))
}
n = 6
df = data.frame(
cb = shinyInput(checkboxInput, n, 'cb_', value = TRUE, width='1px'),
month = month.abb[1:n],
YN = rep(TRUE, n),
ID = seq_len(n),
stringsAsFactors = FALSE)
loopData = reactive({
df$cb <<- shinyInput(checkboxInput, n, 'cb_', value = shinyValue('cb_', n), width='1px')
df$YN <<- shinyValue('cb_', n)
df
})
output$x1 = DT::renderDataTable(
isolate(loopData()),
escape = FALSE, selection = 'none',
options = list(
dom = 't', paging = FALSE, ordering = FALSE,
preDrawCallback = JS('function() { Shiny.unbindAll(this.api().table().node()); }'),
drawCallback = JS('function() { Shiny.bindAll(this.api().table().node()); } ')
))
proxy = dataTableProxy('x1')
observe({
replaceData(proxy, loopData(), resetPaging = FALSE)
})
output$x2 = renderPrint({
data.frame(Like = shinyValue('cb_', n))
})
}
)