Checkboxes in DT shiny

I'm trying to make checkboxs into DT table and collect information about checked rows.
My code below

shinyApp(
  ui = fluidPage(
    fluidRow(
      verbatimTextOutput("value1"),
      column(12,
             DT::dataTableOutput('table'),  tags$script(HTML('$(document).on("click", "input", function () {
                       var checkboxes = document.getElementsByName("selected");
                       var checkboxesChecked = [];
                       for (var i=0; i<checkboxes.length; i++) {
                       if (checkboxes[i].checked) {
                       checkboxesChecked.push(checkboxes[i].value);
                      }
                      }
                     Shiny.onInputChange("checked_rows",checkboxesChecked);  })'))
      ))),
  server = function(input, output) {
    library(DT)
    library(glue)
    output$value1 <- renderPrint({ input$checked_rows }) 

    output$table <- DT::renderDataTable({
      iris$checked<-''
      iris$checked[2:5]<-'checked=\"checked\"'
      iris[["Select"]]<-glue::glue('<input type="checkbox" name="selected" {iris$checked} value="{1:nrow(iris)}"><br>')
      datatable(iris,escape=F,rownames=F,  class = 'cell-border compact', 
                options=list(ordering=T,autowidth=F,scrollX = TRUE,
                columnDefs = list(list(className = 'dt-center', targets = "_all"))
                ),
                selection="none"
      ) })})

All looking good, but:
1. when I make a choice in checkboxes and change the page, all data from the previous page disappears.
2. Also, as you can see on verbatimTextOutput ("value1"), it's worth selecting only checkboxes from the current page. How can I poll the entire table, and not just the page that I see?

Thanks!