R shiny widgetFunc() warning messages with eventReactive(warning 1) and renderDataTable (warning 2)

Question

I'm writing a shiny app and it was working perfectly fine and all of a sudden I am getting two warning messages. I have gone back to previous copies that ran fine and they are now showing the same error messages, so I am really confused.My code still runs and shows accurate results on the results tab of my shiny dashboard, but I want to track down the warning messages. I debug and the first warning goes away with the rendDataTable and the second warning comes up when I click a tab on my dashboard. The data is a data frame n X 10 with numeric and characters. Any help would be greatly appreciated. If I can provide any more info, just let me know.

Here's 1:

Warning in widgetFunc() :
  renderDataTable ignores ... arguments when expr yields a datatable object; see ?renderDataTable
Warning: Error in cat: argument 1 (type 'environment') cannot be handled by 'cat'
Stack trace (innermost first):
    74: cat
    73: eval
    72: eval
    71: withVisible
    70: evalVis
    69: utils::capture.output
    68: paste
    67: output$ntext1
     1: shiny::runApp

Here's 2:

Warning in widgetFunc() :
  renderDataTable ignores ... arguments when expr yields a datatable object; see ?renderDataTable

tran_cd=c('I','E','R')
data_source_cd=c('1','2','3','4')
library(shiny)
library(shinydashboard)
library(xlsx)
if (!require("DT")) install.packages('DT')
sessionInfo()
library(DT)
ui <- dashboardPage(
  dashboardHeader(title = "ARC"),
  dashboardSidebar(sidebarMenu(
    menuItem("Settings", tabName = "settings", icon = icon("th")),
    menuItem("Results Table", tabName = "ResultsTable", icon = icon("ResultsTable")))),
  dashboardBody(
    tabItems(tabName = "ResultsTable",
              fluidPage(  
                headerPanel(
                  h1("Anomaly List", align="center",  style = "font-family: 'Verdana';font-weight: 800; line-height: 1.1;   color: #151515;")),
                # fluidRow(
                #     column(8, DT::dataTableOutput("table",width = "100%"),offset = 2)))),
                #                 # Create a new Row in the UI for selectInputs
                fluidRow(

                  column(4,
                         selectInput("sour",
                                     "Source Type:",
                                     c("All",
                                       unique(as.character(data_source_cd))))
                  ),
                  column(4,
                         selectInput("sour1",
                                     "Source Type:",
                                     c("All",
                                       unique(as.character(data_source_cd))))
                  ),
                  column(4,
                         selectInput("tran",
                                     "Transaction Type:",
                                     c("All",
                                       unique(as.character(tran_cd)))))),
                # Create a new row for the table.
                fluidRow(column(8, DT::dataTableOutput("table",width = "100%"),offset = 2))))
)))




library(shiny)
library(chron)
library(forecast)
library(ggplot2)
#names(iris) = gsub("\\.", "", names(iris))
setwd("C:/Users/Name/Documents/Projects/TrendAnalysis/Data")
source("C:/Users/Documents/Projects/TrendAnalysis/Rcode/App-1/MonitoringIngestion.R")
df=read.csv('list.csv',header=TRUE, stringsAsFactors = FALSE)
df=unique(df[,1:3])
dfrn=df[,2];
rownames(df)=make.names(dfrn, unique=TRUE)
shinyServer(function(input, output, session) {
  rv <- reactiveValues()
  rv$data <- NULL

  ntext1 <- eventReactive(input$gobutton,{
    if (input$dateRange[2]<input$dateRange[1]){print("You selected the date range option;however, the end date entered occurs before the starting date")}
    else{
      output$ntext1 <- renderText({print("Analysis Complete...Data Loading...")});
      observe({    ## will 'observe' the button press
        if(input$gobutton){ 
          print("here")  ## for debugging
          Singledate=input$date;
          Daterange=input$dateRange;
          Alldata=input$checkbox;
          SourceSelect=input$checkGroup1;
          TranSelect=input$checkGroup2;
          AirlineSelect=input$x3_rows_selected;
          Mag_level=input$slider1;
          rv$data <- MonitoringDDSIngestion(Alldata,Singledate,Daterange,SourceSelect,TranSelect,AirlineSelect,Mag_level)   ## store the data in the reactive value
        }
      })
    }
  }) 

  output$table <- DT::renderDataTable(DT::datatable({
     data <- rv$data
    if (input$sour != "All") {
      data <- data[data[,1] == input$sour,]
    }else{data}
     if (input$sour1 != "All") {
       data <-data[data[,2] == input$sour1,]
     }else{data}

     if (input$tran != "All") {
       data <-data[data[,3] == input$tran,]
     }else{data}

  }), filter='top')
})


MonitoringIngestion2 <-function(All,date1,date2, source_cd,tran_cd,airline_list,mag_level) {
    print(All); print(date1); print(date2); print(source_cd);print(tran_cd);print(airline_list);print(mag_level)
    setwd("C:Documents/Projects//Data")
    data = read.csv("November2015_December2015.csv",header=TRUE,sep=",",colClasses="factor")
  }
data  

Answer 1

You are getting this error because you are returning a DT::datatable AND you are also specifying filter='top' as one of the ... arguments to DT::renderDataTable. As the message is trying to tell you ... arguments are ignored since you are returning a DT::datatable. This is because the ... arguments are intended to be passed through to the DT:datatable constructor.

Either move filter='top' inside the DT::datatable constructor or return a data.frame and the filter='top will be used when DT::renderDataTable constructs a DT::datatable with your specified data.frame.