I have an application shiny containing reactive data. I would like the application to select only non-empty columns for the X and Y axes. At the moment I choose between colnames(TD[,3:7]), but there are also empty values for columns, so I don't want these columns to show up for the variable selection. Below is an example and my code:
type <- as.character(c('summer','summer','summer','summer','winter','winter','winter','winter'))country <- as.character(c('A','A','B','B','A','A','B','B'))year <- c(2011,2012,2013,2014,2011,2012,2013,2014)col1 <- c(33,7,NA,NA,5,11,NA,NA)col2 <- c(10,3,NA,NA,8,15,NA,NA)col3 <- c(NA,NA,10,15,NA,NA,20,25)col4 <- c(NA,NA,8,5,NA,NA,22,16)TD <- data.frame(type,country,year,col1,col2,col3,col4,stringsAsFactors=FALSE)library(readxl)library(shiny)library(ggplot2)library(shinythemes)library(DT)ui <-shinyUI(fluidPage(pageWithSidebar( headerPanel("Test App"), sidebarPanel( selectInput("type","Choose a type", choices = c("All",unique(TD$type))), selectInput("country","Choose an country", choices = c("All",unique(TD$country))), selectInput("yaxis", "Choose a y variable", choices = colnames(TD[,3:7])), selectInput("xaxis", "Choose a x variable", choices = colnames(TD[,3:7])), actionButton("goButton", "Update") ), mainPanel( tabsetPanel( tabPanel('Plot', plotOutput("plot1")) )))))server <- shinyServer(function(input,output, session){ data1 <- reactive({ if(input$type == "All"){ TD } else{ TD[which(TD$type == input$type),] } }) data2 <- eventReactive(input$goButton,{ if (input$country == "All"){ TD }else{ TD[which(TD$country == input$country),] } }) observe({ if(input$type != "All"){ updateSelectInput(session,"country","Choose a country", choices = c("All",unique(data1()$country))) } else if(input$country != 'All'){ updateSelectInput(session,"type","Choose a type", choices = c('All',unique(data2()$type))) } else if (input$type == "All"& input$country == "All"){ updateSelectInput(session,"country","Choose a country", choices = c('All',unique(TD$country))) updateSelectInput(session,"type","Choose a type", choices = c('All',unique(TD$type))) } }) data3 <- eventReactive( input$goButton,{ req(input$goButton) req(input$goButton) if(input$country == "All"){ data1() } else if (input$type == "All"){ data2() } else if (input$country == "All"& input$type == "All"){ TD } else { TD[which(TD$country== input$country & TD$type == input$type),] } }) x_var<- eventReactive(input$goButton, { input$xaxis }) y_var <- eventReactive(input$goButton,{ input$yaxis }) output$plot1 <- renderPlot({ x <- x_var() y <- y_var() p <- ggplot(data3(),aes(x=data3()[,x], y=data3()[,y])) + geom_line() + geom_point() p + labs(x = x_var(), y = y_var()) + theme(plot.title = element_text(hjust = 0.5, size=20)) })})shinyApp(ui,server)
