如何在R Shinydashboard中获取列表

Question

我得到的所有文本都像一个段落。 我想要所有列表格式的文本，例如-li in html。 请帮助我。 我尝试使用向量，但无法执行。 这就是我使用sep =“ \\ n”使用paste0方法附加每个文本的原因，但是\\ n没有出现新行。

我的ui.R文件是

# shinydashboard makes it easy to use Shiny to create dashboards
# shinydashboard requires Shiny 0.11 or above

#First Selecting the shiny Dashboard
library(shiny)
library(shinydashboard)
library(openxlsx)

FileNames <- list.files("ExcelSheets/")
countDays <- length(FileNames)
positive = 0
neutral = 0
negative = 0
count = 0
positiveTweets = ""
negativeTweets = ""
neutralTweets = ""
p = 1
nu = 1
ng = 1
for (i in seq(1, length(FileNames)))
{
  excelSheetData = read.xlsx(paste0("ExcelSheets/", FileNames[i]), startRow = 0, colNames = TRUE, detectDates = TRUE)
  countRows <- dim(excelSheetData)
  countRows <- countRows[1]

  rows <- countRows
  count = count + rows
  data = excelSheetData[, c("polarity", "polarity_confidence", "Text")]
  for (j in seq(1, rows)){
    if(data[j, 1] == "positive")
    {
      positive = positive + data[j, 2]
      positiveTweets = paste0(positiveTweets, paste0(paste(paste0(p, ":"), data[j,3]), "\n"))
      p = p + 1
    }
    else if(data[j, 1] == "negative")
    {
      negative = negative + data[j, 2]
      negativeTweets = paste0(negativeTweets, paste0(paste(paste0(ng, ":"), data[j,3]), "\n"))
      ng = ng + 1
    }
    else
    {
      neutral = neutral + data[j, 2]
      neutralTweets = paste0(neutralTweets, paste0(paste(paste0(nu, ":"), data[j,3]), "\n"))
      nu = nu + 1
    }
  }
}
total <- positive + negative + neutral
positivePercent <- round((positive * 100) / total)
negativePercent <- round((negative * 100) / total)
neutralPercent <- round((neutral * 100) / total)

countVect = c(positive, neutral, negative)


shinyUI(dashboardPage(
  dashboardHeader(title = "Sentiment Analysis"),
  dashboardSidebar(
    sidebarMenu(
      menuItem("Dashboard", tabName = "dashboard", icon = icon("dashboard")),
      menuItem("Tweets", icon = icon("twitter"),
               menuSubItem("Positive Tweets", tabName = "pTweets", icon = icon("thumbs-up")),
               menuSubItem("Neutral Tweets", tabName = "neuTweets", icon = icon("hand-spock-o")),
               menuSubItem("Negative Tweets", tabName = "negTweets", icon = icon("thumbs-down"))
      )
    )
  ),
  ## Body content
  dashboardBody(

    tabItems(
      # First tab content
      tabItem(tabName = "dashboard",
              div(class = "my-class", h2("Sentiment Analysis of Twitter Tweets using RapidMinor and Shiny Dashboard.")),
              fluidRow(
                valueBox(count, "Total Number of Tweets Analyzed in the competition", icon = icon("twitter"), width = 6),
                valueBox(countDays, "Number of Days ", icon = icon("calendar-check-o"), width = 6, color = "yellow")
              ),
              fluidRow(
                infoBox("Positive", paste(positivePercent, "%"), icon = icon("thumbs-up"), width = 4, fill = TRUE, color = "green"),
                infoBox("Neutral", paste(neutralPercent, "%"), icon = icon("hand-spock-o"), width = 4, fill = TRUE, color = "light-blue"),
                infoBox("Negative", paste(negativePercent, "%"), icon = icon("thumbs-down"), width = 4, fill = TRUE, color = "red")
              )
      ),

      # Positive Tweets tab content
      tabItem(tabName = "pTweets",
              h2("Positive Tweets #Brexit"),
              h4(positiveTweets)
      ),
      # Neutral Tweets tab content
      tabItem(tabName = "neuTweets",
              h2("Neutral Tweets #Brexit"),
              h4(neutralTweets)
      ),
      # Negative Tweets tab content
      tabItem(tabName = "negTweets",
              h2("Negative Tweets #Brexit"),
              h4(negativeTweets)
      )
    )
  )
))

我的server.R文件是

# This is the server logic for a Shiny web application.
# You can find out more about building applications with Shiny here:
#
# http://shiny.rstudio.com
#

library(shiny)
library(shinydashboard)

shinyServer(function(input, output) {

})

Answer 1

解决您的问题的一种可能的方法是，将带有html标记<br>向量而不是"\\n" （与cat和verbatimTextOutput ），然后将诸如positiveTweets包裹到HTML函数中，如下所示：

h4(HTML(positiveTwe‌​ets))

---

您还希望显示带有当前工作目录中文件名的新选项卡。

在下面的示例中，我创建了一个新的menuItem ，其中包含随机数量的具有随机名称的选项卡。

首先，在dashboardHeader我添加了ID为out1动态输出。

menuItemOutput("out1")

之后，在服务器端，出于测试目的，我定义了一个变量my_files ，其中包含随机数量的带有随机名称的选项卡。 每次您运行该应用程序时，它将进行更新。

最后，在renderUI我定义了menuItem （“文件”），并在其中放置了动态数量的menuSubItem ，这些lapply是使用lapply生成的。

output$out1 <- renderUI({ ... })

我还添加了一条注释，该注释试图解释如果要在应用程序运行时更新工作目录中的文件列表（以及应用程序中选项卡的名称）时可以执行的操作。

---

完整示例：

library(shiny)
library(shinydashboard)
#library(openxlsx)
rm(ui)
rm(server)


ui <- shinyUI(dashboardPage(
  dashboardHeader(title = "Sentiment Analysis"),
  dashboardSidebar(
    sidebarMenu(
      menuItem("Dashboard", tabName = "dashboard", icon = icon("dashboard")),
      menuItem("Tweets", icon = icon("twitter"),
               menuSubItem("Positive Tweets", tabName = "pTweets", icon = icon("thumbs-up")),
               menuSubItem("Neutral Tweets", tabName = "neuTweets", icon = icon("hand-spock-o")),
               menuSubItem("Negative Tweets", tabName = "negTweets", icon = icon("thumbs-down"))
      ),
      menuItemOutput("out1") # added
    )
  ),
  ## Body content
  dashboardBody(

    tabItems(
      # First tab content
      tabItem(tabName = "dashboard",
              div(class = "my-class", h2("Sentiment Analysis of Twitter Tweets using RapidMinor and Shiny Dashboard.")),
              fluidRow(
                #valueBox(count, "Total Number of Tweets Analyzed in the competition", icon = icon("twitter"), width = 6),
                valueBox(15, "Total Number of Tweets Analyzed in the competition", icon = icon("twitter"), width = 6),
                #valueBox(countDays, "Number of Days ", icon = icon("calendar-check-o"), width = 6, color = "yellow")
                valueBox(10, "Number of Days ", icon = icon("calendar-check-o"), width = 6, color = "yellow")
              ),
              fluidRow(
                #infoBox("Positive", paste(positivePercent, "%"), icon = icon("thumbs-up"), width = 4, fill = TRUE, color = "green"),
                infoBox("Positive", "80%", icon = icon("thumbs-up"), width = 4, fill = TRUE, color = "green"),
                infoBox("Neutral", "15%", icon = icon("hand-spock-o"), width = 4, fill = TRUE, color = "light-blue"),
                infoBox("Negative", "5%", icon = icon("thumbs-down"), width = 4, fill = TRUE, color = "red")
              )
      ),

      # Positive Tweets tab content
      tabItem(tabName = "pTweets",
              h2("Positive Tweets #Brexit"),
              #h4(positiveTweets)
              h4("Great")
      ),
      # Neutral Tweets tab content
      tabItem(tabName = "neuTweets",
              h2("Neutral Tweets #Brexit"),
              #h4(neutralTweets)
              h4("ok")
      ),
      # Negative Tweets tab content
      tabItem(tabName = "negTweets",
              h2("Negative Tweets #Brexit"),
              #h4(negativeTweets)
              h4("shit :D")
      )
    )
  )
))

server <- function(input, output) {

  #my_files will be updated each time you run the app
  #my_files <- list.files() 

  # for testing purposes generate 5 tabs with names given by random letters
  my_files <- letters[sample(1:26, 5)] 

  # There could also be the case when there is no files in a folder
  # You can handle it with `req` or `validate(need(...))` functions
  #my_files <- ""

  output$out1 <- renderUI({
    # Just in case if you would put new files to the folder
    # while the app is working and wanted an update of tabs:
    #   - create eventReactive with an actionButton which will
    #     return list.files().
    #   - pass new names of files to this renderUi function.

    # be careful because "tabName" must not have a "." in it.

    req(my_files) # show tabs only if there are files in a directory

    # generate and save tabs in a list
    tabs <- lapply(seq_along(my_files), function(i) {
      menuSubItem(my_files[i], tabName = my_files[i], icon = icon("thumbs-up"))
    })

    menuItem("Files", tabName = "Files", icon = NULL, tabs)
  })
}
shinyApp(ui, server)