ShinyDashboard动态子弹点

Question

我希望有一个简单的问题，把一个标签顺序列表传递到一个闪亮的仪表板上。我想要做的是有一个函数，根据一个过滤的类别，生成一个排序的项目点列表。

下面是一个简单的示例，说明我希望能够使用名为nba_teams的数据框架做什么

teams    conference
Bulls    Eastern
Nuggets  Western
Celtics  Eastern
Lakers   Western

现在，如果我编写这个函数，它将列出相应会议的列表：

for (row in 1:nrow(nba_teams)){
  teams <- nba_teams[row, "teams"]
  conference <- nba_teams[row,"conference"]

  if(grepl("Western",conference)){
   print(tags$li(teams))
 }
}

​

• 鸡块
• 湖人队

​

我想要做的是在一个选项卡框中这样做：

box(
 title = "Western Conference",
 tags$ol(
  for (row in 1:nrow(nba_teams)){
  teams <- nba_teams[row, "teams"]
  conference <- nba_teams[row,"conference"]

  if(grepl("Western",conference)){
   print(tags$li(teams))
 }
})),

但这只会使方框成为空白，不会为每个观察结果填充一个子弹点。

有什么建议吗？谢谢!

Answer 1

在这种情况下，我会使用lapply：

library(shiny)  
library(shinydashboard)

nba_teams <- data.frame(team = c("Bulls", "Nuggest", "Celtics", "Lakers"),
                        conference = c("Eastern", "Western", "Eastern", "Western"))

ui <- dashboardPage(
  dashboardHeader(),
  dashboardSidebar(),
  dashboardBody(
    box(
      title = "Western Conference",
      tags$ol(
        lapply(1:nrow(nba_teams), function(x) {
          if (nba_teams$conference[x]=="Western") {
            return(tags$li(nba_teams$team[x]))
          }
        })
      )
    )
  )
)

server <- function(input, output, session) {}

shinyApp(ui, server)