可重现的例子:

require(shiny)
runApp(list(ui = pageWithSidebar(
headerPanel("Example"),
  sidebarPanel(
    sliderInput("index", 
                label = "Select a number",
                min = 1,
                max = 4,
                step = 1,
                value = 2)),
  mainPanel(
  htmlOutput("text")
  )),
server = function(input, output) {
  output$text <- renderUI({
    HTML(paste(c("banana","raccoon","duck","grapefruit")))
  })
}
))

我希望索引对应的单词(默认为“raccoon”)以粗体显示，其他单词以普通字体显示。

如果我这样做:

HTML(
<b>paste(c("banana","raccoon","duck","grapefruit")[input$index])<\b>,
paste(c("banana","raccoon","duck","grapefruit")[setdiff(1:4,input$index)])
)

我收到一个错误(< 无法识别)...

最佳答案

再试一次，有用吗？

require(shiny)

fruits <- c("banana","raccoon","duck","grapefruit")

runApp(list(ui = pageWithSidebar(
  headerPanel("Example"),
  sidebarPanel(
    sliderInput("index", 
                label = "Select a number",
                min = 1,
                max = 4,
                step = 1,
                value = 2)),
  mainPanel(
    htmlOutput("text")
  )),
  server = function(input, output) {
    output$text <- renderUI({
      fruits[input$index] <- paste("<b>",fruits[input$index],"</b>")
      HTML(paste(fruits))
    })
  }
))

https://stackoverflow.com/questions/33392784/