Javascript 如何使用htmlOutput在R Shining应用程序中启用语法高亮显示

我有一个闪亮的应用程序，它根据用户输入动态生成计算机代码，并将其呈现给用户，以便用户能够准确地看到向数据库发送的查询。我有prism语法高亮显示，用于直接在用户界面函数中的代码，因此我知道prism正在工作；但是对于在服务器中生成并通过renderText和htmlOutput发送给用户的代码，高亮显示不起作用

下面是一个简单示例的图像：

它是用这个R文件和Shining应用程序的www文件夹中的prism.css和prism.js制作的

   ui <- shinyUI(fluidPage(
  tags$head(
    tags$link(rel = "stylesheet", type = "text/css", href = "prism.css")
  ),
  tags$body(
    tags$script(src="prism.js")
  ),
  HTML("<pre><code class='language-sql'>SELECT * FROM mytable WHERE 1=2
       -- this chunk should be syntax highlighted and it is
       </code></pre>"),

  HTML("<pre>SELECT * FROM mytable WHERE 1=2
       -- this chunk should not be syntax highlighted
       </code></pre>"),

  htmlOutput("sql")
)
)


# Define the server code
server <- function(input, output) {
  txt <- "<pre><code class='language-sql'>SELECT * FROM mytable WHERE 1=2
       -- this chunk should be syntax highlighted but isn't for some reason,
       -- presumably connected to it getting to the UI via renderText and htmlOutput
       </code></pre>"

  output$sql <- renderText(txt)
}

, HTML， htmlOutputsql 定义服务器代码

---

服务器Prism.js在加载后立即运行，因此随后动态添加的任何代码块都不会突出显示。一种选择是在服务器函数中动态加载prism.js

, HTML， htmlOutputsql 服务器

output$sql <- renderUI({
  tagList(
    tags$script(src = "prism.js"),
    HTML(txt)
  )
})

library(shiny)

prismCodeBlock <- function(code) {
  tagList(
    HTML(code),
    tags$script("Prism.highlightAll()")
  )
}

prismDependencies <- tags$head(
  tags$script(src = "https://cdnjs.cloudflare.com/ajax/libs/prism/1.8.4/prism.min.js"),
  tags$link(rel = "stylesheet", type = "text/css",
            href = "https://cdnjs.cloudflare.com/ajax/libs/prism/1.8.4/themes/prism.min.css")
)

prismSqlDependency <- tags$head(
  tags$script(src = "https://cdnjs.cloudflare.com/ajax/libs/prism/1.8.4/components/prism-sql.min.js")
)

ui <- fluidPage(
  prismDependencies,
  prismSqlDependency,

  HTML("<pre><code class='language-sql'>SELECT * FROM mytable WHERE 1=2
       -- this chunk should be syntax highlighted and it is
       </code></pre>"),

  HTML("<pre>SELECT * FROM mytable WHERE 1=2
       -- this chunk should not be syntax highlighted
       </code></pre>"),

  htmlOutput("sql")
)

server <- function(input, output) {
  txt <- "<pre><code class='language-sql'>SELECT * FROM mytable WHERE 1=2
  -- this chunk should be syntax highlighted but isn't for some reason,
  -- presumably connected to it getting to the UI via renderText and htmlOutput
  </code></pre>"

  output$sql <- renderUI({
    prismCodeBlock(txt)
  })
}

shinyApp(ui, server)