我试图在表中包含LateX公式,并使用MathJack库这样做。在modalDialog之外,每件事情都运行得很顺利,但是当表在modalDialog中生成时,它并没有像预期的那样显示出来。我猜它必须使用在帮助页面中编写的内容“它只需要在一个应用程序中被调用一次,除非在页面加载之后呈现内容,例如通过renderUI(),在这种情况下,我们必须在每次向输出写入数学表达式时显式地调用它。”但我想不出怎么解决这个问题。
下面是一个重复:
library(shiny)
ui <- shinyUI(
fluidPage(
withMathJax(),
actionButton("open", "Open")))
server <- function(input, output, session){
output$mytable <- renderTable({
df <- data.frame(A = c(HTML("$$\\alpha+\\beta$$"), "$$\\alpha+\\gamma$$", "$$\\alpha+\\lambda$$"),B = c(111111, 3333333, 3123.233))
df
}, sanitize.text.function = function(x) x)
observeEvent(input$open, {
showModal(modalDialog(
withMathJax(),
h2("$$\\mbox{My Math example }\\sqrt{2}$$"),
tableOutput('mytable')))
})
}
shinyApp(ui = ui, server = server)
发布于 2022-02-17 10:23:23
奇怪的是,它是这样工作的:
observeEvent(input$open, {
showModal(withMathJax(modalDialog(
h2("$$\\mbox{My Math example }\\sqrt{2}$$"),
withMathJax(tableOutput('mytable')))))
})
编辑
由于该解决方案存在一些问题,下面是使用KaTeX而不是MathJax的解决方案。
library(shiny)
js <- "
$(document).on('shiny:value', function(event) {
if(event.name === 'mytable'){
// h2 element
var $h2 = $('#title');
var title = $h2.html();
var matches_title = title.match(/(%%+[^%]+%%)/g);
var i, code;
for(i=0; i<matches_title.length; i++){
code = matches_title[i].slice(2,-2);
title = title.replace(matches_title[i], katex.renderToString(code));
}
$h2.html(title);
$h2.css('visibility', 'visible');
// table:
var matches = event.value.match(/(%%+[^%]+%%)/g);
var newvalue = event.value;
for(i=0; i<matches.length; i++){
code = matches[i].slice(2,-2);
newvalue = newvalue.replace(matches[i], katex.renderToString(code));
}
event.value = newvalue;
}
})
"
css <- "#mytable td:nth-child(3) {display: none;}"
ui <- fluidPage(
tags$head(
tags$link(rel="stylesheet", href="https://cdn.jsdelivr.net/npm/katex@0.15.2/dist/katex.min.css", integrity="sha384-MlJdn/WNKDGXveldHDdyRP1R4CTHr3FeuDNfhsLPYrq2t0UBkUdK2jyTnXPEK1NQ", crossorigin="anonymous"),
tags$script(defer="", src="https://cdn.jsdelivr.net/npm/katex@0.15.2/dist/katex.min.js", integrity="sha384-VQ8d8WVFw0yHhCk5E8I86oOhv48xLpnDZx5T9GogA/Y84DcCKWXDmSDfn13bzFZY", crossorigin="anonymous"),
tags$script(HTML(js)),
tags$style(HTML(css))
),
titlePanel("Hello Shiny!"),
br(),
actionButton("open", "Open")
)
server <- function(input, output, session){
output$mytable <- renderTable({
data.frame(
A = c("%%\\alpha+\\beta%%", "%%\\alpha+\\gamma%%", "%%\\alpha+\\lambda%%"),
B = c(111111, 3333333, 3123.233),
` ` = rep(input$open, 3),
check.names = FALSE
)
}, sanitize.text.function = function(x) x)
observeEvent(input$open, {
showModal(modalDialog(
h2(
id = "title",
style = "visibility: hidden;",
"%%\\boxed{Math}\\sqrt{2}%%"
),
tableOutput("mytable")
))
})
}
shinyApp(ui, server)
请注意,我在dataframe中包含了一个反应性列:
` ` = rep(input$open, 3)
这是因为如果我不这样做的话,KaTeX呈现只能工作一次。然后我用一些CSS隐藏这个专栏。
https://stackoverflow.com/questions/71138708
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