我想在我的应用程序中添加深色模式。我知道可以使用 bs_theme() 来实现,但是当我使用 bs_theme() 时,我的应用程序中的许多设置都无法从外部 css 文件中读取。
我希望有两个单独的 CSS 文件,一个用于浅色主题,另一个用于深色主题。根据用户输入,在我的 Rshiny 应用程序中加载相应的主题文件。你有什么建议吗?
library(shinyjs)
中的addCssClass
/ removeCssClass
(或toggleCssClass
)。library(shiny)
library(shinyjs)
if(!dir.exists("www")){
dir.create("www")
}
writeLines(".dark {
background-color: black;
color: white; /* text color */
}", con = "www/dark_mode.css")
writeLines(".light {
background-color: white;
color: black; /* text color */
}", con = "www/light_mode.css")
ui <- fluidPage(
useShinyjs(),
tags$head(
tags$link(rel = "stylesheet", type = "text/css", href = "dark_mode.css"),
tags$link(rel = "stylesheet", type = "text/css", href = "light_mode.css")
),
radioButtons("mode", "Select mode", choices = c("dark", "light"), selected = "light")
)
server <- function(input, output, session) {
observeEvent(input$mode, {
if(input$mode == "dark"){
addCssClass(class = "dark", selector = "body")
removeCssClass(class = "light", selector = "body")
} else {
addCssClass(class = "light", selector = "body")
removeCssClass(class = "dark", selector = "body")
}
})
}
shinyApp(ui, server)
可以通过使用Shiny.addCustomMessageHandler和一些自定义的JS代码,例如element.classList.add("myclass");
(参见this),来实现相同的功能。
addCssClass
应用于不同类别的输入框:library(shiny)
library(shinyjs)
if(!dir.exists("www")){
dir.create("www")
}
writeLines(".dark {
background-color: black !important;
color: white; /* text color */
}", con = "www/dark_mode.css")
writeLines(".light {
background-color: white !important;
color: black; /* text color */
}", con = "www/light_mode.css")
ui <- fluidPage(
useShinyjs(),
tags$head(
tags$link(rel = "stylesheet", type = "text/css", href = "dark_mode.css"),
tags$link(rel = "stylesheet", type = "text/css", href = "light_mode.css")
),
radioButtons("mode", "Select mode", choices = c("dark", "light"), selected = "light"),
selectizeInput("Test", "Test Input", choices = 1:10),
actionButton("testButton", "Test Button")
)
server <- function(input, output, session) {
observeEvent(input$mode, {
applyTo <- list(".selectize-input", ".btn-default")
if(input$mode == "dark"){
lapply(applyTo, function(x){
addCssClass(class = "dark", selector = x)
removeCssClass(class = "light", selector = x)
})
} else {
lapply(applyTo, function(x){
addCssClass(class = "light", selector = x)
removeCssClass(class = "dark", selector = x)
})
}
})
}
shinyApp(ui, server)
library(shiny)
library(shinyjs)
if(!dir.exists("www")){
dir.create("www")
}
writeLines(".dark {
background-color: black !important;
color: white; /* text color */
}", con = "www/dark_mode.css")
writeLines(".light {
background-color: white !important;
color: black; /* text color */
}", con = "www/light_mode.css")
ui <- fluidPage(
useShinyjs(),
tags$head(
tags$link(rel = "stylesheet", type = "text/css", href = "dark_mode.css"),
tags$link(rel = "stylesheet", type = "text/css", href = "light_mode.css")
),
radioButtons("mode", "Select mode", choices = c("dark", "light"), selected = "light"),
selectizeInput("Test", "Test Input", choices = 1:10),
actionButton("testButton", "Test Button")
)
server <- function(input, output, session) {
dm_classes <- paste(c(".selectize-input", ".btn-default"), collapse = ", ")
observeEvent(input$mode, {
if(input$mode == "dark"){
runjs(sprintf("document.querySelectorAll('%s').forEach(x=>x.classList.add('dark'));
document.querySelectorAll('%s').forEach(x=>x.classList.remove('light'));", dm_classes, dm_classes))
} else {
runjs(sprintf("document.querySelectorAll('%s').forEach(x=>x.classList.add('light'));
document.querySelectorAll('%s').forEach(x=>x.classList.remove('dark'));", dm_classes, dm_classes))
}
})
}
shinyApp(ui, server)
renderUI
:
library(shiny)
ui <- fluidPage(
tags$head(
uiOutput("css")
),
radioButtons("select", "Select mode", c("dark", "light"))
)
server <- function(input, output){
output[["css"]] <- renderUI({
cssfile <- paste0(input[["select"]], "mode.css")
tags$link(rel = "stylesheet", type = "text/css", href = cssfile)
})
}
shinyApp(ui, server)
.light .selectize-input, .selectize-control.single .selectize-input.input-active { background-color:red; border:0px; }
但是,我在浅色和深色模式下都看到了这种变化。在深色模式CSS中,我将颜色保持为白色并附加了类.dark。 - shivam_data_scientist