我想将颜色选择器作为列类型放在应用程序的 arhandsontable中shiny。colourInput()从包中使用colourpicker，我可以将颜色选择器添加为独立输入，从 HTML 标记创建它们，或将它们放入 HTML 表中（参见下面的示例代码）。是否可以将颜色选择器输入控件添加到rhandsontable列？
最终目标是一个允许用户从 MS Excel 等电子表格复制数据并粘贴到rhandsontable对象中的应用程序，包括指定颜色名称或十六进制代码的文本。用户可以通过覆盖文本或通过光标操作从选择器中选择颜色来编辑颜色。该应用程序稍后将获取这些输入、执行计算并以指定的颜色绘制结果。
下面是一些示例代码，显示了两次失败的尝试。任何意见，将不胜感激。另外，我对 JavaScript 一无所知。colourpicker和rhandsontable vignettes 是极好的资源，但我仍然无法弄清楚。
最小的例子
library(shiny); library(rhandsontable); library(colourpicker)
hotDF <- data.frame(Value = 1:4, Status = TRUE, Name = LETTERS[1:4],
Date = seq(from = Sys.Date(), by = "days", length.out = 4),
Colour = sapply(1:4, function(i) {
paste0(
'<div class="form-group shiny-input-container"
data-shiny-input-type="colour">
<input id="myColour',i,'" type="text"
class="form-control shiny-colour-input" data-init-value="#FFFFFF"
data-show-colour="both" data-palette="square"/>
</div>'
)}), stringsAsFactors = FALSE)
testColourInput <- function(DF){
ui <- shinyUI(fluidPage( rHandsontableOutput("hot") ))
server <- shinyServer(function(input, output) {
DF2 <- transform(DF, Colour = c(sapply(1:4, function(x) {
jsonlite::toJSON(list(value = "black"))
}))) #create DF2 for attempt #2
output$hot <- renderRHandsontable({
#Attempt #1 = use the HTML renderer
#Results in no handsontable AND no HTML table <-- why no HTML table too?
rhandsontable(DF) %>% hot_col(col = "Colour", renderer = "html")
#Attempt #2 = use colourWidget
#Results are the same as above.
#rhandsontable(DF2) %>%
# hot_col(col = "Colour", renderer = htmlwidgets::JS("colourWidget"))
})
}) #close shinyServer
runApp(list(ui=ui, server=server))
} #close testColorInput function
testColourInput(DF = hotDF)
屏幕抓取的扩展示例：
library(shiny); library(rhandsontable); library(colourpicker)
#Colour cells ideally would be a colourInput() control similar to the Date input control
hotDF <- data.frame(Value = 1:4, Status = TRUE, Name = LETTERS[1:4],
Date = seq(from = Sys.Date(), by = "days", length.out = 4),
Colour = sapply(1:4, function(i) {
paste0(
'<div class="form-group shiny-input-container"
data-shiny-input-type="colour">
<input id="myColour',i,'" type="text"
class="form-control shiny-colour-input"
data-init-value="#FFFFFF"
data-show-colour="both" data-palette="square"/>
</div>'
)}),
stringsAsFactors = FALSE)
testColourInput <- function(DF){
ui <- shinyUI(fluidPage(
sidebarLayout(
sidebarPanel(
#Standalone colour Input
colourInput("myColour", label = "Just the color control:", value = "#000000"),
br(),
HTML("Build the colour Input from HTML tags:"), br(),
HTML(paste0(
"<div class='form-group shiny-input-container'
data-shiny-input-type='colour'>
<input id='myColour", 999,"' type='text'
class='form-control shiny-colour-input'
data-init-value='#FFFFFF' data-show-colour='both'
data-palette='square'/>
</div>"
))
),
mainPanel(
HTML("Failed attempt"),
rHandsontableOutput("hot"),
br(), br(),
HTML("Success, but this is not a rhandsontable"),
uiOutput("tableWithColourInput")
)
)
))
server <- shinyServer(function(input, output) {
#create DF2 for attempt #2
DF2 <- transform(DF, Colour = c(sapply(1:4, function(x) {
jsonlite::toJSON(list(value = "black"))
})))
output$hot <- renderRHandsontable({
#Attempt #1 = use the HTML renderer
#Results in no handsontable AND no HTML table <-- why no HTML table too?
rhandsontable(DF) %>% hot_col(col = "Colour", renderer = "html")
#Attempt #2 = use colourWidget
#Results are the same as above.
#rhandsontable(DF2) %>%
# hot_col(col = "Colour", renderer = htmlwidgets::JS("colourWidget"))
#Uncomment below to see the table without html formatting
#rhandsontable(DF)
#^This line was uncommented to obtain the screengrab
})
#HTML table
myHTMLtable <- data.frame(Variable = LETTERS[1:4],
Select = NA)
output$tableWithColourInput <- renderUI({
#create table cells
rowz <- list()
#Fill out table cells [i,j] with static elements
for( i in 1:nrow( myHTMLtable )) {
rowz[[i]] <- tags$tr(lapply( myHTMLtable[i,1:ncol(myHTMLtable)],
function( x ) { tags$td( HTML(as.character(x)) ) }
) )
}
#Add colourInput() to cells in the "Select" column in myHTMLtable
for( i in 1:nrow( myHTMLtable ) ) {
#Note: in the list rowz:
# i = row; [3] = row information; children[1] = table cells (list of 1);
# $Select = Column 'Select'
rowz[[i]][3]$children[[1]]$Select <- tags$td(
colourInput(inputId = as.character(paste0("inputColour", i)),
label = NULL, value = "#000000")
)
}
mybody <- tags$tbody( rowz )
tags$table(
tags$style(HTML(
".shiny-html-output th,td {border: 1px solid black;}"
)),
tags$thead(
tags$tr(lapply( c("Variable!", "Colour!"), function( x ) tags$th(x)))
),
mybody
) #close tags$table
}) #close renderUI
}) #close shinyServer
runApp(list(ui=ui, server=server))
} #close testColorInput function
testColourInput(DF = hotDF)
