我正在尝试在 DT 表的行中包含 Shiny 的小部件，例如 textInput、selectInput(单个)、sliderInput 和 selectInput(多个)。当小部件直接放在页面上时，它们会正确显示，但是当它们放在表格中时，其中一些不会正确显示。
textInput 很好，selectInput(单个)除了一些 css 差异外大部分都很好，但是 selectInput(多个)显示不正确，sliderInput 肯定显示不正确。似乎依赖 javascript 的小部件是有问题的。有没有办法让这些widgets在DT表中正常工作？
这是我的可重现示例。在将小部件放入表中时，我使用了小部件的原始 HTML，但我直接从每个小部件的 shiny 函数生成的 HTML 中获取了它。
library(shiny)
library(DT)
ui <- fluidPage(
h3("This is how I want the widgets to look in the DT table."),
fluidRow(column(3, textInput(inputId = "text",
label = "TEXT")),
column(3, selectInput(inputId = "single_select",
label = "SINGLE SELECT",
choices = c("", "A", "B", "C"))),
column(3, sliderInput(inputId = "slider",
label = "SLIDER",
min = 0,
max = 10,
value = c(0, 10))),
column(3, selectizeInput(inputId = "multiple_select",
label = "MULTIPLE SELECT",
choices = c("", "A", "B", "C"),
multiple = TRUE))),
h3("This is how they actually appear in a DT table."),
fluidRow(DTOutput(outputId = "table"))
)
server <- function(input, output, session) {
output$table <- renderDT({
data <- data.frame(ROW = 1:5,
TEXT = '<input id="text" type="text" class="form-control" value=""/>',
SINGLE_SELECT = '<select id="single_select" style="width: 100%;">
<option value="" selected></option>
<option value="A">A</option>
<option value="B">B</option>
<option value="C">C</option>
</select>',
SLIDER = '<input class="js-range-slider" id="slider" data-type="double" data-min="0" data-max="10" data-from="0" data-to="10" data-step="1" data-grid="true" data-grid-num="10" data-grid-snap="false" data-prettify-separator="," data-prettify-enabled="true" data-keyboard="true" data-drag-interval="true" data-data-type="number"/>',
MULTIPLE_SELECT = '<select id="multiple_select" class="form-control" multiple="multiple">
<option value=""></option>
<option value="A">A</option>
<option value="B">B</option>
<option value="C">C</option>
</select>',
stringsAsFactors = FALSE)
datatable(data = data,
selection = "none",
escape = FALSE,
rownames = FALSE)
})
}
shinyApp(ui = ui, server = server)
最佳答案
slider
对于 slider ，您必须从文本输入开始:
SLIDER = '<input type="text" id="s" name="slider" value="" />'
然后用 JavaScript 把它变成一个 slider :
js <- c(
"function(settings){",
" $('#s').ionRangeSlider({",
" type: 'double',",
" grid: true,",
" grid_num: 10,",
" min: 0,",
" max: 20,",
" from: 5,",
" to: 15",
" });",
"}"
)
参见 ionRangeSlider对于选项。
您可以使用 initComplete 选项传递 JavaScript 代码:
server <- function(input, output, session) {
output$table <- renderDT({
data <- data.frame(ROW = 1:5,
TEXT = '<input id="text" type="text" class="form-control" value=""/>',
SINGLE_SELECT = '<select id="single_select" style="width: 100%;">
<option value="" selected></option>
<option value="A">A</option>
<option value="B">B</option>
<option value="C">C</option>
</select>',
SLIDER = '<input type="text" id="s" name="slider" value="" />',
MULTIPLE_SELECT = '<select id="multiple_select" class="form-control" multiple="multiple">
<option value=""></option>
<option value="A">A</option>
<option value="B">B</option>
<option value="C">C</option>
</select>',
stringsAsFactors = FALSE)
datatable(data = data,
selection = "none",
escape = FALSE,
rownames = FALSE,
options =
list(
initComplete = JS(js)
))
})
}
然后你只得到第一行的 slider :
那是因为五个文本输入具有相同的 id。您必须为五个文本输入设置不同的 ID:
SLIDER = sapply(1:5, function(i) {
sprintf('<input type="text" id="Slider%d" name="slider" value="" />', i)
}),
然后使用这段 JavaScript 代码将它们变成 slider :
js <- c(
"function(settings){",
" $('[id^=Slider]').ionRangeSlider({",
" type: 'double',",
" grid: true,",
" grid_num: 10,",
" min: 0,",
" max: 20,",
" from: 5,",
" to: 15",
" });",
"}"
)
要设置 from 和 to 的初始值，最好将它们放在输入文本的 value 参数中，如下所示:
SLIDER = sapply(1:5, function(i) {
sprintf('<input type="text" id="Slider%d" name="slider" value="5;15" />', i)
})
js <- c(
"function(settings){",
" $('[id^=Slider]').ionRangeSlider({",
" type: 'double',",
" grid: true,",
" grid_num: 10,",
" min: 0,",
" max: 20",
" });",
"}"
)
多选
要获得所需的多选显示，您必须调用 selectize():
MULTIPLE_SELECT = '<select id="mselect" class="form-control" multiple="multiple">
<option value=""></option>
<option value="A">A</option>
<option value="B">B</option>
<option value="C">C</option>
</select>'
js <- c(
"function(settings){",
" $('[id^=Slider]').ionRangeSlider({",
" type: 'double',",
" grid: true,",
" grid_num: 10,",
" min: 0,",
" max: 20",
" });",
" $('#mselect').selectize()",
"}"
)
同样，这仅适用于第一个多选。使用个人 ID 申请这五个。
绑定(bind)
最后，您必须绑定(bind)输入以获得它们在 Shiny 中可用的值:
datatable(data = data,
selection = "none",
escape = FALSE,
rownames = FALSE,
options =
list(
initComplete = JS(js),
preDrawCallback = JS('function() { Shiny.unbindAll(this.api().table().node()); }'),
drawCallback = JS('function() { Shiny.bindAll(this.api().table().node()); } ')
)
)
现在您可以获取 input$Slider1、input$Slider2、... 和 input$mselect 中的值。请注意，input$Slider[1/2/3/4/5] 以这种格式返回 slider 的值:"3;15"。
关于javascript - DT 表中的 Shiny 小部件，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/55034483/