首先,这是一个可重复性最小的例子：
假设我有以下flexdashboard应用程序示例.Rmd：
---
title: "Test App"
output:
flexdashboard::flex_dashboard:
theme: ["lumen"]
orientation: ["columns"]
runtime: shiny
---
```{r setup, include=FALSE}
source('modules.R')
```
Test
==================
Inputs {.sidebar data-width=250}
------------------
```{r}
## Modules:
globalInputs <- callModule(setup, "inputs") # Note: you only need to call this one time!
callModule(chart, "modalChart", globalInputs)
## UI:
sidebar("inputs")
```
Column
-------------------------------------
### ModalTest
```{r}
chartUI2("modalChart")
```
这是我的modules.R文件：
sidebar <- function(id) {
ns <- NS(id)
tagList(
helpText("Press the button below to pull up a modal:"),
actionButton(ns("settings"), "Settings", icon = icon("cogs"), width = '100%')
)
}
# setup function
setup <- function(input, output, session) {
return(input) ## Note, input in this case is a reactive list of values that you can index against with $or [[""]]
}
# UI module for the popup Settings modal
modalUI <- function(id) {
ns <- NS(id)
withTags({ # UI elements for the modal go in here
## Note: you can use the fluidPage() and fluidRow() functions to define a column-based UI for the chart inputs below:
fluidPage(
fluidRow(sliderInput(ns("bins"), "Number of bins:",
min = 1, max = 50, value = 30),
textInput(ns("plotTitle"), label = "Plot Title", value = "This is a test")
))
})
}
## UI module for the 2 buttons in the modal:
modalFooterUI <- function(id) {
ns <- NS(id)
tagList(
modalButton("Cancel", icon("remove")),
actionButton(ns("modalApply"), "Apply", icon = icon("check"))
)
}
## chart module ----------------------------------------------------------------
chartUI2 <- function(id) {
ns <- NS(id)
plotOutput(ns("distPlot"))
}
chart <- function(input, output, session, setup) {
observeEvent(setup$settings, {
showModal(modalDialog(
modalUI("inputs"), # Call UI function defined in './modules/modal.R'; note the namespace 'inputs' is the same globally for the app
title = "Settings",
footer = modalFooterUI("inputs"),
size = "l",
easyClose = TRUE,
fade = TRUE)
)
})
output$distPlot <- renderPlot({
if (setup$settings == 0)
return(
hist(faithful[, 2],
breaks = 5, # if the button hasn't been pressed, default
main = 'This is the default title',
col = 'darkgray',
border = 'white')
)
isolate({
x <- faithful[, 2]
bins <- setup$bins
hist(x,
breaks = bins,
main = setup$plotTitle,
col = 'darkgray',
border = 'white')
})
})
}
这就是我想要完成的事情：
>页面加载时使用默认参数渲染distPlot.这应该总是发生.
>当我单击“设置”动作按钮时,它会弹出模态覆盖(但将背景中的绘图保持为原始状态)
>允许用户更改弹出模式中的参数,但在用户点击“应用”按钮之前不要重新渲染绘图.
我想我已经#1想通了,但是当我点击’设置’按钮时,我得到一个错误’breaks(x)’产生的无效断点：NULL.然后,我改变输入,它什么都不做(除非我再次点击Settings actionButton(这反过来渲染了给定输入的图).
我究竟做错了什么？
谢谢！！
最佳答案 可能存在时间问题.当您按下设置按钮时,setup $settings变为1,因此renderPlot会尝试重新绘制.如果在设置滑块之前发生这种情况,则设置$bins为NULL并且您收到错误.
只有当用户按下模态中的“应用”按钮时,您才可以在renderPlot的第一个if中添加条件以使用setup $bins进行绘图：
output$distPlot <- renderPlot({
if (setup$settings == 0 | !isTruthy(setup$modalApply)) {
hist(faithful[, 2],
breaks = 5, # if the button hasn't been pressed, default
main = 'This is the default title',
col = 'darkgray',
border = 'white')
} else {
isolate({
x <- faithful[, 2]
bins <- setup$bins
hist(x,
breaks = bins,
main = setup$plotTitle,
col = 'darkgray',
border = 'white')
})
！如果setup $modalApply为NULL(尚未创建模态)或者为0(用户尚未按下按钮),则isTruthy将为TRUE.
用户按下“应用”按钮后,将更新绘图.
编辑：
为了方便起见,您可以使用reactiveValues来保存所有绘图参数,包括默认参数.当用户单击“应用”按钮时,可以更新它,然后更新绘图：
plot_params = reactiveValues(bins=5,title='This is the default title')
output$distPlot <- renderPlot({
hist(faithful[, 2],
breaks = plot_params$bins,
main = plot_params$title,
col = 'darkgray',
border = 'white')
})
observeEvent(setup$modalApply,{
plot_params$bins = setup$bins
plot_params$title = setup$plotTitle
})
