选择多个输入时的动态/条件筛选（selectizeInput，multiple=TRUE）

如果multiple=TRUE，在输入selectizeInput中使用动态/条件过滤的正确方法是什么

在本例中，我试图显示受祖父母过滤器限制的父过滤器any、all、none，然后显示受父过滤器限制的子过滤器

.getReactiveEnvironment$currentContext中出错：如果没有活动-反应上下文，则不允许操作。您试图做的事情只能从被动表达式或观察者内部完成

更新

以下是@heds1中解决方案的flexdashboard版本：

---
title: "Example"
runtime: shiny
output:
  flexdashboard::flex_dashboard:
  vertical_layout: fill
---


```{r}
library(tidyverse)
library(flexdashboard)
library(shinyWidgets)
```

```{r global, include=FALSE}
filter_df <- data.frame(filter_GP = c("gpA", "gpA", "gpA", "gpB", "gpB", "gpB"),
                        filter_P = c("p1", "p1", "p2", "p3", "p4", "p4"),
                        filter_C = c("g", "h", "i", "j", "k", "l"))

data_df <- data.frame(y = seq(from=1, to=12),
                      filter_C = c("g", "g", "h", "h", "i", "i", "j", "j", "k", "k", "l", "l"))

data_df <- 
data_df %>%
  left_join(filter_df, by="filter_C")
```


Sidebar {.sidebar}
=====================================

```{r}
# grandparents
  selectizeInput("GP", label = "Grandparents (multi-select):", 
                 choices = unique(filter_df$filter_GP), 
                 multiple = TRUE,
                 selected = "")

# parents
  output$P <- renderUI({
        df <- data_df[data_df$filter_GP %in% input$GP, ]
        selectizeInput(
                    'P', 'Parents', choices = unique(df$filter_P), multiple = TRUE
                )
    })

  uiOutput("P")

# children
  output$C <- renderUI({
        df <- data_df[data_df$filter_GP %in% input$GP, ]
        df <- df[df$filter_P %in% input$P, ]
        selectizeInput(
                    'C', 'Children', choices = unique(df$filter_C), multiple = TRUE
                )
    })

  uiOutput("C")
```



Test 
=====================================

您可以使用uiOutput和selectizeInput来实现这一点。我不知道flexdashboard和ShinyWidget，但使用shiny本身，您可以这样做：

library(shiny)
library(tidyverse)

filter_df <- data.frame(filter_GP = c("gpA", "gpA", "gpA", "gpB", "gpB", "gpB"),
                        filter_P = c("p1", "p1", "p2", "p3", "p4", "p4"),
                        filter_C = c("g", "h", "i", "j", "k", "l"))

data_df <- data.frame(y = seq(from=1, to=12),
                      filter_C = c("g", "g", "h", "h", "i", "i", "j", "j", "k", "k", "l", "l"))

data_df <- 
data_df %>%
  left_join(filter_df, by="filter_C")

ui <- {
    fluidPage(
        # grandparents
        selectizeInput("GP", label = "Grandparents (multi-select):", 
                            choices = unique(filter_df$filter_GP), 
                            multiple = TRUE,
                            selected = ""),
        uiOutput("P"),
        uiOutput("C")
    )
}

server <- function(input, output, session) {

    output$P <- renderUI({
        df <- data_df[data_df$filter_GP %in% input$GP, ]
        selectizeInput(
                    'P', 'Parents', choices = unique(df$filter_P), multiple = TRUE
                )
    })

    output$C <- renderUI({
        df <- data_df[data_df$filter_GP %in% input$GP, ]
        df <- df[df$filter_P %in% input$P, ]
        selectizeInput(
                    'C', 'Children', choices = unique(df$filter_C), multiple = TRUE
                )
    })
}

shinyApp(ui, server)

---

太好了，@heds1！我在原始问题中添加了flexdashboard版本的解决方案。

library(shiny)
library(tidyverse)

filter_df <- data.frame(filter_GP = c("gpA", "gpA", "gpA", "gpB", "gpB", "gpB"),
                        filter_P = c("p1", "p1", "p2", "p3", "p4", "p4"),
                        filter_C = c("g", "h", "i", "j", "k", "l"))

data_df <- data.frame(y = seq(from=1, to=12),
                      filter_C = c("g", "g", "h", "h", "i", "i", "j", "j", "k", "k", "l", "l"))

data_df <- 
data_df %>%
  left_join(filter_df, by="filter_C")

ui <- {
    fluidPage(
        # grandparents
        selectizeInput("GP", label = "Grandparents (multi-select):", 
                            choices = unique(filter_df$filter_GP), 
                            multiple = TRUE,
                            selected = ""),
        uiOutput("P"),
        uiOutput("C")
    )
}

server <- function(input, output, session) {

    output$P <- renderUI({
        df <- data_df[data_df$filter_GP %in% input$GP, ]
        selectizeInput(
                    'P', 'Parents', choices = unique(df$filter_P), multiple = TRUE
                )
    })

    output$C <- renderUI({
        df <- data_df[data_df$filter_GP %in% input$GP, ]
        df <- df[df$filter_P %in% input$P, ]
        selectizeInput(
                    'C', 'Children', choices = unique(df$filter_C), multiple = TRUE
                )
    })
}

shinyApp(ui, server)