问题描述
我正在构建一个带有选择输入的闪亮应用。
输入中的选择取决于基础数据中的 id。
在我的真实应用中，数据通过调用 API 进行更新。
当我点击“更新数据”按钮时，我希望在 selectize 输入中选择的 id 选项保持不变。
在使用闪亮的模块之前，我能够做到这一点。但是，当我尝试将代码转换为使用闪亮的模块时，它无法保存选定的 id 值，并且每次更新基础数据时都会重置选择输入。
以下示例在没有模块的情况下很有帮助，但是当我使用该模块时，它似乎不起作用...link here
下面是一个reprex。感谢您的帮助。
library(shiny)
library(tidyverse)
# module UI
mymod_ui <- function(id){
ns <- NS(id)
tagList(
uIoUtput(ns("ids_lookup")),)
}
# module server
mymod_server <- function(input,output,session,data,actionb){
ns <-session$ns
ids <- reactive(
data() %>%
filter(!is.na(first_name) & !is.na(last_name) & !is.na(ages)) %>%
mutate(ids = paste(first_name,last_name,sep = " ")) %>%
select(ids)
)
output$ids_lookup <- renderUI({
selectizeInput(ns("lookup"),label = "Enter id:",choices = c("Type here ...",ids()),multiple = FALSE)
})
# here is where I would like to hold on to the selected ids when updating the table
# when I click the "reload_data" button I don't want the name to change
# I pass the button from the main server section into the module
current_id_selection <- reactiveVal("NULL")
observeEvent(actionb(),{
current_id_selection(ns(input$ids_lookup))
updateSelectizeInput(session,inputId = ns("lookup"),choices = ids(),selected = current_id_selection())
})
}
ui <- fluidPage(
titlePanel("Test module app"),br(),# this button reloads the data
actionButton(
inputId = "reload_data",label = "Reload data"
),# have a look at the data
h4("Raw data"),tableOutput("mytable"),# Now select a single id for further analysis in a much larger app
mymod_ui("mymod"),)
server <- function(input,session) {
df <- eventReactive(input$reload_data,{
# in reality,df is a dataframe which is updated from an API call everytime you press the action button
df <- tibble(
first_name = c("john","james","jenny","steph"),last_name = c("x","y","z",NA),ages = runif(4,30,60)
)
return(df)
}
)
output$mytable <- renderTable({
df()
})
# make the reload data button a reactive val that can be passed to the module for the selectize Input
mybutton <- reactive(input$reload_data)
callModule(mymod_server,"mymod",data = df,actionb = mybutton)
}
shinyApp(ui,server)
解决方法
只需在 inputId = "lookup" 中使用 inputId = ns("lookup") 而不是 updateSelectizeInput() 即可。此外，你还有另一个错字。试试这个
library(shiny)
library(tidyverse)
# module UI
mymod_ui <- function(id){
ns <- NS(id)
tagList(
uiOutput(ns("ids_lookup")),verbatimTextOutput(ns("t1"))
)
}
# module server
mymod_server <- function(input,output,session,data,actionb){
ns <-session$ns
ids <- reactive(
data() %>%
filter(!is.na(first_name) & !is.na(last_name) & !is.na(ages)) %>%
mutate(ids = paste(first_name,last_name,sep = " ")) %>%
select(ids)
)
output$ids_lookup <- renderUI({
selectizeInput(ns("lookup"),label = "Enter id:",choices = c("Type here ...",ids()),multiple = FALSE)
})
# here is where I would like to hold on to the selected ids when updating the table
# when I click the "reload_data" button I don't want the name to change
# I pass the button from the main server section into the module
current_id_selection <- reactiveValues(v=NULL)
observeEvent(actionb(),{
req(input$lookup)
current_id_selection$v <- input$lookup
output$t1 <- renderPrint(paste0("Current select is ",current_id_selection$v))
updateSelectizeInput(session,inputId = "lookup",choices = ids(),selected = current_id_selection$v )
})
}
ui <- fluidPage(
titlePanel("Test module app"),br(),# this button reloads the data
actionButton(inputId = "reload_data",label = "Reload data"
),# have a look at the data
h4("Raw data"),tableOutput("mytable"),# now select a single id for further analysis in a much larger app
mymod_ui("mymod")
)
server <- function(input,session) {
df <- eventReactive(input$reload_data,{
# in reality,df is a dataframe which is updated from an API call everytime you press the action button
df <- tibble(
first_name = c("john","james","jenny","steph"),last_name = c("x","y","z",NA),ages = runif(4,30,60)
)
return(df)
})
output$mytable <- renderTable({
df()
})
# make the reload data button a reactive val that can be passed to the module for the selectize Input
mybutton <- reactive(input$reload_data)
callModule(mymod_server,"mymod",data = df,actionb = mybutton)
}
shinyApp(ui,server)
