[英]Capture selectize Input value in R shiny module
我正在構建一個帶有選擇輸入的 shiny 應用程序。
輸入中的選擇取決於基礎數據中的 id。
在我的真實應用程序中,數據通過調用 API 進行更新。
當我點擊“更新數據”按鈕時,我希望選擇輸入中的選定 id 選項保持不變。
在使用 shiny 模塊之前,我能夠做到這一點。 但是,當我嘗試將代碼轉換為使用 shiny 模塊時,它無法保存選定的 id 值,並且每次更新基礎數據時都會重置選擇輸入。
以下示例在沒有模塊的情況下很有幫助,但是當我使用該模塊時,它似乎不起作用...... 鏈接在這里
下面是一個代表。 謝謝你的幫助。
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$ids_lookup))
updateSelectizeInput(session,
inputId = ns("lookup"),
choices = ids(),
selected = current_id_selection())
})
}
ui <- fluidPage(
titlePanel("Test module app"),
br(),
# this button reloads the data
actionButton(
inputId = "reload_data",
label = "Reload data"
),
br(),
br(),
# have a look at the data
h4("Raw data"),
tableOutput("mytable"),
br(),
# now select a single id for further analysis in a much larger app
mymod_ui("mymod"),
)
server <- function(input, output, session) {
df <- eventReactive(input$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)
只需在updateSelectizeInput()
中使用inputId = "lookup"
而不是inputId = ns("lookup")
。 另外,您那里還有另一個錯字。 嘗試這個
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"
),
br(),
br(),
# have a look at the data
h4("Raw data"),
tableOutput("mytable"),
br(),
# now select a single id for further analysis in a much larger app
mymod_ui("mymod")
)
server <- function(input, output, 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)
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