【发布时间】：2018-09-06 00:04:12
【问题描述】：
感谢这里的几个主题，我已经开始创建一个小程序，但是我有一些小问题： 在“第 1 页”选项卡上，当我单击“add_btn”操作按钮时，会出现一个框，允许记录一个新人。但是当所有输入为空时，我想隐藏操作按钮“add_btn”。你可以看到我尝试用shinyjs 只输入一个输入：input$fname_1，但按钮仍然显示。 其次，在创建的名为“persons”的数据表中，我没有成功带回第一个变量“value_i”中的计数器值。
拜托，你能告诉我我的程序有什么问题吗？
非常感谢。
界面：
library(shiny)
library(shinydashboard)
library(shinyBS)
library(shinyjs)
ui <- dashboardPage(
dashboardHeader(
title = "Test",
titleWidth = 500),
dashboardSidebar(
sidebarMenu(id = "Menu1",
sidebarMenuOutput("Menu"))),
dashboardBody(
shinyjs::useShinyjs(), # required to enable Shinyjs
tabItems(
tabItem(tabName = "HF_Page1",
box(title = "A. People who live in the house", width = NULL, solidHeader = TRUE, status = "primary",
uiOutput("HF_Page1"),
actionButton("add_btn", "Add a person"),
actionButton("rm_btn", "Remove last person"),
textOutput("counter"))),
tabItem(tabName = "HF_Page2",
box(title = "B. Responses", width = NULL, solidHeader = TRUE, status = "primary",
DT::dataTableOutput("persons", width = 300), tags$hr()))
) # tabItems
) # dashboardBody
) # dashboardPage
和服务器：
fields <- c("value_i", "fname_1", "lname_1", "sex1", "birth_year1", "spouse1", "mother1", "father1", "time1_1", "time1_2")
# Save a response
saveData <- function(data) {
data <- as.data.frame(t(data))
if (exists("persons")) {
persons <<- rbind(persons, data)
} else {
persons <<- data
}
}
loadData <- function() {
if (exists("persons")) {
persons
}
}
server <- shinyServer(function(input, output, session) {
session$onSessionEnded(stopApp)
output$Menu <- renderMenu({
sidebarMenu(
menuItem(strong("House Form"), tabName = "HF", icon = icon("home"), selected = TRUE),
menuSubItem("Page 1", tabName = "HF_Page1"),
menuSubItem("Page 2", tabName = "HF_Page2"),
menuSubItem("Page 3", tabName = "HF_Page3"),
menuItem(strong("Individual Form"), tabName = "IF", icon = icon("user")),
menuSubItem("Page 1", tabName = "IF_Page1"),
menuSubItem("Page 2", tabName = "IF_Page2"),
menuItem(strong("Close application"), tabName = "Close", icon = icon("remove"))
) # sidebarMenu
}) # renderMenu
# Track the number of each person
counter <- reactiveValues(n = 0)
#observeEvent(input$add_btn, {
# counter$n <- counter$n + 1
# saveData(formData())
#})
observeEvent(input$rm_btn, {
if (counter$n > 0)
counter$n <- counter$n - 1
})
# Print counter value
output$counter <- renderPrint(print(counter$n))
# render a number of topic ui elements based on the counter
topics <- reactive({
n <- counter$n
if (n > 0)
lapply(seq_len(n), topic_ui)
})
observeEvent(input$add_btn,{
observe(
if(is.null(input$fname_1) || input$fname_1 == "" || is.null(input$lname_1) || input$lname_1 == "" || is.null(input$birth_year1) || input$birth_year1 == ""){
disable("add_btn")
}
else{
enable("add_btn")
}
)
counter$n <- counter$n + 1
saveData(formData())
})
# Rendering the UI
output$HF_Page1 <- renderUI(topics())
# Whenever a field is filled, aggregate all form data
formData <- reactive({
data <- sapply(fields, function(x) input[[x]])
data
})
# When the Add button is clicked, save the form data
#observeEvent(input$add_btn, {
# saveData(formData())
#})
# Show the previous responses
# (update with current response when Submit is clicked)
output$persons <- DT::renderDataTable({
input$add_btn
loadData()
})
# Render table of people recorded
output$HF_Page2 <- renderUI(
DT::dataTableOutput("persons", width = 300), tags$hr())
})
topic_ui <- function(i) {
box(title = paste("Person", i), width = NULL, solidHeader = FALSE, status = "primary",
column(width = 6,
div(style = "display:inline-block", print(h3(i))),
div(style = "display:inline-block", textInput("fname_1", "First name", value = "", width = '250px')),
div(style = "display:inline-block", textInput("lname_1", "Last name", value = "", width = '250px')),
div(style = "display:inline-block", selectInput("sex1", "Sex", choices = list("M" = "1", "F" = "2"),
selected = "", width = '55px')),
div(style = "display:inline-block", textInput("birth_year1", "Birth year", value = "", width = '125px'))),
column(width = 4,
div(style = "display:inline-block", textInput("spouse1", "Spouse's line number", value = "", width = '150px')),
div(style = "display:inline-block", textInput("mother1", "Mother's line number", value = "", width = '150px')),
div(style = "display:inline-block", textInput("father1", "Father's line number", value = "", width = '150px'))),
column(width = 2,
checkboxInput("time1_1", label = "Half time", FALSE),
bsTooltip("time1_1",
"Test Tooltip1"), placement = "bottom", trigger = "hover",
checkboxInput("time1_2", label = "More than half time", FALSE),
bsTooltip("time1_2",
"Test Tooltip2"), placement = "bottom", trigger = "hover")
) # box
}
【问题讨论】：