自动完成和选择文本框中的多个值

Question

是否可以使用自动完成字符串来选择多个值，类似于google和堆栈溢出标签在闪亮文本框中的选择。

dataset<-cbind("John Doe","Ash","Ajay sharma","Ken Chong","Will Smith","Neo"....etc)

我想从上面的数据集中选择多个变量作为自动填充我的文本框，并将它传递给我的服务器。

ui.R

shinyUI(fluidPage(
  titlePanel("test"),

  sidebarLayout(
    sidebarPanel(
      helpText("text"),

      textInput("txt","Enter the text",""),
      #Pass the dataset here for auto complete

     ),

    mainPanel(
      tabsetPanel(type="tab",tabPanel("Summary"),textOutput("text2"))

    )
  )
))

server.R

# server.R

shinyServer(function(input, output) {

output$text2<- renderText({
paste("hello",input$txt)

 })


}
)

编辑

我使用了来自shinysky的select2input来选择多个变量，但现在我添加了submit按钮来将选定的值放在一起。

#ui.R
select2Input("txt","This is a multiple select2Input",choices=c("a","b","c"),selected=c("")),

actionButton("go","submit") 

我想绑定选中的选项，假设用户选择了a和c，那么新变量是

#server.R
input$go #if pressed submit button
var<-cbind("a","c")
output$text<-renderText({ print ("var")})

但这不起作用

Answer 1

查看shinysky包和textInput.typeahead。您可以自己进一步自定义textinput的样式。编辑：--我从shinysky包中添加了select2Input示例，以供参考

rm(list = ls())

library(shinysky)
library(shiny)

my_autocomplete_list <- c("John Doe","Ash","Ajay sharma","Ken Chong","Will Smith","Neo")

ui <- shinyUI(
  fluidPage(tags$style(type="text/css",".shiny-output-error { visibility: hidden; }",".shiny-output-error:before { visibility: hidden; }"),
            tags$style(type="text/css","#search { top: 50% !important;left: 50% !important;margin-top: -100px !important;margin-left: -250px 
                       !important; color: blue;font-size: 20px;font-style: italic;}"),         

            mainPanel(  
              # one way of doing it
              textInput.typeahead(id="search",
                                  placeholder="Type your name please",
                                  local=data.frame(name=c(my_autocomplete_list)),
                                  valueKey = "name",
                                  tokens=c(1:length(my_autocomplete_list)),
                                  template = HTML("<p class='repo-language'>{{info}}</p> <p class='repo-name'>{{name}}</p>")
              ),
              br(),br(),
              # using select2Input
              select2Input("select2Input1","",choices=c(my_autocomplete_list),type = c("input", "select"))
              )
  )
)

server <- function(input, output, session) {}
shinyApp(ui = ui, server = server)

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编辑2根据请求。请像我一样将对象封装在reactive表达式中，例如var <- reactive({...})，以便以后可以重用这些表达式。

rm(list = ls())

library(shinysky)
library(shiny)

my_autocomplete_list <- c("John Doe","Ash","Ajay sharma","Ken Chong","Will Smith","Neo")

ui <- shinyUI(
  fluidPage(sidebarPanel(select2Input("txt","",choices=c("a","b","c"),selected=c("")), br(),actionButton("go","submit"), width =2),
            mainPanel(textOutput('text'))
  )
)

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

  var <- reactive({
    if(input$go==0){return()}
    isolate({
      input$go
      cbind("a","c")
    })
  })  
  output$text <- renderText({var()})
}
shinyApp(ui = ui, server = server)

Answer 2

imho的一种更简单的方法是使用shiny::selectizeInput()。它允许您通过选择参数自动完成输入。

rm(list = ls())

library(shiny)

my_autocomplete_list <- c("John Doe","Ash","Ajay sharma",
                          "Ken Chong","Will Smith","Neo")

ui <- shinyUI(
  selectizeInput(
    inputId = 'search',
    label = 'Search',
    choices = my_autocomplete_list,
    selected = NULL,
    multiple = TRUE, # allow for multiple inputs
    options = list(create = FALSE) # if TRUE, allows newly created inputs
  )
)

server <- function(input, output, session) {}
shinyApp(ui = ui, server = server)