[英]How can I store a selectInput in a vector?
I'm trying to save a selectInput in a vector.我正在尝试将 selectInput 保存在向量中。
In my UI I've got:在我的用户界面中,我有:
selectInput("my_ID", "Search for a name", unique(datatable$names), "Henry")
In my server, I want to save this input in a variable to use it later.在我的服务器中,我想将此输入保存在一个变量中以供以后使用。
This is basically what I want:这基本上就是我想要的:
selectedNames <- input$my_ID
Of course, this does not work.当然,这行不通。 So I tried this:
所以我试过这个:
selectedNames <- reactive(input$my_ID)
But I get this warning again:但我再次收到此警告:
Error in .getReactiveEnvironment()$currentContext() : Operation not allowed without an active reactive context.
.getReactiveEnvironment()$currentContext() 中的错误:在没有活动反应上下文的情况下不允许操作。 (You tried to do something that can only be done from inside a reactive expression or observer.)
(你试图做一些只能从反应式表达式或观察者内部完成的事情。)
I have also tried to do it with an observer and different chunks of code I found on the internet, but nothing worked.我也尝试使用观察者和我在互联网上找到的不同代码块来完成它,但没有任何效果。
At the end, I want to use the selectedNames is a filter like this:最后,我想使用 selectedNames 是这样的过滤器:
example <- datatable %>% filter(names %in% selectedNames())
How can I fix this?我怎样才能解决这个问题?
Try selectedNames <- reactive({input$my_ID})
尝试
selectedNames <- reactive({input$my_ID})
Then use selectedNames()
in the rest of the app.然后在应用程序的其余部分使用
selectedNames()
。
See Reactivity - An overview .请参阅反应性 - 概述。
Update更新
Working Test Example:工作测试示例:
library(shiny)
datatable <- data.frame(names = c('Henry', 'Charles', 'Robert', 'William'))
ui <- fluidPage(
selectInput("my_ID", "Search for a name", unique(datatable$names), "Henry")
)
server <- function(input, output, session) {
selectedNames <- reactive({input$my_ID})
observeEvent(req(selectedNames()), {
example <- datatable %>% filter(names %in% selectedNames())
print(example)
})
}
shinyApp(ui, server)
You don't really need the reactive and could just use input$my_ID
directly, as below:你真的不需要反应式,可以直接使用
input$my_ID
,如下所示:
library(shiny)
datatable <- data.frame(names = c('Henry', 'Charles', 'Robert', 'William'))
ui <- fluidPage(
selectInput("my_ID", "Search for a name", unique(datatable$names), "Henry")
)
server <- function(input, output, session) {
observeEvent(req(input$my_ID), {
example <- datatable %>% filter(names %in% input$my_ID)
print(example)
})
}
shinyApp(ui, server)
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