我正在尝试使用R中的ShinySky软件包填充Shiny中的Typeahead盒子。
我试图扩展the example,其中用于预填充Typeahead的数据被硬编码到textInput.typeahead
函数中:
textInput.typeahead(
id="thti"
,placeholder="type 'name' or '2'"
,local=data.frame(name=c("name1","name2"),info=c("info1","info2")) #<- LOOK!
,valueKey = "name"
,tokens=c(1,2)
,template = HTML("<p class='repo-language'>{{info}}</p> <p class='repo-name'>{{name}}</p> <p class='repo-description'>You need to learn more CSS to customize this further</p>")
)
在函数中间定义了一个本地数据帧并不是我想做的,正如这里的例子所做的那样:
,local=data.frame(name=c("name1","name2"),info=c("info1","info2"))
我想向local
提供一个参数,它是一个反应对象,它是在Shiny的其他地方创建的。
到目前为止,我还是无法这样做。
这是我尝试使用反应性动态填充Lookhead选项的策略:
1)让用户使用滑块对数据帧进行子集化
2)设置Lookahead以使用类似,local=subset(DF)
的内容读入子集化数据帧
3)希望Lookahead的工作正常。
看起来够简单?这是一个屏幕截图,您可以清楚地看到Lookhead没有出现在111的用户输入下面。以下是我的代码。任何帮助将不胜感激。
library(shiny)
library(shinysky)
options(shiny.trace = F) # change to T for trace
DF <- data.frame(ID=c("111", "222", "333", "444"), info=c("info1", "info2", "info3", "info4"))
runApp(list(ui = pageWithSidebar(
headerPanel("This is a test"),
sidebarPanel(
helpText("I couldn't live without StackOverflow"),
sliderInput("range",
label = "Pick how many rows you want in your dataframe:",
min = 2, max = 4, value = 2, step=1),
helpText("After subsetting the dataframe using the controls above, can we make the Lookahead work?"),
textInput.typeahead(
id="thti"
,placeholder="type ID and info"
,local=subset(DF)
,valueKey = "ID"
,tokens=c(1,2)
,template = HTML("<p class='repo-language'>{{info}}</p> <p class='repo-name'>{{ID}}</p> <p class='repo-description'></p>"))
),
mainPanel(textOutput("text1"),
htmlOutput("text"),
tableOutput('table')
)
),
server = function(input, output, session) {
subsetDF <- reactive({ DF <- DF[1:input$range, ]
DF
})
output$text <- renderUI({
str <- paste("This is how many rows you've chosen for your dataframe:",
input$range)
HTML(paste(str, sep = '<br/>'))
})
output$table <- renderTable(subsetDF())
}
)
)