[英]Producing dynamic/multiple input boxes to collect data depending on user selection in Shiny R
I am trying to build an app in Shiny that (1) asks user for number of Assets in his/her portfolio. 我正在尝试在Shiny中构建一个应用程序,该应用程序(1)要求用户提供其投资组合中的资产数量。 Depending on the numeric entry, (2) the user is presented with one numeric box to enter the % of portfolio owned AND the Ticker/name of the Asset.
根据数字输入,(2)将为用户显示一个数字框,以输入所拥有投资组合的百分比和资产的股票行情代码/名称。 For instance, If the user enters 3 for number of assets in portfolio, he will be presented with something like this:
例如,如果用户输入3作为投资组合中资产的数量,将向他显示以下内容:
Asset1 ----> Enter ticker______ Enter Wight______ 资产1 ---->输入代码______输入权重______
Asset2 ----> Enter ticker______ Enter Wight______ 资产2 ---->输入代码______输入权重______
Asset3 ----> Enter ticker______ Enter Wight______ Asset3 ---->输入代码______输入权重______
This is suppose to be dynamic so the greater the number of assets, the greater the input fields. 假定这是动态的,因此资产数量越多,输入字段就越大。 Finally, in step (3), I want to save the entered information for each Asset in a table and display the table.
最后,在步骤(3)中,我想将每个资产的输入信息保存在表中并显示该表。
Here is what I have got and it is no where near what I need it to be. 这就是我所拥有的,而且离我需要的东西也不远。 I am totally new to Shiny and that is half the reason for my troubles:
我对Shiny完全陌生,这是造成麻烦的一半:
UI.R 用户界面
shinyUI(pageWithSidebar (
headerPanel( "Portfolio Returns"),
sidebarPanel(
numericInput("assets", label = "Enter Total Assets", value="")
),
mainPanel(
tableOutput("table"))
)
)
server.R 服务器
shinyServer(
function(input,output) {
output$DynamicAssets <- renderUI ({
Assets <- as.integer(input$assets)
for(i in 1:Assets,function(i) {
"ticker" = textInput("Ticker", label="Enter Ticker", value="Enter Ticker"),
"weight" = numericInput ("AssetWeight", label="weights of Assets", value="")
})
})
})
})
I know the code is in complete because i have no idea what to do next. 我知道代码已经完成,因为我不知道下一步该怎么做。 this is all that i figured out from seraching the net.
这就是我从搜索网络中发现的所有内容。 Your help would be greatly appreciated.
您的帮助将不胜感激。
ui.R 用户界面
library(shiny)
shinyUI(pageWithSidebar (
headerPanel( "Portfolio Returns"),
sidebarPanel(
numericInput("assets", label = "Enter Number of Assets in Portfolio", value="1"),
uiOutput("tickers")
),
mainPanel()
))
server.R 服务器
-Note that to pass multiple items in the renderUI()
function you have to group them into a list, and here lapply()
is creating a list of lists. -请注意,要在
renderUI()
函数中传递多个项目,您必须将它们分组为一个列表,在这里lapply()
正在创建一个列表列表。
library(shiny)
shinyServer( function(input, output, session) {
output$tickers <- renderUI({
numAssets <- as.integer(input$assets)
lapply(1:numAssets, function(i) {
list(tags$p(tags$u(h4(paste0("Asset ", i)))),
textInput(paste0("ticker", i), label = "Ticker Name", value = "Enter ticker..."),
numericInput(paste0("weight", i), label = "Weight of Asset", value=0))
})
})
})
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