本文介绍了闪亮的保存URL状态子页和选项卡的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我希望有一个闪亮的网站，将URL中的动态选择作为输出，这样您就可以复制和共享URL。我以此代码为例：https://gist.github.com/amackey/6841cf03e54d021175f0
并将其修改为我的案例，这是一个具有navbarPage和栏中每个元素多个选项卡的网页。
#beverage=Tea;milk=TRUE;sugarLumps=3;customer=mycustomer，我会例如，将用户发送到"Delta Foxtrot"->"Hotel"的URL从第一个面板元素的第一个选项卡开始。理想情况下，我希望有一个有效的示例，因为到目前为止，我尝试的所有方法都不起作用。
有什么想法吗？
# ui.R
library(shiny)
hashProxy <- function(inputoutputID) {
div(id=inputoutputID,class=inputoutputID,tag("div",""));
}
# Define UI for shiny d3 chatter application
shinyUI(navbarPage('URLtests', id="page", collapsable=TRUE, inverse=FALSE,
tabPanel("Alfa Bravo",
tabsetPanel(
tabPanel("Charlie",
tags$p("Nothing to see here. Everything is in the 'Delta Foxtrot' 'Hotel' tab")
)
)
)
,tabPanel("Delta Foxtrot",
tabsetPanel(
tabPanel("Golf",
tags$p("Nothing to see here. Everything is in the 'Delta Foxtrot' 'Hotel' tab")
)
,tabPanel("Hotel",
tags$p("This widget is a demonstration of how to preserve input state across sessions, using the URL hash."),
selectInput("beverage", "Choose a beverage:",
choices = c("Tea", "Coffee", "Cocoa")),
checkboxInput("milk", "Milk"),
sliderInput("sugarLumps", "Sugar Lumps:",
min=0, max=10, value=3),
textInput("customer", "Your Name:"),
includeHTML("URL.js"),
h3(textOutput("order")),
hashProxy("hash")
)
)
)
))
# server.R
library(shiny)
url_fields_to_sync <- c("beverage","milk","sugarLumps","customer");
# Define server logic required to respond to d3 requests
shinyServer(function(input, output, clientData) {
# Generate a plot of the requested variable against mpg and only
# include outliers if requested
output$order <- reactiveText(function() {
paste(input$beverage,
if(input$milk) "with milk" else ", black",
"and",
if (input$sugarLumps == 0) "no" else input$sugarLumps,
"sugar lumps",
"for",
if (input$customer == "") "next customer" else input$customer)
})
firstTime <- TRUE
output$hash <- reactiveText(function() {
newHash = paste(collapse=";",
Map(function(field) {
paste(sep="=",
field,
input[[field]])
},
url_fields_to_sync))
# the VERY FIRST time we pass the input hash up.
return(
if (!firstTime) {
newHash
} else {
if (is.null(input$hash)) {
NULL
} else {
firstTime<<-F;
isolate(input$hash)
}
}
)
})
})
# URL.js
<script type="text/javascript">
(function(){
this.countValue=0;
var changeInputsFromHash = function(newHash) {
// get hash OUTPUT
var hashVal = $(newHash).data().shinyInputBinding.getValue($(newHash))
if (hashVal == "") return
// get values encoded in hash
var keyVals = hashVal.substring(1).split(";").map(function(x){return x.split("=")})
// find input bindings corresponding to them
keyVals.map(function(x) {
var el=$("#"+x[0])
if (el.length > 0 && el.val() != x[1]) {
console.log("Attempting to update input " + x[0] + " with value " + x[1]);
if (el.attr("type") == "checkbox") {
el.prop('checked',x[1]=="TRUE")
el.change()
} else if(el.attr("type") == "radio") {
console.log("I don't know how to update radios")
} else if(el.attr("type") == "slider") {
// This case should be setValue but it's not implemented in shiny
el.slider("value",x[1])
//el.change()
} else {
el.data().shinyInputBinding.setValue(el[0],x[1])
el.change()
}
}
})
}
var HashOutputBinding = new Shiny.OutputBinding();
$.extend(HashOutputBinding, {
find: function(scope) {
return $(scope).find(".hash");
},
renderError: function(el,error) {
console.log("Shiny app failed to calculate new hash");
},
renderValue: function(el,data) {
console.log("Updated hash");
document.location.hash=data;
changeInputsFromHash(el);
}
});
Shiny.outputBindings.register(HashOutputBinding);
var HashInputBinding = new Shiny.InputBinding();
$.extend(HashInputBinding, {
find: function(scope) {
return $(scope).find(".hash");
},
getValue: function(el) {
return document.location.hash;
},
subscribe: function(el, callback) {
window.addEventListener("hashchange",
function(e) {
changeInputsFromHash(el);
callback();
}
, false);
}
});
Shiny.inputBindings.register(HashInputBinding);
})()
</script>
编辑：我运行了答案中的示例代码，但无法使其工作。请参见屏幕截图。
推荐答案
更新
现已在cran上提供的.14支持将应用程序状态保存在URL中。请参见this article这个答案比我的第一个答案更深入，我的第一个答案使用了OP提供的整个示例代码。鉴于赏金之高，我决定将其添加为新的答案。我最初的答案使用了这个的简化版本，这样其他得到答案的人就不需要阅读任何无关的代码来找到他们正在寻找的东西。希望这个扩展版本能解决您遇到的任何困难。我添加到您的R代码的部分用### ... ###括起来。
服务器。r
# server.R
library(shiny)
url_fields_to_sync <- c("beverage","milk","sugarLumps","customer");
# Define server logic required to respond to d3 requests
shinyServer(function(input, output, session) { # session is the common name for this variable, not clientData
# Generate a plot of the requested variable against mpg and only
# include outliers if requested
output$order <- reactiveText(function() {
paste(input$beverage,
if(input$milk) "with milk" else ", black",
"and",
if (input$sugarLumps == 0) "no" else input$sugarLumps,
"sugar lumps",
"for",
if (input$customer == "") "next customer" else input$customer)
})
firstTime <- TRUE
output$hash <- reactiveText(function() {
newHash = paste(collapse=";",
Map(function(field) {
paste(sep="=",
field,
input[[field]])
},
url_fields_to_sync))
# the VERY FIRST time we pass the input hash up.
return(
if (!firstTime) {
newHash
} else {
if (is.null(input$hash)) {
NULL
} else {
firstTime<<-F;
isolate(input$hash)
}
}
)
})
###
# whenever your input values change, including the navbar and tabpanels, send
# a message to the client to update the URL with the input variables.
# setURL is defined in url_handler.js
observe({
reactlist <- reactiveValuesToList(input)
reactvals <- grep("^ss-|^shiny-", names(reactlist), value=TRUE, invert=TRUE) # strip shiny related URL parameters
reactstr <- lapply(reactlist[reactvals], as.character) # handle conversion of special data types
session$sendCustomMessage(type='setURL', reactstr)
})
observe({ # this observer executes once, when the page loads
# data is a list when an entry for each variable specified
# in the URL. We'll assume the possibility of the following
# variables, which may or may not be present:
# nav= The navbar tab desired (either Alfa Bravo or Delta Foxtrot)
# tab= The desired tab within the specified nav bar tab, e.g., Golf or Hotel
# beverage= The desired beverage selection
# sugar= The desired number of sugar lumps
#
# If any of these variables aren't specified, they won't be used, and
# the tabs and inputs will remain at their default value.
data <- parseQueryString(session$clientData$url_search)
# the navbar tab and tabpanel variables are two variables
# we have to pass to the client for the update to take place
# if nav is defined, send a message to the client to set the nav tab
if (! is.null(data$page)) {
session$sendCustomMessage(type='setNavbar', data)
}
# if the tab variable is defined, send a message to client to update the tab
if (any(sapply(data[c('alfa_bravo_tabs', 'delta_foxtrot_tabs')], Negate(is.null)))) {
session$sendCustomMessage(type='setTab', data)
}
# the rest of the variables can be set with shiny's update* methods
if (! is.null(data$beverage)) { # if a variable isn't specified, it will be NULL
updateSelectInput(session, 'beverage', selected=data$beverage)
}
if (! is.null(data$sugarLumps)) {
sugar <- as.numeric(data$sugarLumps) # variables come in as character, update to numeric
updateNumericInput(session, 'sugarLumps', value=sugar)
}
})
###
})
ui.r
library(shiny)
hashProxy <- function(inputoutputID) {
div(id=inputoutputID,class=inputoutputID,tag("div",""));
}
# Define UI for shiny d3 chatter application
shinyUI(navbarPage('URLtests', id="page", collapsable=TRUE, inverse=FALSE,
tabPanel("Alfa Bravo",
tabsetPanel(
###
id='alfa_bravo_tabs', # you need to set an ID for your tabpanels
###
tabPanel("Charlie",
tags$p("Nothing to see here. Everything is in the 'Delta Foxtrot' 'Hotel' tab")
)
)
)
,tabPanel("Delta Foxtrot",
tabsetPanel(
###
id='delta_foxtrot_tabs', # you need to set an ID for your tabpanels
###
tabPanel("Golf",
tags$p("Nothing to see here. Everything is in the 'Delta Foxtrot' 'Hotel' tab")
)
,tabPanel("Hotel", id='hotel',
tags$p("This widget is a demonstration of how to preserve input state across sessions, using the URL hash."),
selectInput("beverage", "Choose a beverage:",
choices = c("Tea", "Coffee", "Cocoa")),
checkboxInput("milk", "Milk"),
sliderInput("sugarLumps", "Sugar Lumps:",
min=0, max=10, value=3),
textInput("customer", "Your Name:"),
#includeHTML("URL.js"),
###
includeHTML('url_handler.js'), # include the new script
###
h3(textOutput("order")),
hashProxy("hash")
)
)
)
))
url_handler.js
<script>
Shiny.addCustomMessageHandler('setNavbar',
function(data) {
// create a reference to the desired navbar tab. page is the
// id of the navbarPage. a:contains says look for
// the subelement that contains the contents of data.nav
var nav_ref = '#page a:contains("' + data.page + '")';
$(nav_ref).tab('show');
}
)
Shiny.addCustomMessageHandler('setTab',
function(data) {
// pick the right tabpanel ID based on the value of data.nav
if (data.page == 'Alfa Bravo') {
var tabpanel_id = 'alfa_bravo_tabs';
} else {
var tabpanel_id = 'delta_foxtrot_tabs';
}
// combine this with a reference to the desired tab itself.
var tab_ref = '#' + tabpanel_id + ' a:contains("' + data[tabpanel_id] + '")';
$(tab_ref).tab('show');
}
)
Shiny.addCustomMessageHandler('setURL',
function(data) {
// make each key and value URL safe (replacing spaces, etc.), then join
// them and put them in the URL
var search_terms = [];
for (var key in data) {
search_terms.push(encodeURIComponent(key) + '=' + encodeURIComponent(data[key]));
}
window.history.pushState('object or string', 'Title', '/?' + search_terms.join('&'));
}
);
</script>
要测试这一点，请调用包含源文件的目录中的runApp(port=5678)。默认情况下，URL中未指定任何参数，因此将默认为第一个导航栏项目和该项目中的第一个选项卡。要使用URL参数对其进行测试，请将浏览器指向：http://127.0.0.1:5678/?nav=Delta%20Foxtrot&tab=Hotel&beverage=Coffee。这应该会将您指向第二个导航栏选项卡和该导航栏项目中的第二个选项卡，并将咖啡作为所选饮料。
这篇关于闪亮的保存URL状态子页和选项卡的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！