I would like to have a shiny website that keeps the dynamic choices in the URL as output, so you can copy and share the URL. I took this code as an example: https://gist.github.com/amackey/6841cf03e54d021175f0
And modified it to my case, which is a webpage with a navbarPage and multiple tabs per element in the bar.
What I would like is the URL to direct the user to the right element in the first level tabPanel, and the right tab in the second level tabPanel.
This is, if the user has navigated to "Delta Foxtrot" and then to
"Hotel", then changed the parameters to
#beverage=Tea;milk=TRUE;sugarLumps=3;customer=mycustomer, I would
like the URL to send the user to "Delta Foxtrot" -> "Hotel", instead
of starting at the first tab of the first panel element.
Ideally I would like a working example, since everything I tried so far hasn't worked.
Any ideas?
# 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>
EDITED: I ran the example code in the answer, but couldn't get it to work. See screenshot.
