I know there is this server side method called renderUI, but it makes updating the UI extremely slow in some cases, so I am now relying on the JavaScript.
My problem is a follows. I would like to update the title attribute of material_card from shinymaterial package. I would like to see the title to change, every time I select an alternative from a separate dropdown menu.
So far my list of UI components contain tags$script() object, which is supposed to observe the changes in the selectInput (goes with id "dropdown").
My code looks as follows:
library(shinymaterial)
library(shiny)
ui <- material_page(
titlePanel("Soon to be working JavaScript example!"),
sidebarLayout(
sidebarPanel(
selectInput(
"dropdown",
"Dropdown menu",
c('Hat','Shoes','Jacket')),
tags$script('
$(document).on("shiny:inputchanged", function(event) {
if (event.name === "dropdown") {
if(input.dropdown === "Jacket") {
//Even this alert is not working, possibly because input.name is not recognized. :(
alert("You chose Jacket, now the material card title will be changed to: Jacket selected");
//What am I supposed to put here to update the material_card title?
} else {
//...and here as well...
}
});'
),
material_card(
depth=5,
title = 'This value needs to be changed according what was chosen in the dropdown menu!')
),
mainPanel(
h5('Nothing here!')
)
)
)
server <- function(input, output) {
#The server is empty, as it should. :)
}
shinyApp(ui = ui, server = server)
I managed to get the alert working without the if(input.dropdown === "Jacket") validation, but this validation is not working: Most likely input.dropdown is not even recognized, although it works nicely with conditional panel.
Furthermore, I am even more lost with the logic: How should I actually use JavaScript to update the material_card title, after the change in selectInput (dropdown) value has been observed?
A shiny UI-only solution:
library(shinymaterial)
library(shiny)
dropdownChoices <- c('Hat','Shoes','Jacket')
ui <- material_page(
titlePanel("Soon to be working JavaScript example!"),
sidebarLayout(
sidebarPanel(
selectInput(
"dropdown",
"Dropdown menu",
dropdownChoices),
material_card(
depth = 5,
title = lapply(dropdownChoices, function(i){
conditionalPanel(sprintf('input.dropdown == "%s"', i), i)
})
)),
mainPanel(
h5('Nothing here!')
)
)
)
server <- function(input, output) {}
shinyApp(ui = ui, server = server)
library(shinymaterial)
library(shiny)
ui <- material_page(
titlePanel("Soon to be working JavaScript example!"),
sidebarLayout(
sidebarPanel(
selectInput(
"dropdown",
"Dropdown menu",
c('Hat','Shoes','Jacket')),
tags$script(HTML('
$(document).on("shiny:inputchanged", function(event) {
if (event.name === "dropdown") {
if(event.value === "Jacket") {
alert("You chose Jacket, now the material card title will be changed to: Jacket selected");
$("#mycard>span.card-title").html("Here is the new card title");
} else {
//...and here as well...
}
}
});')
),
material_card(
depth=5,
title = 'This value needs to be changed according what was chosen in the dropdown menu!',
id = "mycard"
)
),
mainPanel(
h5('Nothing here!')
)
)
)
shinyApp(ui, server = function(input,output){})