updateSelectizeInput label is broken in shiny 1.2

[aslomko]

updateSelectizeInput changing the label does not work in shiny 1.2. Please see example:

#
# This is a Shiny web application. You can run the application by clicking
# the 'Run App' button above.
#
# Find out more about building applications with Shiny here:
#
#    http://shiny.rstudio.com/
#

library(shiny)

# Define UI for application that draws a histogram
ui <- fluidPage(
   useShinyjs(),
   # Application title
   titlePanel("Old Faithful Geyser Data"),
   # Sidebar with a slider input for number of bins 
   sidebarLayout(
      sidebarPanel(
         sliderInput("bins",
                     "Number of bins:",
                     min = 1,
                     max = 50,
                     value = 30),
         actionButton('testb','Button'),
         selectizeInput("test","Select",choices=c("Apple","Banana","Pineapple"),options=list(create=T))
      ),
      
      # Show a plot of the generated distribution
      mainPanel(
         plotOutput("distPlot")
      )
   )
)

# Define server logic required to draw a histogram
server <- function(input, output,session) {
  
  observeEvent(input$testb,{
    updateSelectizeInput(session,"test",label="SelectMore",choices=c("Pinecone","Mashmallow","Candy"))
  })
   
   output$distPlot <- renderPlot({
      # generate bins based on input$bins from ui.R
      x    <- faithful[, 2] 
      bins <- seq(min(x), max(x), length.out = input$bins + 1)
      
      # draw the histogram with the specified number of bins
      hist(x, breaks = bins, col = 'darkgray', border = 'white')
   })
}

# Run the application 
shinyApp(ui = ui, server = server)

[wch]

Simplified example:

library(shiny)

ui <- fluidPage(
  actionButton('testb','Button'),
  selectizeInput("test", "Original label", choices=c("Apple","Banana","Pineapple"))
)

server <- function(input, output,session) {
  observeEvent(input$testb,{
    updateSelectizeInput(session, "test", label="New label",
      choices = c("Pinecone","Mashmallow","Candy"))
  })
}

shinyApp(ui = ui, server = server)

It looks like the recent version of Selectize.js changes the for attribute to "test-selectized":

<label class="control-label" for="test-selectized">Original label</label>

See:
https://github.com/selectize/selectize.js/blob/5f3f3c1/src/selectize.js#L142-L145
selectize/selectize.js#755
selectize/selectize.js#1119