Multi-Select Filter with glasstabs

Overview

glassMultiSelect() is a standalone animated dropdown filter for Shiny. It can be used inside a glassTabsUI() layout or completely on its own in any Shiny page.

Basic usage

library(shiny)
library(glasstabs)

fruits <- c(Apple = "apple", Banana = "banana", Cherry = "cherry",
            Mango  = "mango", Peach  = "peach")

ui <- fluidPage(
  useGlassTabs(),
  glassMultiSelect("pick", fruits),
  verbatimTextOutput("out")
)

server <- function(input, output, session) {
  output$out <- renderPrint(input$pick)
}

shinyApp(ui, server)

Shiny inputs produced

Input	Type	Value
`input$<inputId>`	character vector	Currently selected values
`input$<inputId>_style`	character	Active checkbox style

Initial selection

# All selected (default)
glassMultiSelect("f", fruits)

# Subset pre-selected
glassMultiSelect("f", fruits, selected = c("apple", "cherry"))

# Nothing pre-selected
glassMultiSelect("f", fruits, selected = character(0))

Checkbox styles

Three indicator styles are available via check_style:

# Bordered box + animated tick (default)
glassMultiSelect("f", fruits, check_style = "checkbox")

# Tick only — minimal, no box border
glassMultiSelect("f", fruits, check_style = "check-only")

# Solid coloured box — each option gets its own hue
glassMultiSelect("f", fruits, check_style = "filled")

By default, a style switcher row is shown inside the dropdown so the user can change the style at runtime. Hide it with show_style_switcher = FALSE:

glassMultiSelect("f", fruits,
  check_style         = "check-only",
  show_style_switcher = FALSE          # lock the style silently
)

Custom hues for the filled style

When check_style = "filled", hues are auto-assigned evenly around the colour wheel. Override them with a named integer vector of HSL hue angles (0–360):

glassMultiSelect("f", fruits,
  check_style = "filled",
  hues = c(apple = 0, banana = 50, cherry = 340, mango = 30, peach = 20)
)

Show / hide UI chrome

All three interactive chrome elements can be toggled independently. Defaults are all TRUE:

glassMultiSelect("f", fruits,
  show_style_switcher = FALSE,   # hide the Check / Box / Fill row
  show_select_all     = FALSE,   # hide the "Select all" row
  show_clear_all      = FALSE    # hide the "Clear all" footer link
)

Filter tag pills with `glassFilterTags()`

Place a glassFilterTags() container anywhere on the page to show the active selections as removable tag pills. The JS engine keeps them in sync automatically — clicking × on a tag deselects that option.

ui <- fluidPage(
  useGlassTabs(),
  glassMultiSelect("cat", fruits, show_style_switcher = FALSE),
  glassFilterTags("cat")    # can be placed anywhere, even in a different tab pane
)

You can place multiple glassFilterTags("cat") containers for the same filter — all will stay in sync.

Server-side access

Read the selection directly from input$<inputId>, or use the convenience wrapper glassMultiSelectServer():

server <- function(input, output, session) {

  # Direct access
  observe({
    message("Selected: ", paste(input$pick, collapse = ", "))
    message("Style: ",    input$pick_style)
  })

  # Typed reactive wrapper
  ms <- glassMultiSelectServer("pick")
  observe({
    message("Selected: ", paste(ms$selected(), collapse = ", "))
    message("Style: ",    ms$style())
  })
}

Theming

Built-in presets

glassMultiSelect("f", fruits, theme = "dark")   # default
glassMultiSelect("f", fruits, theme = "light")  # white panel, dark text

Custom theme with `glass_select_theme()`

Supply only the colors you want to change:

# One field — accent colour only
glassMultiSelect("f", fruits,
  theme = glass_select_theme(accent_color = "#f59e0b")
)

# Two fields
glassMultiSelect("f", fruits,
  theme = glass_select_theme(
    text_color   = "#1e293b",
    accent_color = "#2563eb"
  )
)

# All four fields
glassMultiSelect("f", fruits,
  theme = glass_select_theme(
    bg_color     = "#1a0a2e",
    border_color = "#a855f7",
    text_color   = "#ede9fe",
    accent_color = "#a855f7"
  )
)

Argument	What it controls
`bg_color`	Dropdown panel and trigger button background
`border_color`	Border colour
`text_color`	Main text and label colour
`accent_color`	Tick marks, badge, checked highlights, Clear all link

Standalone usage — no tabs required

glassMultiSelect() is fully independent of the tab widget. You only need useGlassTabs() for the CSS and JS:

library(shiny)
library(glasstabs)

sales <- data.frame(
  region  = c("North","North","South","South","East","West"),
  product = c("Alpha","Beta","Alpha","Gamma","Beta","Alpha"),
  revenue = c(42000, 31000, 27000, 55000, 38000, 61000)
)

ui <- fluidPage(
  useGlassTabs(),
  glassMultiSelect("region",  c(North="North", South="South",
                                East="East",   West="West"),
                   show_style_switcher = FALSE),
  glassMultiSelect("product", c(Alpha="Alpha", Beta="Beta", Gamma="Gamma"),
                   show_style_switcher = FALSE,
                   check_style = "check-only"),
  glassFilterTags("region"),
  glassFilterTags("product"),
  tableOutput("tbl")
)

server <- function(input, output, session) {
  filtered <- reactive({
    sales[sales$region  %in% (input$region  %||% unique(sales$region)) &
          sales$product %in% (input$product %||% unique(sales$product)), ]
  })
  output$tbl <- renderTable(filtered())
}

shinyApp(ui, server)

Multiple dropdowns on one page

Each glassMultiSelect() is scoped to its own inputId and works independently. When one dropdown is open it automatically floats above all others:

ui <- fluidPage(
  useGlassTabs(),
  glassMultiSelect("a", c(X = "x", Y = "y", Z = "z")),
  glassMultiSelect("b", c(P = "p", Q = "q", R = "r"),
                   check_style = "filled",
                   show_style_switcher = FALSE)
)