name: "Dueling Picklist"

description: "A dueling-picklist is used to move options between two lists and is often referred to as a multi-select. Sometimes, the list options can then be re-ordered, depending on the use case."

category: "Input"

slds_classes:
  root: "slds-dueling-list"
  elements:
    - class: "slds-dueling-list__column"
      description: "Column container for each list and button group"
      purpose: "Organizes the two lists and control buttons in a flex layout"
    - class: "slds-dueling-list__options"
      description: "Bounding visual container for listbox of options"
      purpose: "Contains the selectable options list with border and scrollable area"
  modifiers:
    - class: "slds-dueling-list__column_responsive"
      description: "Responsive layout modifier for dueling picklist columns"
      usage: "Applied to columns containing options to make them responsive and flexible"
  states:
    - class: "slds-is-selected"
      description: "Selected state of a listbox option"
      trigger: "When an option is selected (aria-selected='true')"
    - class: "slds-is-grabbed"
      description: "Grabbed state of a listbox option during drag"
      trigger: "When an option is being dragged"
    - class: "slds-is-disabled"
      description: "Disabled state for the entire dueling picklist"
      trigger: "When the component is not interactive"

variants:
  - name: "Base"
    description: "Standard dueling picklist with two lists and move buttons"
    classes: ["slds-dueling-list"]
    usage_context: "Default dueling picklist implementation"
    differences: "Two side-by-side lists with buttons to move items between them"
  - name: "Responsive"
    description: "Responsive dueling picklist that adapts to available space"
    classes: ["slds-dueling-list", "slds-dueling-list__column_responsive"]
    usage_context: "Use in narrow regions or responsive layouts"
    differences: "Columns flex to available space, items truncate with ellipsis"

lightning_component:
  name: ""
  url: "https://developer.salesforce.com/docs/component-library/overview/components"
  mapping_notes: "No direct Lightning Base Component - use custom implementation with SLDS classes"

accessibility:
  keyboard_support:
    - "Tab to navigate between lists and buttons"
    - "Up/Down arrows to move focus and selection within a list"
    - "Shift + Up/Down to extend selection"
    - "Ctrl + Up/Down to move focus without changing selection"
    - "Ctrl + Space to toggle selection on focused option"
    - "Ctrl + A to select all options in a list"
    - "Cmd/Ctrl + Left/Right to move selected items between lists"
    - "Space to toggle Drag and Drop mode"
    - "In Drag mode: Up/Down arrows move selected items within current list"
  screen_reader:
    - "List labels announced via aria-labelledby"
    - "Operation instructions announced via aria-describedby"
    - "Selected state announced for each option"
    - "Drag and drop mode announced"
  aria_attributes:
    - "role='listbox' on each options container"
    - "aria-multiselectable='true' on each listbox"
    - "aria-selected on each option (true/false)"
    - "aria-labelledby pointing to list label"
    - "aria-describedby for operation instructions"
    - "tabindex='0' on selected items, '-1' on others"
    - "role='group' on form-element wrapper"
    - "aria-labelledby on group pointing to group label ID"

usage_guidelines:
  when_to_use:
    - "When users need to select multiple options from a large set"
    - "For moving items between available and selected lists"
    - "When reordering selected items is needed"
    - "For complex multi-select scenarios"
  when_not_to_use:
    - "For single selection (use select or combobox)"
    - "When only a few options exist (use checkboxes)"
    - "In very constrained spaces"
    - "When drag and drop is not supported"
  best_practices:
    - "Use group labels (fieldset/legend pattern) for accessibility"
    - "Provide clear operation instructions"
    - "Support both button and keyboard interactions"
    - "Implement proper focus management"
    - "Handle drag and drop gracefully with fallbacks"
    - "Use responsive variant for narrow layouts"
    - "Provide visual feedback for all interactions"
  common_mistakes:
    - "Not implementing proper ARIA listbox patterns"
    - "Missing keyboard navigation support"
    - "Inadequate focus management"
    - "Not providing operation instructions"
    - "Missing group labels for accessibility"

code_examples:
  - title: "Basic Dueling Picklist"
    code: |
      <div class="slds-form-element" role="group" aria-labelledby="dueling-picklist-label">
        <div class="slds-form-element__label slds-form-element__legend" id="dueling-picklist-label">
          Select Options
        </div>
        <div class="slds-form-element__control">
          <div class="slds-dueling-list">
            <div class="slds-dueling-list__column">
              <span class="slds-form-element__label">Available</span>
              <div class="slds-dueling-list__options" role="listbox" aria-multiselectable="true" aria-labelledby="available-label">
                <div role="option" aria-selected="false" tabindex="0">Option 1</div>
                <div role="option" aria-selected="false" tabindex="-1">Option 2</div>
                <div role="option" aria-selected="false" tabindex="-1">Option 3</div>
              </div>
            </div>
            <div class="slds-dueling-list__column">
              <button class="slds-button slds-button_neutral">Move Right</button>
              <button class="slds-button slds-button_neutral">Move Left</button>
            </div>
            <div class="slds-dueling-list__column">
              <span class="slds-form-element__label">Selected</span>
              <div class="slds-dueling-list__options" role="listbox" aria-multiselectable="true" aria-labelledby="selected-label">
                <div role="option" aria-selected="false" tabindex="0">Option 4</div>
              </div>
            </div>
          </div>
        </div>
      </div>
    description: "Basic dueling picklist with two lists and move buttons"
  - title: "Responsive Dueling Picklist"
    code: |
      <div class="slds-form-element" role="group" aria-labelledby="responsive-picklist-label">
        <div class="slds-form-element__label slds-form-element__legend" id="responsive-picklist-label">
          Select Options
        </div>
        <div class="slds-form-element__control">
          <div class="slds-dueling-list">
            <div class="slds-dueling-list__column slds-dueling-list__column_responsive">
              <span class="slds-form-element__label">Available</span>
              <div class="slds-dueling-list__options" role="listbox" aria-multiselectable="true">
                <div role="option" aria-selected="false" tabindex="0">Option 1</div>
                <div role="option" aria-selected="false" tabindex="-1">Option 2</div>
              </div>
            </div>
            <div class="slds-dueling-list__column">
              <button class="slds-button slds-button_neutral">Move Right</button>
              <button class="slds-button slds-button_neutral">Move Left</button>
            </div>
            <div class="slds-dueling-list__column slds-dueling-list__column_responsive">
              <span class="slds-form-element__label">Selected</span>
              <div class="slds-dueling-list__options" role="listbox" aria-multiselectable="true">
                <div role="option" aria-selected="false" tabindex="0">Option 3</div>
              </div>
            </div>
          </div>
        </div>
      </div>
    description: "Responsive dueling picklist that adapts to available space"

styling_hooks: []

dependencies:
  css_files: ["dueling-picklist.css", "form-element.css", "listbox.css", "button.css"]
  javascript:
    - "Listbox selection management"
    - "Item movement between lists"
    - "Drag and drop functionality (optional)"
    - "Keyboard navigation"
    - "Focus management"
  icons: []
  other_components: ["form-element", "listbox", "button"]

related_components:
  - name: "Listbox"
    relationship: "depends-on"
    description: "ARIA listbox component used for each list"
  - name: "Select"
    relationship: "alternative"
    description: "For single selection scenarios"
  - name: "Multi-Select"
    relationship: "similar"
    description: "Alternative multi-select component"

references:
  official_docs: "https://v1.lightningdesignsystem.com/components/dueling-picklist/"
  design_guidelines: "https://v1.lightningdesignsystem.com/components/dueling-picklist/"
metadata:
  version: "1.0.0"
  last_updated: "2025-01-15"
  author: "SLDS Documentation Team"
  slds_version: "2.27.2"
  review_status: "complete"
  source: "official-slds"
  notes: "Created from official SLDS documentation and design-system-internal source code with CSS selector annotations. Follows ARIA listbox practices for accessibility."