name: Expression
description: A formula builder interface that allows users to construct complex expressions, calculations, and logical conditions
  through visual components, operators, and functions with syntax validation and auto-completion.
category: Input
slds_classes:
  root: ''
  elements:
  - class: slds-expression__group
    description: Logical grouping container for expression elements
    purpose: Groups related expression components together
  - class: slds-expression__row
    description: Individual row within expression builder
    purpose: Contains a single expression statement or condition
  - class: slds-expression__buttons
    description: Action buttons for expression manipulation
    purpose: Contains add, remove, and group action buttons
  modifiers: []
  states:
  - class: slds-has-error
    description: Error state for invalid expressions
    trigger: Applied when expression syntax is invalid
  - class: slds-is-editing
    description: Active editing state
    trigger: Applied when user is actively editing expression
variants:
- name: Base
  description: Standard expression builder interface
  classes: []
  usage_context: Default implementation for expression building
  differences: Basic expression builder with fields and operators
- name: Compound
  description: Multi-condition expression builder
  classes: []
  usage_context: When multiple logical conditions are needed
  differences: Support for AND/OR logic and grouped conditions
- name: Advanced
  description: Advanced expression builder with functions
  classes: []
  usage_context: When complex calculations and functions are required
  differences: Includes function library and advanced operators
lightning_component:
  name: No direct component
  url: https://developer.salesforce.com/docs/component-library/overview/components
  mapping_notes: No direct Lightning Base Component equivalent - typically implemented using custom components with lightning-combobox
    and lightning-input patterns
accessibility:
  keyboard_support:
  - Tab navigation through expression elements
  - Enter/Space to activate buttons and dropdowns
  - Arrow keys for navigating expression components
  - Delete/Backspace to remove expression elements
  screen_reader:
  - Expression structure and logic announced
  - Field and operator selections described
  - Validation errors clearly communicated
  - Expression summary provided
  aria_attributes:
  - role='group' for expression sections
  - aria-label for expression components
  - aria-describedby for validation messages
  - aria-expanded for collapsible groups
  - aria-invalid for error states
usage_guidelines:
  when_to_use:
  - For building complex business rules and formulas
  - When users need to create calculated fields
  - For advanced filtering and search criteria
  - In workflow and automation rule builders
  when_not_to_use:
  - For simple single-field filters (use basic inputs)
  - When users don't need complex logic
  - For purely visual/design-related conditions
  best_practices:
  - Provide clear field and operator labels
  - Include helpful examples and documentation
  - Validate expressions in real-time
  - Offer function assistance and auto-completion
  - Group related conditions logically
  common_mistakes:
  - Poor validation feedback
  - Overwhelming users with too many options
  - Unclear operator meanings
  - Not providing expression examples
code_examples:
- title: Basic Expression Builder
  description: Advanced expression builder including functions and calculations
  code: "<div class=\"\">\n      <div class=\"\">\n        <div class=\"slds-expression__group\">\n          <div class=\"\
    slds-expression__row\">\n            <div class=\"slds-grid slds-grid_align-center\">\n              <div class=\"slds-col\"\
    >\n                <div class=\"slds-form-element\">\n                  <label class=\"slds-form-element__label\">Function</label>\n\
    \                  <div class=\"slds-form-element__control\">\n                    <div class=\"slds-combobox_container\"\
    >\n                      <div class=\"slds-combobox slds-dropdown-trigger slds-dropdown-trigger_click\">\n           \
    \             <div class=\"slds-combobox__form-element slds-input-has-icon slds-input-has-icon_right\">\n            \
    \              <input type=\"text\" class=\"slds-input slds-combobox__input\" value=\"SUM(\" readonly>\n             \
    \             <span class=\"slds-icon_container slds-icon-utility-down slds-input__icon slds-input__icon_right\">\n  \
    \                          <svg class=\"slds-icon slds-icon_x-small\" aria-hidden=\"true\">\n                        \
    \      <use xlink:href=\"/assets/icons/utility-sprite/svg/symbols.svg#down\"></use>\n                            </svg>\n\
    \                          </span>\n                        </div>\n                      </div>\n                   \
    \ </div>\n                  </div>\n                </div>\n              </div>\n              <div class=\"slds-col\
    \ slds-p-horizontal_x-small\">\n                <div class=\"slds-form-element\">\n                  <label class=\"slds-form-element__label\"\
    >Field</label>\n                  <div class=\"slds-form-element__control\">\n                    <input type=\"text\"\
    \ class=\"slds-input\" value=\"Opportunity Amount\">\n                  </div>\n                </div>\n             \
    \ </div>\n              <div class=\"slds-col slds-no-flex\">\n                <span class=\"slds-text-body_regular\"\
    >)</span>\n              </div>\n            </div>\n          </div>\n          <div class=\"slds-expression__row slds-m-top_small\"\
    >\n            <div class=\"slds-form-element\">\n              <label class=\"slds-form-element__label\">Preview</label>\n\
    \              <div class=\"slds-form-element__control\">\n                <div class=\"slds-form-element__static slds-p-around_small\
    \ slds-text-color_weak\">\n                  SUM(Opportunity.Amount)\n                </div>\n              </div>\n \
    \           </div>\n          </div>\n        </div>\n        <div class=\"slds-expression__buttons slds-m-top_small\"\
    >\n          <div class=\"slds-button-group\">\n            <button class=\"slds-button slds-button_neutral\">Insert Field</button>\n\
    \            <button class=\"slds-button slds-button_neutral\">Insert Function</button>\n            <button class=\"\
    slds-button slds-button_neutral\">Insert Operator</button>\n          </div>\n        </div>\n      </div>\n      </div>\n"
dependencies:
  css_files:
  - expression.css
  - form-element.css
  - combobox.css
  - button.css
  javascript:
  - expression.js
  icons:
  - utility-sprite.svg
  other_components:
  - form-element
  - combobox
  - button
  - select
  - input
related_components:
- name: Form Element
  relationship: container
  description: Uses form elements for input controls
- name: Combobox
  relationship: depends-on
  description: Uses combobox for field and function selection
- name: Visual Picker
  relationship: alternative
  description: Alternative for simpler selection scenarios
references:
  official_docs: https://v1.lightningdesignsystem.com/components/expression/
metadata:
  version: 1.0.0
  last_updated: '2025-11-12'
  review_status: complete
  notes: ' Cleaned invalid classes and CSS variables on 2025-11-12 using slds-plus.css as source of truth.'