FilterGroup Component Documentation

The FilterGroup component provides a reusable, collapsible filter section with checkbox functionality for selecting items within a category. It is designed to create consistent filtering interfaces throughout the application, particularly for categorical data filtering in lists and dashboards.

Features

• Implements a collapsible accordion interface for space-efficient filtering
• Displays a customisable list of filterable items as checkboxes
• Maintains selection state externally for flexibility
• Provides visual indicators for selected items
• Toggles visibility of filter options with smooth interactions
• Uses consistent styling with other filter components
• Enhances accessibility with proper labelling and keyboard support
• Supports any type of categorical data filtering

Props

The FilterGroup component accepts the following props:

Prop	Type	Default	Description
title	string	Required	The title displayed in the filter group header
sectionKey	string	Required	A unique identifier for this filter section
isExpanded	boolean	Required	Controls whether the filter options are visible
toggleSection	function	Required	Function called when the section header is clicked
items	array	Required	Array of items to display as filterable options
selectedItems	array	[]	Array of currently selected items
onItemChange	function	Required	Function called when an item is selected/deselected

Usage

import FilterGroup from '../components/Projects/FilterGroup';

function FilterableList() {
  // State for tracking expanded sections
  const [expandedSections, setExpandedSections] = useState({
    category: true,
    status: false
  });

  // State for tracking selected filters
  const [filters, setFilters] = useState({
    category: [],
    status: []
  });

  // Toggle section expansion
  const toggleSection = (section) => {
    setExpandedSections(prev => ({
      ...prev,
      [section]: !prev[section]
    }));
  };

  // Handle filter changes
  const handleFilterChange = (category, value) => {
    setFilters(prevFilters => {
      const updatedFilters = { ...prevFilters };

      if (updatedFilters[category].includes(value)) {
        updatedFilters[category] = updatedFilters[category].filter(
          (item) => item !== value
        );
      } else {
        updatedFilters[category] = [...updatedFilters[category], value];
      }

      return updatedFilters;
    });
  };

  return (
    <div className="filters-container">
      <FilterGroup 
        title="Categories"
        sectionKey="category"
        isExpanded={expandedSections.category}
        toggleSection={toggleSection}
        items={["Web", "Mobile", "Desktop", "Infrastructure"]}
        selectedItems={filters.category}
        onItemChange={handleFilterChange}
      />

      <FilterGroup 
        title="Status"
        sectionKey="status"
        isExpanded={expandedSections.status}
        toggleSection={toggleSection}
        items={["Active", "Archived", "Planned"]}
        selectedItems={filters.status}
        onItemChange={handleFilterChange}
      />
    </div>
  );
}

Implementation Details

The FilterGroup component consists of two main parts:

Header Section

• Contains the filter category title
• Includes a chevron icon that rotates based on expanded state
• Serves as a clickable button to toggle the visibility of filter options

Filter Options Section

• Contains a list of checkboxes for individual filter options
• Displays a custom checkbox design with checkmark icons
• Shows or hides based on the isExpanded prop
• Maintains visual indicators for selected items

Styling

The FilterGroup component leverages the application's existing CSS classes:

• .filter-group: Contains the entire filter group component
• .filter-group-title: Styles the header with appropriate spacing and interactions
• .filter-accordion-header: Adds accordion-specific styling and cursor indicators
• .accordion-icon: Handles the rotation of the chevron icon
• .filter-checkbox-group: Contains and styles the list of checkbox options
• .filter-checkbox-label: Styles each individual checkbox label
• .custom-checkbox: Implements a custom-styled checkbox with selected state
• .checkbox-icon: Styles the checkmark icon for selected items
• .sr-only: Hides the native checkbox input while maintaining accessibility

Accessibility Considerations

The FilterGroup component enhances accessibility by:

• Using semantic HTML structure for better screen reader compatibility
• Maintaining keyboard navigability through standard checkbox inputs
• Providing visual indicators of state (expanded/collapsed, selected/unselected)
• Using appropriate ARIA attributes through the underlying checkbox inputs
• Maintaining adequate contrast for text and interactive elements

Integration with Other Components

The FilterGroup component is primarily used within the Projects component to create the filtering interface for:

• Project stages
• Development types
• Hosting platforms
• Architecture categories

This component helps unify the filtering interface across the application while reducing code duplication and ensuring consistent behaviour.