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[DataGrid] Add Hierarchical DataGrid functionality #4484

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@vnbaaij vnbaaij commented Jan 26, 2026

This pull request introduces hierarchical data support for the FluentDataGrid component, enabling grids to display parent-child relationships and multi-level hierarchies. It adds new demo pages and examples to showcase hierarchical grids, including an organization chart. The changes also include updates to sample data and documentation to support these features.

Hierarchical DataGrid Support

  • Added HierarchicalGridItem<TItem, TGridItem> base class, IHierarchicalGridItem interface, and HierarchicalGridUtilities utility class to enable hierarchical relationships in grid items. These types allow items to have children, track hierarchy depth, and manage collapsed/hidden states.
  • Introduced new properties (HierarchicalToggle for columns and OnToggle event callback for grids) to control and respond to row expand/collapse actions in hierarchical grids. [1] [2]

Demo Pages and Examples

  • Added DataGridHierarchical.razor and DataGridHierarchicalOrgChart.razor examples, demonstrating hierarchical data display and multi-level nesting in the grid, including programmatic expand/collapse of rows. [1] [2] [3]
  • Created a new documentation/demo page at /datagrid-hierarchical to showcase hierarchical grid features and usage.
  • Updated the advanced grid navigation to include a link to the new hierarchical grid demo.
image image

Sample Data Improvements

  • Refactored sample data collections to use modern C# collection expressions for improved readability and performance. [1] [2]
  • Updated field modifiers for sample data arrays to match best practices.

@vnbaaij vnbaaij added this to the v4.13.3 milestone Jan 26, 2026
@vnbaaij vnbaaij requested a review from dvoituron as a code owner January 26, 2026 19:46
Copilot AI review requested due to automatic review settings January 26, 2026 19:46
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Summary - Unit Tests Code Coverage

Summary
Generated on: 1/28/2026 - 10:04:39 AM
Coverage date: 1/28/2026 - 10:04:28 AM
Parser: Cobertura
Assemblies: 1
Classes: 257
Files: 367
Line coverage: 60.9% (6256 of 10259)
Covered lines: 6256
Uncovered lines: 4003
Coverable lines: 10259
Total lines: 34546
Branch coverage: 53% (3163 of 5961)
Covered branches: 3163
Total branches: 5961
Method coverage: Feature is only available for sponsors
Tag: 5147_21433722669

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Pull request overview

This pull request adds hierarchical data support to the FluentDataGrid component, enabling the display of parent-child relationships with expandable/collapsible rows. The implementation introduces core abstractions (IHierarchicalGridItem, HierarchicalGridItem<TItem, TGridItem>, and HierarchicalGridUtilities) along with UI enhancements for toggling hierarchy levels and demo examples showcasing the feature.

Changes:

  • Added hierarchical grid infrastructure with interface, base class, and utility methods
  • Extended FluentDataGrid and column components with hierarchical toggle support and validation
  • Created demo pages with examples showing Olympic medal data by continent and organizational chart scenarios
  • Updated sample data to include continent codes for hierarchical grouping

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 7 comments.

Show a summary per file
File Description
src/Core/Components/DataGrid/IHierarchicalGridItem.cs Defines interface for grid items that can participate in hierarchies
src/Core/Components/DataGrid/HierarchicalGridItem.cs Base class providing hierarchy state management (depth, collapsed, hidden)
src/Core/Components/DataGrid/HierarchicalGridUtilities.cs Utility methods for building hierarchical structures from flat lists
src/Core/Components/DataGrid/FluentDataGrid.razor.cs Adds OnToggle event and validation for hierarchical toggle columns
src/Core/Components/DataGrid/FluentDataGrid.razor Implements UI rendering for expand/collapse buttons and indentation
src/Core/Components/DataGrid/Columns/ColumnBase.razor.cs Adds HierarchicalToggle parameter to enable hierarchy controls on columns
src/Core/Components/DataGrid/FluentDataGridCell.razor.css Styling for hierarchical toggle buttons and indentation
examples/Demo/Shared/Pages/DataGrid/Examples/DataGridHierarchical.razor Demo showing Olympic medals grouped by continent
examples/Demo/Shared/Pages/DataGrid/Examples/DataGridHierarchicalOrgChart.razor Demo showing multi-level organization chart
examples/Demo/Shared/Pages/DataGrid/Examples/DataGridHierarchicalOrgChart.razor.cs Code-behind with sample data generation for org chart
examples/Demo/Shared/Pages/DataGrid/Pages/DataGridHierarchicalPage.razor Documentation page for hierarchical grid feature
examples/Demo/Shared/SampleData/Olympics.cs Updated Country record to include continent code
examples/Demo/Shared/SampleData/DataSource.cs Added continent data and updated Olympic data with continent codes
examples/Demo/Shared/Shared/DemoNavProvider.cs Added navigation link to hierarchical grid demo
examples/Demo/Shared/Pages/DataGrid/DataGridPage.razor Added link to hierarchical grid in advanced features section

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@vnbaaij vnbaaij enabled auto-merge (squash) January 28, 2026 11:35
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