Data Grid - Tree data

Use Tree data to handle rows with parent / child relationship.

To enable the Tree data, you simply have to use the treeData prop as well as provide a getTreeDataPath prop. The getTreeDataPath function returns an array of strings which represents the path to a given row.

// The following examples will both render the same tree
// - Sarah
//     - Thomas
//         - Robert
//         - Karen

const columns: GridColDef[] = [{ field: 'jobTitle', width: 250 }];

// Without transformation
const rows: GridRowsProp = [
  { path: ['Sarah'], jobTitle: 'CEO', id: 0 },
  { path: ['Sarah', 'Thomas'], jobTitle: 'Head of Sales', id: 1 },
  { path: ['Sarah', 'Thomas', 'Robert'], jobTitle: 'Sales Person', id: 2 },
  { path: ['Sarah', 'Thomas', 'Karen'], jobTitle: 'Sales Person', id: 3 },
];

<DataGridPro
  treeData
  getTreeDataPath={(row) => row.path}
  rows={rows}
  columns={columns}
/>;

// With transformation
const rows: GridRowsProp = [
  { path: 'Sarah', jobTitle: 'CEO', id: 0 },
  { path: 'Sarah/Thomas', jobTitle: 'Head of Sales', id: 1 },
  { path: 'Sarah/Thomas/Robert', jobTitle: 'Sales Person', id: 2 },
  { path: 'Sarah/Thomas/Karen', jobTitle: 'Sales Person', id: 3 },
];

<DataGridPro
  treeData
  getTreeDataPath={(row) => row.path.split('/')}
  rows={rows}
  columns={columns}
/>;

Custom grouping column

Same behavior as for the Row grouping except for the leafField and mainGroupingCriteria which are not applicable for the Tree data.

Accessing the grouping column field

If you want to access the grouping column field, for instance, to use it with column pinning, the GRID_TREE_DATA_GROUPING_FIELD constant is available.

<DataGridPro
  treeData
  initialState={{
    pinnedColumns: {
      left: [GRID_TREE_DATA_GROUPING_FIELD],
    },
  }}
  {...otherProps}
/>

Group expansion

Same behavior as for the Row grouping.

Gaps in the tree

If some entries are missing to build the full tree, the DataGridPro will automatically create rows to fill those gaps.

Filtering

A node is included if one of the following criteria is met:

at least one of its descendants is passing the filters
it is passing the filters

By default, the filtering is applied to every depth of the tree. You can limit the filtering to the top-level rows with the disableChildrenFiltering prop.

Sorting

By default, the sorting is applied to every depth of the tree. You can limit the sorting to the top-level rows with the disableChildrenSorting prop.

If you are using sortingMode="server", the children of a row must always immediately follow their parent. For instance:

// ✅ The row A.A is immediately after its parent
const validRows = [{ path: ['A'] }, { path: ['A', 'A'] }, { path: ['B'] }];

// ❌ The row A.A is not immediately after its parent
const invalidRows = [{ path: ['A'] }, { path: ['B'] }, { path: ['A', 'A'] }];

Children lazy-loading 🚧

Alternatively, you can achieve a similar behavior by implementing this feature outside the component as shown below. This implementation does not support every feature of the data grid but can be a good starting point for large datasets.

The idea is to add a property descendantCount on the row and to use it instead of the internal grid state. To do so, you need to override both the renderCell of the grouping column and to manually open the rows by listening to rowExpansionChange event.