Behavior comparison

Data grid vs Tree view

Decisive difference

Data grid navigates rows and columns of cells with arrow keys; Tree view expands and collapses parent-child nodes in a hierarchy.

Data gridChoose Data grid if the data is tabular and the user edits or navigates many cells efficiently.
Tree viewChoose Tree view if the structure is a real hierarchy, like folders, that the user expands level by level.

See the nine dimensions See the sources

Decision

Family question

Should people read tabular data, interact cell by cell, or expand a hierarchy?

Nine dimensions

Dimension	Data gridData grid	Tree viewTree view
Trigger	Tab enters one managed focus point; directional keys then move among cells.	Tab enters the tree; arrows move focus and expand or collapse parent items.
Modality	Non-modal composite widget with an internal focus model.	Non-modal composite widget for a hierarchical collection.
Placement	A bounded tabular workspace with persistent headers and a visible active cell.	A vertically ordered hierarchy whose indentation and disclosure state expose parent-child relationships.
Interactivity	Roving focus, arrow navigation, sorting, selection, and editing are explicit; focus and selection remain distinguishable.	Managed focus, expand/collapse, optional selection, and activation are separate and visibly distinguishable.
Focus	Use one consistent roving-tabindex or aria-activedescendant strategy, keep the active cell visible, and never put every cell in the page tab sequence.	Use roving tabindex or aria-activedescendant consistently, and keep visible focus distinct from aria-selected or aria-checked.
Dismissal	The grid is not dismissed; Escape exits cell interaction and restores grid navigation.	The tree is not dismissed; Left Arrow collapses an open parent, and Escape is not a required tree command.
Accessible role	grid > row > (columnheader \| rowheader \| gridcell)	tree > treeitem + group
Use case	Large tabular data needs efficient keyboard navigation	People navigate a true parent-child hierarchy
Mobile behavior	Provide a tested touch model or a simpler list/table alternative when dense two-dimensional operation is impractical.	Use generous disclosure targets and consider progressive drill-down when deep indentation leaves too little room.

Data grid vs Tree view

Decisive difference

Data grid navigates rows and columns of cells with arrow keys; Tree view expands and collapses parent-child nodes in a hierarchy.

Data gridChoose Data grid if the data is tabular and the user edits or navigates many cells efficiently.
Tree viewChoose Tree view if the structure is a real hierarchy, like folders, that the user expands level by level.

See the nine dimensions See the sources

Nine dimensions

Dimension	Data gridData grid	Tree viewTree view
Trigger	Tab enters one managed focus point; directional keys then move among cells.	Tab enters the tree; arrows move focus and expand or collapse parent items.
Modality	Non-modal composite widget with an internal focus model.	Non-modal composite widget for a hierarchical collection.
Placement	A bounded tabular workspace with persistent headers and a visible active cell.	A vertically ordered hierarchy whose indentation and disclosure state expose parent-child relationships.
Interactivity	Roving focus, arrow navigation, sorting, selection, and editing are explicit; focus and selection remain distinguishable.	Managed focus, expand/collapse, optional selection, and activation are separate and visibly distinguishable.
Focus	Use one consistent roving-tabindex or aria-activedescendant strategy, keep the active cell visible, and never put every cell in the page tab sequence.	Use roving tabindex or aria-activedescendant consistently, and keep visible focus distinct from aria-selected or aria-checked.
Dismissal	The grid is not dismissed; Escape exits cell interaction and restores grid navigation.	The tree is not dismissed; Left Arrow collapses an open parent, and Escape is not a required tree command.
Accessible role	grid > row > (columnheader \| rowheader \| gridcell)	tree > treeitem + group
Use case	Large tabular data needs efficient keyboard navigation	People navigate a true parent-child hierarchy
Mobile behavior	Provide a tested touch model or a simpler list/table alternative when dense two-dimensional operation is impractical.	Use generous disclosure targets and consider progressive drill-down when deep indentation leaves too little room.