Tree views
Use a tree view to display objects, such as folders, in a hierarchical manner.
Objects in the tree view are nodes. The highest node is the root node. A node in the tree can have child nodes under it. A node that has a child is a parent node.
Users can perform the following action in a tree view:
|
User goal |
Action using the navigation keys |
Action using a touch screen |
Action using a physical keyboard |
|---|---|---|---|
|
Expand or collapse an object with a plus sign (+) or minus sign (-) in a hierarchy. |
Click the trackpad. |
Tap the object. |
Press the Space key. |
Best practice: Implementing tree views
- Provide a pop-up menu if users can perform multiple actions when they click a parent node.
- Include a root node only if users need the ability to perform actions on the entire tree. Otherwise, exclude the root node.
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