Migration from v6 to v7

This guide describes the changes needed to migrate the Tree View from v6 to v7.

Introduction

TBD

Start using the alpha release

In package.json, change the version of the tree view package to next.

-"@mui/x-tree-view": "6.x.x",
+"@mui/x-tree-view": "next",

Update @mui/material package

To have the option of using the latest API from @mui/material, the package peer dependency version has been updated to ^5.15.0. It is a change in minor version only, so it should not cause any breaking changes. Please update your @mui/material package to this or a newer version.

Breaking changes

Since v7 is a major release, it contains changes that affect the public API. These changes were done for consistency, improved stability and to make room for new features.

✅ Use SimpleTreeView instead of TreeView

The TreeView component has been deprecated and will be removed in the next major. You can start replacing it with the new SimpleTreeView component which has exactly the same API:

-import { TreeView } from '@mui/x-tree-view';
+import { SimpleTreeView } from '@mui/x-tree-view';

-import { TreeView } from '@mui/x-tree-view/TreeView';
+import { SimpleTreeView } from '@mui/x-tree-view/SimpleTreeView';

   return (
-    <TreeView>
+    <SimpleTreeView>
       <TreeItem nodeId="1" label="First item" />
-    </TreeView>
+    </SimpleTreeView>
   );

If you were using theme augmentation, you will also need to migrate it:

 const theme = createTheme({
   components: {
-    MuiTreeView: {
+    MuiSimpleTreeView: {
       styleOverrides: {
         root: {
           opacity: 0.5,
         },
       },
     },
   },
 });

If you were using the treeViewClasses object, you can replace it with the new simpleTreeViewClasses object:

 import { treeViewClasses } from '@mui/x-tree-view/TreeView';
 import { simpleTreeViewClasses } from '@mui/x-tree-view/SimpleTreeView';

-const rootClass = treeViewClasses.root;
+const rootClass = simpleTreeViewClasses.root;

Use slots to define the item icons

Define expandIcon

The icon used to expand the children of a node (rendered when this node is collapsed) is now defined as a slot both on the Tree View and the TreeItem components.

If you were using the ChevronRight icon from @mui/icons-material, you can stop passing it to your component because it is now the default value:

-import ChevronRightIcon from '@mui/icons-material/ChevronRight';

 <SimpleTreeView
-  defaultExpandIcon={<ChevronRightIcon />}
 >
   {items}
 </SimpleTreeView>

If you were passing another icon to your Tree View component, you need to use the new expandIcon slot on this component:

 <SimpleTreeView
-  defaultExpandIcon={<MyCustomExpandIcon />}
+  slots={{ expandIcon: MyCustomExpandIcon }}
 >
   {items}
 </SimpleTreeView>

If you were passing another icon to your TreeItem component, you need to use the new expandIcon slot on this component:

  <SimpleTreeView>
    <TreeItem
      nodeId="1"
      label="Node 1"
-     expandIcon={<MyCustomExpandIcon />}
+     slots={{ expandIcon: MyCustomExpandIcon }}
    />
  </SimpleTreeView>

Define collapseIcon

The icon used to collapse the children of a node (rendered when this node is expanded) is now defined as a slot both on the Tree View and the TreeItem components.

If you were using the ExpandMore icon from @mui/icons-material, you can stop passing it to your component because it is now the default value:

- import ExpandMoreIcon from '@mui/icons-material/ExpandMore';

  <SimpleTreeView
-   defaultCollapseIcon={<ExpandMoreIcon />}
  >
    {items}
  </SimpleTreeView>

If you were passing another icon to your Tree View component, you need to use the new collapseIcon slot on this component:

  <SimpleTreeView
-   defaultCollapseIcon={<MyCustomCollapseIcon />}
+   slots={{ collapseIcon: MyCustomCollapseIcon }}
  >
    {items}
  </SimpleTreeView>

If you were passing another icon to your TreeItem component, you need to use the new collapseIcon slot on this component:

  <SimpleTreeView>
    <TreeItem
      nodeId="1"
      label="Node 1"
-     collapseIcon={<MyCustomCollapseIcon />}
+     slots={{ collapseIcon: MyCustomCollapseIcon }}
    />
  </SimpleTreeView>

Replace parentIcon

The parentIcon prop has been removed from the Tree View components.

If you were passing an icon to your Tree View component, you can achieve the same behavior by passing the same icon to both the collapseIcon and the expandIcon slots on this component:

  <SimpleTreeView
-   defaultParentIcon={<MyCustomParentIcon />}
+   slots={{ collapseIcon: MyCustomParentIcon, expandIcon: MyCustomParentIcon }}
  >
    {items}
  </SimpleTreeView>

Define endIcon

The icon rendered next to an item without children is now defined as a slot both on the Tree View and the TreeItem components.

If you were passing an icon to your Tree View component, you need to use the new endIcon slot on this component:

  <SimpleTreeView
-   defaultEndIcon={<MyCustomEndIcon />}
+   slots={{ endIcon: MyCustomEndIcon }}
  >
    {items}
  </SimpleTreeView>

If you were passing an icon to your TreeItem component, you need to use the new endIcon slot on this component:

  <SimpleTreeView>
    <TreeItem
      nodeId="1"
      label="Node 1"
-     endIcon={<MyCustomEndIcon />}
+     slots={{ endIcon: MyCustomEndIcon }}
    />
  </SimpleTreeView>

Define icon

The icon rendered next to an item is now defined as a slot on the TreeItem component.

If you were passing an icon to your TreeItem component, you need to use the new icon slot on this component:

  <SimpleTreeView>
    <TreeItem
      nodeId="1"
      label="Node 1"
-     icon={<MyCustomIcon />}
+     slots={{ icon: MyCustomIcon }}
    />
  </SimpleTreeView>

✅ Use slots to define the group transition

The component used to animate the item children is now defined as a slot on the TreeItem component.

If you were passing a TransitionComponent or TransitionProps to your TreeItem component, you need to use the new groupTransition slot on this component:

 <SimpleTreeView>
   <TreeItem
     nodeId="1"
     label="Node 1"
-    TransitionComponent={Fade}
+    slots={{ groupTransition: Fade }}
-    TransitionProps={{ timeout: 600 }}
+    slotProps={{ groupTransition: { timeout: 600 } }}
   />
 </SimpleTreeView>

Rename the group class of the TreeItem component

The group class of the TreeItem component has been renamed to groupTransition to match with its new slot name.

 const StyledTreeItem = styled(TreeItem)({
-  [`& .${treeItemClasses.group}`]: {
+  [`& .${treeItemClasses.groupTransition}`]: {
    marginLeft: 20,
  },
 });

✅ Rename onNodeToggle, expanded and defaultExpanded

The expansion props have been renamed to better describe their behaviors:

 <TreeView
-  onNodeToggle={handleExpansionChange}
+  onExpandedNodesChange={handleExpansionChange}

-  expanded={expandedNodes}
+  expandedNodes={expandedNodes}

-  defaultExpanded={defaultExpandedNodes}
+  defaultExpandedNodes={defaultExpandedNodes}
 />

✅ Rename onNodeSelect, selected, and defaultSelected

The selection props have been renamed to better describe their behaviors:

 <TreeView
-  onNodeSelect={handleSelectionChange}
+  onSelectedNodesChange={handleSelectionChange}

-  selected={selectedNodes}
+  selectedNodes={selectedNodes}

-  defaultSelected={defaultSelectedNodes}
+  defaultSelectedNodes={defaultSelectedNodes}
 />

✅ Use useTreeItemState instead of useTreeItem

The useTreeItem hook has been renamed useTreeItemState. This will help create a new headless version of the TreeItem component based on a future useTreeItem hook.

-import { TreeItem, useTreeItem } from '@mui/x-tree-view/TreeItem';
+import { TreeItem, useTreeItemState } from '@mui/x-tree-view/TreeItem';

 const CustomContent = React.forwardRef((props, ref) => {
-  const { disabled } = useTreeItem(props.nodeId);
+  const { disabled } = useTreeItemState(props.nodeId);

   // Render some UI
 });

 function App() {
   return (
     <SimpleTreeView>
       <TreeItem ContentComponent={CustomContent} />
     </SimpleTreeView>
   )
 }