Migration from v6 to v7

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

Introduction

This is a reference guide for upgrading @mui/x-tree-view from v6 to v7. To read more about the changes from the new major, check out the blog post about the release of MUI X v7.

Start using the new release

In package.json, change the version of the tree view package to ^7.0.0.

-"@mui/x-tree-view": "6.x.x",
+"@mui/x-tree-view": "^7.0.0",

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 ^5.15.14. 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.

Drop the legacy bundle

The support for IE 11 has been removed from all MUI X packages. The legacy bundle that used to support old browsers like IE 11 is no longer included.

Drop Webpack 4 support

Dropping old browsers support also means that we no longer transpile some features that are natively supported by modern browsers – like Nullish Coalescing and Optional Chaining.

These features are not supported by Webpack 4, so if you are using Webpack 4, you will need to transpile these features yourself or upgrade to Webpack 5.

Here is an example of how you can transpile these features on Webpack 4 using the @babel/preset-env preset:

 // webpack.config.js

 module.exports = (env) => ({
   // ...
   module: {
     rules: [
       {
         test: /\.[jt]sx?$/,
-        exclude: /node_modules/,
+        exclude: [
+          {
+            test: path.resolve(__dirname, 'node_modules'),
+            exclude: [path.resolve(__dirname, 'node_modules/@mui/x-tree-view')],
+          },
+        ],
       },
     ],
   },
 });

✅ Rename `nodeId` to `itemId`

The required nodeId prop used by the TreeItem has been renamed to itemId for consistency:

 <TreeView>
-  <TreeItem label='Item 1' nodeId='one'>
+  <TreeItem label='Item 1' itemId='one'>
 </TreeView>

The same change has been applied to the ContentComponent prop:

 const CustomContent = React.forwardRef((props, ref) => {
-  const id = props.nodeId;
+  const id = props.itemId;
   // Render some UI
 });

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

✅ 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 itemId="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 an item (rendered when this item 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
      itemId="1"
      label="Item 1"
-     expandIcon={<MyCustomExpandIcon />}
+     slots={{ expandIcon: MyCustomExpandIcon }}
    />
  </SimpleTreeView>

Define `collapseIcon`

The icon used to collapse the children of an item (rendered when this item 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
      itemId="1"
      label="Item 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
      itemId="1"
      label="Item 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
      itemId="1"
      label="Item 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
     itemId="1"
     label="Item 1"
-    TransitionComponent={Fade}
-    TransitionProps={{ timeout: 600 }}
+    slots={{ groupTransition: Fade }}
+    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:

Old name	New name
`onNodeToggle`	`onExpandedItemsChange`
`expanded`	`expandedItems`
`defaultExpanded`	`defaultExpandedItems`

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

-  expanded={expandedItems}
+  expandedItems={expandedItems}

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

If you were using the onNodeToggle prop to react to the expansion or collapse of a specific item, you can use the new onItemExpansionToggle prop which is called whenever an item is expanded or collapsed with its id and expansion status

// It is also available on the deprecated `TreeView` component
<SimpleTreeView
  onItemExpansionToggle={(event, itemId, isExpanded) =>
    console.log(itemId, isExpanded)
  }
/>

✅ Rename `onNodeSelect`, `selected`, and `defaultSelected`

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

Old name	New name
`onNodeSelect`	`onSelectedItemsChange`
`selected`	`selectedItems`
`defaultSelected`	`defaultSelectedItems`

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

-  selected={selectedItems}
+  selectedItems={selectedItems}

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

If you were using the onNodeSelect prop to react to the selection or deselection of a specific item, you can use the new onItemSelectionToggle prop which is called whenever an item is selected or deselected with its id and selection status.

// It is also available on the deprecated `TreeView` component
<SimpleTreeView
  onItemSelectionToggle={(event, itemId, isSelected) =>
    console.log(itemId, isSelected)
  }
/>

Focus the Tree Item instead of the Tree View

The focus is now applied to the Tree Item root element instead of the Tree View root element.

This change will allow new features that require the focus to be on the Tree Item, like the drag and drop reordering of items. It also solves several issues with focus management, like the inability to scroll to the focused item when a lot of items are rendered.

This will mostly impact how you write tests to interact with the Tree View:

For example, if you were writing a test with react-testing-library, here is what the changes could look like:

 it('test example on first item', () => {
   const { getByRole } = render(
     <SimpleTreeView>
       <TreeItem itemId="one" id="one">One</TreeItem>
       <TreeItem itemId="two" id="two">Two</TreeItem>
    </SimpleTreeView>
   );

   // Set the focus to the item "One"
-  const tree = getByRole('tree');
+  const treeItem = getByRole('treeitem', { name: 'One' });
   act(() => {
-    tree.focus();
+    treeItem.focus();
   });
-  fireEvent.keyDown(tree, { key: 'ArrowDown' });
+  fireEvent.keyDown(treeItem, { key: 'ArrowDown' });

  // Check if the new focused item is "Two"
- expect(tree)to.have.attribute('aria-activedescendant', 'two');
+ expect(document.activeElement).to.have.attribute('id', 'two');
 })

✅ 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.itemId);
+  const { disabled } = useTreeItemState(props.itemId);

   // Render some UI
 });

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

✅ Rename `onNodeFocus`

The onNodeFocus callback has been renamed to onItemFocus for consistency:

 <SimpleTreeView
-  onNodeFocus={onNodeFocus}
+  onItemFocus={onItemFocus}
 />

Migration from v6 to v7

Define expandIcon

Define collapseIcon

Replace parentIcon

Define endIcon

Define icon

Define `expandIcon`

Define `collapseIcon`

Replace `parentIcon`

Define `endIcon`

Define `icon`