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66 lines
4.6 KiB
Markdown
66 lines
4.6 KiB
Markdown
---
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category: Components
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type: Data Display
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title: Tree
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---
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## When To Use
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Almost anything can be represented in a tree structure. Examples include directories, organization hierarchies, biological classifications, countries, etc. The `Tree` component is a way of representing the hierarchical relationship between these things. You can also expand, collapse, and select a treeNode within a `Tree`.
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## API
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### Tree props
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| Property | Description | Type | Default |
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| -------- | ----------- | ---- | ------- |
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| autoExpandParent | Whether to automatically expand a parent treeNode | boolean | true |
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| checkable | Adds a `Checkbox` before the treeNodes | boolean | false |
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| checkedKeys | (Controlled) Specifies the keys of the checked treeNodes (PS: When this specifies the key of a treeNode which is also a parent treeNode, all the children treeNodes of will be checked; and vice versa, when it specifies the key of a treeNode which is a child treeNode, its parent treeNode will also be checked. When `checkable` and `checkStrictly` is true, its object has `checked` and `halfChecked` property. Regardless of whether the child or parent treeNode is checked, they won't impact each other. | string\[] \| {checked: string\[], halfChecked: string\[]} | \[] |
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| checkStrictly | Check treeNode precisely; parent treeNode and children treeNodes are not associated | boolean | false |
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| defaultCheckedKeys | Specifies the keys of the default checked treeNodes | string\[] | \[] |
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| defaultExpandAll | Whether to expand all treeNodes by default | boolean | false |
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| defaultExpandedKeys | Specify the keys of the default expanded treeNodes | string\[] | \[] |
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| defaultSelectedKeys | Specifies the keys of the default selected treeNodes | string\[] | \[] |
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| draggable | Specifies whether this Tree is draggable (IE > 8) | boolean | false |
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| expandedKeys | (Controlled) Specifies the keys of the expanded treeNodes | string\[] | \[] |
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| filterTreeNode | Defines a function to filter (highlight) treeNodes. When the function returns `true`, the corresponding treeNode will be highlighted | function(node) | - |
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| loadData | Load data asynchronously | function(node) | - |
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| multiple | Allows selecting multiple treeNodes | boolean | false |
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| selectedKeys | (Controlled) Specifies the keys of the selected treeNodes | string\[] | - |
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| showIcon | Shows the icon before a TreeNode's title. There is no default style; you must set a custom style for it if set to `true` | boolean | false |
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| showLine | Shows a connecting line | boolean | false |
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| onCheck | Callback function for when the onCheck event occurs | function(checkedKeys, e:{checked: bool, checkedNodes, node, event}) | - |
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| onDragEnd | Callback function for when the onDragEnd event occurs | function({event, node}) | - |
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| onDragEnter | Callback function for when the onDragEnter event occurs | function({event, node, expandedKeys}) | - |
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| onDragLeave | Callback function for when the onDragLeave event occurs | function({event, node}) | - |
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| onDragOver | Callback function for when the onDragOver event occurs | function({event, node}) | - |
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| onDragStart | Callback function for when the onDragStart event occurs | function({event, node}) | - |
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| onDrop | Callback function for when the onDrop event occurs | function({event, node, dragNode, dragNodesKeys}) | - |
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| onExpand | Callback function for when a treeNode is expanded or collapsed | function(expandedKeys, {expanded: bool, node}) | - |
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| onRightClick | Callback function for when the user right clicks a treeNode | function({event, node}) | - |
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| onSelect | Callback function for when the user clicks a treeNode | function(selectedKeys, e:{selected: bool, selectedNodes, node, event}) | - |
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### TreeNode props
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| Property | Description | Type | Default |
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| -------- | ----------- | ---- | ------- |
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| disableCheckbox | Disables the checkbox of the treeNode | boolean | false |
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| disabled | Disables the treeNode | boolean | false |
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| isLeaf | Determines if this is a leaf node(effective when `loadData` is specified) | boolean | false |
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| key | Used with (default)ExpandedKeys / (default)CheckedKeys / (default)SelectedKeys. P.S.: It must be unique in all of treeNodes of the tree! | string | internal calculated position of treeNode |
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| title | Title | string\|ReactNode | '---' |
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## Note
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The number of treeNodes can be very large, but when `checkable=true`,
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it will increase the compute time. So, we cache some calculations (e.g. `this.treeNodesStates`)
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to avoid double computing. But, this brings some restrictions.
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**When you load treeNodes asynchronously, you should render tree like this**:
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```jsx
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{this.state.treeData.length
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? <Tree>{this.state.treeData.map(data => <TreeNode />)}</Tree>
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: 'loading tree'}
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```
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