Infra DesignTree
A hierarchical list structure component.
When To Use#
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.
Examples
The most basic usage, tell you how to use checkable, selectable, disabled, defaultExpandKeys, and etc.
TypeScript
JavaScript
import { Tree } from 'infrad';
import type { DataNode, TreeProps } from 'infrad/lib/tree';
import React from 'react';
const treeData: DataNode[] = [
{
title: 'parent 1',
key: '0-0',
children: [
{
title: 'parent 1-0',
key: '0-0-0',
disabled: true,
children: [
{
title: 'leaf',
key: '0-0-0-0',
disableCheckbox: true,
},
{
title: 'leaf',
key: '0-0-0-1',
},
],
},
{
title: 'parent 1-1',
key: '0-0-1',
children: [{ title: <span style={{ color: '#2673dd' }}>sss</span>, key: '0-0-1-0' }],
},
],
},
];
const App: React.FC = () => {
const onSelect: TreeProps['onSelect'] = (selectedKeys, info) => {
console.log('selected', selectedKeys, info);
};
const onCheck: TreeProps['onCheck'] = (checkedKeys, info) => {
console.log('onCheck', checkedKeys, info);
};
return (
<Tree
checkable
defaultExpandedKeys={['0-0-0', '0-0-1']}
defaultSelectedKeys={['0-0-0', '0-0-1']}
defaultCheckedKeys={['0-0-0', '0-0-1']}
onSelect={onSelect}
onCheck={onCheck}
treeData={treeData}
/>
);
};
export default App;Drag treeNode to insert after the other treeNode or insert into the other parent TreeNode.
TypeScript
JavaScript
import { Tree } from 'infrad';
import type { DataNode, TreeProps } from 'infrad/lib/tree';
import React, { useState } from 'react';
const x = 3;
const y = 2;
const z = 1;
const defaultData: DataNode[] = [];
const generateData = (_level: number, _preKey?: React.Key, _tns?: DataNode[]) => {
const preKey = _preKey || '0';
const tns = _tns || defaultData;
const children = [];
for (let i = 0; i < x; i++) {
const key = `${preKey}-${i}`;
tns.push({ title: key, key });
if (i < y) {
children.push(key);
}
}
if (_level < 0) {
return tns;
}
const level = _level - 1;
children.forEach((key, index) => {
tns[index].children = [];
return generateData(level, key, tns[index].children);
});
};
generateData(z);
const App: React.FC = () => {
const [gData, setGData] = useState(defaultData);
const [expandedKeys] = useState(['0-0', '0-0-0', '0-0-0-0']);
const onDragEnter: TreeProps['onDragEnter'] = info => {
console.log(info);
// expandedKeys 需要受控时设置
// setExpandedKeys(info.expandedKeys)
};
const onDrop: TreeProps['onDrop'] = info => {
console.log(info);
const dropKey = info.node.key;
const dragKey = info.dragNode.key;
const dropPos = info.node.pos.split('-');
const dropPosition = info.dropPosition - Number(dropPos[dropPos.length - 1]);
const loop = (
data: DataNode[],
key: React.Key,
callback: (node: DataNode, i: number, data: DataNode[]) => void,
) => {
for (let i = 0; i < data.length; i++) {
if (data[i].key === key) {
return callback(data[i], i, data);
}
if (data[i].children) {
loop(data[i].children!, key, callback);
}
}
};
const data = [...gData];
// Find dragObject
let dragObj: DataNode;
loop(data, dragKey, (item, index, arr) => {
arr.splice(index, 1);
dragObj = item;
});
if (!info.dropToGap) {
// Drop on the content
loop(data, dropKey, item => {
item.children = item.children || [];
// where to insert 示例添加到头部，可以是随意位置
item.children.unshift(dragObj);
});
} else if (
((info.node as any).props.children || []).length > 0 && // Has children
(info.node as any).props.expanded && // Is expanded
dropPosition === 1 // On the bottom gap
) {
loop(data, dropKey, item => {
item.children = item.children || [];
// where to insert 示例添加到头部，可以是随意位置
item.children.unshift(dragObj);
// in previous version, we use item.children.push(dragObj) to insert the
// item to the tail of the children
});
} else {
let ar: DataNode[] = [];
let i: number;
loop(data, dropKey, (_item, index, arr) => {
ar = arr;
i = index;
});
if (dropPosition === -1) {
ar.splice(i!, 0, dragObj!);
} else {
ar.splice(i! + 1, 0, dragObj!);
}
}
setGData(data);
};
return (
<Tree
className="draggable-tree"
defaultExpandedKeys={expandedKeys}
draggable
blockNode
onDragEnter={onDragEnter}
onDrop={onDrop}
treeData={gData}
/>
);
};
export default App;Searchable Tree.
TypeScript
JavaScript
import { Input, Tree } from 'infrad';
import type { DataNode } from 'infrad/lib/tree';
import React, { useMemo, useState } from 'react';
const { Search } = Input;
const x = 3;
const y = 2;
const z = 1;
const defaultData: DataNode[] = [];
const generateData = (_level: number, _preKey?: React.Key, _tns?: DataNode[]) => {
const preKey = _preKey || '0';
const tns = _tns || defaultData;
const children = [];
for (let i = 0; i < x; i++) {
const key = `${preKey}-${i}`;
tns.push({ title: key, key });
if (i < y) {
children.push(key);
}
}
if (_level < 0) {
return tns;
}
const level = _level - 1;
children.forEach((key, index) => {
tns[index].children = [];
return generateData(level, key, tns[index].children);
});
};
generateData(z);
const dataList: { key: React.Key; title: string }[] = [];
const generateList = (data: DataNode[]) => {
for (let i = 0; i < data.length; i++) {
const node = data[i];
const { key } = node;
dataList.push({ key, title: key as string });
if (node.children) {
generateList(node.children);
}
}
};
generateList(defaultData);
const getParentKey = (key: React.Key, tree: DataNode[]): React.Key => {
let parentKey: React.Key;
for (let i = 0; i < tree.length; i++) {
const node = tree[i];
if (node.children) {
if (node.children.some(item => item.key === key)) {
parentKey = node.key;
} else if (getParentKey(key, node.children)) {
parentKey = getParentKey(key, node.children);
}
}
}
return parentKey!;
};
const App: React.FC = () => {
const [expandedKeys, setExpandedKeys] = useState<React.Key[]>([]);
const [searchValue, setSearchValue] = useState('');
const [autoExpandParent, setAutoExpandParent] = useState(true);
const onExpand = (newExpandedKeys: string[]) => {
setExpandedKeys(newExpandedKeys);
setAutoExpandParent(false);
};
const onChange = (e: React.ChangeEvent<HTMLInputElement>) => {
const { value } = e.target;
const newExpandedKeys = dataList
.map(item => {
if (item.title.indexOf(value) > -1) {
return getParentKey(item.key, defaultData);
}
return null;
})
.filter((item, i, self) => item && self.indexOf(item) === i);
setExpandedKeys(newExpandedKeys as React.Key[]);
setSearchValue(value);
setAutoExpandParent(true);
};
const treeData = useMemo(() => {
const loop = (data: DataNode[]): DataNode[] =>
data.map(item => {
const strTitle = item.title as string;
const index = strTitle.indexOf(searchValue);
const beforeStr = strTitle.substring(0, index);
const afterStr = strTitle.slice(index + searchValue.length);
const title =
index > -1 ? (
<span>
{beforeStr}
<span className="site-tree-search-value">{searchValue}</span>
{afterStr}
</span>
) : (
<span>{strTitle}</span>
);
if (item.children) {
return { title, key: item.key, children: loop(item.children) };
}
return {
title,
key: item.key,
};
});
return loop(defaultData);
}, [searchValue]);
return (
<div>
<Search style={{ marginBottom: 8 }} placeholder="Search" onChange={onChange} />
<Tree
onExpand={onExpand}
expandedKeys={expandedKeys}
autoExpandParent={autoExpandParent}
treeData={treeData}
/>
</div>
);
};
export default App;.site-tree-search-value {
color: #f50;
}parent 1
leaf
leaf
You can customize icons for different nodes.
TypeScript
JavaScript
import {
DownOutlined,
FrownFilled,
FrownOutlined,
MehOutlined,
SmileOutlined,
} from 'infra-design-icons';
import { Tree } from 'infrad';
import type { DataNode } from 'infrad/lib/tree';
import React from 'react';
const treeData: DataNode[] = [
{
title: 'parent 1',
key: '0-0',
icon: <SmileOutlined />,
children: [
{
title: 'leaf',
key: '0-0-0',
icon: <MehOutlined />,
},
{
title: 'leaf',
key: '0-0-1',
icon: ({ selected }) => (selected ? <FrownFilled /> : <FrownOutlined />),
},
],
},
];
const App: React.FC = () => (
<Tree
showIcon
defaultExpandAll
defaultSelectedKeys={['0-0-0']}
switcherIcon={<DownOutlined />}
treeData={treeData}
/>
);
export default App;customize collapse/expand icon of tree node
TypeScript
JavaScript
import { DownOutlined } from 'infra-design-icons';
import { Tree } from 'infrad';
import type { DataNode, TreeProps } from 'infrad/lib/tree';
import React from 'react';
const treeData: DataNode[] = [
{
title: 'parent 1',
key: '0-0',
children: [
{
title: 'parent 1-0',
key: '0-0-0',
children: [
{
title: 'leaf',
key: '0-0-0-0',
},
{
title: 'leaf',
key: '0-0-0-1',
},
{
title: 'leaf',
key: '0-0-0-2',
},
],
},
{
title: 'parent 1-1',
key: '0-0-1',
children: [
{
title: 'leaf',
key: '0-0-1-0',
},
],
},
{
title: 'parent 1-2',
key: '0-0-2',
children: [
{
title: 'leaf',
key: '0-0-2-0',
},
{
title: 'leaf',
key: '0-0-2-1',
},
],
},
],
},
];
const App: React.FC = () => {
const onSelect: TreeProps['onSelect'] = (selectedKeys, info) => {
console.log('selected', selectedKeys, info);
};
return (
<Tree
showLine
switcherIcon={<DownOutlined />}
defaultExpandedKeys={['0-0-0']}
onSelect={onSelect}
treeData={treeData}
/>
);
};
export default App;Controlled mode lets parent nodes reflect the status of child nodes more intelligently.
TypeScript
JavaScript
import { Tree } from 'infrad';
import type { DataNode } from 'infrad/lib/tree';
import React, { useState } from 'react';
const treeData: DataNode[] = [
{
title: '0-0',
key: '0-0',
children: [
{
title: '0-0-0',
key: '0-0-0',
children: [
{ title: '0-0-0-0', key: '0-0-0-0' },
{ title: '0-0-0-1', key: '0-0-0-1' },
{ title: '0-0-0-2', key: '0-0-0-2' },
],
},
{
title: '0-0-1',
key: '0-0-1',
children: [
{ title: '0-0-1-0', key: '0-0-1-0' },
{ title: '0-0-1-1', key: '0-0-1-1' },
{ title: '0-0-1-2', key: '0-0-1-2' },
],
},
{
title: '0-0-2',
key: '0-0-2',
},
],
},
{
title: '0-1',
key: '0-1',
children: [
{ title: '0-1-0-0', key: '0-1-0-0' },
{ title: '0-1-0-1', key: '0-1-0-1' },
{ title: '0-1-0-2', key: '0-1-0-2' },
],
},
{
title: '0-2',
key: '0-2',
},
];
const App: React.FC = () => {
const [expandedKeys, setExpandedKeys] = useState<React.Key[]>(['0-0-0', '0-0-1']);
const [checkedKeys, setCheckedKeys] = useState<React.Key[]>(['0-0-0']);
const [selectedKeys, setSelectedKeys] = useState<React.Key[]>([]);
const [autoExpandParent, setAutoExpandParent] = useState<boolean>(true);
const onExpand = (expandedKeysValue: React.Key[]) => {
console.log('onExpand', expandedKeysValue);
// if not set autoExpandParent to false, if children expanded, parent can not collapse.
// or, you can remove all expanded children keys.
setExpandedKeys(expandedKeysValue);
setAutoExpandParent(false);
};
const onCheck = (checkedKeysValue: React.Key[]) => {
console.log('onCheck', checkedKeysValue);
setCheckedKeys(checkedKeysValue);
};
const onSelect = (selectedKeysValue: React.Key[], info: any) => {
console.log('onSelect', info);
setSelectedKeys(selectedKeysValue);
};
return (
<Tree
checkable
onExpand={onExpand}
expandedKeys={expandedKeys}
autoExpandParent={autoExpandParent}
onCheck={onCheck}
checkedKeys={checkedKeys}
onSelect={onSelect}
selectedKeys={selectedKeys}
treeData={treeData}
/>
);
};
export default App;To load data asynchronously when click to expand a treeNode.
TypeScript
JavaScript
import { Tree } from 'infrad';
import React, { useState } from 'react';
interface DataNode {
title: string;
key: string;
isLeaf?: boolean;
children?: DataNode[];
}
const initTreeData: DataNode[] = [
{ title: 'Expand to load', key: '0' },
{ title: 'Expand to load', key: '1' },
{ title: 'Tree Node', key: '2', isLeaf: true },
];
// It's just a simple demo. You can use tree map to optimize update perf.
const updateTreeData = (list: DataNode[], key: React.Key, children: DataNode[]): DataNode[] =>
list.map(node => {
if (node.key === key) {
return {
...node,
children,
};
}
if (node.children) {
return {
...node,
children: updateTreeData(node.children, key, children),
};
}
return node;
});
const App: React.FC = () => {
const [treeData, setTreeData] = useState(initTreeData);
const onLoadData = ({ key, children }: any) =>
new Promise<void>(resolve => {
if (children) {
resolve();
return;
}
setTimeout(() => {
setTreeData(origin =>
updateTreeData(origin, key, [
{ title: 'Child Node', key: `${key}-0` },
{ title: 'Child Node', key: `${key}-1` },
]),
);
resolve();
}, 1000);
});
return <Tree loadData={onLoadData} treeData={treeData} />;
};
export default App;showLine:
showIcon:
showLeafIcon:
showIcon:
showLeafIcon:
Tree with connected line between nodes, turn on by showLine, customize the preseted icon by switcherIcon.
TypeScript
JavaScript
import { CarryOutOutlined, FormOutlined } from 'infra-design-icons';
import { Switch, Tree } from 'infrad';
import type { DataNode } from 'infrad/lib/tree';
import React, { useState } from 'react';
const treeData: DataNode[] = [
{
title: 'parent 1',
key: '0-0',
icon: <CarryOutOutlined />,
children: [
{
title: 'parent 1-0',
key: '0-0-0',
icon: <CarryOutOutlined />,
children: [
{ title: 'leaf', key: '0-0-0-0', icon: <CarryOutOutlined /> },
{
title: (
<>
<div>multiple line title</div>
<div>multiple line title</div>
</>
),
key: '0-0-0-1',
icon: <CarryOutOutlined />,
},
{ title: 'leaf', key: '0-0-0-2', icon: <CarryOutOutlined /> },
],
},
{
title: 'parent 1-1',
key: '0-0-1',
icon: <CarryOutOutlined />,
children: [{ title: 'leaf', key: '0-0-1-0', icon: <CarryOutOutlined /> }],
},
{
title: 'parent 1-2',
key: '0-0-2',
icon: <CarryOutOutlined />,
children: [
{ title: 'leaf', key: '0-0-2-0', icon: <CarryOutOutlined /> },
{
title: 'leaf',
key: '0-0-2-1',
icon: <CarryOutOutlined />,
switcherIcon: <FormOutlined />,
},
],
},
],
},
{
title: 'parent 2',
key: '0-1',
icon: <CarryOutOutlined />,
children: [
{
title: 'parent 2-0',
key: '0-1-0',
icon: <CarryOutOutlined />,
children: [
{ title: 'leaf', key: '0-1-0-0', icon: <CarryOutOutlined /> },
{ title: 'leaf', key: '0-1-0-1', icon: <CarryOutOutlined /> },
],
},
],
},
];
const App: React.FC = () => {
const [showLine, setShowLine] = useState<boolean | { showLeafIcon: boolean }>(true);
const [showIcon, setShowIcon] = useState<boolean>(false);
const [showLeafIcon, setShowLeafIcon] = useState<boolean>(true);
const onSelect = (selectedKeys: React.Key[], info: any) => {
console.log('selected', selectedKeys, info);
};
const onSetLeafIcon = (checked: boolean) => {
setShowLeafIcon(checked);
setShowLine({ showLeafIcon: checked });
};
const onSetShowLine = (checked: boolean) => {
setShowLine(checked ? { showLeafIcon } : false);
};
return (
<div>
<div style={{ marginBottom: 16 }}>
showLine: <Switch checked={!!showLine} onChange={onSetShowLine} />
<br />
<br />
showIcon: <Switch checked={showIcon} onChange={setShowIcon} />
<br />
<br />
showLeafIcon: <Switch checked={showLeafIcon} onChange={onSetLeafIcon} />
</div>
<Tree
showLine={showLine}
showIcon={showIcon}
defaultExpandedKeys={['0-0-0']}
onSelect={onSelect}
treeData={treeData}
/>
</div>
);
};
export default App;parent 0
leaf 0-0
leaf 0-1
parent 1
leaf 1-0
leaf 1-1
Built-in directory tree. multiple support ctrl(Windows) / command(Mac) selection.
TypeScript
JavaScript
import { Tree } from 'infrad';
import type { DataNode, DirectoryTreeProps } from 'infrad/lib/tree';
import React from 'react';
const { DirectoryTree } = Tree;
const treeData: DataNode[] = [
{
title: 'parent 0',
key: '0-0',
children: [
{ title: 'leaf 0-0', key: '0-0-0', isLeaf: true },
{ title: 'leaf 0-1', key: '0-0-1', isLeaf: true },
],
},
{
title: 'parent 1',
key: '0-1',
children: [
{ title: 'leaf 1-0', key: '0-1-0', isLeaf: true },
{ title: 'leaf 1-1', key: '0-1-1', isLeaf: true },
],
},
];
const App: React.FC = () => {
const onSelect: DirectoryTreeProps['onSelect'] = (keys, info) => {
console.log('Trigger Select', keys, info);
};
const onExpand: DirectoryTreeProps['onExpand'] = (keys, info) => {
console.log('Trigger Expand', keys, info);
};
return (
<DirectoryTree
multiple
defaultExpandAll
onSelect={onSelect}
onExpand={onExpand}
treeData={treeData}
/>
);
};
export default App;Use virtual list through height prop.
TypeScript
JavaScript
import { Tree } from 'infrad';
import type { DataNode } from 'infrad/lib/tree';
import React from 'react';
const dig = (path = '0', level = 3) => {
const list = [];
for (let i = 0; i < 10; i += 1) {
const key = `${path}-${i}`;
const treeNode: DataNode = {
title: key,
key,
};
if (level > 0) {
treeNode.children = dig(key, level - 1);
}
list.push(treeNode);
}
return list;
};
const treeData = dig();
const App: React.FC = () => <Tree treeData={treeData} height={233} defaultExpandAll />;
export default App;API#
Tree props#
| Property | Description | Type | Default | Version |
|---|---|---|---|---|
| allowDrop | Whether to allow dropping on the node | ({ dropNode, dropPosition }) => boolean | - | |
| autoExpandParent | Whether to automatically expand a parent treeNode | boolean | false | |
| blockNode | Whether treeNode fill remaining horizontal space | boolean | false | |
| checkable | Add a Checkbox before the treeNodes | boolean | false | |
| 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[]} | [] | |
| checkStrictly | Check treeNode precisely; parent treeNode and children treeNodes are not associated | boolean | false | |
| defaultCheckedKeys | Specifies the keys of the default checked treeNodes | string[] | [] | |
| defaultExpandAll | Whether to expand all treeNodes by default | boolean | false | |
| defaultExpandedKeys | Specify the keys of the default expanded treeNodes | string[] | [] | |
| defaultExpandParent | If auto expand parent treeNodes when init | boolean | true | |
| defaultSelectedKeys | Specifies the keys of the default selected treeNodes | string[] | [] | |
| disabled | Whether disabled the tree | boolean | false | |
| draggable | Specifies whether this Tree or the node is draggable. Use icon: false to disable drag handler icon | boolean | ((node: DataNode) => boolean) | { icon?: React.ReactNode | false, nodeDraggable?: (node: DataNode) => boolean } | false | config: 4.17.0 |
| expandedKeys | (Controlled) Specifies the keys of the expanded treeNodes | string[] | [] | |
| fieldNames | Customize node title, key, children field name | object | { title: title, key: key, children: children } | 4.17.0 |
| filterTreeNode | Defines a function to filter (highlight) treeNodes. When the function returns true, the corresponding treeNode will be highlighted | function(node) | - | |
| height | Config virtual scroll height. Will not support horizontal scroll when enable this | number | - | |
| icon | Customize treeNode icon | ReactNode | (props) => ReactNode | - | |
| loadData | Load data asynchronously | function(node) | - | |
| loadedKeys | (Controlled) Set loaded tree nodes. Need work with loadData | string[] | [] | |
| multiple | Allows selecting multiple treeNodes | boolean | false | |
| rootClassName | ClassName on the root element | string | - | 4.20.0 |
| rootStyle | Style on the root element | CSSProperties | - | 4.20.0 |
| selectable | Whether can be selected | boolean | true | |
| selectedKeys | (Controlled) Specifies the keys of the selected treeNodes | string[] | - | |
| 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 | |
| showLine | Shows a connecting line | boolean | {showLeafIcon: boolean} | false | |
| switcherIcon | Customize collapse/expand icon of tree node | ReactNode | (({ expanded: boolean }) => React.ReactNode) | - | renderProps: 4.20.0 |
| titleRender | Customize tree node title render | (nodeData) => ReactNode | - | 4.5.0 |
| treeData | The treeNodes data Array, if set it then you need not to construct children TreeNode. (key should be unique across the whole array) | array<{ key, title, children, [disabled, selectable] }> | - | |
| virtual | Disable virtual scroll when set to false | boolean | true | 4.1.0 |
| onCheck | Callback function for when the onCheck event occurs | function(checkedKeys, e:{checked: bool, checkedNodes, node, event, halfCheckedKeys}) | - | |
| onDragEnd | Callback function for when the onDragEnd event occurs | function({event, node}) | - | |
| onDragEnter | Callback function for when the onDragEnter event occurs | function({event, node, expandedKeys}) | - | |
| onDragLeave | Callback function for when the onDragLeave event occurs | function({event, node}) | - | |
| onDragOver | Callback function for when the onDragOver event occurs | function({event, node}) | - | |
| onDragStart | Callback function for when the onDragStart event occurs | function({event, node}) | - | |
| onDrop | Callback function for when the onDrop event occurs | function({event, node, dragNode, dragNodesKeys}) | - | |
| onExpand | Callback function for when a treeNode is expanded or collapsed | function(expandedKeys, {expanded: bool, node}) | - | |
| onLoad | Callback function for when a treeNode is loaded | function(loadedKeys, {event, node}) | - | |
| onRightClick | Callback function for when the user right clicks a treeNode | function({event, node}) | - | |
| onSelect | Callback function for when the user clicks a treeNode | function(selectedKeys, e:{selected: bool, selectedNodes, node, event}) | - |
TreeNode props#
| Property | Description | Type | Default | |
|---|---|---|---|---|
| checkable | When Tree is checkable, set TreeNode display Checkbox or not | boolean | - | |
| disableCheckbox | Disables the checkbox of the treeNode | boolean | false | |
| disabled | Disables the treeNode | boolean | false | |
| icon | Customize icon. When you pass component, whose render will receive full TreeNode props as component props | ReactNode | (props) => ReactNode | - | |
| isLeaf | Determines if this is a leaf node(effective when loadData is specified). false will force trade TreeNode as a parent node | boolean | - | |
| 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) | |
| selectable | Set whether the treeNode can be selected | boolean | true | |
| title | Title | ReactNode | --- |
DirectoryTree props#
| Property | Description | Type | Default |
|---|---|---|---|
| expandAction | Directory open logic, optional: false | click | doubleClick | string | boolean | click |
Note#
Before 3.4.0: The number of treeNodes can be very large, but when checkable=true, it will increase the compute time. So, we cache some calculations (e.g. this.treeNodesStates) to avoid double computing. But, this brings some restrictions. When you load treeNodes asynchronously, you should render tree like this:
{
this.state.treeData.length ? (
<Tree>
{this.state.treeData.map(data => (
<TreeNode />
))}
</Tree>
) : (
'loading tree'
);
}Tree Methods#
| Name | Description |
|---|---|
| scrollTo({ key: string | number; align?: 'top' | 'bottom' | 'auto'; offset?: number }) | Scroll to key item in virtual scroll |
FAQ#
How to hide file icon when use showLine?#
File icon realize by using switcherIcon. You can overwrite the style to hide it: https://codesandbox.io/s/883vo47xp8
Why defaultExpandedAll not working on ajax data?#
default prefix prop only works when inited. So defaultExpandedAll has already executed when ajax load data. You can control expandedKeys or render Tree when data loaded to realize expanded all.
Virtual scroll limitation#
Virtual scroll only render items in visible region. Thus not support auto width (like long title with horizontal scroll).
What does disabled node work logic in the tree?#
Tree change its data by conduction. Includes checked or auto expanded, it will conduction state to parent / children node until current node is disabled. So if a controlled node is disabled, it will only modify self state and not affect other nodes. For example, a parent node contains 3 child nodes and one of them is disabled. When check the parent node, it will only check rest 2 child nodes. As the same, when check these 2 child node, parent will be checked whatever checked state the disabled one is.
This conduction logic prevent that modify disabled parent checked state by check children node and user can not modify directly with click parent which makes the interactive conflict. If you want to modify this conduction logic, you can customize it with checkStrictly prop.