基本
受控操作示例
拖动示例
异步数据加载
可搜索
连接线
自定义图标
目录
自定义展开/折叠图标
虚拟滚动
API

Tree树形控件

多层次的结构列表。

何时使用#

文件夹、组织架构、生物分类、国家地区等等，世间万物的大多数结构都是树形结构。使用 树控件 可以完整展现其中的层级关系，并具有展开收起选择等交互功能。

代码演示

parent 1

parent 1-0

leaf

parent 1-1

sss

基本

最简单的用法，展示可勾选，可选中，禁用，默认展开等功能。

TypeScript
JavaScript
import { Tree } from 'antd';

const treeData = [
  {
    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: '#1890ff' }}>sss</span>, key: '0-0-1-0' }],
      },
    ],
  },
];

const Demo = () => {
  const onSelect = (selectedKeys, info) => {
    console.log('selected', selectedKeys, info);
  };

  const 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}
    />
  );
};

ReactDOM.render(<Demo />, mountNode);

0-0

0-0-0

0-0-0-0

0-0-0-1

0-0-0-2

0-0-1

0-0-2

0-1

0-2

拖动示例

将节点拖拽到其他节点内部或前后。

import { Tree } from 'antd';

const x = 3;
const y = 2;
const z = 1;
const gData = [];

const generateData = (_level, _preKey, _tns) => {
  const preKey = _preKey || '0';
  const tns = _tns || gData;

  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);

class Demo extends React.Component {
  state = {
    gData,
    expandedKeys: ['0-0', '0-0-0', '0-0-0-0'],
  };

  onDragEnter = info => {
    console.log(info);
    // expandedKeys 需要受控时设置
    // this.setState({
    //   expandedKeys: info.expandedKeys,
    // });
  };

  onDrop = info => {
    console.log(info);
    const dropKey = info.node.props.eventKey;
    const dragKey = info.dragNode.props.eventKey;
    const dropPos = info.node.props.pos.split('-');
    const dropPosition = info.dropPosition - Number(dropPos[dropPos.length - 1]);

    const loop = (data, key, callback) => {
      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 = [...this.state.gData];

    // Find dragObject
    let dragObj;
    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 示例添加到尾部，可以是随意位置
        item.children.push(dragObj);
      });
    } else if (
      (info.node.props.children || []).length > 0 && // Has children
      info.node.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);
      });
    } else {
      let ar;
      let i;
      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);
      }
    }

    this.setState({
      gData: data,
    });
  };

  render() {
    return (
      <Tree
        className="draggable-tree"
        defaultExpandedKeys={this.state.expandedKeys}
        draggable
        blockNode
        onDragEnter={this.onDragEnter}
        onDrop={this.onDrop}
        treeData={this.state.gData}
      />
    );
  }
}

ReactDOM.render(<Demo />, mountNode);

0-0

0-1

0-2

可搜索

可搜索的树。

import { Tree, Input } from 'antd';

const { Search } = Input;

const x = 3;
const y = 2;
const z = 1;
const gData = [];

const generateData = (_level, _preKey, _tns) => {
  const preKey = _preKey || '0';
  const tns = _tns || gData;

  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 = [];
const generateList = data => {
  for (let i = 0; i < data.length; i++) {
    const node = data[i];
    const { key } = node;
    dataList.push({ key, title: key });
    if (node.children) {
      generateList(node.children);
    }
  }
};
generateList(gData);

const getParentKey = (key, tree) => {
  let parentKey;
  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;
};

class SearchTree extends React.Component {
  state = {
    expandedKeys: [],
    searchValue: '',
    autoExpandParent: true,
  };

  onExpand = expandedKeys => {
    this.setState({
      expandedKeys,
      autoExpandParent: false,
    });
  };

  onChange = e => {
    const { value } = e.target;
    const expandedKeys = dataList
      .map(item => {
        if (item.title.indexOf(value) > -1) {
          return getParentKey(item.key, gData);
        }
        return null;
      })
      .filter((item, i, self) => item && self.indexOf(item) === i);
    this.setState({
      expandedKeys,
      searchValue: value,
      autoExpandParent: true,
    });
  };

  render() {
    const { searchValue, expandedKeys, autoExpandParent } = this.state;
    const loop = data =>
      data.map(item => {
        const index = item.title.indexOf(searchValue);
        const beforeStr = item.title.substr(0, index);
        const afterStr = item.title.substr(index + searchValue.length);
        const title =
          index > -1 ? (
            <span>
              {beforeStr}
              <span className="site-tree-search-value">{searchValue}</span>
              {afterStr}
            </span>
          ) : (
            <span>{item.title}</span>
          );
        if (item.children) {
          return { title, key: item.key, children: loop(item.children) };
        }

        return {
          title,
          key: item.key,
        };
      });
    return (
      <div>
        <Search style={{ marginBottom: 8 }} placeholder="Search" onChange={this.onChange} />
        <Tree
          onExpand={this.onExpand}
          expandedKeys={expandedKeys}
          autoExpandParent={autoExpandParent}
          treeData={loop(gData)}
        />
      </div>
    );
  }
}

ReactDOM.render(<SearchTree />, mountNode);
.site-tree-search-value {
  color: #f50;
}

parent 1

leaf

自定义图标

可以针对不同的节点定制图标。

import { Tree } from 'antd';
import {
  DownOutlined,
  FrownOutlined,
  SmileOutlined,
  MehOutlined,
  FrownFilled,
} from '@ant-design/icons';

const treeData = [
  {
    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 />),
      },
    ],
  },
];

ReactDOM.render(
  <Tree
    showIcon
    defaultExpandAll
    defaultSelectedKeys={['0-0-0']}
    switcherIcon={<DownOutlined />}
    treeData={treeData}
  />,
  mountNode,
);

parent 1

parent 1-0

leaf

parent 1-1

parent 1-2

自定义展开/折叠图标

自定义展开/折叠图标。

import { Tree } from 'antd';
import { DownOutlined } from '@ant-design/icons';

class Demo extends React.Component {
  onSelect = (selectedKeys, info) => {
    console.log('selected', selectedKeys, info);
  };

  render() {
    return (
      <Tree
        showLine
        switcherIcon={<DownOutlined />}
        defaultExpandedKeys={['0-0-0']}
        onSelect={this.onSelect}
        treeData={[
          {
            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',
                  },
                ],
              },
            ],
          },
        ]}
      />
    );
  }
}

ReactDOM.render(<Demo />, mountNode);

0-0

0-0-0

0-0-0-0

0-0-0-1

0-0-0-2

0-0-1

0-0-1-0

0-0-1-1

0-0-1-2

0-0-2

0-1

0-2

受控操作示例

TypeScript
JavaScript
import React, { useState } from 'react';
import { Tree } from 'antd';

const treeData = [
  {
    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 Demo = () => {
  const [expandedKeys, setExpandedKeys] = useState<string[]>(['0-0-0', '0-0-1']);
  const [checkedKeys, setCheckedKeys] = useState<string[]>(['0-0-0']);
  const [selectedKeys, setSelectedKeys] = useState<string[]>([]);
  const [autoExpandParent, setAutoExpandParent] = useState<boolean>(true);

  const onExpand = expandedKeys => {
    console.log('onExpand', expandedKeys);
    // if not set autoExpandParent to false, if children expanded, parent can not collapse.
    // or, you can remove all expanded children keys.
    setExpandedKeys(expandedKeys);
    setAutoExpandParent(false);
  };

  const onCheck = checkedKeys => {
    console.log('onCheck', checkedKeys);
    setCheckedKeys(checkedKeys);
  };

  const onSelect = (selectedKeys, info) => {
    console.log('onSelect', info);
    setSelectedKeys(selectedKeys);
  };

  return (
    <Tree
      checkable
      onExpand={onExpand}
      expandedKeys={expandedKeys}
      autoExpandParent={autoExpandParent}
      onCheck={onCheck}
      checkedKeys={checkedKeys}
      onSelect={onSelect}
      selectedKeys={selectedKeys}
      treeData={treeData}
    />
  );
};

ReactDOM.render(<Demo />, mountNode);

Expand to load

Tree Node

异步数据加载

点击展开节点，动态加载数据。

TypeScript
JavaScript
import React, { useState } from 'react';
import { Tree } from 'antd';

interface DataNode {
  title: string;
  key: string;
  isLeaf?: boolean;
  children?: DataNode[];
}

const initTreeDate: 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.
function updateTreeData(list: DataNode[], key: React.Key, children: DataNode[]): DataNode[] {
  return list.map(node => {
    if (node.key === key) {
      return {
        ...node,
        children,
      };
    } else if (node.children) {
      return {
        ...node,
        children: updateTreeData(node.children, key, children),
      };
    }
    return node;
  });
}

const Demo: React.FC<{}> = () => {
  const [treeData, setTreeData] = useState(initTreeDate);

  function onLoadData({ key, children }) {
    return new Promise(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} />;
};

class Demo1 extends React.Component {
  state = {
    treeData: [
      { title: 'Expand to load', key: '0' },
      { title: 'Expand to load', key: '1' },
      { title: 'Tree Node', key: '2', isLeaf: true },
    ],
  };

  onLoadData = treeNode => {
    const { treeData } = this.state;
    return new Promise(resolve => {
      const { props } = treeNode;
      if (treeNode.children) {
        resolve();
        return;
      }
      setTimeout(() => {
        treeNode.children = [
          { title: 'Child Node', key: `${treeNode.eventKey}-0` },
          { title: 'Child Node', key: `${treeNode.eventKey}-1` },
        ];
        this.setState({
          treeData: [...this.state.treeData],
        });
        resolve();
      }, 1000);
    });
  };

  render() {
    return <Tree loadData={this.onLoadData} treeData={this.state.treeData} />;
  }
}

ReactDOM.render(<Demo />, mountNode);

showLine:

showIcon:

showLeafIcon:

parent 1

parent 1-0

leaf

parent 1-1

parent 1-2

parent 2

连接线

节点之间带连接线的树，常用于文件目录结构展示。使用 showLine 开启，可以用 switcherIcon 修改默认图标。

TypeScript
JavaScript
import React, { useState } from 'react';
import { Tree, Switch } from 'antd';
import { CarryOutOutlined, FormOutlined } from '@ant-design/icons';

const treeData = [
  {
    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: 'leaf', 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 Demo: React.FC<{}> = () => {
  const [showLine, setShowLine] = useState(true);
  const [showIcon, setShowIcon] = useState(false);
  const [showLeafIcon, setShowLeafIcon] = useState(true);

  const onSelect = (selectedKeys, info) => {
    console.log('selected', selectedKeys, info);
  };

  const onSetLeafIcon = checked => {
    setShowLeafIcon(checked);
    setShowLine({ showLeafIcon: checked });
  };

  const onSetShowLine = checked => {
    if (checked) {
      showLeafIcon ? setShowLine(checked) : setShowLine({ showLeafIcon });
    } else {
      setShowLine(checked);
    }
  };

  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>
  );
};

ReactDOM.render(<Demo />, mountNode);

parent 0

leaf 0-0

leaf 0-1

parent 1

leaf 1-0

leaf 1-1

内置的目录树，multiple 模式支持 ctrl(Windows) / command(Mac) 复选。

TypeScript
JavaScript
import { Tree } from 'antd';

const { DirectoryTree } = Tree;

const treeData = [
  {
    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 Demo: React.FC<{}> = () => {
  const onSelect = (keys, event) => {
    console.log('Trigger Select', keys, event);
  };

  const onExpand = () => {
    console.log('Trigger Expand');
  };

  return (
    <DirectoryTree
      multiple
      defaultExpandAll
      onSelect={onSelect}
      onExpand={onExpand}
      treeData={treeData}
    />
  );
};

ReactDOM.render(<Demo />, mountNode);

0-0

0-0-0

0-0-0-0

0-0-0-0-0

0-0-0-0-1

0-0-0-0-2

0-0-0-0-3

0-0-0-0-4

0-0-0-0-5

0-0-0-0-6

0-0-0-0-7

0-0-0-0-8

0-0-0-0-9

虚拟滚动

使用 height 属性则切换为虚拟滚动。

import { Tree } from 'antd';

function dig(path = '0', level = 3) {
  const list = [];
  for (let i = 0; i < 10; i += 1) {
    const key = `${path}-${i}`;
    const treeNode = {
      title: key,
      key,
    };

    if (level > 0) {
      treeNode.children = dig(key, level - 1);
    }

    list.push(treeNode);
  }
  return list;
}

const treeData = dig();

ReactDOM.render(<Tree treeData={treeData} height={233} defaultExpandAll />, mountNode);

API#

Tree props#

参数	说明	类型	默认值	版本
autoExpandParent	是否自动展开父节点	boolean	false
blockNode	是否节点占据一行	boolean	false
checkable	节点前添加 Checkbox 复选框	boolean	false
checkedKeys	（受控）选中复选框的树节点（注意：父子节点有关联，如果传入父节点 key，则子节点自动选中；相应当子节点 key 都传入，父节点也自动选中。当设置`checkable`和`checkStrictly`，它是一个有`checked`和`halfChecked`属性的对象，并且父子节点的选中与否不再关联	string[] \| {checked: string[], halfChecked: string[]}	[]
checkStrictly	checkable 状态下节点选择完全受控（父子节点选中状态不再关联）	boolean	false
defaultCheckedKeys	默认选中复选框的树节点	string[]	[]
defaultExpandAll	默认展开所有树节点	boolean	false
defaultExpandedKeys	默认展开指定的树节点	string[]	[]
defaultExpandParent	默认展开父节点	boolean	true
defaultSelectedKeys	默认选中的树节点	string[]	[]
disabled	将树禁用	boolean	false
draggable	设置节点可拖拽（IE>8）	boolean	false
expandedKeys	（受控）展开指定的树节点	string[]	[]
filterTreeNode	按需筛选树节点（高亮），返回 true	function(node)	-
height	设置虚拟滚动容器高度，设置后内部节点不再支持横向滚动	number	-
loadData	异步加载数据	function(node)	-
loadedKeys	（受控）已经加载的节点，需要配合 `loadData` 使用	string[]	[]
multiple	支持点选多个节点（节点本身）	boolean	false
selectable	是否可选中	boolean	true
selectedKeys	（受控）设置选中的树节点	string[]	-
showIcon	是否展示 TreeNode title 前的图标，没有默认样式，如设置为 true，需要自行定义图标相关样式	boolean	false
switcherIcon	自定义树节点的展开/折叠图标	ReactNode	-
showLine	是否展示连接线	boolean \| {showLeafIcon: boolean}	false
titleRender	自定义渲染节点	(nodeData) => ReactNode	-	4.5.0
treeData	treeNodes 数据，如果设置则不需要手动构造 TreeNode 节点（key 在整个树范围内唯一）	array<{key, title, children, [disabled, selectable]}>	-
virtual	设置 false 时关闭虚拟滚动	boolean	true	4.1.0
onCheck	点击复选框触发	function(checkedKeys, e:{checked: bool, checkedNodes, node, event, halfCheckedKeys})	-
onDragEnd	dragend 触发时调用	function({event, node})	-
onDragEnter	dragenter 触发时调用	function({event, node, expandedKeys})	-
onDragLeave	dragleave 触发时调用	function({event, node})	-
onDragOver	dragover 触发时调用	function({event, node})	-
onDragStart	开始拖拽时调用	function({event, node})	-
onDrop	drop 触发时调用	function({event, node, dragNode, dragNodesKeys})	-
onExpand	展开/收起节点时触发	function(expandedKeys, {expanded: bool, node})	-
onLoad	节点加载完毕时触发	function(loadedKeys, {event, node})	-
onRightClick	响应右键点击	function({event, node})	-
onSelect	点击树节点触发	function(selectedKeys, e:{selected: bool, selectedNodes, node, event})	-
icon	自定义树节点图标。	ReactNode \| (props) => ReactNode	-

TreeNode props#

参数	说明	类型	默认值
checkable	当树为 checkable 时，设置独立节点是否展示 Checkbox	boolean	-
disableCheckbox	禁掉 checkbox	boolean	false
disabled	禁掉响应	boolean	false
icon	自定义图标。可接收组件，props 为当前节点 props	ReactNode \| (props) => ReactNode	-
isLeaf	设置为叶子节点(设置了`loadData`时有效)	boolean	false
key	被树的 (default)ExpandedKeys / (default)CheckedKeys / (default)SelectedKeys 属性所用。注意：整个树范围内的所有节点的 key 值不能重复！	string	(内部计算出的节点位置)
selectable	设置节点是否可被选中	boolean	true
title	标题	string \| ReactNode	`---`

DirectoryTree props#

参数	说明	类型	默认值
expandAction	目录展开逻辑，可选：false \| `click` \| `doubleClick`	string \| boolean	`click`

注意#

在 3.4.0 之前：树节点可以有很多，但在设置checkable时，将会花费更多的计算时间，因此我们缓存了一些计算结果（this.treeNodesStates）来复用，避免多次重复计算，以此提高性能。但这也带来了一些限制，当你异步加载树节点时，你需要这样渲染树：

{
  this.state.treeData.length ? (
    <Tree>
      {this.state.treeData.map(data => (
        <TreeNode />
      ))}
    </Tree>
  ) : (
    'loading tree'
  );
}

Tree 方法#

名称	说明
scrollTo({ key })	虚拟滚动下，滚动到指定 key 条目

FAQ#

在 showLine 时，如何隐藏子节点图标？#

文件图标通过 switcherIcon 来实现，如果不需要你可以覆盖对应的样式：https://codesandbox.io/s/883vo47xp8

defaultExpandedAll 在异步加载数据时为何不生效？#

default 前缀属性只有在初始化时生效，因而异步加载数据时 defaultExpandedAll 已经执行完成。你可以通过受控 expandedKeys 或者在数据加载完成后渲染 Tree 来实现全部展开。

虚拟滚动的限制#

虚拟滚动通过在仅渲染可视区域的元素来提升渲染性能。但是同时由于不会渲染所有节点，所以无法自动拓转横向宽度（比如超长 title 的横向滚动条）。