ant-design/components/tree/demo/search.md

---
order: 4
title:
  zh-CN: 可搜索
  en-US: Searchable
---

## zh-CN

可搜索的树。

## en-US

Searchable Tree.

```tsx
import { Input, Tree } from 'antd';
import type { DataNode } from 'antd/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;
```

```css
.site-tree-search-value {
  color: #f50;
}
```

<style>
[data-theme="dark"] .site-tree-search-value {
  color: #d84a1b;
}
</style>