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3.7 KiB
3.7 KiB
order | title | ||||
---|---|---|---|---|---|
4 |
|
zh-CN
可搜索的树。
en-US
Searchable Tree.
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>{item.title}</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;
}