| 1 | export type TreeNode<T = any> = T & { |
| 2 | id: number; |
| 3 | parentId: number; |
| 4 | children?: TreeNode<T>[]; |
| 5 | }; |
| 6 | |
| 7 | export type ListNode<T extends object = any> = T & { |
| 8 | id: number; |
| 9 | parentId: number; |
| 10 | }; |
| 11 | |
| 12 | export function list2Tree<T extends ListNode[]>( |
| 13 | items: T, |
| 14 | parentId: number | null = null, |
| 15 | ): TreeNode<T[number]>[] { |
| 16 | return items |
| 17 | .filter((item) => item.parentId === parentId) |
| 18 | .map((item) => { |
| 19 | const children = list2Tree(items, item.id); |
| 20 | return { |
| 21 | ...item, |
| 22 | ...(children.length ? { children } : null), |
| 23 | }; |
| 24 | }); |
| 25 | } |
| 26 | |
| 27 | /** |
| 28 | * 过滤树，返回列表数据 |
| 29 | * @param treeData |
| 30 | * @param key 用于过滤的字段 |
| 31 | * @param value 用于过滤的值 |
| 32 | */ |
| 33 | export function filterTree2List(treeData, key, value) { |
| 34 | const filterChildrenTree = (resTree, treeItem) => { |
| 35 | if (treeItem[key].includes(value)) { |
| 36 | resTree.push(treeItem); |
| 37 | return resTree; |
| 38 | } |
| 39 | if (Array.isArray(treeItem.children)) { |
| 40 | const children = treeItem.children.reduce(filterChildrenTree, []); |
| 41 | |
| 42 | const data = { ...treeItem, children }; |
| 43 | |
| 44 | if (children.length) resTree.push({ ...data }); |
| 45 | } |
| 46 | return resTree; |
| 47 | }; |
| 48 | return treeData.reduce(filterChildrenTree, []); |
| 49 | } |
| 50 | |
| 51 | /** |
| 52 | * 过滤树，并保留原有的结构 |
| 53 | * @param treeData |
| 54 | * @param predicate |
| 55 | */ |
| 56 | export function filterTree<T extends TreeNode>( |
| 57 | treeData: TreeNode<T>[], |
| 58 | predicate: (data: T) => boolean, |
| 59 | ): TreeNode<T>[] { |
| 60 | function filter(treeData: TreeNode<T>[]): TreeNode<T>[] { |
| 61 | if (!treeData?.length) return treeData; |
| 62 | |
| 63 | return treeData.filter((data) => { |
| 64 | if (!predicate(data)) return false; |
| 65 | |
| 66 | data.children = filter(data.children); |
| 67 | return true; |
| 68 | }); |
| 69 | } |
| 70 | |
| 71 | return filter(treeData) || []; |
| 72 | } |
| 73 | |
| 74 | export function deleteEmptyChildren(arr: any) { |
| 75 | arr?.forEach((node) => { |
| 76 | if (node.children?.length === 0) delete node.children; |
| 77 | else deleteEmptyChildren(node.children); |
| 78 | }); |
| 79 | } |
| 80 |