Vue（十九）：ElementUI 扩展实现树形结构表格组件的勾父选子、半勾选、过滤出半勾选节点功能

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效果

原理分析

1. 从后端获取数据后，判断当前节点是否勾选，从而判断是否勾选子节点
2. 勾选当前节点时，子节点均勾选
3. 全勾选与半勾选与不勾选的样式处理
4. 全勾选和全取消勾选的逻辑
5. 筛选出半勾选的节点

定义变量

import {computed, nextTick, reactive, ref} from 'vue';
import {tree} from "./tree.js";// 默认节点
const tableData = reactive([{id: '节点1', hasChildren: true}, {id: '节点2', hasChildren: true},{id: '节点3', hasChildren: true}, {id: '节点4', hasChildren: true},
]);
const treeTableRef = ref();         // 表格实例
const selections = ref([]);			// 勾选节点
const childrenNodes = reactive({});	// 全部子节点
const isSelectedAll = ref(false);   // 是否勾选全部

定义是否勾选全部子节点函数

/*** 勾选子节点* @param id* @param selected*/
const selectedChildren = (id, selected) => {(childrenNodes[id] || []).forEach(row => {treeTableRef.value.toggleRowSelection(row, selected);if (id !== row.id) selectedChildren(row.id, selected);});
}

单个节点勾选函数

/*** 单个节点勾选* @param selection    选中节点集合* @param row        当前节点*/
const select = (selection, row) => {nextTick(() => {// 是否勾选当前节点下全部子节点selectedChildren(row.id, selection.some(d => d.id === row.id));});
}

从后端获取节点数据

/*** 加载子节点* @param row        当前节点* @param treeNode    节点状态* @param resolve    渲染子集函数*/
const load = (row, treeNode, resolve) => {setTimeout(() => {childrenNodes[row.id] = (tree[row.id] || []).map(d => ({...d, parentId: row.id}));resolve(childrenNodes[row.id]);// 判断当前节点是否选中,选中则自动勾选子节点nextTick(() => select(selections.value, row));}, 100);
}

全勾选、全取消勾选函数和勾选监听

/*** 全选节点勾选* @param selection    选中节点集合*/
const selectAll = (selection) => {isSelectedAll.value = !isSelectedAll.value;treeTableRef.value.data.forEach(row => {// 默认数据的勾选treeTableRef.value.toggleRowSelection(row, isSelectedAll.value);// 是否勾选全部节点下全部子节点selectedChildren(row.id, isSelectedAll.value);});
}/*** 监听节点选择事件* @param selection    选中节点集合*/
const selectionChange = (selection) => {selections.value = selection;// 勾选的节点数量为0时,设置勾选全部的状态为falsenextTick(() => ((selection.length === 0) && (isSelectedAll.value = false)));
}

表头Checkbox选中样式

/*** 表格头选中状态* @type {ComputedRef<string>}    样式选择器名称*/
const headerRowClassName = computed(() => {let count = tableData.length;for (const key in childrenNodes) {count += (childrenNodes[key] || []).length;}return (count === selections.value.length || selections.value.length === 0) ? '' : 'half-checked';
})

定义当前节点样式选择器

/*** 定义表格行样式选择器* @param row            当前节点* @param rowIndex        当前节点索引* @returns {string}    样式选择器名称*/
const rowClassName = ({row, rowIndex}) => {if (selections.value.length === 0) return '';const selectedNodeFlags = []; // 存储节点的状态/*** 筛选子节点勾选状态* @param item    当前节点*/const filterSelectedChildrenNodeFlags = (item) => {(childrenNodes[item.id] || []).forEach(node => {// 避免死循环if (item.id 

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