element中Tree 树形控件实现多选、展开折叠、全选全不选、父子联动、默认展开、默认选中、默认禁用、自定义节点内容、可拖拽节点、手风琴模式-编程知识

1.代码实现

 <template><div class="TreePage"><el-checkboxv-model="menuExpand"@change="handleCheckedTreeExpand($event, 'menu')">展开/折叠</el-checkbox><el-checkboxv-model="menuNodeAll"@change="handleCheckedTreeNodeAll($event, 'menu')">全选/全不选</el-checkbox><el-checkboxv-model="menuCheckStrictly"@change="handleCheckedTreeConnect($event, 'menu')">父子联动</el-checkbox><el-row :gutter="20" style="margin-top: 20px"><!--村数据--><el-col :span="24"><div class="head-container"><el-inputv-model="deptName"placeholder="请输入名称"clearablesize="small"prefix-icon="el-icon-search"style="margin-bottom: 20px"/></div><!-- 组织树 --><div class="head-container"><el-treeref="menu":props="defaultProps":default-expanded-keys="defaultExpandedKeys":default-checked-keys="defaultCheckedKeys":expand-on-click-node="false":data="menuOptions"show-checkboxnode-key="deptId":check-strictly="!menuCheckStrictly"empty-text="加载中，请稍后":filter-node-method="filterNode"@node-click="handleNodeClick"draggable@node-drag-start="handleDragStart"@node-drag-enter="handleDragEnter"@node-drag-leave="handleDragLeave"@node-drag-over="handleDragOver"@node-drag-end="handleDragEnd"@node-drop="handleDrop":allow-drop="allowDrop":allow-drag="allowDrag"><!--自定义节点内容: 使用 scoped slot 会传入两个参数node和data，分别表示当前节点的 Node 对象和当前节点的数据。 --><span class="custom-tree-node" slot-scope="{ node, data }"><span>{{ node.label }}</span><span><el-button type="text" size="mini" @click="() => append(data)">新增</el-button><el-buttontype="text"size="mini"@click="() => remove(node, data)">删除</el-button></span></span></el-tree></div></el-col></el-row><el-button type="primary" @click="submitForm">确 定</el-button></div>
</template><script>
let deptId = 10000;
export default {name: "TreePage2",props: {},data() {return {menuExpand: false,menuNodeAll: false,menuCheckStrictly: true,// 模拟数据menuOptions: [{deptId: 100,parentId: 0,parentName: null,ancestors: "0",deptName: "XX01街道",children: [{deptId: 1001,parentId: 100,parentName: null,ancestors: "0,100",deptName: "XX1-1村",children: [{deptId: 10011,parentId: 1001,parentName: null,ancestors: "0,100,1001",deptName: "XX1-1-1村",children: [],},],},{deptId: 1002,parentId: 100,parentName: null,ancestors: "0,100",deptName: "XX1-2村",children: [{deptId: 10021,parentId: 1002,parentName: null,ancestors: "0,100,1002",deptName: "XX1-2-1村",children: [],disabled: true, //禁用},],},{deptId: 1003,parentId: 100,parentName: null,ancestors: "0,100",deptName: "XX1-3村",children: [],},],},{deptId: 200,parentId: 0,parentName: null,ancestors: "0",deptName: "XX02街道",children: [{deptId: 2001,parentId: 200,parentName: null,ancestors: "0,200",deptName: "XX2-1村",children: [],},{deptId: 2002,parentId: 200,parentName: null,ancestors: "0,200",deptName: "XX2-2村",children: [],},{deptId: 2003,parentId: 200,parentName: null,ancestors: "0,200",deptName: "XX2-3村",children: [],},],},],// 村名称deptName: undefined,defaultProps: {children: "children",label: "deptName",},// 默认展开的节点的 key 的数组defaultExpandedKeys: [100, 10021],// 默认展开的节点的 选中 的数组defaultCheckedKeys: [1001],};},watch: {// 在需要对节点进行过滤时，调用 Tree 实例的filter方法，参数为关键字。// 需要注意的是，此时需要设置filter-node-method，值为过滤函数。// 根据名称筛选村社树deptName(val) {this.$refs.menu.filter(val);},},methods: {// 树权限（展开/折叠）handleCheckedTreeExpand(value) {let treeList = this.menuOptions;for (let i = 0; i < treeList.length; i++) {this.$refs.menu.store.nodesMap[treeList[i].deptId].expanded = value;}},// 树权限（全选/全不选）handleCheckedTreeNodeAll(value) {this.$refs.menu.setCheckedNodes(value ? this.menuOptions : []);},// 树权限（父子联动）handleCheckedTreeConnect(value) {this.menuCheckStrictly = value ? true : false;},// 过滤函数filterNode(value, data) {// console.log(value, data)if (!value) return true;return data.deptName.indexOf(value) !== -1;},// 左侧网格树-节点单击事件handleNodeClick(data) {console.log(data, "左侧网格树-节点单击事件");},// 所有菜单节点数据getMenuAllCheckedKeys() {// 目前被选中的菜单节点let checkedKeys = this.$refs.menu.getCheckedKeys();// 半选中的菜单节点let halfCheckedKeys = this.$refs.menu.getHalfCheckedKeys();checkedKeys.unshift.apply(checkedKeys, halfCheckedKeys);return checkedKeys;},// 新增节点append(data) {const newChild = { deptId: deptId++, deptName: "test", children: [] };if (!data.children) {this.$set(data, "children", []);}data.children.push(newChild);},// 删除节点remove(node, data) {const parent = node.parent;const children = parent.data.children || parent.data;const index = children.findIndex((d) => d.deptId === data.deptId);children.splice(index, 1);},// 节点开始拖拽时触发的事件handleDragStart(node, ev) {console.log("drag start", node,ev);},//   拖拽进入其他节点时触发的事件handleDragEnter(draggingNode, dropNode, ev) {console.log("tree drag enter: ", dropNode.deptName,ev);},//   拖拽离开某个节点时触发的事件handleDragLeave(draggingNode, dropNode, ev) {console.log("tree drag leave: ", dropNode.deptName,ev);},//   在拖拽节点时触发的事件（类似浏览器的 mouseover 事件）handleDragOver(draggingNode, dropNode, ev) {console.log("tree drag over: ", dropNode.deptName,ev);},//   拖拽结束时（可能未成功）触发的事件handleDragEnd(draggingNode, dropNode, dropType, ev) {console.log("tree drag end: ", dropNode && dropNode.deptName, dropType,ev);},//   拖拽成功完成时触发的事件handleDrop(draggingNode, dropNode, dropType, ev) {console.log("tree drop: ", dropNode.deptName, dropType,ev);},//   拖拽时判定目标节点能否被放置。type 参数有三种情况：'prev'、'inner' 和 'next'，// 分别表示放置在目标节点前、插入至目标节点和放置在目标节点后allowDrop(draggingNode, dropNode, type) {if (dropNode.data.deptName === "XX1-1-1村") {return type !== "inner";} else {return true;}},//   判断节点能否被拖拽allowDrag(draggingNode) {return draggingNode.data.deptName.indexOf("XX1-2-1村") === -1;},/** 提交按钮 */submitForm() {let menuIds = this.getMenuAllCheckedKeys();console.log(menuIds, "menuIds");},},
};
</script><style scoped>
.custom-tree-node {flex: 1;display: flex;align-items: center;justify-content: space-between;font-size: 14px;padding-right: 8px;
}
</style>

2. 效果图

在这里插入图片描述

3. 使用到的部分属性说明

default-expanded-keys：默认展开的节点的 key 的数组；
expand-on-click-node：是否在点击节点的时候展开或者收缩节点，默认值为 true，如果为 false，则只有点箭头图标的时候才会展开或者收缩节点；
node-key ：每个树节点用来作为唯一标识的属性，整棵树应该是唯一的；
filter-node-method：对树节点进行筛选时执行的方法，返回 true 表示这个节点可以显示，返回 false 则表示这个节点会被隐藏；
node-click ：节点被点击时的回调；
accordion：是否每次只打开一个同级树节点展开；
default-expand-all：是否默认展开所有节点；
通过 draggable：属性可让节点变为可拖拽；