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

2024-01-07 19:37:36

1.代码实现

 <template>
  <div class="TreePage">
    <el-checkbox
      v-model="menuExpand"
      @change="handleCheckedTreeExpand($event, 'menu')"
      >展开/折叠</el-checkbox
    >
    <el-checkbox
      v-model="menuNodeAll"
      @change="handleCheckedTreeNodeAll($event, 'menu')"
      >全选/全不选</el-checkbox
    >
    <el-checkbox
      v-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-input
            v-model="deptName"
            placeholder="请输入名称"
            clearable
            size="small"
            prefix-icon="el-icon-search"
            style="margin-bottom: 20px"
          />
        </div>
        <!-- 组织树 -->
        <div class="head-container">
          <el-tree
            ref="menu"
            :props="defaultProps"
            :default-expanded-keys="defaultExpandedKeys"
            :default-checked-keys="defaultCheckedKeys"
            :expand-on-click-node="false"
            :data="menuOptions"
            show-checkbox
            node-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-button
                  type="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

  1. default-expanded-keys: 默认展开的节点的 key 的数组;
  2. 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;
  3. 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;
  4. 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;
  5. node-click :节点被点击时的回调;
  6. accordion: 是否每次只打开一个同级树节点展开;
  7. default-expand-all: 是否默认展开所有节点 ;
  8. 通过 draggable: 属性可让节点变为可拖拽;

4. 更多属性配置查看element官网

https://element.eleme.cn/#/zh-CN/component/tree

文章来源:https://blog.csdn.net/weixin_41549971/article/details/135407829
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