el-tree 樹形結構數據轉換

后端返回的數據格式

 

 轉成el-tree接收的格式

 // 樹形結構數據轉換 每個元素的 children 屬性對應的 value 通過 pid 去找到，然后遞歸執行下去
    arrToTree(arr, upperDeptId = '0') {
      const res = []
      arr.forEach(item => {
        if (item.upperDeptId == upperDeptId) {
          const children = this.arrToTree(arr.filter(v => v.upperDeptId !== upperDeptId), item.id)
          if (children.length) {
            res.push({ ...item, children })
          } else {
            res.push({ ...item })
          }
        }
      })
      return res
    },

    getDeptList({ pageIndex: 1, pageSize: 1000, upperDeptId: '' }).then(res => {

        const list = res.data.list

        this.departmentList = this.arrToTree(list, '0')

 

        // 默認高亮第一個節點

        this.$nextTick(() => {

          this.$refs.deptTree.setCurrentKey(list[0].id)

        })

 

      })

 轉換后的數據格式

  方式二

/**
 * 構造樹型結構數據
 * @param {*} data 數據源
 * @param {*} id id字段 默認 'id'
 * @param {*} parentId 父節點字段 默認 'parentId'
 * @param {*} children 孩子節點字段 默認 'children'
 */
export function handleTree(data, id, parentId, children) {
  let config = {
    id: id || 'id',
    parentId: parentId || 'parentId',
    childrenList: children || 'children'
  };

  var childrenListMap = {};
  var nodeIds = {};
  var tree = [];

  for (let d of data) {
    let parentId = d[config.parentId];
    if (childrenListMap[parentId] == null) {
      childrenListMap[parentId] = [];
    }
    nodeIds[d[config.id]] = d;
    childrenListMap[parentId].push(d);
  }

  for (let d of data) {
    let parentId = d[config.parentId];
    if (nodeIds[parentId] == null) {
      tree.push(d);
    }
  }

  for (let t of tree) {
    adaptToChildrenList(t);
  }

  function adaptToChildrenList(o) {
    if (childrenListMap[o[config.id]] !== null) {
      o[config.childrenList] = childrenListMap[o[config.id]];
    }
    if (o[config.childrenList]) {
      for (let c of o[config.childrenList]) {
        adaptToChildrenList(c);
      }
    }
  }
  return tree;
}