最终实现结果

 

 

 

 

 由于element-ui没有原始api来实现这种全选，半选，所以自己写了一点

        @select="selectFun"
        @selectAll="selectAllFun"
        element-ui的原始方法

表格数据初始化

this.tableData =====> 表格数据
this.tableData.map(item => {
    this.$set(item, 'isSelect', false); //默认父级不选中
    item.children.map(childItem => {
        this.$set(childItem, 'isSelect', false); //默认子级不选中
    }
}

设置当前点击的复选框应该呈现出的状态的具体方法

setRowClickStatus(row) {
    //点击父级复选框时，当前的状态可能为半选，所以当前行状态设为false并选中，即可实现子级点全选效果
    if(row.isSelect === '') {
        row.isSelect = false;
        this.$refs.table.$refs.refTable.toggleRowSelection(row, true);//element自带事件
    }
    row.isSelect = !row.isSelect;
    //判断点击的是子级复选框还是父级复选框，如果是父级就控制子级的状态
    if(row.children) {
        //含有children字段，操作的是父级
        row.children.map(item => {
            item.isSelect = row.isSelect;
            this.$refs.table.$refs.refTable.toggleRowSelection(item, item.isSelect);
        })
    } else {
        //操作的是子级，控制父级的选中，不选中，半选
        let parentId = row.parentId; //数据中的父级id字段
        this.tableData.map(item => {
            let isAllSelect = [];
            if(item.catelogid == parentId){ //自身id匹配到点击的id相同
                item.children.map(childItem => {
                    isAllSelect.push(childItem.isSelect);
                })
                if(isAllSelect.every(slectItem => true == slectItem )){
                    item.isSelect = true;
                    this.$refs.table.$refs.refTable.toggleRowSelection(item, true);
                } else if (isAllSelect.every(selectItem => false == selectItem)){
                    item.isSelect = false;
                    this.$refs.table.$refs.refTable.toggleRowSelection(item, false);
                } else{
                    item.isSelect = ''; //半选状态
                }
            }
        })
    }
}

复选框点击事件

selectFun(selection, row) {
    this.setRowClickStatus(row);
}

点击表头全选事件

1.检测表格数据是否全选
checkIsAllSelect() {
    let oneLevelIsSelect = [];
    this.tableData.map(item => {
        oneLevelIsSelect.push(item.isSelect);
    })
    let isAllSelect = oneLevelIsSelect.every(levelItem => true == levelItem );
    retrun isAllSelect;
}


2.全选事件
selectAllFun(selection) {
    let isAllSelect = this.checkIsAllSelect();
    this.tableData.map(item => {
        item.isSelect = isAllSelect;
        this.$refs.table.$refs.refTable.toggleRowSelection(item, !isAllSelect);
        this.selectFun(selection, item);
    })
}

控制自定义的父级半选样式

1.表格父级半选样式:headerCellClassName="headerRowClassName"
headerRowClassName({ row }){
    let oneLevelIsSelect = [];
    this.tableData.map(item => {
        oneLevelIsSelect.push(item.isSelect);
    })
    if(oneLevelIsSelect.includes('')) {
        return 'indeterminate-custom';
    }
    return "";
}

2.css样式
    .indeterminate-custom {
      .el-checkbox__input {
        .el-checkbox__inner {
          background-color: #409eff !important;
          border-color: #409eff !important;
          color: #fff !important;
          &::before {
            content: '';
            position: absolute;
            display: block;
            background-color: #FFF;
            height: 2px;
            transform: scale(.5);
            left: 0;
            right: 0;
            top: 5px;
          }
          &::after {
              content: none;
          }
        }
      }
    }