给角色修改权限的时候 - 后台管理系统

点击修改按钮：定于一个修改的方法，调出弹出层 ；

  async editRow(id) {
      // 获取详细信息  当前修改的角色信息  @lcick  row.id 
      const res = await getRoleInfoApi(id);
      // 弹框打开 推荐先赋值回显数据 然后打开弹窗
      this.$refs.addRole.dialogShow = true;
      // 赋给表单的formData  回显数据 
      this.$refs.addRole.formData = res;
      // 获取叶子上面的节点ID  树 tree 怎么回显，包含半钩和全钩   注意：只需要找到tree的数据的最深层的数据即可
      const menuSmallId = [];
      res.authList.forEach((item) => {
        this.getDefaultCheck(item, menuSmallId);
      });
      this.$refs.addRole.defaultCheckKeys = menuSmallId;
    },

递归函数获取最深层的选中数据 ；

 // 获取叶子上面的节点ID
    getDefaultCheck(node, arr) {
      // node是节点信息，arr是存储数组
      if (node.children && node.children.length) {
        node.children.forEach((val) => {
          this.getDefaultCheck(val, arr);
        });
      } else {
        return arr.push(node.id);
      }
    },

弹层：

<template>
  <!-- 弹框 -->
  <el-dialog
    title="添加角色"
    :visible.sync="dialogShow"
    width="40%"
    @close="closeDialog"
  >
    <!-- 表单 -->
    <el-form
      :model="formData"
      ref="formRef"
      :rules="formRules"
      label-width="90px"
      :inline="false"
      size="noraml"
    >
      <el-form-item label="角色名称" prop="name">
        <el-input v-model="formData.name"></el-input>
      </el-form-item>
      <el-form-item label="角色描述" prop="description">
        <el-input v-model="formData.description"></el-input>
      </el-form-item>
      <el-form-item label="权限">
        <!-- 展示树 -->
        <el-tree
          ref="tree"
          :data="allAuth"
          show-checkbox
          :props="{ label: 'title' }"
          node-key="id"
          :default-checked-keys="defaultCheckKeys"
        ></el-tree>
      </el-form-item>
    </el-form>
    <span slot="footer">
      <el-button size="small" @click="dialogShow = false">取消</el-button>
      <el-button size="small" @click="btnOK" type="primary">确定</el-button>
    </span>
  </el-dialog>
</template>

<script>
import { addRoleApi, editRoleApi } from '@/api/Role';
import { getMenuListApi } from '@/api/Menu';
export default {
  name: 'AddRole',
  data() {
    return {
      dialogShow: false,
      formData: {
        name: '',
        description: '',
        menuids: [], // 获取所有打钩的或半钩的数据
      },
      formRules: {
        name: [{ required: true, message: '请输入', trigger: 'blur' }],
        description: [{ required: true, message: '请输入', trigger: 'blur' }],
      },
      allAuth: [],
      defaultCheckKeys: [],
    };
  },
  mounted() {
    this.getAllMenu();
  },
  methods: {
    // 获取到所有权限
    async getAllMenu() {
      let res = await getMenuListApi();
      this.allAuth = res;
    },
    closeDialog() {
      this.formData = {
        tagname: '',
      };
      this.defaultCheckKeys = [];
      this.$refs.formRef.resetFields();
    },
    async btnOK() {
      try {
        await this.$refs.formRef.validate();
      } catch (error) {
        return console.log(error);
      }
      // 发生请求
      const checkKeys = this.$refs.tree.getCheckedKeys(); // 对钩
      const halfKeys = this.$refs.tree.getHalfCheckedKeys(); // 半钩
      this.formData.menuids = [...checkKeys, ...halfKeys]; // 整理数据
      if (this.formData.id) {
        await editRoleApi(this.formData);
      } else {
        await addRoleApi(this.formData);
      }

      this.$emit('updateList');
      this.$message.success('新增成功');
      this.dialogShow = false;
    },
  },
};
</script>

<style lang="scss" scoped></style>

回显数据的核心： :default-checked-keys="defaultCheckKeys"   默认选中的tree选项 ；