谷粒商城-全栈-30 商品服务-父子组件交互及服务端接收参数获取数据

一、父子组件交互

当我们把分类功能抽取出来，封装成一个通用组件，然后在属性组调用该分类组件显示，点击分类的时候，需要把三级分类传给父组件，父组件拿到这个点击的分类ID时，然后去查表，显示到属性组页面。

/**
 * 父子组件传递数据
 * 1)、子组件给父组件传递数据，事件机制；
 *    子组件给父组件发送一个事件，携带上数据。
 * // this.$emit("事件名",携带的数据...)
 */

子组件：
src/views/modules/common/category.vue

 <template>
  <div>
    <el-input placeholder="输入关键字进行过滤" v-model="filterText"></el-input>
    <el-tree
      :data="menus"
      :props="defaultProps"
      node-key="catId"
      ref="menuTree"
      @node-click="nodeclick"
      :filter-node-method="filterNode"
      :highlight-current = "true"
    ></el-tree>
  </div>
</template>

<script>
//这里可以导入其他文件（比如：组件，工具js，第三方插件js，json文件，图片文件等等）
//例如：import 《组件名称》 from '《组件路径》';

export default {
  //import引入的组件需要注入到对象中才能使用
  components: {},
  props: {},
  data() {
    //这里存放数据
    return {
      filterText: "",
      menus: [],
      expandedKey: [],
      defaultProps: {
        children: "children",
        label: "name"
      }
    };
  },
  //计算属性 类似于data概念
  computed: {},
  //监控data中的数据变化
  watch: {
    filterText(val) {
      this.$refs.menuTree.filter(val);
    }
  },
  //方法集合
  methods: {
    //树节点过滤
    filterNode(value, data) {
      if (!value) return true;
      return data.name.indexOf(value) !== -1;
    },
    getMenus() {
      this.$http({
        url: this.$http.adornUrl("/product/category/list/tree"),
        method: "get"
      }).then(({ data }) => {
        this.menus = data.data;
      });
    },
    nodeclick(data, node, component) {
      console.log("子组件category的节点被点击", data, node, component);
      //向父组件发送事件；
      this.$emit("tree-node-click", data, node, component);
    }
  },
  //生命周期 - 创建完成（可以访问当前this实例）
  created() {
    this.getMenus();
  },
  //生命周期 - 挂载完成（可以访问DOM元素）
  mounted() {},
  beforeCreate() {}, //生命周期 - 创建之前
  beforeMount() {}, //生命周期 - 挂载之前
  beforeUpdate() {}, //生命周期 - 更新之前
  updated() {}, //生命周期 - 更新之后
  beforeDestroy() {}, //生命周期 - 销毁之前
  destroyed() {}, //生命周期 - 销毁完成
  activated() {} //如果页面有keep-alive缓存功能，这个函数会触发
};
</script>
<style scoped>

</style>

父组件
src/views/modules/product/attrgroup.vue

 <!--  -->
<template>
  <div>
    <el-row :gutter="20">
      <el-col :span="6">
        <div class="grid-content bg-purple">
          <category @tree-node-click="treenodeclick"></category>
        </div>
      </el-col>
      <el-col :span="18">
        <div class="mod-config">
          <el-form :inline="true" :model="dataForm" @keyup.enter.native="getDataList()">
            <el-form-item>
              <el-input v-model="dataForm.key" placeholder="参数名" clearable></el-input>
            </el-form-item>
            <el-form-item>
              <el-button @click="getDataList()">查询</el-button>
              <el-button type="success" @click="getAllDataList()">查询全部</el-button>
              <el-button
                v-if="isAuth('product:attrgroup:save')"
                type="primary"
                @click="addOrUpdateHandle()"
              >新增</el-button>
              <el-button
                v-if="isAuth('product:attrgroup:delete')"
                type="danger"
                @click="deleteHandle()"
                :disabled="dataListSelections.length <= 0"
              >批量删除</el-button>
            </el-form-item>
          </el-form>
          <el-table
            :data="dataList"
            border
            v-loading="dataListLoading"
            @selection-change="selectionChangeHandle"
            style="width: 100%;"
          >
            <el-table-column type="selection" header-align="center" align="center" width="50"></el-table-column>
            <el-table-column prop="attrGroupId" header-align="center" align="center" label="分组id"></el-table-column>
            <el-table-column prop="attrGroupName" header-align="center" align="center" label="组名"></el-table-column>
            <el-table-column prop="sort" header-align="center" align="center" label="排序"></el-table-column>
            <el-table-column prop="descript" header-align="center" align="center" label="描述"></el-table-column>
            <el-table-column prop="icon" header-align="center" align="center" label="组图标"></el-table-column>
            <el-table-column prop="catelogId" header-align="center" align="center" label="所属分类id"></el-table-column>
            <el-table-column
              fixed="right"
              header-align="center"
              align="center"
              width="150"
              label="操作"
            >
              <template slot-scope="scope">
                <el-button
                  type="text"
                  size="small"
                  @click="relationHandle(scope.row.attrGroupId)"
                >关联</el-button>
                <el-button
                  type="text"
                  size="small"
                  @click="addOrUpdateHandle(scope.row.attrGroupId)"
                >修改</el-button>
                <el-button type="text" size="small" @click="deleteHandle(scope.row.attrGroupId)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
          <el-pagination
            @size-change="sizeChangeHandle"
            @current-change="currentChangeHandle"
            :current-page="pageIndex"
            :page-sizes="[10, 20, 50, 100]"
            :page-size="pageSize"
            :total="totalPage"
            layout="total, sizes, prev, pager, next, jumper"
          ></el-pagination>
          <!-- 弹窗, 新增 / 修改 -->
          <add-or-update v-if="addOrUpdateVisible" ref="addOrUpdate" @refreshDataList="getDataList"></add-or-update>

          <!-- 修改关联关系 -->
          <relation-update v-if="relationVisible" ref="relationUpdate" @refreshData="getDataList"></relation-update>
        </div>
      </el-col>
    </el-row>
  </div>
</template>

<script>
/**
 * 父子组件传递数据
 * 1)、子组件给父组件传递数据，事件机制；
 *    子组件给父组件发送一个事件，携带上数据。
 * // this.$emit("事件名",携带的数据...)
 */

// 这里可以导入其他文件（比如：组件，工具js，第三方插件js，json文件，图片文件等等）
// 例如：import 《组件名称》 from '《组件路径》';
import Category from "../common/category";
import AddOrUpdate from "./attrgroup-add-or-update";
import RelationUpdate from "./attr-group-relation";

export default {
  // import引入的组件需要注入到对象中才能使用
  components: { Category, AddOrUpdate, RelationUpdate },
  props: {},
  data() {
    return {
      catId: 0,
      dataForm: {
        key: "",
      },
      dataList: [],
      pageIndex: 1,
      pageSize: 10,
      totalPage: 0,
      dataListLoading: false,
      dataListSelections: [],
      addOrUpdateVisible: false,
      relationVisible: false,
    };
  },
  activated() {
    this.getDataList();
  },
  methods: {
    // 处理分组与属性的关联
    relationHandle(groupId) {
      this.relationVisible = true;
      this.$nextTick(() => {
        this.$refs.relationUpdate.init(groupId);
      });
    },
    // 感知树节点被点击
    treenodeclick(data, node, component) {
      if (node.level == 3) {
        this.catId = data.catId;
        this.getDataList(); // 重新查询
      }
    },
    getAllDataList() {
      this.catId = 0;
      this.getDataList();
    },
    // 获取数据列表
    getDataList() {
      this.dataListLoading = true;
      this.$http({
        url: this.$http.adornUrl(`/product/attrgroup/list/${this.catId}`),
        method: "get",
        params: this.$http.adornParams({
          page: this.pageIndex,
          limit: this.pageSize,
          key: this.dataForm.key,
        }),
      }).then(({ data }) => {
        if (data && data.code === 0) {
          this.dataList = data.page.list;
          this.totalPage = data.page.totalCount;
        } else {
          this.dataList = [];
          this.totalPage = 0;
        }
        this.dataListLoading = false;
      });
    },
    // 每页数
    sizeChangeHandle(val) {
      this.pageSize = val;
      this.pageIndex = 1;
      this.getDataList();
    },
    // 当前页
    currentChangeHandle(val) {
      this.pageIndex = val;
      this.getDataList();
    },
    // 多选
    selectionChangeHandle(val) {
      this.dataListSelections = val;
    },
    // 新增 / 修改
    addOrUpdateHandle(id) {
      this.addOrUpdateVisible = true;
      this.$nextTick(() => {
        this.$refs.addOrUpdate.init(id);
      });
    },
    // 删除
    deleteHandle(id) {
      var ids = id
        ? [id]
        : this.dataListSelections.map((item) => {
            return item.attrGroupId;
          });
      this.$confirm(
        `确定对[id=${ids.join(",")}]进行[${id ? "删除" : "批量删除"}]操作?`,
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).then(() => {
        this.$http({
          url: this.$http.adornUrl("/product/attrgroup/delete"),
          method: "post",
          data: this.$http.adornData(ids, false),
        }).then(({ data }) => {
          if (data && data.code === 0) {
            this.$message({
              message: "操作成功",
              type: "success",
              duration: 1500,
              onClose: () => {
                this.getDataList();
              },
            });
          } else {
            this.$message.error(data.msg);
          }
        });
      });
    },
  },
};
</script>
<style lang='scss' scoped>
//@import url(); 引入公共css类
</style>

页面显示：

二、服务端

前端封装好参数，向后端发送请求获取数据：
http://localhost:8888/api/product/attrgroup/list/225?t=1598076577694&page=1&limit=10&key=

控制器：com/atguigu/gulimall/product/controller/AttrGroupController.java

/**
 * 属性分组
 *
 * @author kaiyi
 * @email corwienwong@gmail.com
 * @date 2020-08-10 22:03:19
 */
@RestController
@RequestMapping("product/attrgroup")
public class AttrGroupController {
    @Autowired
    private AttrGroupService attrGroupService;
/**
     * 列表
     */
    @RequestMapping("/list/{categoryId}")
    //@RequiresPermissions("product:attrgroup:list")
    public R list(@RequestParam Map<String, Object> params, @PathVariable("categoryId") Long categoryId){
        // params获取的参数是？后边拼接的参数，而categoryId是路径/带的，两者获取参数的方法不同
        // 请求的URL：http://localhost:8888/api/product/attrgroup/list/225?t=1598076577694&page=1&limit=10&key=
        // PageUtils page = attrGroupService.queryPage(params);

                // 新增接口方法（原来只传递分页参数，现在还需要带一个业务参数categoryId，所以，需要新封装接口方法）
        PageUtils page = attrGroupService.queryPage(params, categoryId);

        return R.ok().put("page", page);
    }
}

添加接口方法：com/atguigu/gulimall/product/service/AttrGroupService.java

/**
 * 属性分组
 *
 * @author kaiyi
 * @email corwienwong@gmail.com
 * @date 2020-08-10 15:45:20
 */
public interface AttrGroupService extends IService<AttrGroupEntity> {

    PageUtils queryPage(Map<String, Object> params);

    PageUtils queryPage(Map<String, Object> params, Long categoryId);
}

具体实现：com/atguigu/gulimall/product/service/impl/AttrGroupServiceImpl.java

@Service("attrGroupService")
public class AttrGroupServiceImpl extends ServiceImpl<AttrGroupDao, AttrGroupEntity> implements AttrGroupService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<AttrGroupEntity> page = this.page(
                new Query<AttrGroupEntity>().getPage(params),
                new QueryWrapper<AttrGroupEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public PageUtils queryPage(Map<String, Object> params, Long categoryId) {

        if(categoryId == 0){
            IPage<AttrGroupEntity> page = this.page(
                new Query<AttrGroupEntity>().getPage(params),
                new QueryWrapper<AttrGroupEntity>()
            );

            return new PageUtils(page);
        }else{
            String key = (String)params.get("key");

            // 构造查询语句（对于复杂的查询，需要自己构建）
            // select * from tbl where catelog_id = ? and (attr_group_id = key or attr_group_name like %key%) limit 0,10

            // QueryWrapper构造查询条件,需要查哪张表，泛型就写哪张表的实体类
            QueryWrapper<AttrGroupEntity> wrapper = new QueryWrapper<AttrGroupEntity>().eq("catelog_id", categoryId);
            if(!StringUtils.isEmpty(key)){
                wrapper.and((obj) ->{
                    obj.eq("attr_group_id", key).or().like("attr_group_name", key);
                });
            }

            // 这个方法接收两个参数，第一个是有关分页的（page,limit）,第二个是业务查询参数，然后将两者封装在一起
            IPage<AttrGroupEntity> page = this.page(
                new Query<AttrGroupEntity>().getPage(params),
                wrapper
            );

            return new PageUtils(page);
        }

    }
}

为者常成，行者常至