【项目开发】商城 - 三级分类 - 简单笔记

后端

业务类

	// 省略其他简单的CRUD

    @Override
    public List<CategoryEntity> listWithTree() {
        // 1、查出所有分类
        List<CategoryEntity> list = baseMapper.selectList(null);
        // 2. 找出所有的一级分类
        List<CategoryEntity> level1 = list.stream()
                .filter(x -> x.getParentCid() == 0)
                .peek(x -> x.setChildren(getChildren(x, list)))
                .sorted((x1, x2) -> {
                    return (x1.getSort() == null ? 0 : x1.getSort()) - (x2.getSort() == null ? 0 : x2.getSort());
                })
                .collect(Collectors.toList());
        return level1;
    }

    /**
     * 在所有的数据list里面，查出子数据root下面的数据
     * 递归查询
     *
     * @param root 子数据
     * @param list 所有的数据
     * @return
     */
    private List<CategoryEntity> getChildren(CategoryEntity root, List<CategoryEntity> list) {
        List<CategoryEntity> entities = list.stream()
                .filter(x -> x.getParentCid().equals(root.getCatId()))
                .map(x -> {
                    x.setChildren(getChildren(x, list));
                    return x;
                })
                .sorted((x1, x2) -> {
                    return (x1.getSort() == null ? 0 : x1.getSort()) - (x2.getSort() == null ? 0 : x2.getSort());
                })
                .collect(Collectors.toList());
        return entities;
    }

实体类

-- auto-generated definition
create table pms_category
(
    cat_id        bigint auto_increment comment '分类id'
        primary key,
    name          char(50)  null comment '分类名称',
    parent_cid    bigint    null comment '父分类id',
    cat_level     int       null comment '层级',
    show_status   tinyint   null comment '是否显示[0-不显示，1显示]',
    sort          int       null comment '排序',
    icon          char(255) null comment '图标地址',
    product_unit  char(50)  null comment '计量单位',
    product_count int       null comment '商品数量'
)
    comment '商品三级分类' charset = utf8mb4;

前端

<template>
  <div>

    <el-switch style="display: block" v-model="draggable" active-color="#13ce66" inactive-color="#ff4949"
      active-text="开启拖拽" inactive-text="关闭拖拽">
    </el-switch>

    <el-button type="success" @click="batchSave" v-if="draggable">批量保存</el-button>
    <el-button type="danger" @click="batchDelete">批量删除</el-button>

    <el-tree :data="menus" :props="defaultProps" :expand-on-click-node="false" show-checkbox node-key="catId"
      :default-expanded-keys="expandKey" :draggable="draggable" :allow-drop="allowDrop" @node-drop="handleDrop"
      ref="menuTree">
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span>
          <el-button v-if="node.level <= 2" type="text" size="mini" @click="() => append(data)">
            Append
          </el-button>
          <el-button v-if="node.childNodes.length == 0" type="text" size="mini" @click="() => remove(node, data)">
            Delete
          </el-button>

          <el-button type="text" size="mini" @click="() => edit(data)">
            edit
          </el-button>
        </span>
      </span>
    </el-tree>

    <el-dialog :title="title" :visible.sync="dialogVisible" width="30%" :close-on-click-modal="false">
      <el-form :model="category">
        <el-form-item label="分类名称">
          <el-input v-model="category.name" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="图标">
          <el-input v-model="category.icon" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="计量单位">
          <el-input v-model="category.productUnit" autocomplete="off"></el-input>
        </el-form-item>
      </el-form>

      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="submitData">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>


<script>
export default {
  data() {
    return {
      pCid: [],
      draggable: false,
      updateNodes: [],
      maxLevel: 0,
      title: "",
      dialogType: "",
      // 添加的实体类
      category: {
        catId: null,
        name: "",
        parentCid: 0,
        catLevel: 0,
        showStatus: 1,
        sort: 0,
        icon: "",
        productUnit: "",
      },
      dialogVisible: false,
      menus: [],
      defaultProps: {
        children: "children",
        label: "name",
      },
      expandKey: [],
    };
  },
  activated() {
    this.getMenus();
  },
  methods: {
    // 获取到当前【列表】
    getMenus() {
      this.$http({
        url: this.$http.adornUrl("/product/category/list/tree"),
        method: "get",
      }).then(({ data }) => {
        console.log("成功获取到菜单数据", data.list);
        this.menus = data.list;
      });
    },

    //  添加 提示框
    append(data) {
      // 清空数据
      this.category.name = "";
      this.category.catId = null;
      this.category.icon = "";
      this.category.productUnit = "";
      this.category.showStatus = 1;
      this.category.sort = 0;
      // 获取到需要的数据
      this.category.parentCid = data.catId;
      this.category.catLevel = data.catLevel * 1 + 1;
      // 打开 “分类信息 ” 对话框
      this.dialogVisible = true;
      console.log("打开添加的提示框:", data);
      // 设置对话框类型：add
      this.dialogType = "add";
      // 设置对话框标题：添加分类
      this.title = "添加分类";
    },

    // 修改 提示框
    edit(data) {
      console.log("当前菜单的详情", data);
      // 展示 “分类信息 ” 对话框
      this.dialogVisible = true;
      // 设置对话框类型：edit
      this.dialogType = "edit";
      // 设置对话框标题：修改分类
      this.title = "修改分类";
      // 获取到需要展示的数据:
      // 1. 发送请求获取到最新的数据
      this.$http({
        url: this.$http.adornUrl(`/product/category/info/${data.catId}`),
        method: "get",
        params: this.$http.adornParams({}),
      }).then(({ data }) => {
        console.log("需要回显的数据", data);
        this.category.name = data.category.name;
        this.category.catId = data.category.catId;
        this.category.icon = data.category.icon;
        this.category.productUnit = data.category.productUnit;
        this.category.parentCid = data.category.parentCid;
      });
    },

    // 【删除】
    remove(node, data) {
      console.log("remove", node, data);

      var ids = [data.catId];

      this.$confirm(`此操作将永久删除【${data.name}】菜单, 是否继续?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      })
        .then(() => {
          // 发送删除后端请求
          this.$http({
            url: this.$http.adornUrl("/product/category/delete"),
            method: "post",
            data: this.$http.adornData(ids, false),
          }).then(({ data }) => {
            // 发送成功：
            // 1. 弹出提示框
            this.$message({
              message: "删除成功",
              type: "success",
            });
            // 2. 删除成功以后，再获取菜单
            this.getMenus();
            // 3. 设置需要默认展开的菜单
            this.expandKey = [node.parent.data.catId];
          });
        })
        .catch(() => { });
    },

    // 【添加】
    addCategory() {
      this.$http({
        url: this.$http.adornUrl("/product/category/save"),
        method: "post",
        data: this.$http.adornData(this.category, false),
      }).then(({ data }) => {
        // 添加成功：
        // 1. 弹出提示框
        this.$message({
          message: "保存成功",
          type: "success",
        });
        // 2. 关闭对话框
        this.dialogVisible = false;
        // 2. 操作成功以后，再获取菜单
        this.getMenus();
        // 4. 设置需要默认展开的菜单
        this.expandKey = [this.category.parentCid];
      });

      console.log("添加三级分类:", this.category);
    },

    // 【修改】
    editCategory() {
      var { catId, name, icon, productUnit } = this.category;
      var data = {
        catId: catId,
        name: name,
        icon: icon,
        productUnit: productUnit,
      };
      this.$http({
        url: this.$http.adornUrl("/product/category/update"),
        method: "post",
        data: this.$http.adornData(data, false),
      }).then(({ data }) => {
        // 1. 弹出提示框
        this.$message({
          message: "修改成功",
          type: "success",
        });
        // 2. 关闭对话框
        this.dialogVisible = false;
        // 2. 操作成功以后，再获取菜单
        this.getMenus();
        // 4. 设置需要默认展开的菜单
        this.expandKey = [this.category.parentCid];
      });
    },

    // 通过不同的对话框类型 转发 不同的请求
    submitData() {
      if (this.dialogType == "add") {
        this.addCategory();
      }
      if (this.dialogType == "edit") {
        this.editCategory();
      }
    },

    // 拖拽树级节点
    allowDrop(draggingNode, dropNode, type) {
      // 1. 被拖动的当前节点以及所在的父节点总层数不能大于3
      // 1) 被拖动的当前节点总层数
      this.countNodeLevel(draggingNode);
      // 2) 当前正在拖动的节点 + 父节点所在的深度不大于3
      let deep = Math.abs(this.maxLevel - draggingNode.level) + 1;
      console.log("拖拽树级节点深度", deep);
      if (type == "inner") {
        // console.log(`this.maxLevel: ${this.maxLevel} ; draggingNode.data.catLevel : ${draggingNode.data.catLevel}; dropNode.level : ${dropNode.level}`);
        return deep + dropNode.level <= 3;
      } else {
        return deep + dropNode.parent.level <= 3;
      }
      console.log("拖拽树级节点", draggingNode, dropNode, type);
    },

    // 统计被拖动的当前节点总层数
    countNodeLevel(node) {
      // 找到所有子节点，求出最大深度
      if (node.childNodes != null && node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          if (node.childNodes[i].level > this.maxLevel) {
            this.maxLevel = node.childNodes[i].level;
          }
          this.countNodeLevel(node.childNodes[i]);
        }
      }
    },

    // 拖拽树级节点成功后的响应事件
    handleDrop(draggingNode, dropNode, dropType, ev) {
      console.log(
        "拖拽树级节点成功后的响应事件: ",
        draggingNode,
        dropNode,
        dropType
      );

      let pCid = 0;
      let siblings = null;
      // 1. 当前节点最新的父节点id
      if (dropType == "before" || dropType == "after") {
        pCid =
          dropNode.parent.data.catId == undefined
            ? 0
            : dropNode.parent.data.catId;
        siblings = dropNode.parent.childNodes;
      } else {
        pCid = dropNode.data.catId;
        siblings = dropNode.childNodes;
      }

      this.pCid.push(pCid);

      // 2. 当前节点最新的最新排序
      for (let i = 0; i < siblings.length; i++) {
        if (siblings[i].data.catId == draggingNode.data.catId) {
          // 如果遍历的是当前正在拖拽的结点
          let catLevel = draggingNode.level;
          // 拖拽子节点的等级 != 正在拖拽节点的等级
          if (siblings[i].level != draggingNode.level) {
            // 3. 当前节点的最新层级
            // 当前节点的层级发生变化
            catLevel = siblings[i].level;
            // 修改子节点层级
            this.updateChildNodeLevel(siblings[i]);
          }
          this.updateNodes.push({
            catId: siblings[i].data.catId,
            sort: i,
            parentCid: pCid,
            catLevel: catLevel,
          });
        } else {
          this.updateNodes.push({
            catId: siblings[i].data.catId,
            sort: i
          });
        }
      }
      console.log("updateNodes", this.updateNodes);
    },

    // 修改节点树层级
    updateChildNodeLevel(node) {
      if (node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          var cNode = node.childNodes[i].data;
          this.updateNodes.push({
            catId: cNode.catId,
            catLevel: node.childNodes[i].level,
          });
          this.updateChildNodeLevel(node.childNodes[i]);
        }
      }
    },

    batchSave() {
      // 4. 发送请求
      this.$http({
        url: this.$http.adornUrl('/product/category/update/sort'),
        method: 'post',
        data: this.$http.adornData(this.updateNodes, false)
      }).then(({ data }) => {
        this.$message({
          message: "修改成功",
          type: "success",
        });
        this.getMenus();
        this.expandKey = this.pCid;
        // 清空数据
        this.updateNodes = [];
        this.maxLevel = 0;
        // this.pCid = 0;
      });
    },

    // 批量删除
    batchDelete() {
      let catIds = [];
      let checkNodes = this.$refs.menuTree.getCheckedNodes();
      console.log("被选中的节点为 ", checkNodes);
      for (let i = 0; i < checkNodes.length; i++) {
        catIds.push(checkNodes[i].catId);
      }
      this.$confirm(`此操作将永久删除菜单, 是否继续?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      }).then(() => {
        this.$http({
          url: this.$http.adornUrl('/product/category/delete'),
          method: 'post',
          data: this.$http.adornData(catIds, false)
        }).then(({ data }) => {
          this.$message({
            message: "批量删除成功",
            type: "success",
          });
          this.getMenus();
        });
      }).catch(() => {

      });
    },
  },
};
</script>

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

最终实现效果

排序变化

1. 拖拽实现
2. 使用开关来表示是否开启拖拽功能
   

批量删除