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Cascader 级联选择器（三级）

Cascader 级联选择器（三级）

江河地笑

6756人浏览 · 2022-01-18 14:55:39

江河地笑 · 2022-01-18 14:55:39 发布

业务场景

点击分组id=1修改，获得当前行的所有信息，其中所属分类id是用来控制*所属分类

这里是通过点击修改按钮获取此时的

一个分类可以有多个属性数组，一个属性分组可以有多个属性

*所属分类这里v-model绑定，调用后端接口得到数据如下

后端实现

controller层

   @RequestMapping("/info/{attrGroupId}")
    public R info(@PathVariable("attrGroupId") Long attrGroupId){
        System.out.println(attrGroupId);
//        通过groudId找到attrGroup，这是mybatis内置方法
		AttrGroupEntity attrGroup = attrGroupService.getById(attrGroupId);
        System.out.println(attrGroup);
//		通过attrGroup主体找到对应的catelogId
        Long catelogId = attrGroup.getCatelogId();

        System.out.println(catelogId);
        Long[] path = categoryService.findCatelogPath(catelogId);
        attrGroup.setCatelogPath(path);

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

service层

AttrGroupService

package com.atguigu.gulimall.product.service;

import com.baomidou.mybatisplus.extension.service.IService;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.gulimall.product.entity.AttrGroupEntity;

import java.util.Map;

/**
 * 属性分组
 *
 * @author maplechen
 * @email 1146706468@qq.com
 * @date 2021-12-26 12:23:21
 */
public interface AttrGroupService extends IService<AttrGroupEntity> {

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

Bean层

AttrGroupEntity

package com.atguigu.gulimall.product.entity;

import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;

import java.io.Serializable;
import java.util.Date;
import lombok.Data;

/**
 * 属性分组
 * 
 * @author maplechen
 * @email 1146706468@qq.com
 * @date 2021-12-26 12:23:21
 */
@Data
@TableName("pms_attr_group")
public class AttrGroupEntity implements Serializable {
	private static final long serialVersionUID = 1L;

	/**
	 * 分组id
	 */
	@TableId
	private Long attrGroupId;
	/**
	 * 组名
	 */
	private String attrGroupName;
	/**
	 * 排序
	 */
	private Integer sort;
	/**
	 * 描述
	 */
	private String descript;
	/**
	 * 组图标
	 */
	private String icon;
	/**
	 * 所属分类id
	 */
	private Long catelogId;
    //这里是分类的路径的id，例如 即[3,14,19] 前端渲染为 手机/手机通讯/手机
    //@TableField(exist = false)是数据库中不存在的列
	@TableField(exist = false)
	private Long[] catelogPath;
}

CategoryEntity

package com.atguigu.gulimall.product.entity;

import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableLogic;
import com.baomidou.mybatisplus.annotation.TableName;

import java.io.Serializable;
import java.util.Date;
import java.util.List;

import com.fasterxml.jackson.annotation.JsonInclude;
import lombok.Data;

/**
 * 商品三级分类
 * 
 * @author maplechen
 * @email 1146706468@qq.com
 * @date 2021-12-26 12:23:21
 */
@Data
@TableName("pms_category")
public class CategoryEntity implements Serializable {
	private static final long serialVersionUID = 1L;

	/**
	 * 分类id
	 */
	@TableId
	private Long catId;
	/**
	 * 分类名称
	 */
	private String name;
	/**
	 * 父分类id
	 */
	private Long parentCid;
	/**
	 * 层级
	 */
	private Integer catLevel;
	/**
	 * 是否显示[0-不显示，1显示]
	 */
	@TableLogic(value = "1",delval = "0")
	private Integer showStatus;
	/**
	 * 排序
	 */
	private Integer sort;
	/**
	 * 图标地址
	 */
	private String icon;
	/**
	 * 计量单位
	 */
	private String productUnit;
	/**
	 * 商品数量
	 */
	private Integer productCount;

	@TableField(exist=false)
    /* 不为空时返回的json才带该字段，如果是 手机/手机通讯/手机。第三级（手机）应该没有children这
字段*/
	@JsonInclude(JsonInclude.Include.NON_EMPTY) 
	private List<CategoryEntity> children;

}

CategoryService

package com.atguigu.gulimall.product.service;

import com.baomidou.mybatisplus.extension.service.IService;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.gulimall.product.entity.CategoryEntity;

import java.util.List;
import java.util.Map;

/**
 * 商品三级分类
 *
 * @author maplechen
 * @email 1146706468@qq.com
 * @date 2021-12-26 12:23:21
 */
public interface CategoryService extends IService<CategoryEntity> {

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

    List<CategoryEntity> listWithTree();

    void removeMenuByIds(List<Long> asList);

//    找到catelogId完整路径
    Long[] findCatelogPath(Long catelogId);
}

最重要是实现

Long[] path = categoryService.findCatelogPath(catelogId)；

attrGroup.setCatelogPath(path);

return R.ok().put("attrGroup", attrGroup);

思想：递归

当前第n级分类，查找是否有它的父id

若有则它的父（n-1级）在查找是否是父id

。。。

等到不满足后就退出循环

serviceImpl层

CategoryServiceImpl（核心代码）

  @Override
    public Long[] findCatelogPath(Long catelogId) {

        List<Long> paths = new ArrayList<>();
        List<Long> parentPath = findParentPath(catelogId, paths);
//        [225, 34, 2]
        Collections.reverse(parentPath);
        System.out.println(parentPath);
        return  parentPath.toArray(new Long[parentPath.size()]);
    }


    private List<Long> findParentPath(Long catelogId,List<Long> paths){
//        1。收集当前节点id
        paths.add(catelogId);
//当前id对应的分类级别是否有父，如果有则递归
        CategoryEntity byId = this.getById(catelogId);
        if(byId.getParentCid()!=0){
            findParentPath(byId.getParentCid(),paths);
        }
        return paths;
    }

前端实现

核心代码

v-model是用来显示目前得到的级别分类，例如，家用电器/厨房大件/油烟机

:options是显示所有的层级分类，这里涉及到了需要获得所有分类节点

<el-cascader filterable placeholder="试试搜索：手机" v-model="catelogPath" :options="categorys" :props="props"></el-cascader>

请求后端接口后赋值

catelogPath: [],

this.catelogPath = data.attrGroup.catelogPath;

点击修改，出现的弹框，代码如下

<template>
  <el-dialog
    :title="!dataForm.id ? '新增' : '修改'"
    :close-on-click-modal="false"
    :visible.sync="visible"
    @closed="dialogClose"
  >
    <el-form
      :model="dataForm"
      :rules="dataRule"
      ref="dataForm"
      @keyup.enter.native="dataFormSubmit()"
      label-width="120px"
    >
      <el-form-item label="组名" prop="attrGroupName">
        <el-input v-model="dataForm.attrGroupName" placeholder="组名"></el-input>
      </el-form-item>
      <el-form-item label="排序" prop="sort">
        <el-input v-model="dataForm.sort" placeholder="排序"></el-input>
      </el-form-item>
      <el-form-item label="描述" prop="descript">
        <el-input v-model="dataForm.descript" placeholder="描述"></el-input>
      </el-form-item>
      <el-form-item label="组图标" prop="icon">
        <el-input v-model="dataForm.icon" placeholder="组图标"></el-input>
      </el-form-item>
      <el-form-item label="所属分类" prop="catelogId">
        <!-- <el-input v-model="dataForm.catelogId" placeholder="所属分类id"></el-input> @change="handleChange" -->
        <el-cascader filterable placeholder="试试搜索：手机" v-model="catelogPath" :options="categorys"  :props="props"></el-cascader>
        <!-- :catelogPath="catelogPath"自定义绑定的属性，可以给子组件传值 -->
        <!-- <category-cascader :catelogPath.sync="catelogPath"></category-cascader> -->
      </el-form-item>
    </el-form>
    <span slot="footer" class="dialog-footer">
      <el-button @click="visible = false">取消</el-button>
      <el-button type="primary" @click="dataFormSubmit()">确定</el-button>
    </span>
  </el-dialog>
</template>

<script>
import CategoryCascader from '../common/category-cascader'
export default {
  data() {
    return {
      props:{
        value:"catId",
        label:"name",
        children:"children"
      },
      visible: false,
      categorys: [],
      catelogPath: [],
      dataForm: {
        attrGroupId: 0,
        attrGroupName: "",
        sort: "",
        descript: "",
        icon: "",
        catelogId: 0
      },
      dataRule: {
        attrGroupName: [
          { required: true, message: "组名不能为空", trigger: "blur" }
        ],
        sort: [{ required: true, message: "排序不能为空", trigger: "blur" }],
        descript: [
          { required: true, message: "描述不能为空", trigger: "blur" }
        ],
        icon: [{ required: true, message: "组图标不能为空", trigger: "blur" }],
        catelogId: [
          { required: true, message: "所属分类id不能为空", trigger: "blur" }
        ]
      }
    };
  },
  components:{CategoryCascader},
  
  methods: {
    dialogClose(){
      this.catelogPath = [];
    },
    getCategorys(){
      this.$http({
        url: this.$http.adornUrl("/product/category/list/tree"),
        method: "get"
      }).then(({ data }) => {
        this.categorys = data.data;
      });
    },
    init(id) {
      this.dataForm.attrGroupId = id || 0;
      this.visible = true;
      this.$nextTick(() => {
        this.$refs["dataForm"].resetFields();
        if (this.dataForm.attrGroupId) {
          this.$http({
            url: this.$http.adornUrl(
              `/product/attrgroup/info/${this.dataForm.attrGroupId}`
            ),
            method: "get",
            params: this.$http.adornParams()
          }).then(({ data }) => {
            if (data && data.code === 0) {
              this.dataForm.attrGroupName = data.attrGroup.attrGroupName;
              this.dataForm.sort = data.attrGroup.sort;
              this.dataForm.descript = data.attrGroup.descript;
              this.dataForm.icon = data.attrGroup.icon;
              this.dataForm.catelogId = data.attrGroup.catelogId;
              //查出catelogId的完整路径
              this.catelogPath =  data.attrGroup.catelogPath;
            }
          });
        }
      });
    },
    // 表单提交
    dataFormSubmit() {
      this.$refs["dataForm"].validate(valid => {
        if (valid) {
          this.$http({
            url: this.$http.adornUrl(
              `/product/attrgroup/${
                !this.dataForm.attrGroupId ? "save" : "update"
              }`
            ),
            method: "post",
            data: this.$http.adornData({
              attrGroupId: this.dataForm.attrGroupId || undefined,
              attrGroupName: this.dataForm.attrGroupName,
              sort: this.dataForm.sort,
              descript: this.dataForm.descript,
              icon: this.dataForm.icon,
              catelogId: this.catelogPath[this.catelogPath.length-1]
            })
          }).then(({ data }) => {
            if (data && data.code === 0) {
              this.$message({
                message: "操作成功",
                type: "success",
                duration: 1500,
                onClose: () => {
                  this.visible = false;
                  this.$emit("refreshDataList");
                }
              });
            } else {
              this.$message.error(data.msg);
            }
          });
        }
      });
    }
  },
  created(){
    this.getCategorys();
  }
};
</script>

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