src\views\modules\product\category.vue

---

添加Edit按钮

    <el-tree :data="menu" :props="defaultProps" show-checkbox :expand-on-click-node="false" node-key="catId"
      :default-expanded-keys="expandKey">
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span>
		 //略......
          <el-button type="text" size="mini" @click="edit(data)">Edit</el-button>
        </span>
      </span>
    </el-tree>

---

对“确定”按钮请求进行操作判断

点击edit出现一个对话框，需要进行一个对话框的复用

    //修改分类
    edit(data) {
      this.dialogFormVisible = true;
      //略.......
    },

我们点击确定调用的是添加方法 ，现在需要调用修改方法。因此，我们需要设定一个对话框的类型：**dialogType**

export default {

  data() {
    return {
      //区分新增和编辑的类型
      dialogType: "",
  	  
      //略.......
    };
  },
}

    append(data) {
      this.dialogType = "add";
	  //略.......
    },

    //修改分类
    edit(data) {
      this.dialogType = "edit";
      //略.......
    },

点击确定按钮执行方法进行区分新增 or 修改

      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="choose">确 定</el-button>
      </div>

  methods: {

    choose() {
      if (this.dialogType == "add") {
        this.addCategory();
      } else if (this.dialogType == "edit") {
        this.editCategory();
      }
    },
  }

---

点击 “edit”触发预检请求

问题：没有数据的回显 ，那能不能用slot传进来的data呢？

显然是不行的，这是上一次查询的数据，高并发的情况下数据很可能发生了变化。调用后端代码查询数据库进行数据回显。

com.gyz.cfmall.product.controller.CategoryController#info

    /**
     * 信息
     */
    @RequestMapping("/info/{catId}")
    public R info(@PathVariable("catId") Long catId) {
        CategoryEntity category = categoryService.getById(catId);
        //数据内容放在data里
        return R.ok().put("category", category);
    }

前端代码

  methods: {
	//修改分类
    edit(data) {
      console.log("要修改的分类数据对象为:", data);
      this.dialogFormVisible = true;
      this.dialogType = "edit";
      this.$http({
        url: this.$http.adornUrl(`/product/category/info/${data.catId}`),
        method: "get",
        params: this.$http.adornParams({})
      }).then(({ data }) => {
        console.log("编辑分类得数据回显：", data);
        // 通过catId进行更新分类数据
        // data：{data}解构出来的，修改的数据赋值给category
        this.category.catId = data.category.catId;
        this.category.name = data.category.name;
        // 扩展默认菜单
        this.category.parentCid = data.category.parentCid;
        // this.category.catLevel = data.category.catLevel;
        this.category.icon = data.category.icon;
        // this.category.productUnit = data.category.productUnit;
        this.category.productCount = data.category.productCount;
      });
    },
   }

---

返回category对象

data() {
    return {
      category: {
        name: "",
        parentCid: "",
        catLevel: "",
        showStatus: 1,
        sort: 0,
        icon: "",
        productUnit: "",
        productCount: "",
      },
      ......
    };
  },

---

editCategory()方法调用后端

更新完成后将category对象置为默认值

  methods: {
    editCategory() {
      //es6语法
      let { catId, name, icon, productCount } = this.category;
      var data = {
        catId: catId,
        name: name,
        icon: icon,
        productCount: productCount
      };
      console.log("edit-data", data);
      //发送修改请求
      this.$http({
        url: this.$http.adornUrl("/product/category/update"),
        method: "post",
        data: this.$http.adornData(data, false),
      }).then(({ data }) => {
        //关闭对话框
        this.dialogFormVisible = false;
        this.$message({
          type: 'success',
          message: '修改成功'
        });
        //刷新分类数据
        this.getMenuList();
        //操作完成后分类数据展开
        this.expandKey = [this.category.parentCid];
        // 属性恢复默认值
        this.category.catId = null;
        this.category.parentCid = 0;
        this.category.catLevel = 0;
        this.category.name = "";
        this.category.icon = "";
        this.category.productUnit = "";
        this.category.productCount = 0;
      });
    },
    cancel() {
      this.dialogFormVisible = false;
      this.category.catId = null;
      this.category.parentCid = 0;
      this.category.catLevel = 0;
      this.category.name = "";
      this.category.icon = "";
      this.category.productUnit = "";
      this.category.productCount = 0;
    },
  },
}

---

动态修改title

新增或编辑操作title动态显示

:title="title"

    <el-dialog :title="title" :visible.sync="dialogFormVisible" width="30%" :close-on-click-modal="false">
	/略......
    </el-dialog>

  data() {
    return {
      title:"",
      //略......
    };
  },

  methods: {
	edit(data) {
      this.title = "商品分类修改",
    }
      
    append(data) {
      this.title = "商品分类新增",
    },      
     
     //略......
  }

---

点击 modal 关闭 Dialog

当我们不小心点到对话框外边，对话框会自动的关闭，解决如下

参考Attributes：

参数	说明	类型	可选值	默认值
close-on-click-modal	是否可以通过点击 modal 关闭 Dialog	boolean	—	true

	<el-dialog :title="title" :visible.sync="dialogFormVisible" width="30%" :close-on-click-modal="false">
	//.....
  </el-dialog>

---

前端代码

src\views\modules\product\category.vue

<!-- 三级分类页面 -->
<template>
  <div>
    <el-tree :data="menu" :props="defaultProps" show-checkbox :expand-on-click-node="false" node-key="catId"
      :default-expanded-keys="expandKey">
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span>
          <!-- 一级和二级目录才可以添加 -->
          <el-button v-if="node.level <= 2" type="text" size="mini" @click="() => append(data)">
            Append
          </el-button>
          <!-- 如果没有子节点才可以进行删除 -->
          <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="dialogFormVisible" 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"></el-input>
        </el-form-item>
        <el-form-item label="显示状态">
          <el-input v-model="category.showStatus"></el-input>
        </el-form-item>
        <el-form-item label="排序">
          <el-input v-model="category.sort"></el-input>
        </el-form-item>
        <el-form-item label="图标">
          <el-input v-model="category.icon"></el-input>
        </el-form-item>
        <el-form-item label="计量单位">
          <el-input v-model="category.productUnit"></el-input>
        </el-form-item>
        <el-form-item label="商品数量">
          <el-input v-model="category.productCount"></el-input>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="choose">确 定</el-button>
      </div>
    </el-dialog>
  </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 {

  data() {
    //这里存放数据
    return {
      title: "",
      //区分新增和编辑的类型
      dialogType: "",
      dialogFormVisible: false,
      category: {
        name: "",
        parentCid: "",
        catLevel: "",
        showStatus: 1,
        sort: 0,
        icon: "",
        productUnit: "",
        productCount: "",
      },
      menu: [],
      expandKey: [],
      defaultProps: {
        children: "children",
        label: "name"
      },
    };
  },
  //监听属性 类似于data概念
  computed: {},
  //监控data中的数据变化
  watch: {},
  //方法集合
  methods: {

    getMenuList() {
      this.dataListLoading = true;
      this.$http({
        url: this.$http.adornUrl('/product/category/list/tree'),
        method: 'get',
      }).then(({ data }) => {  // 1.使用解构即{}，将data对象解构出来
        console.log("获取三级分类数据：", data);
        // 2.将data中的data赋值给menu
        this.menu = data.data;
      });
    },

    choose() {
      if (this.dialogType == "add") {
        this.addCategory();
      } else if (this.dialogType == "edit") {
        this.editCategory();
      }
    },

    append(data) {
      console.log("append", data);
      this.title = "商品分类新增",
        this.dialogType = "add";
      this.dialogFormVisible = true;
      this.category.parentCid = data.catId;
      this.category.catLevel = data.cat_level * 1 + 1;
      console.log("append this category：", this.category);
    },

    remove(node, data) {
      var ids = [data.catId];
      // 反引号是新标准es6的功能，可以用$配合大括号来实现变量拼接
      this.$confirm(`是否删除【${data.name}】菜单?`, "提示", {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        this.$http({
          url: this.$http.adornUrl("/product/category/delete"),
          method: "post",
          data: this.$http.adornData(ids, false)
        }).then(({ data }) => {
          this.$message({
            type: 'success',
            message: '删除成功!'
          });
          this.getMenuList();
          //默认菜单展示
          this.expandKey = [node.parent.data.catId];
        });
      }).catch(() => {
        this.$message({
          type: 'info',
          message: '已取消删除'
        });
      });
      console.log("remove", node, data);
    },

    // 添加分类
    addCategory() {
      this.$http({
        url: this.$http.adornUrl("/product/category/save"),
        method: "post",
        data: this.$http.adornData(this.category, false)
      }).then(({ data }) => {
        this.dialogFormVisible = false;
        this.$message({
          type: 'success',
          message: '新增成功'
        });
        //刷新分类数据
        this.getMenuList();
        this.expandKey = [this.category.parentCid];
      }).catch({
        type: 'info',
        message: '已取消删除'
      });
    },

    //修改分类
    edit(data) {
      console.log("要修改的分类数据对象为:", data);
      this.title = "商品分类修改",
        this.dialogFormVisible = true;
      this.dialogType = "edit";
      this.$http({
        url: this.$http.adornUrl(`/product/category/info/${data.catId}`),
        method: "get",
        params: this.$http.adornParams({})
      }).then(({ data }) => {
        console.log("编辑分类得数据回显：", data);
        // 通过catId进行更新分类数据
        this.category.catId = data.category.catId;
        this.category.name = data.category.name;
        // 扩展默认菜单
        this.category.parentCid = data.category.parentCid;
        // this.category.catLevel = data.category.catLevel;
        this.category.icon = data.category.icon;
        // this.category.productUnit = data.category.productUnit;
        this.category.productCount = data.category.productCount;
      });
    },

    editCategory() {
      let { catId, name, icon, productCount } = this.category;
      var data = {
        catId: catId,
        name: name,
        icon: icon,
        productCount: productCount
      };
      console.log("edit-data", data);
      //发送修改请求
      this.$http({
        url: this.$http.adornUrl("/product/category/update"),
        method: "post",
        data: this.$http.adornData(data, false),
      }).then(({ data }) => {
        //关闭对话框
        this.dialogFormVisible = false;
        this.$message({
          type: 'success',
          message: '修改成功'
        });
        //刷新分类数据
        this.getMenuList();
        //操作完成后分类数据展开
        this.expandKey = [this.category.parentCid];
        // 属性恢复默认值
        this.category.catId = null;
        this.category.parentCid = 0;
        this.category.catLevel = 0;
        this.category.name = "";
        this.category.icon = "";
        this.category.productUnit = "";
        this.category.productCount = 0;
      });
    },
    cancel() {
      this.dialogFormVisible = false;
      this.category.catId = null;
      this.category.parentCid = 0;
      this.category.catLevel = 0;
      this.category.name = "";
      this.category.icon = "";
      this.category.productUnit = "";
      this.category.productCount = 0;
    },
  },
  //生命周期 - 创建完成（可以访问当前this实例）
  created() {
    this.getMenuList();
  },
}
</script>
<style  scoped></style>