谷粒商城-全栈-20 商品服务-三级分类-添加编辑和拖拽

这一节实现三级分类的添加，编辑，拖拽，批量保存、批量删除功能。

一、添加和编辑实现

添加和编辑功能页面开发基本类似，共用表单，所以，这里一起处理，这里要注意data属性默认值的处理。
大概思路：点击添加按钮，进入append事件响应方法并且传递表单对应的data值，然后表单显示属性为true，并且对category对象赋初值，弹出表单，填入数据，提交按钮，调用对应的添加方法，根据表单双向绑定原理，填入的数据已经动态绑定到 category 对象上了，所以，在提交的方法中，只需通过 this.category 获取对象值即可。添加数据，调用添加api,添加成功后，给出添加成功的提示信息，关闭表单显示，刷新菜单，然后设置需要默认展开的菜单。

由于添加和编辑共用表单，所以，这里做了一个抽取，表单 title, submit 方法共用，根据dialogType属性来区分。

前端页面：src/views/modules/product/category.vue

<!-- 分类 -->
<template>
  <div>
    <el-tree
      :data="menus"
      :props="defaultProps"
      :expand-on-click-node="false"
      show-checkbox
      node-key="catId"
      :default-expanded-keys="expendedKey"
    >
      <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 type="text" size="mini" @click="edit(data)">edit</el-button>
          <el-button
            v-if="node.childNodes.length == 0"
            type="text"
            size="mini"
            @click="() => remove(node, data)"
          >Delete</el-button>
        </span>
      </span>
    </el-tree>

    <el-dialog :title="title" :visible.sync="dialogFormVisible" width="30%">
      <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>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="submitData">确 定</el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
// import userVue from '../sys/user.vue'
// 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 () {
    return {
      category: {
        name: '',
        parentCid: 0,
        catLevel: 0,
        showStatus: 1,
        sort: 0,
        productUnit: '',
        icon: '',
        catId: null
      },
      menus: [],
      expendedKey: [],
      defaultProps: {
        children: 'children',
        label: 'name'
      },
      dialogFormVisible: false,
      dialogVisible: false,
      dialogType: '',
      title: '',

      formLabelWidth: '120px'
    }
  },
  // 监听属性 类似于data概念
  computed: {},
  // 监控data中的数据变化
  watch: {},
  methods: {
    getMenus () {
      this.$http({
        url: this.$http.adornUrl('/product/category/list/tree'),
        method: 'get'
      }).then(({ data }) => {
        this.menus = data.data
      })
    },
    append (data) {
      console.log('append', data)
      this.dialogType = 'add'
      this.title = '添加分类'
      this.dialogFormVisible = true
      this.category.parentCid = data.catId
      this.category.catLevel = data.catLevel * 1 + 1
      this.category.catId = null
      this.category.name = ''
      this.category.icon = ''
      this.category.productUnit = ''
      this.category.sort = 0
      this.category.showStatus = 1
    },
    addCategory () {
      console.log('提交的三级分类数据', this.category)

      this.$http({
        url: this.$http.adornUrl('/product/category/save'),
        method: 'post',
        // eslint-disable-next-line no-undef
        data: this.$http.adornData(this.category, false)
      }).then(({ data }) => {
        this.$message({
          message: '菜单保存成功',
          type: 'success'
        })
        // 关闭对话框
        this.dialogVisible = false
        // 刷新出新的菜单
        this.getMenus()
        // 设置需要默认展开的菜单
        this.expendedKey = [this.category.parentCid]
      })
    },
    edit (data) {
      this.dialogFormVisible = true
      console.log('要修改的数据', data)
      this.dialogType = 'edit'
      this.title = '修改分类'

      // 发送请求获取当前节点的最新数据显示在页面（不能用页面显示的数据，可能该数据已经被其他人改了，和数据库数据不一致了）
      this.$http({
        url: this.$http.adornUrl(`/product/category/info/${data.catId}`),
        method: 'get'
      }).then(({ data }) => {
        // 请求成功
        console.log('要回显的数据', data)
        this.category.name = data.data.name
        this.category.catId = data.data.catId
        this.category.icon = data.data.icon
        this.category.productUnit = data.data.productUnit
        this.category.parentCid = data.data.parentCid
        this.category.catLevel = data.data.catLevel
        this.category.sort = data.data.sort
        this.category.showStatus = data.data.showStatus
        /**
         *         parentCid: 0,
        catLevel: 0,
        showStatus: 1,
        sort: 0,
         */
      })
    },
    submitData () {
      if (this.dialogType === 'add') {
        this.addCategory()
      }
      if (this.dialogType === 'edit') {
        this.editCategory()
      }
    },
      // 修改三级分类数据
    editCategory () {
      // 析构方法，对象可以直接复制到变量
      var { catId, name, icon, productUnit } = this.category
      this.$http({
        url: this.$http.adornUrl('/product/category/update'),
        method: 'post',
        // 如果传递的对象 key和value一样，则key可以省略掉
        // data: this.$http.adornData({catId:catId, name:name, icon:icon, productUnit:productUnit})
        data: this.$http.adornData({ catId, name, icon, productUnit }, false)
      }).then(({ data }) => {
        this.$message({
          message: '菜单修改成功',
          type: 'success'
        })
        // 关闭对话框
        this.dialogVisible = false
        // 刷新出新的菜单
        this.getMenus()
        // 设置需要默认展开的菜单
        this.expandedKey = [this.category.parentCid]
      })
    },

    remove (node, data) {
      var ids = [data.catId]
      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({
              message: '菜单删除成功', // 菜单删除成功仍然要展示父节点
              type: 'success'
            })

            // 重新刷新页面
            this.getMenus()
            // 设置需要默认展开的菜单
            this.expendedKey = [node.parent.data.catId]
          })
        })
        .catch(() => {})
    }
  },
  // 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>
</style>

二、拖拽和批量操作实现

前端页面：src/views/modules/product/category.vue

<template>
  <div>
    <el-switch v-model="draggable" active-text="开启拖拽" inactive-text="关闭拖拽"></el-switch>
    <el-button v-if="draggable" @click="batchSave">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="expandedKey"
      :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 type="text" size="mini" @click="edit(data)">edit</el-button>
          <el-button
            v-if="node.childNodes.length==0"
            type="text"
            size="mini"
            @click="() => remove(node, data)"
          >Delete</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>
//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() {
    return {
      pCid: [],
      draggable: false,
      updateNodes: [],
      maxLevel: 0,
      title: "",
      dialogType: "", //edit,add
      category: {
        name: "",
        parentCid: 0,
        catLevel: 0,
        showStatus: 1,
        sort: 0,
        productUnit: "",
        icon: "",
        catId: null
      },
      dialogVisible: false,
      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: {},
  //方法集合
  methods: {
    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.data);
        this.menus = data.data;
      });
    },
    batchDelete() {
      let catIds = [];
      let checkedNodes = this.$refs.menuTree.getCheckedNodes();
      console.log("被选中的元素", checkedNodes);
      for (let i = 0; i < checkedNodes.length; i++) {
        catIds.push(checkedNodes[i].catId);
      }
      this.$confirm(`是否批量删除【${catIds}】菜单?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning"
      })
        .then(() => {
          this.$http({
            url: this.$http.adornUrl("/product/category/delete"),
            method: "post",
            data: this.$http.adornData(catIds, false)
          }).then(({ data }) => {
            this.$message({
              message: "菜单批量删除成功",
              type: "success"
            });
            this.getMenus();
          });
        })
        .catch(() => {});
    },
    batchSave() {
      this.$http({
        url: this.$http.adornUrl("/product/category/update/sort"),
        method: "post",
        data: this.$http.adornData(this.updateNodes, false)
      }).then(({ data }) => {
        this.$message({
          message: "菜单顺序等修改成功",
          type: "success"
        });
        //刷新出新的菜单
        this.getMenus();
        //设置需要默认展开的菜单
        this.expandedKey = this.pCid;
        this.updateNodes = [];
        this.maxLevel = 0;
        // this.pCid = 0;
      });
    },
    handleDrop(draggingNode, dropNode, dropType, ev) {
      console.log("handleDrop: ", draggingNode, dropNode, dropType);
      //1、当前节点最新的父节点id
      let pCid = 0;
      let siblings = null;
      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、当前拖拽节点的最新顺序，
      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节点
          let catLevel = draggingNode.level;
          if (siblings[i].level != draggingNode.level) {
            //当前节点的层级发生变化
            catLevel = siblings[i].level;
            //修改他子节点的层级
            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 });
        }
      }

      //3、当前拖拽节点的最新层级
      console.log("updateNodes", this.updateNodes);
    },
    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]);
        }
      }
    },
    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
      console.log("allowDrop:", draggingNode, dropNode, type);
      //
      this.countNodeLevel(draggingNode);
      //当前正在拖动的节点+父节点所在的深度不大于3即可
      let deep = Math.abs(this.maxLevel - draggingNode.level) + 1;
      console.log("深度：", deep);

      //   this.maxLevel
      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;
      }
    },
    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]);
        }
      }
    },
    edit(data) {
      console.log("要修改的数据", data);
      this.dialogType = "edit";
      this.title = "修改分类";
      this.dialogVisible = true;

      //发送请求获取当前节点最新的数据
      this.$http({
        url: this.$http.adornUrl(`/product/category/info/${data.catId}`),
        method: "get"
      }).then(({ data }) => {
        //请求成功
        console.log("要回显的数据", data);
        this.category.name = data.data.name;
        this.category.catId = data.data.catId;
        this.category.icon = data.data.icon;
        this.category.productUnit = data.data.productUnit;
        this.category.parentCid = data.data.parentCid;
        this.category.catLevel = data.data.catLevel;
        this.category.sort = data.data.sort;
        this.category.showStatus = data.data.showStatus;
        /**
         *         parentCid: 0,
        catLevel: 0,
        showStatus: 1,
        sort: 0,
         */
      });
    },
    append(data) {
      console.log("append", data);
      this.dialogType = "add";
      this.title = "添加分类";
      this.dialogVisible = true;
      this.category.parentCid = data.catId;
      this.category.catLevel = data.catLevel * 1 + 1;
      this.category.catId = null;
      this.category.name = "";
      this.category.icon = "";
      this.category.productUnit = "";
      this.category.sort = 0;
      this.category.showStatus = 1;
    },

    submitData() {
      if (this.dialogType == "add") {
        this.addCategory();
      }
      if (this.dialogType == "edit") {
        this.editCategory();
      }
    },
    //修改三级分类数据
    editCategory() {
      var { catId, name, icon, productUnit } = this.category;
      this.$http({
        url: this.$http.adornUrl("/product/category/update"),
        method: "post",
        data: this.$http.adornData({ catId, name, icon, productUnit }, false)
      }).then(({ data }) => {
        this.$message({
          message: "菜单修改成功",
          type: "success"
        });
        //关闭对话框
        this.dialogVisible = false;
        //刷新出新的菜单
        this.getMenus();
        //设置需要默认展开的菜单
        this.expandedKey = [this.category.parentCid];
      });
    },
    //添加三级分类
    addCategory() {
      console.log("提交的三级分类数据", this.category);
      this.$http({
        url: this.$http.adornUrl("/product/category/save"),
        method: "post",
        data: this.$http.adornData(this.category, false)
      }).then(({ data }) => {
        this.$message({
          message: "菜单保存成功",
          type: "success"
        });
        //关闭对话框
        this.dialogVisible = false;
        //刷新出新的菜单
        this.getMenus();
        //设置需要默认展开的菜单
        this.expandedKey = [this.category.parentCid];
      });
    },

    remove(node, data) {
      var ids = [data.catId];
      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({
              message: "菜单删除成功",
              type: "success"
            });
            //刷新出新的菜单
            this.getMenus();
            //设置需要默认展开的菜单
            this.expandedKey = [node.parent.data.catId];
          });
        })
        .catch(() => {});

      console.log("remove", node, data);
    }
  },
  //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>

为者常成，行者常至