前端学习之vue+element-ui电商项目（六）分类参数

0. 准备工作

component下新建文件夹goods下新建文件Params.vue，并在路由中引入文件。

1.界面布局

1.1 界面样式

1.2 界面导航

<el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

<!-- 卡片视图的头部警告区域 -->
    <el-alert
            show-icon
            title="注意：只允许为第三级分类设置相关参数！"
            type="warning"
            :closable="false"
            ></el-alert>

2.选择商品分类

2.1 界面样式

<el-row class="cat_opt">
          <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品的级联选择框 -->
        <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="casteProps"
            @change="handleChange"
            clearable
        ></el-cascader>
        </el-col>
      </el-row>

2.2 数据添加

// 商品分类列表
      cateList: [],
      // 指定级联选择器的配置对象
      casteProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        checkStrictly: true
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],

2.3 方法实现

// 级联选择框中选项变化会触发这个函数
    handleChange () {
      this.getParamsData()
    },

3.页签区添加参数、属性

3.1 界面样式

<el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
        <!-- 添加参数按钮 -->
            <el-button
                type="primary"
                size="mini"
                :disabled="isBtnDisabled"
                @click="addDialogVisible=true"
                >添加参数</el-button
                >
            <!-- 动态参数表格 -->
            <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
                <el-table-column type="expand">
            <template slot-scope="scope">
            <!-- 渲染tag标签 -->
            <el-tag
                v-for="(item, index) in scope.row.attr_vals"
                :key="index"
                closable
                @close="handleClose(index, scope.row)"
            >{{item}}</el-tag>

            <!-- 输入文本框 -->
            <el-input
            class="input-new-tag"
            v-if="scope.row.inputVisible"
            v-model="scope.row.w"
            ref="saveTagInput"
            size="small"
            @keyup.enter.native="handleInputConfirm(scope.row)"
            @blur="handleInputConfirm(scope.row)"
            ></el-input>

            <!-- 添加按钮 -->
            <el-button
            v-else
            class="button-new-tag"
            size="small"
            @click="showInput(scope.row)"
            >+ New Tag</el-button>
            </template>
</el-table-column>

            <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column
                label="参数名称"
                prop="attr_name"
                ></el-table-column>
                <el-table-column label="操作">
                    <template slot-scope = "scope ">
                        <el-button
                        type="primary"
                        icon="el-icon-edit"
                        size="mini"
                        @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button>

                        <el-button
                        type="danger"
                        icon="el-icon-delete"
                        size="mini"
                        @click="removeParams(scope.row.attr_id)"
                        >删除</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-tab-pane>

        <!-- 添加静态属性面板 -->
        <el-tab-pane label="静态属性" name="only">
        <!-- 添加属性按钮 -->
            <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
            >添加属性</el-button>
        <!-- 属性表格 -->
            <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
                <el-table-column type="expand">
            <!-- 索引列 -->

            <template slot-scope="scope">
                <!-- 循环渲染标签 -->
                <el-tag
                v-for="(item, index) in scope.row.attr_vals"
                :key="index"
                closable
                @close="handleClose(index, scope.row)"
                >{{item}}</el-tag>

                <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
                >
                </el-input>

                <!-- 添加按钮 -->
                <el-button
                v-else
                class="button-new-tag"
                size="small"
                @click="showInput(scope.row)"
                >
                    + New Tag
                </el-button>
                </template>
            </el-table-column>

                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                <el-table-column label="操作">
                    <template slot-scope="scope">
                        <el-button
                        type="primary"
                        icon="el-icon-edit"
                        size="mini"
                        @click="showEditDialog(scope.row.attr_id)"
                        >编辑</el-button>

                        <el-button
                        type="danger"
                        icon="el-icon-delete"
                        @click="removeParams(scope.row.attr_id)"
                        size="mini">删除</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-tab-pane>
    </el-tabs>

3.2 数据添加

// 被激活页签名称
      activeName: 'many',

      // 动态参数数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],

3.3 方法实现

// tab页签点击事件的处理函数
    handleTabClick () {
      this.getParamsData()
    },

    // 获取参数的列表数据
    async getParamsData () {
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
      }
      // 选中的是三级分类
      // 根据所选分类 id 和当前所处的版面，获取对应参数
      const { data: result } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: this.activeName }
          })
      if (result.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }

      result.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 添加一个布尔值，控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框输入的值
        item.inputValue = ''
      })

      if (this.activeName === 'many') {
        this.manyTableData = result.data
      } else {
        this.onlyTableData = result.data
      }
    },

// 点击按钮展示修改的对话框
    async showEditDialog (id) {
      const { data: result } = await this.$http.get(
            `categories/${this.cateId}/attributes/${id}`,
            { params: { attr_sel: this.activeName } })
      if (result.meta.status !== 200) {
        return this.$message.error('获取参数失败！')
      }
      this.editForm = result.data
      this.editDialogVisible = true
    },


 async removeParams (id) {
      const confirmResult = await this.$confirm(
        '此操作将永远删除该参数，是否继续？',
        '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)

      if (confirmResult !== confirm) {
        return this.$message.info('已取消删除')
      }

      // 删除
      const { data: result } = await this.$http.delete(
            `categories/${this.cateId}/attributes/${id}`
      )
      if (result.meta.status !== 200) {
        return this.$message.error('删除属性失败！')
      }
      this.$message.success('删除属性成功！')
      this.getParamsData()
    },

    // 文本框失去焦点，或按下enter键，会触发事件
    handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return，即有内容输入，要后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },

    // 点击按钮，展示文本输入框
    showInput (row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick方法作用：
      // 当页面上元素被重新渲染之后，才会执行回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },

4.添加参数对话框

4.1 界面样式

<el-dialog
    :title="`添加${titleText}`"
    :visible.sync="addDialogVisible"
    width="50%"
    @close="addDialogClosed">

    <!-- 内容主体区 -->
    <el-form
    :model="addForm"
    :rules="addFormRules"
    ref="addFormRef"
    label-width="100px"
    >
    <el-form-item :label="titleText" prop="attr_name">
        <el-input v-model="addForm.attr_name"></el-input>
    </el-form-item>
    </el-form>

    <!-- 底部区域 -->
    <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible=false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
    </span>
    </el-dialog>

4.2 数据添加

// 控制添加对话框的显示与隐藏
      addDialogVisible: false,

      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },

      // 添加表单的验证对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名', trigger: 'blur' }
        ]
      },

4.3 方法实现

computed: {
    // 如果按钮需要被禁用，返回真
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },

    cateId () {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },

    // 动态计算标题文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }

  },

// 点击按钮添加参数
    addParams () {
      this.$refs.addFormRef.validate(
        async valid => {
          if (!valid) return
          const { data: result } = await this.$http.post(
              `categories/${this.cateId}/attributes`, {
                attr_name: this.addForm.attr_name,
                attr_sel: this.activeName
              })
          if (result.meta.status !== 201) {
            return this.$message.error('添加参数失败')
          }
          this.$message.success('添加参数成功！')
          this.addDialogVisible = false
          this.getParamsData()
        }
      )
    },

5.修改参数对话框

5.1 界面样式

<el-dialog
        :title="`修改${titleText}`"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed">

    <!-- 内容主体区 -->
    <el-form
    :model="editForm"
    :rules="addFormRules"
    ref="editFormRef"
    label-width="100px">
    <el-form-item :label="`${titleText}`" prop="attr_name">
        <el-input v-model="editForm.attr_name"></el-input>
    </el-form-item>
    </el-form>

    <!-- 底部区域 -->
    <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible=false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
    </span>
    </el-dialog>

5.2 数据添加

// 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {}

5.3 方法实现

// 监听修改对话框的关闭事件
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },

    // 点击按钮修改参数
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: result } = await this.$http.put(
                `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                {
                  attr_name: this.editForm.attr_name,
                  attr_sel: this.activeName
                })
        if (result.meta.status !== 200) {
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },

// 将 对attr_vals操作后的数据保存到数据库
    async saveAttrVals (row) {
      // 需要发起请求保存操作
      const { data: result } = await this.$http.put(
          `categories/${this.cateId}/attributes/${row.attr_id}`, {
            attr_name: row.attr_name,
            attr_sel: row.attr_sel,
            attr_vals: row.attr_vals.join(' ')
          })
      if (result.meta.status !== 200) {
        return this.$message.error('修改参数项失败！')
      }
      this.$message.success('修改参数项成功！')
    }

6.功能展示