2021年6月3日

时间:1.8个小时左右

代码:320行左右

博客:1

学习内容：制作商品列表页面、制作商品添加页面

<template>
    <div>
        <h3>添加商品</h3>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 消息提示 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false">
            </el-alert>

            <!-- 步骤条组件 -->
            <!-- align-center(居中效果) -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- tab栏区域:el-tab-pane必须是el-tabs的子节点
            :tab-position="'left'"(设置tab栏为左右结构tab栏) -->
            <!-- 表单：label-position="top"(设置label在文本框上方) -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs v-model="activeIndex" :tab-position="'left'">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <!-- 选择商品分类的级联选择框 -->
                            <el-cascader expandTrigger='hover' v-model="addForm.goods_cat" :options="cateList" :props="cateProps" @change="handleChange" clearable></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">

                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">

                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">

                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">

                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
    </div>
</template>

<script>
export default {
  data() {
    return {
      //保存步骤条激活项索引
      activeIndex: '0',
      //添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat:[]
      },
      //验证规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      //用来保存分类数据
      cateList: [],
      //配置级联菜单中数据如何展示
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories')

      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败')
      }
      this.cateList = res.data
    },
    handleChange(){
      //如果用户选择的不是三级分类,该次选择无效，因为必须选择三级分类
      if(this.addForm.goods_cat.length !== 3){
        this.addForm.goods_cat = []
        return
      }
    }
  }
}
</script>

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

<el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
//在参数信息，商品属性面板中添加循环生成结构的代码
<el-tab-pane label="商品参数" name="1">
  <!-- 渲染表单item项 -->
  <el-form-item :label="item.attr_name" :key="item.attr_id" v-for="item in manyTableData">
      <!-- 使用数组渲染复选框组 -->
      <el-checkbox-group v-model="item.attr_vals">
          <el-checkbox border :label="val" v-for="(val,i) in item.attr_vals" :key="i"></el-checkbox>
      </el-checkbox-group>
  </el-form-item>
</el-tab-pane>
<el-tab-pane label="商品属性" name="2">
  <!-- 循环生成静态属性 -->
  <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
      <el-input v-model="item.attr_vals"></el-input>
  </el-form-item>
</el-tab-pane>

//在data数据中添加保存动态参数和静态属性的数组
export default {
  data() {
    return {
      ......
      //动态参数列表
      manyTableData: [],
      //静态属性列表
      onlyTableData:[]
      }
  },methods: {
    .......
    async tabClicked() {
      //当用户点击切换tab栏时触发
      if (this.activeIndex === '1') {
        //发送请求获取动态参数
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: 'many' } }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败')
        }
        //将attr_vals字符串转换为数组
        res.data.forEach(item => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        //发送请求获取静态属性
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: 'only' } }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性列表失败')
        }

        this.onlyTableData = res.data
      }
    }
  },
  //添加 计算属性获取三级分类
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}