微信小程序商城项目中商品属性分类的实现

续上一篇的文章：微信小程序之购物数量加减

所提及的购物数量的加减，现在说说商品属性值联动选择。

为了让同学们有个直观的了解，到电商网截了一个图片，就是红圈所示的部分

<view class="title">商品属性值联动选择</view>  <!--options-->  <view class="commodity_attr_list">   <!--每组属性-->   <view class="attr_box" wx:for="{{attrValueList}}" wx:for-item="attrValueObj" wx:for-index="attrIndex">   <!--属性名-->   <view class="attr_name">{{attrValueObj.attrKey}}</view>   <!--属性值-->   <view class="attr_value_box">   <!--每个属性值-->   <view class="attr_value {{attrIndex==firstIndex || attrValueObj.attrValueStatus[valueIndex]?(value==attrValueObj.selectedValue?'attr_value_active':''):'attr_value_disabled'}}" bindtap="selectAttrValue" data-status="{{attrValueObj.attrValueStatus[valueIndex]}}"   data-value="{{value}}" data-key="{{attrValueObj.attrKey}}" data-index="{{attrIndex}}" data-selectedvalue="{{attrValueObj.selectedValue}}" wx:for="{{attrValueObj.attrValues}}" wx:for-item="value" wx:for-index="valueIndex">{{value}}</view>   </view>   </view>  </view>  <!--button-->  <view class="weui-btn-area">   <button class="weui-btn" type="primary" bindtap="submit">确定</button>  </view>

.title {   padding: 10rpx 20rpx;   margin: 10rpx 0;   border-left: 4rpx solid #ccc;  }    /*全部属性的主盒子*/  .commodity_attr_list {   background: #fff;   padding: 0 20rpx;   font-size: 26rpx;   overflow: hidden;   width: 100%;  }  /*每组属性的主盒子*/  .attr_box {   width: 100%;   overflow: hidden;   border-bottom: 1rpx solid #ececec;  }  /*属性名*/  .attr_name {   width: 20%;   float: left;   padding: 15rpx 0;  }  /*属性值*/  .attr_value_box {   width: 80%;   float: left;   padding: 15rpx 0;   overflow: hidden;  }  /*每个属性值*/  .attr_value {   float: left;   padding: 0 10rpx;   margin: 0 10rpx;   border: 1rpx solid #ececec;  }  /*每个属性选中的当前样式*/  .attr_value_active {   background: #FFCC00;   border-radius: 10rpx;   color: #fff;   padding: 0 10rpx;  }  /*禁用属性*/  .attr_value_disabled {   color: #ccc;  }    /*button*/  .btn-area {   margin: 1.17647059em 15px 0.3em;  }    .btn {   margin-top: 15px;   background-color:#FFCC00;   color: #fff;  }  .btn:first-child {   margin-top: 0;  }

数据部分，一般情况都是访问接口获取数据的，这里并没有使用网络访问，为了简化demo，直接把一组数据放在data对象中。

Page({   data: {   firstIndex: -1,   //准备数据   //数据结构：以一组一组来进行设定   commodityAttr: [   {   priceId: 1,   price: 35.0,   "stock": 8,   "attrValueList": [   {   "attrKey": "型号",   "attrValue": "2"   },   {   "attrKey": "颜色",   "attrValue": "白色"   },   {   "attrKey": "大小",   "attrValue": "小"   },   {   "attrKey": "尺寸",   "attrValue": "S"   }   ]   },   {   priceId: 2,   price: 35.1,   "stock": 9,   "attrValueList": [   {   "attrKey": "型号",   "attrValue": "1"   },   {   "attrKey": "颜色",   "attrValue": "黑色"   },   {   "attrKey": "大小",   "attrValue": "小"   },   {   "attrKey": "尺寸",   "attrValue": "M"   }   ]   },   {   priceId: 3,   price: 35.2,   "stock": 10,   "attrValueList": [   {   "attrKey": "型号",   "attrValue": "1"   },   {   "attrKey": "颜色",   "attrValue": "绿色"   },   {   "attrKey": "大小",   "attrValue": "大"   },   {   "attrKey": "尺寸",   "attrValue": "L"   }   ]   },   {   priceId: 4,   price: 35.2,   "stock": 10,   "attrValueList": [   {   "attrKey": "型号",   "attrValue": "1"   },   {   "attrKey": "颜色",   "attrValue": "绿色"   },   {   "attrKey": "大小",   "attrValue": "大"   },   {   "attrKey": "尺寸",   "attrValue": "L"   }   ]   }   ],   attrValueList: []   },   onShow: function () {   this.setData({   includeGroup: this.data.commodityAttr   });   this.distachAttrValue(this.data.commodityAttr);   // 只有一个属性组合的时候默认选中   // console.log(this.data.attrValueList);   if (this.data.commodityAttr.length == 1) {   for (var i = 0; i < this.data.commodityAttr[0].attrValueList.length; i++) {   this.data.attrValueList[i].selectedValue = this.data.commodityAttr[0].attrValueList[i].attrValue;   }   this.setData({   attrValueList: this.data.attrValueList   });   }   },   /* 获取数据 */   distachAttrValue: function (commodityAttr) {   /**   将后台返回的数据组合成类似   {   attrKey:'型号',   attrValueList:['1','2','3']   }   */   // 把数据对象的数据（视图使用），写到局部内   var attrValueList = this.data.attrValueList;   // 遍历获取的数据   for (var i = 0; i < commodityAttr.length; i++) {   for (var j = 0; j < commodityAttr[i].attrValueList.length; j++) {   var attrIndex = this.getAttrIndex(commodityAttr[i].attrValueList[j].attrKey, attrValueList);   // console.log('属性索引', attrIndex);   // 如果还没有属性索引为-1，此时新增属性并设置属性值数组的第一个值；索引大于等于0，表示已存在的属性名的位置   if (attrIndex >= 0) {   // 如果属性值数组中没有该值，push新值；否则不处理   if (!this.isValueExist(commodityAttr[i].attrValueList[j].attrValue, attrValueList[attrIndex].attrValues)) {   attrValueList[attrIndex].attrValues.push(commodityAttr[i].attrValueList[j].attrValue);   }   } else {   attrValueList.push({   attrKey: commodityAttr[i].attrValueList[j].attrKey,   attrValues: [commodityAttr[i].attrValueList[j].attrValue]   });   }   }   }   // console.log('result', attrValueList)   for (var i = 0; i < attrValueList.length; i++) {   for (var j = 0; j < attrValueList[i].attrValues.length; j++) {   if (attrValueList[i].attrValueStatus) {   attrValueList[i].attrValueStatus[j] = true;   } else {   attrValueList[i].attrValueStatus = [];   attrValueList[i].attrValueStatus[j] = true;   }   }   }   this.setData({   attrValueList: attrValueList   });   },   getAttrIndex: function (attrName, attrValueList) {   // 判断数组中的attrKey是否有该属性值   for (var i = 0; i < attrValueList.length; i++) {   if (attrName == attrValueList[i].attrKey) {   break;   }   }   return i < attrValueList.length ? i : -1;   },   isValueExist: function (value, valueArr) {   // 判断是否已有属性值   for (var i = 0; i < valueArr.length; i++) {   if (valueArr[i] == value) {   break;   }   }   return i < valueArr.length;   },   /* 选择属性值事件 */   selectAttrValue: function (e) {   /*   点选属性值，联动判断其他属性值是否可选   {   attrKey:'型号',   attrValueList:['1','2','3'],   selectedValue:'1',   attrValueStatus:[true,true,true]   }   console.log(e.currentTarget.dataset);   */   var attrValueList = this.data.attrValueList;   var index = e.currentTarget.dataset.index;//属性索引   var key = e.currentTarget.dataset.key;   var value = e.currentTarget.dataset.value;   if (e.currentTarget.dataset.status || index == this.data.firstIndex) {   if (e.currentTarget.dataset.selectedvalue == e.currentTarget.dataset.value) {   // 取消选中   this.disSelectValue(attrValueList, index, key, value);   } else {   // 选中   this.selectValue(attrValueList, index, key, value);   }     }   },   /* 选中 */   selectValue: function (attrValueList, index, key, value, unselectStatus) {   // console.log('firstIndex', this.data.firstIndex);   var includeGroup = [];   if (index == this.data.firstIndex && !unselectStatus) { // 如果是第一个选中的属性值，则该属性所有值可选   var commodityAttr = this.data.commodityAttr;   // 其他选中的属性值全都置空   // console.log('其他选中的属性值全都置空', index, this.data.firstIndex, !unselectStatus);   for (var i = 0; i < attrValueList.length; i++) {   for (var j = 0; j < attrValueList[i].attrValues.length; j++) {   attrValueList[i].selectedValue = '';   }   }   } else {   var commodityAttr = this.data.includeGroup;   }     // console.log('选中', commodityAttr, index, key, value);   for (var i = 0; i < commodityAttr.length; i++) {   for (var j = 0; j < commodityAttr[i].attrValueList.length; j++) {   if (commodityAttr[i].attrValueList[j].attrKey == key && commodityAttr[i].attrValueList[j].attrValue == value) {   includeGroup.push(commodityAttr[i]);   }   }   }   attrValueList[index].selectedValue = value;     // 判断属性是否可选   for (var i = 0; i < attrValueList.length; i++) {   for (var j = 0; j < attrValueList[i].attrValues.length; j++) {   attrValueList[i].attrValueStatus[j] = false;   }   }   for (var k = 0; k < attrValueList.length; k++) {   for (var i = 0; i < includeGroup.length; i++) {   for (var j = 0; j < includeGroup[i].attrValueList.length; j++) {   if (attrValueList[k].attrKey == includeGroup[i].attrValueList[j].attrKey) {   for (var m = 0; m < attrValueList[k].attrValues.length; m++) {   if (attrValueList[k].attrValues[m] == includeGroup[i].attrValueList[j].attrValue) {   attrValueList[k].attrValueStatus[m] = true;   }   }   }   }   }   }   // console.log('结果', attrValueList);   this.setData({   attrValueList: attrValueList,   includeGroup: includeGroup   });     var count = 0;   for (var i = 0; i < attrValueList.length; i++) {   for (var j = 0; j < attrValueList[i].attrValues.length; j++) {   if (attrValueList[i].selectedValue) {   count++;   break;   }   }   }   if (count < 2) {// 第一次选中，同属性的值都可选   this.setData({   firstIndex: index   });   } else {   this.setData({   firstIndex: -1   });   }   },   /* 取消选中 */   disSelectValue: function (attrValueList, index, key, value) {   var commodityAttr = this.data.commodityAttr;   attrValueList[index].selectedValue = '';     // 判断属性是否可选   for (var i = 0; i < attrValueList.length; i++) {   for (var j = 0; j < attrValueList[i].attrValues.length; j++) {   attrValueList[i].attrValueStatus[j] = true;   }   }   this.setData({   includeGroup: commodityAttr,   attrValueList: attrValueList   });     for (var i = 0; i < attrValueList.length; i++) {   if (attrValueList[i].selectedValue) {   this.selectValue(attrValueList, i, attrValueList[i].attrKey, attrValueList[i].selectedValue, true);   }   }   },   /* 点击确定 */   submit: function () {   var value = [];   for (var i = 0; i < this.data.attrValueList.length; i++) {   if (!this.data.attrValueList[i].selectedValue) {   break;   }   value.push(this.data.attrValueList[i].selectedValue);   }   if (i < this.data.attrValueList.length) {   wx.showToast({   title: '请完善属性',   icon: 'loading',   duration: 1000   })   } else {   wx.showToast({   title: '选择的属性：' + value.join('-'),   icon: 'sucess',   duration: 1000   })   }   }  })

运行效果：

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