微信小程序实现商品属性联动选择

<!-- <view class="title">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-code="{{attrCode}}" 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" bindtap="submit">选好了    </button> 
</view> 

//数据结构：以一组一组的数据来进行设定 
  commodityAttr: [
   {
    priceId: 1,
    price: 35.0,
    "stock": 8,
    "attrValueList": [
     {
      "attrKey": "规格：",
      "attrValue": "+免费配料",
      "attrCode": "1001"
     },
     {
      "attrKey": "甜度：",
      "attrValue": "七分甜",
      "attrCode": "2001"
     },
     {
      "attrKey": "加料：",
      "attrValue": "珍珠",
      "attrCode": "3001"
     },
     {
      "attrKey": "冰块：",
      "attrValue": "少冰",
      "attrCode": "4001"
     }
    ]
   },
   {
    priceId: 2,
    price: 35.1,
    "stock": 9,
    "attrValueList": [
     {
      "attrKey": "规格：",
      "attrValue": "+燕麦",
      "attrCode": "1002"
     },
     {
      "attrKey": "甜度：",
      "attrValue": "五分甜",
      "attrCode": "2002"
     },
     {
      "attrKey": "加料：",
      "attrValue": "椰果",
      "attrCode": "3002"
     },
     {
      "attrKey": "冰块：",
      "attrValue": "去冰",
      "attrCode": "4002"
     }
    ]
   },
   {
    priceId: 3,
    price: 35.2,
    "stock": 10,
    "attrValueList": [
     {
      "attrKey": "规格：",
      "attrValue": "+布丁",
      "attrCode": "1003"
     },
     {
      "attrKey": "甜度：",
      "attrValue": "无糖",
      "attrCode": "2003"
     },
     {
      "attrKey": "加料：",
      "attrValue": "仙草",
      "attrCode": "3003"
     },
     {
      "attrKey": "冰块：",
      "attrValue": "常温",
      "attrCode": "4003"
     }
    ]
   },
   {
    priceId: 4,
    price: 35.2,
    "stock": 10,
    "attrValueList": [
     {
      "attrKey": "规格：",
      "attrValue": "再加一份奶霜",
      "attrCode": "1004"
     },
     {
      "attrKey": "甜度：",
      "attrValue": "无糖",
      "attrCode": "2003"
     },
     {
      "attrKey": "加料：",
      "attrValue": "仙草",
      "attrCode": "3004"
     },
     {
      "attrKey": "冰块：",
      "attrValue": "热饮",
      "attrCode": "4004"
     }
    ]
   },
   {
    priceId: 5,
    price: 35.2,
    "stock": 10,
    "attrValueList": [
     {
      "attrKey": "规格：",
      "attrValue": "+免费配料",
      "attrCode": "1004"
     },
     {
      "attrKey": "甜度：",
      "attrValue": "五分甜",
      "attrCode": "2003"
     },
     {
      "attrKey": "加料：",
      "attrValue": "椰果",
      "attrCode": "3004"
     },
     {
      "attrKey": "冰块：",
      "attrValue": "常温",
      "attrCode": "4004"
     }
    ]
   }
  ],
  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);
   }
  }
 }

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: '请选择完整！',
    icon: 'loading',
    duration: 1000
   })
  } else {
   var valueStr = "";
   for(var i = 0;i < value.length;i++){
    console.log(value[i]);
    valueStr += value[i]+",";
   }
   wx.showModal({
    title: '提示',
    content: valueStr,
    success: function (res) {
     if (res.confirm) {
      console.log('用户点击确定')
     } else if (res.cancel) {
      console.log('用户点击取消')
     }
    }
   }) 
   console.log(valueStr);
  }
 }

.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; 
 display: flex;
 flex-direction: column;
} 
/*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 30rpx; 
 margin: 10rpx 10rpx; 
 border: 1rpx solid #ececec; 
 border-radius:5px;
 line-height:30px;
} 
/*每个属性选中的当前样式*/
.attr_value_active { 
 border-radius: 10rpx; 
 color: #0089dc; 
 padding: 0 30rpx; 
 border: 1rpx solid #0089dc; 
 /* background: #fff;  */
} 
/*禁用属性*/
.attr_value_disabled { 
 color: #ccc; 
} 
 
/*button*/
.weui-btn-area { 
 margin: 1.17647059em 15px 0.3em; 
} 
.weui-btn{
 width: 80%;
 height: 100rpx;
 border-radius: 3rpx; 
 background-color:#0089dc; 
 color: #fff; 
}