微信小程序实战篇：商品属性联动选择（案例）

阳光穿透心脏的1/2处 2022-05-28 02:53 278阅读 0赞

IT实战联盟博客：[http://blog.100boot.cn ][http_blog.100boot.cn]  
![微信小程序.jpg][.jpg]

本期的微信小程序实战篇来做一个电商网站经常用到的-商品属性联动选择的效果，素材参考了一点点奶茶。  
\#\#\#\#效果演示：  
![商品属性联动.gif][.gif]

\#\#\#\#代码示例  
\#\#\#\#\#1、commodity.xml

<view class="commodity_attr_list"> 
        
        <view class="attr_box" wx:for="{
       {attrValueList}}" wx:for-item="attrValueObj" wx:for-index="attrIndex"> 
          
          <view class="attr_name">{
       {attrValueObj.attrKey}}</view> 
         
          
          <view class="attr_value_box"> 
              
              <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> 
    
    <view class="weui-btn-area"> 
        <button class="weui-btn" bindtap="submit">选好了       </button> 
    </view>

上述代码把页面盒子分为两部分**commodity\_attr\_list**和**weui-btn-area**。  
**commodity\_attr\_list**：循环获取商品的属性名和相对应的属性值，并布局页面。  
**weui-btn-area**：提交校验并获取选中商品属性结果。

\#\#\#\#\#2、commodity.js  
数据结构

//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: []
      }

属性选中和取消选择效果处理

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);
          }
        }
      }

结果提交

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);
        }
      }

\#\#\#\#\#3、commodity.wxss

.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; 
    }

好了，复制上述代码就可以实现效果哦，赶紧试试吧！  
\#\#\#\#更多精彩内容  
[微信小程序电商实战-入门篇][-]  
[微信小程序电商实战-首页（上）][- 1]  
[微信小程序电商实战-首页（下）][- 2]  
[微信小程序电商实战-商品详情（上）][- 3]  
[微信小程序电商实战-商品列表流式布局][- 4]  
[微信小程序实战篇：基于wxcharts.js绘制移动报表][wxcharts.js]

\#\#\#\#关注我们  
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IT实战联盟博客：[http://blog.100boot.cn ][http_blog.100boot.cn]

[http_blog.100boot.cn]: http://blog.100boot.cn%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B
[.jpg]: /images/20220528/e81776dbc5524888b387c5214400f7ee.png
[.gif]: /images/20220528/478d0ce304244d15bcd6e42526a6c6b2.png
[-]: http://www.jianshu.com/p/6e214401ffdd
[- 1]: http://www.jianshu.com/p/f490c62643d3
[- 2]: https://www.jianshu.com/p/7100a1268453
[- 3]: https://www.jianshu.com/p/6cee51acd018
[- 4]: https://www.jianshu.com/p/72d57252b4ef
[wxcharts.js]: https://www.jianshu.com/p/04ddbabda874