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微信小程序之商品属性分类 —— 微信小程序实战商城系列(4)

2017-12-13 光出溜

续上一篇的文章:微信小程序之购物数量加减 —— 微信小程序实战商城系列(3) 所提及的购物数量的加减,现在说说商品属性值联动选择。

 
 
 

续上一篇的文章:微信小程序之购物数量加减 —— 微信小程序实战商城系列(3)

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

现在就为大家介绍这个小组件,在小程序中,该如何去写

下图为本项目的图:

wxml:

[html] view plain copy
<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> 

 

wxss:

[css] view plain copy
.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;  
}  

 

js:

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。

[javascript] view plain copy
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:

 

 

demo地址:download.csdn.net/detai



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