微信小程序商城項(xiàng)目之商品屬性分類(4)

更新時(shí)間：2022年05月22日 07:49:05 作者：michael_ouyang

這篇文章主要為大家詳細(xì)介紹了微信小程序商城項(xiàng)目之商品屬性值聯(lián)動(dòng)選擇,具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

續(xù)上一篇的文章：微信小程序之購(gòu)物數(shù)量加減 —— 微信小程序?qū)崙?zhàn)商城系列（3）
所提及的購(gòu)物數(shù)量的加減，現(xiàn)在說(shuō)說(shuō)商品屬性值聯(lián)動(dòng)選擇。

為了讓同學(xué)們有個(gè)直觀的了解，到電商網(wǎng)截了一個(gè)圖片，就是紅圈所示的部分

現(xiàn)在就為大家介紹這個(gè)小組件，在小程序中，該如何去寫
下圖為本項(xiàng)目的圖：

wxml：

<view class="title">商品屬性值聯(lián)動(dòng)選擇</view> 
<!--options--> 
<view class="commodity_attr_list"> 
 <!--每組屬性--> 
 <view class="attr_box" wx:for="{{attrValueList}}" wx:for-item="attrValueObj" wx:for-index="attrIndex"> 
 <!--屬性名--> 
 <view class="attr_name">{{attrValueObj.attrKey}}</view> 
 <!--屬性值--> 
 <view class="attr_value_box"> 
 <!--每個(gè)屬性值--> 
 <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">確定</button> 
</view>

wxss：

.title { 
 padding: 10rpx 20rpx; 
 margin: 10rpx 0; 
 border-left: 4rpx solid #ccc; 
} 
 
/*全部屬性的主盒子*/ 
.commodity_attr_list { 
 background: #fff; 
 padding: 0 20rpx; 
 font-size: 26rpx; 
 overflow: hidden; 
 width: 100%; 
} 
/*每組屬性的主盒子*/ 
.attr_box { 
 width: 100%; 
 overflow: hidden; 
 border-bottom: 1rpx solid #ececec; 
} 
/*屬性名*/ 
.attr_name { 
 width: 20%; 
 float: left; 
 padding: 15rpx 0; 
} 
/*屬性值*/ 
.attr_value_box { 
 width: 80%; 
 float: left; 
 padding: 15rpx 0; 
 overflow: hidden; 
} 
/*每個(gè)屬性值*/ 
.attr_value { 
 float: left; 
 padding: 0 10rpx; 
 margin: 0 10rpx; 
 border: 1rpx solid #ececec; 
} 
/*每個(gè)屬性選中的當(dāng)前樣式*/ 
.attr_value_active { 
 background: #FFCC00; 
 border-radius: 10rpx; 
 color: #fff; 
 padding: 0 10rpx; 
} 
/*禁用屬性*/ 
.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：

數(shù)據(jù)部分，一般情況都是訪問(wèn)接口獲取數(shù)據(jù)的，這里并沒有使用網(wǎng)絡(luò)訪問(wèn)，為了簡(jiǎn)化demo，直接把一組數(shù)據(jù)放在data對(duì)象中。

Page({ 
 data: { 
 firstIndex: -1, 
 //準(zhǔn)備數(shù)據(jù) 
 //數(shù)據(jù)結(jié)構(gòu)：以一組一組來(lái)進(jìn)行設(shè)定 
 commodityAttr: [ 
 { 
 priceId: 1, 
 price: 35.0, 
 "stock": 8, 
 "attrValueList": [ 
 { 
 "attrKey": "型號(hào)", 
 "attrValue": "2" 
 }, 
 { 
 "attrKey": "顏色", 
 "attrValue": "白色" 
 }, 
 { 
 "attrKey": "大小", 
 "attrValue": "小" 
 }, 
 { 
 "attrKey": "尺寸", 
 "attrValue": "S" 
 } 
 ] 
 }, 
 { 
 priceId: 2, 
 price: 35.1, 
 "stock": 9, 
 "attrValueList": [ 
 { 
 "attrKey": "型號(hào)", 
 "attrValue": "1" 
 }, 
 { 
 "attrKey": "顏色", 
 "attrValue": "黑色" 
 }, 
 { 
 "attrKey": "大小", 
 "attrValue": "小" 
 }, 
 { 
 "attrKey": "尺寸", 
 "attrValue": "M" 
 } 
 ] 
 }, 
 { 
 priceId: 3, 
 price: 35.2, 
 "stock": 10, 
 "attrValueList": [ 
 { 
 "attrKey": "型號(hào)", 
 "attrValue": "1" 
 }, 
 { 
 "attrKey": "顏色", 
 "attrValue": "綠色" 
 }, 
 { 
 "attrKey": "大小", 
 "attrValue": "大" 
 }, 
 { 
 "attrKey": "尺寸", 
 "attrValue": "L" 
 } 
 ] 
 }, 
 { 
 priceId: 4, 
 price: 35.2, 
 "stock": 10, 
 "attrValueList": [ 
 { 
 "attrKey": "型號(hào)", 
 "attrValue": "1" 
 }, 
 { 
 "attrKey": "顏色", 
 "attrValue": "綠色" 
 }, 
 { 
 "attrKey": "大小", 
 "attrValue": "大" 
 }, 
 { 
 "attrKey": "尺寸", 
 "attrValue": "L" 
 } 
 ] 
 } 
 ], 
 attrValueList: [] 
 }, 
 onShow: function () { 
 this.setData({ 
 includeGroup: this.data.commodityAttr 
 }); 
 this.distachAttrValue(this.data.commodityAttr); 
 // 只有一個(gè)屬性組合的時(shí)候默認(rèn)選中 
 // 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 
 }); 
 } 
 }, 
 /* 獲取數(shù)據(jù) */ 
 distachAttrValue: function (commodityAttr) { 
 /** 
 將后臺(tái)返回的數(shù)據(jù)組合成類似 
 { 
 attrKey:'型號(hào)', 
 attrValueList:['1','2','3'] 
 } 
 */ 
 // 把數(shù)據(jù)對(duì)象的數(shù)據(jù)（視圖使用），寫到局部?jī)?nèi) 
 var attrValueList = this.data.attrValueList; 
 // 遍歷獲取的數(shù)據(jù) 
 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('屬性索引', attrIndex); 
 // 如果還沒有屬性索引為-1，此時(shí)新增屬性并設(shè)置屬性值數(shù)組的第一個(gè)值；索引大于等于0，表示已存在的屬性名的位置 
 if (attrIndex >= 0) { 
 // 如果屬性值數(shù)組中沒有該值，push新值；否則不處理 
 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) { 
 // 判斷數(shù)組中的attrKey是否有該屬性值 
 for (var i = 0; i < attrValueList.length; i++) { 
 if (attrName == attrValueList[i].attrKey) { 
 break; 
 } 
 } 
 return i < attrValueList.length ? i : -1; 
 }, 
 isValueExist: function (value, valueArr) { 
 // 判斷是否已有屬性值 
 for (var i = 0; i < valueArr.length; i++) { 
 if (valueArr[i] == value) { 
 break; 
 } 
 } 
 return i < valueArr.length; 
 }, 
 /* 選擇屬性值事件 */ 
 selectAttrValue: function (e) { 
 /* 
 點(diǎn)選屬性值，聯(lián)動(dòng)判斷其他屬性值是否可選 
 { 
 attrKey:'型號(hào)', 
 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;//屬性索引 
 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) { 
 // 取消選中 
 this.disSelectValue(attrValueList, index, key, value); 
 } else { 
 // 選中 
 this.selectValue(attrValueList, index, key, value); 
 } 
 
 } 
 }, 
 /* 選中 */ 
 selectValue: function (attrValueList, index, key, value, unselectStatus) { 
 // console.log('firstIndex', this.data.firstIndex); 
 var includeGroup = []; 
 if (index == this.data.firstIndex && !unselectStatus) { // 如果是第一個(gè)選中的屬性值，則該屬性所有值可選 
 var commodityAttr = this.data.commodityAttr; 
 // 其他選中的屬性值全都置空 
 // console.log('其他選中的屬性值全都置空', 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('選中', 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; 
 
 // 判斷屬性是否可選 
 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('結(jié)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) {// 第一次選中，同屬性的值都可選 
 this.setData({ 
 firstIndex: index 
 }); 
 } else { 
 this.setData({ 
 firstIndex: -1 
 }); 
 } 
 }, 
 /* 取消選中 */ 
 disSelectValue: function (attrValueList, index, key, value) { 
 var commodityAttr = this.data.commodityAttr; 
 attrValueList[index].selectedValue = ''; 
 
 // 判斷屬性是否可選 
 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); 
 } 
 } 
 }, 
 /* 點(diǎn)擊確定 */ 
 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: '請(qǐng)完善屬性', 
 icon: 'loading', 
 duration: 1000 
 }) 
 } else { 
 wx.showToast({ 
 title: '選擇的屬性：' + value.join('-'), 
 icon: 'sucess', 
 duration: 1000 
 }) 
 } 
 } 
})

運(yùn)行效果：