本期的微信小程序實戰篇來做一個電商網站經常用到的-商品屬性聯動選擇的效果，素材參考了一點點奶茶。

效果演示：

商品屬性聯動.gif

代碼示例

1、commodity.xml

<!-- <view class="title">屬性值聯動選擇</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-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">選好了 </button> </view>

上述代碼把頁面盒子分為兩部分commodity_attr_list和weui-btn-area。
commodity_attr_list：循環獲取商品的屬性名和相對應的屬性值，并布局頁面。
weui-btn-area：提交校驗并獲取選中商品屬性結果。

2、commodity.js

數據結構

//數據結構：以一組一組的數據來進行設定 commodityAttr: [{priceId: 1,price: 35.0,"stock": 8, "attrValueList": [ { "attrKey": "規格：", "attrValue": " 免費配料", "attrCode": "1001" }, { "attrKey": "甜度：", "attrValue": "七分甜", "attrCode": "2001" }, { "attrKey": "加料：", "attrValue": "珍珠", "attrCode": "3001" }, { "attrKey": "冰塊：", "attrValue": "少冰", "attrCode": "4001" } ] }, { priceId: 2, price: 35.1, "stock": 9, "attrValueList": [ { "attrKey": "規格：", "attrValue": " 燕麥", "attrCode": "1002" }, { "attrKey": "甜度：", "attrValue": "五分甜", "attrCode": "2002" }, { "attrKey": "加料：", "attrValue": "椰果", "attrCode": "3002" }, { "attrKey": "冰塊：", "attrValue": "去冰", "attrCode": "4002" } ] }, { priceId: 3, price: 35.2, "stock": 10, "attrValueList": [ { "attrKey": "規格：", "attrValue": " 布丁", "attrCode": "1003" }, { "attrKey": "甜度：", "attrValue": "無糖", "attrCode": "2003" }, { "attrKey": "加料：", "attrValue": "仙草", "attrCode": "3003" }, { "attrKey": "冰塊：", "attrValue": "常溫", "attrCode": "4003" } ] }, { priceId: 4, price: 35.2, "stock": 10, "attrValueList": [ { "attrKey": "規格：", "attrValue": "再加一份奶霜", "attrCode": "1004" }, { "attrKey": "甜度：", "attrValue": "無糖", "attrCode": "2003" }, { "attrKey": "加料：", "attrValue": "仙草", "attrCode": "3004" }, { "attrKey": "冰塊：", "attrValue": "熱飲", "attrCode": "4004" } ] }, { priceId: 5, price: 35.2, "stock": 10, "attrValueList": [ { "attrKey": "規格：", "attrValue": " 免費配料", "attrCode": "1004" }, { "attrKey": "甜度：", "attrValue": "五分甜", "attrCode": "2003" }, { "attrKey": "加料：", "attrValue": "椰果", "attrCode": "3004" }, { "attrKey": "冰塊：", "attrValue": "常溫", "attrCode": "4004" } ] } ], attrValueList: [] }

屬性選中和取消選擇效果處理

onShow: function () {this.setData({ includeGroup: this.data.commodityAttr }); this.distachAttrValue(this.data.commodityAttr); // 只有一個屬性組合的時候默認選中 // 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 }); } }, /* 獲取數據 */ distachAttrValue: function (commodityAttr) { /** 將后臺返回的數據組合成類似 { attrKey:'型號', attrValueList:['1','2','3'] } */ // 把數據對象的數據（視圖使用），寫到局部內 var attrValueList = this.data.attrValueList; // 遍歷獲取的數據 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，此時新增屬性并設置屬性值數組的第一個值；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) { /* 點選屬性值，聯動判斷其他屬性值是否可選 { attrKey:'型號', 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); } } }

結果提交

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: '請選擇完整！', 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('用戶點擊確定') } else if (res.cancel) { console.log('用戶點擊取消') } } }) console.log(valueStr); } }

3、commodity.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; display: flex; flex-direction: column; } /*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; } /*每個屬性值*/ .attr_value { float: left; padding: 0 30rpx; margin: 10rpx 10rpx; border: 1rpx solid #ececec; border-radius:5px; line-height:30px; } /*每個屬性選中的當前樣式*/ .attr_value_active { border-radius: 10rpx; color: #0089dc; padding: 0 30rpx; border: 1rpx solid #0089dc; /* background: #fff; */ } /*禁用屬性*/ .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，復制上述代碼就可以實現效果哦，趕緊試試吧！

作者：IT實戰聯盟Lin
鏈接：https://www.jianshu.com/p/f7f5f593b8e3
來源：簡書
簡書著作權歸作者所有，任何形式的轉載都請聯系作者獲得授權并注明出處。
更多專業前端知識，請上 【猿2048】www.mk2048.com

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