微信小程序之商品屬性分類 —— 微信小程序?qū)崙?zhàn)商城系列（4） ... ...
發(fā)布時間：2018-04-20 10:21 所屬欄目：小程序開發(fā)教程
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續(xù)上一篇的文章：微信小程序之購物數(shù)量加減 —— 微信小程序?qū)崙?zhàn)商城系列（3） 所提及的購物數(shù)量的加減，現(xiàn)在說說商品屬性值聯(lián)動選擇。 為了讓同學(xué)們有個直觀的了解，到電商網(wǎng)截了一個圖片，就是紅圈所示的部分
現(xiàn)在就為大家介紹這個小組件，在小程序中，該如何去寫 下圖為本項目的圖：
wxml：
[html] view plain copy
<view class="title">商品屬性值聯(lián)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-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：
[css] view plain copy
.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;
}
/*每個屬性值*/
.attr_value {
float: left;
padding: 0 10rpx;
margin: 0 10rpx;
border: 1rpx solid #ececec;
}
/*每個屬性選中的當前樣式*/
.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，一般情況都是訪問接口獲取數(shù)據(jù)的，這里并沒有使用網(wǎng)絡(luò)訪問，為了簡化demo，直接把一組數(shù)據(jù)放在data對象中。
[javascript] view plain copy
Page({
data: {
firstIndex: -1,
//準備數(shù)據(jù)
//數(shù)據(jù)結(jié)構(gòu)：以一組一組來進行設(shè)定
commodityAttr: [
{
priceId: 1,
price: 35.0,
"stock": 8,
"attrValueList": [
{
"attrKey": "型號",
"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",
"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",
"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",
"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(shù)據(jù) */
distachAttrValue: function (commodityAttr) {
/**
將后臺返回的數(shù)據(jù)組合成類似
{
attrKey:'型號',
attrValueList:['1','2','3']
}
*/
// 把數(shù)據(jù)對象的數(shù)據(jù)（視圖使用），寫到局部內(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，此時新增屬性并設(shè)置屬性值數(shù)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(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) {
/*
點選屬性值，聯(lián)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(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: '請完善屬性',
icon: 'loading',
duration: 1000
})
} else {
wx.showToast({
title: '選擇的屬性：' + value.join('-'),
icon: 'sucess',
duration: 1000
})
}
}
})
運行效果：
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