因为最近在做一个项目，需要考虑到商品不同规格属性，百度了许多资源，找到这篇还不错的。
前端如何展示商品属性：SKU多维属性状态判断算法的应用
下面是源代码：
<!DOCTYPE html>
<html >
<head>
<meta charset="UTF-8">
<title>Sku 多维属性状态判断</title>
<style>
body {
font-size: 12px;
}
dt {
width: 100px;
text-align: right;
}
dl {
clear: both;
overflow:hidden;
}
dl.hl {
background:#ddd;
}
dt, dd {
float:left;
height: 40px;
line-height: 40px;
margin-left: 10px;
}
button {
font-size: 14px;
font-weight: bold;
padding: 4px 4px;
}
.disabled {
color:#999;
border: 1px dashed #666;
}
.active {
color: red;
}
</style>
</head>
<body>
<p>
<textarea id="data_area" cols="100" rows="10">
[
{ "颜色": "红", "尺码": "大", "型号": "A", "skuId": "3158055" },
{ "颜色": "白", "尺码": "大", "型号": "A", "skuId": "3158054" },
{ "颜色": "白", "尺码": "中", "型号": "B", "skuId": "3133859" },
{ "颜色": "蓝", "尺码": "小", "型号": "C", "skuId": "3516833" }
]
</textarea>
</p>
<p>
<input onclick="updateData()" type="button" value="更新数据">
</p>
<hr>
<div id="app"></div>
<hr>
<div id="msg"></div>
<script src="./js/jquery-1.11.3.js"></script>
<script>
var data = JSON.parse($('#data_area').val())
var res = {}
var spliter = '\u2299'
var r = {}
var keys = []
var selectedCache = []
/**
* 计算组合数据
*/
function combineAttr(data, keys) {
var allKeys = []
var result = {}
for (var i = 0; i < data.length; i++) {
var item = data[i]
var values = []
for (var j = 0; j < keys.length; j++) {
var key = keys[j]
if (!result[key]) result[key] = []
if (result[key].indexOf(item[key]) < 0) result[key].push(item[key])
values.push(item[key])
}
allKeys.push({
path: values.join(spliter),
sku: item['skuId']
})
}
return {
result: result,
items: allKeys
}
}
/**
* 渲染 DOM 结构
*/
function render(data) {
var output = ''
for (var i = 0; i < keys.length; i++) {
var key = keys[i];
var items = data[key]
output += '<dl data-type="'+ key +'" data-idx="'+ i +'">'
output += '<dt>'+ key +':</dt>'
output += '<dd>'
for (var j = 0; j < items.length; j++) {
var item = items[j]
var cName = j == 0 ? 'active' : ''
if (j == 0) { selectedCache.push(item) }
output += '<button data-title="'+ item +'" class="'+ cName +'" value="'+ item +'">'+ item +'</button> '
}
output += '</dd>'
output += '</dl>'
}
output += '</dl>'
$('#app').html(output)
}
function getAllKeys(arr) {
var result = []
for (var i = 0; i < arr.length; i++) { result.push(arr[i].path) }
return result
}
/**
* 取得集合的所有子集「幂集」
arr = [1,2,3]
i = 0, ps = [[]]:
j = 0; j < ps.length => j < 1:
i=0, j=0 ps.push(ps[0].concat(arr[0])) => ps.push([].concat(1)) => [1]
ps = [[], [1]]
i = 1, ps = [[], [1]] :
j = 0; j < ps.length => j < 2
i=1, j=0 ps.push(ps[0].concat(arr[1])) => ps.push([].concat(2)) => [2]
i=1, j=1 ps.push(ps[1].concat(arr[1])) => ps.push([1].concat(2)) => [1,2]
ps = [[], [1], [2], [1,2]]
i = 2, ps = [[], [1], [2], [1,2]]
j = 0; j < ps.length => j < 4
i=2, j=0 ps.push(ps[0].concat(arr[2])) => ps.push([3]) => [3]
i=2, j=1 ps.push(ps[1].concat(arr[2])) => ps.push([1, 3]) => [1, 3]
i=2, j=2 ps.push(ps[2].concat(arr[2])) => ps.push([2, 3]) => [2, 3]
i=2, j=3 ps.push(ps[3].concat(arr[2])) => ps.push([2, 3]) => [1, 2, 3]
ps = [[], [1], [2], [1,2], [3], [1, 3], [2, 3], [1, 2, 3]]
*/
function powerset(arr) {
var ps = [[]];
for (var i=0; i < arr.length; i++) {
for (var j = 0, len = ps.length; j < len; j++) {
ps.push(ps[j].concat(arr[i]));
}
}
return ps;
}
/**
* 生成所有子集是否可选、库存状态 map
*/
function buildResult(items) {
var allKeys = getAllKeys(items)
for (var i = 0; i < allKeys.length; i++) {
var curr = allKeys[i]
var sku = items[i].sku
var values = curr.split(spliter)
// var allSets = getAllSets(values)
var allSets = powerset(values)
// 每个组合的子集
for (var j = 0; j < allSets.length; j++) {
var set = allSets[j]
var key = set.join(spliter)
if (res[key]) {
res[key].skus.push(sku)
} else {
res[key] = {
skus: [sku]
}
}
}
}
}
function trimSpliter(str, spliter) {
// ⊙abc⊙ => abc
// ⊙a⊙⊙b⊙c⊙ => a⊙b⊙c
var reLeft = new RegExp('^' + spliter + '+', 'g');
var reRight = new RegExp(spliter + '+$', 'g');
var reSpliter = new RegExp(spliter + '+', 'g');
return str.replace(reLeft, '')
.replace(reRight, '')
.replace(reSpliter, spliter)
}
/**
* 获取当前选中的属性
*/
function getSelectedItem() {
var result = []
$('dl[data-type]').each(function () {
var $selected = $(this).find('.active')
if ($selected.length) {
result.push($selected.val())
} else {
result.push('')
}
})
return result
}
/**
* 更新所有属性状态
*/
function updateStatus(selected) {
for (var i = 0; i < keys.length; i++) {
var key = keys[i];
var data = r.result[key]
var hasActive = !!selected[i]
var copy = selected.slice()
for (var j = 0; j < data.length; j++) {
var item = data[j]
if (selected[i] == item) continue
copy[i] = item
var curr = trimSpliter(copy.join(spliter), spliter)
var $item = $('dl').filter('[data-type="'+ key +'"]').find('[value="'+ item +'"]')
var titleStr = '['+ copy.join('-') +']'
if (res[curr]) {
$item.removeClass('disabled')
setTitle($item.get(0))
} else {
$item.addClass('disabled').attr('title', titleStr + ' 无此属性搭配')
}
}
}
}
/**
* 正常属性点击
*/
function handleNormalClick($this) {
$this.siblings().removeClass('active')
$this.addClass('active')
}
/**
* 无效属性点击
*/
function handleDisableClick($this) {
var $currAttr = $this.parents('dl').eq(0)
var idx = $currAttr.data('idx')
var type = $currAttr.data('type')
var value = $this.val()
$this.removeClass('disabled')
selectedCache[idx] = value
console.log(selectedCache)
// 清空高亮行的已选属性状态（因为更新的时候默认会跳过已选状态）
$('dl').not($currAttr).find('button').removeClass('active')
updateStatus(getSelectedItem())
/**
* 恢复原来已选属性
* 遍历所有非当前属性行
* 1. 与 selectedCache 对比
* 2. 如果要恢复的属性存在（非 disable）且 和当前*未高亮行*已选择属性的*可组合*），高亮原来已选择的属性且更新
* 3. 否则什么也不做
*/
for (var i = 0; i < keys.length; i++) {
var item = keys[i]
var $curr = $('dl[data-type="'+ item +'"]')
if (item == type) continue
var $lastSelected = $curr.find('button[value="'+ selectedCache[i] +'"]')
// 缓存的已选属性没有 disabled (可以被选择)
if (!$lastSelected.hasClass('disabled')) {
$lastSelected.addClass('active')
updateStatus(getSelectedItem())
}
}
}
/**
* 高亮当前属性区
*/
function highLighAttr() {
for (var i = 0; i < keys.length; i++) {
var key = keys[i]
var $curr = $('dl[data-type="'+ key +'"]')
if ($curr.find('.active').length < 1) {
$curr.addClass('hl')
} else {
$curr.removeClass('hl')
}
}
}
function bindEvent() {
$('#app').undelegate().delegate('button', 'click', function (e) {
var $this = $(this)
var isActive = $this.hasClass('.active')
var isDisable = $this.hasClass('disabled')
if (!isActive) {
handleNormalClick($this)
if (isDisable) {
handleDisableClick($this)
} else {
selectedCache[$this.parents('dl').eq(0).data('idx')] = $this.val()
}
updateStatus(getSelectedItem())
highLighAttr()
showResult()
}
})
$('button').each(function () {
var value = $(this).val()
if (!res[value] && !$(this).hasClass('active')) {
$(this).addClass('disabled')
}
})
}
function showResult() {
var result = getSelectedItem()
var s = []
for (var i = 0; i < result.length; i++) {
var item = result[i];
if (!!item) {
s.push(item)
}
}
if (s.length == keys.length) {
var curr = res[s.join(spliter)]
if (curr) {
s = s.concat(curr.skus)
}
$('#msg').html('已选择：' + s.join('\u3000-\u3000'))
}
}
function updateData() {
data = JSON.parse($('#data_area').val())
init(data)
}
function setTitle(el) {
var title = $(el).data('title');
if (title) $(el).attr('title', title);
}
function setAllTitle() {
$('#app').find('button').each(setTitle)
}
function init(data) {
res = {}
r = {}
keys = []
selectedCache = []
for (var attr_key in data[0]) {
if (!data[0].hasOwnProperty(attr_key)) continue;
if (attr_key != 'skuId') keys.push(attr_key)
}
setAllTitle();
r = combineAttr(data, keys)
render(r.result)
buildResult(r.items)
updateStatus(getSelectedItem())
showResult()
bindEvent()
}
init(data)
</script>
</body>
</html>
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