类似中关村在线，或者太平洋汽车 多属性搜索是怎么做的，怎样的思路
多属性搜索
http://detail.zol.com.cn/notebook_index/subcate16_0_list_4000_s1227_1_1_0_1.html 中关村在线http://price.pcauto.com.cn/price/q-p2-k75.html 太平洋汽车
点击某项属性，没有产品的某些属性就会相应的变灰不可用状态，
感问 要实现这样的功能是怎样的思路，如何做。。。
分数不多见谅了，呵呵....
回复讨论(解决方案)
这个之前有人问过
两种方案：
1是用javascript根据选择的变量组合成一个url，这种方案需要先选择，点击一个按钮后打开网页（操作有点像提交）
2是php根据每种参数写一个链接，这种方案每点击一个参数就刷新网页，刷新网页时就把参照已经选择的多个条件把所有链接重新计算输出
2的变形方案是ajax
view-source:http://detail.zol.com.cn/notebook_index/subcate16_0_list_4000_s1227_1_1_0_1.html
<dt>品牌</dt> <dd class="brand-sel-box clearfix"> <div id="singular" class="brand-list"> <span class="all sel">不限</span> <a href="/notebook_index/subcate16_160_list_4000_s1227_1_1_0_1.html">联想</a> <a href="/notebook_index/subcate16_227_list_4000_s1227_1_1_0_1.html">华硕</a> <a class="null" rel="nofollow" href="/notebook_index/subcate16_21_list_4000_s1227_1_1_0_1.html">戴尔</a> <a class="null" rel="nofollow" href="/notebook_index/subcate16_223_list_4000_s1227_1_1_0_1.html">惠普</a> <a href="/notebook_index/subcate16_1191_list_4000_s1227_1_1_0_1.html">神舟</a> <a class="null" rel="nofollow" href="/notebook_index/subcate16_218_list_4000_s1227_1_1_0_1.html">Acer宏?</a>.....<dt>价格</dt> <dd class="clearfix"> <a href="/notebook_index/subcate16_list_s1227_1.html" class="all">不限</a> <a class="null" rel="nofollow" href="/notebook_index/subcate16_0_list_0_s1227_1_1_0_1.html">1999元以下</a> <a href="/notebook_index/subcate16_0_list_2000_s1227_1_1_0_1.html">2000-2499元</a> <a href="/notebook_index/subcate16_0_list_2500_s1227_1_1_0_1.html">2500-2999元</a>
view-source:http://price.pcauto.com.cn/price/q-p2-k75.html
<div class="getTh">价格：</div><div class="umLimit"><a class='' href="/price/q-k75.html">不限</a></div><div class="Items"><a class='' href="/price/q-p1-k75.html">5万以下</a><a class=' s' href="/price/q-p2-k75.html">5-8万</a><a class='' href="/price/q-p3-k75.html">8-10万</a><a class='' href="/price/q-p4-k75.html">10-15万</a><a class='' href="/price/q-p5-k75.html">15-20万</a><a class='' href="/price/q-p6-k75.html">20-25万</a>......<div class="getTh">级别：</div><div class="umLimit"><a class='' href="/price/q-p2.html">不限</a></div><div class="Items"><a class=' ' href='/price/q-p2-k76.html'>微型车</a><a class=' ' href='/price/q-p2-k110.html'>小型车</a><a class=' ' href='/price/q-p2-k73.html'>紧凑型车</a><a class=' ' href='/price/q-p2-k72.html'>中型车</a><a class=' null' href='javascript:void(0)'>中大型车</a>
同样也是如此
常用的思路还是后台整合在url里面输出到前台吧。
ajiax 后台处理数据
最简单方式ajax 获取数据输出
其实问题的关键还是：“怎么通过某一事物的单一属性，判断其他属性是否存在”；
如果是 每点一次条件，都会到数据库里取一遍的话，这实现起来不难，比如点了一下
“5-8万” 这个条件，最笨的方法无非就是在后台
select * from auto_detail where market_price >= 50000 and market_price （假设auto_detail是一个存储了所有厂商的所有车型的详细资料表）
返回的结果可能有几百条，再对结果循环一遍，分别一一将返回集里的auto_grade,car_brand....(略)；都存入一个二维数组里。
那“所有汽车级别，汽车品牌。。”等等这些数据哪来呢？无非再select distinct auto_grade from xxx 而已。
做好点的话把所有这种供对比的，不必经常更新的数据放缓存里面，就不用每次都去数据库查一遍了。
然后就简单了，分别判断一下，auto_grade里那些属性是有的，那些属性是没有的，再返回一个数组给jQuery,控制页面把样式改了就可以了。
以上是最笨的做法，权当抛砖引玉
这个是专用企业级搜索引擎！
查solr, sphix 和lucene!
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