[PHP] php+ajax实现商品对比功能示例

/*浮动窗口*/ 
(function(){ 
 var n=10; 
 var obj=document.getElementById("goods-compare"); 
 if(!obj){ 
  return false; 
 } 
 var x=0; 
 window.onscroll=function(){ 
  obj.style.top=(document.body.scrollTop||document.documentElement.scrollTop)+n+'px'; 
 }; 
 window.onresize=function(){ 
  obj.style.top=(document.body.scrollTop||document.documentElement.scrollTop)+n+'px'; 
 }; 
})(); 
//添加显示对比框 
function addcompare(chk){ 
 $('#goods-compare').fadeIn().show(); 
 var count=$(".compare-box li").length; 
 if (count>2)//这里可以修改对比的数据哦 
 { 
  alert('产品比较最多选3种哦'); 
  return; 
 } 
 $.ajax({ 
  type: 'post', 
  url: 'ajax.php', 
  data: { 
   'action':'1', 
   'gid':chk.gid,//商品ID 
   'gname':chk.gname,//商品名称 
   'gtype':chk.gtype//商品类别，类别不同时不能比较 
  }, 
  cache: false, 
  async: false, 
  success: function(result) { 
   if(result!='') 
   { 
  alert(result); 
   }else{ 
  var url='http://www.lusen.com/product-'+chk.gid+'.html';//设置商品的链接地址 
  $(".compare-box").append("<li class='division clearfix' id='"+chk.gid+"'><div class='span-3'><a href='"+url+"' target='_blank' title='"+chk.gname+"'>'"+chk.gname+"'</a></div><span +chk.gid+"');">删除</span></li>") 
  $("#comids").val($(".compare-box li").map(function(){//将对比的所有商品ID，赋值给#comids 
   return $(this).attr('id'); 
  }).get().join(",")); 
   } 
  } 
 }); 
} 
//删除对比产品 
function removecompare(id) 
{ 
 $.ajax({ 
  type: 'post', 
  url: 'ajax.php', 
  data: { 
   'action':'2', 
   'gid':id 
  }, 
  cache: false, 
  success: function(result) { 
   $("#"+id).remove(); 
   $("#comids").val($(".compare-box li").map(function(){ 
  return $(this).attr('id'); 
   }).get().join(",")); 
  } 
 }); 
} 
//清空对比产品 
function clearcompare() 
{ 
 $.ajax({ 
  type: 'post', 
  url: 'ajax.php', 
  data: { 
   'action':'3' 
  }, 
  cache: false, 
  success: function(result) { 
   $(".compare-box").html(''); 
   $("#comids").val(''); 
  } 
 }); 
} 
//显示对比框 
function showcompare() 
{ 
 $.ajax({ 
  type: 'post', 
  url: 'ajax.php', 
  data: { 
   'action':'4' 
  }, 
  success: function(result) { 
   if(result){ 
  $(".compare-box").append(result); 
  $("#comids").val($(".compare-box li").map(function(){ 
   return $(this).attr('id'); 
  }).get().join(",")); 
  $('#goods-compare').fadeIn().show(); 
   } 
  } 
 }); 
} 
//点击关闭对比框 
$('.close-gc').click(function(){ 
 $('#goods-compare').fadeOut().hide(); 
});

<?php 
function mb_unserialize($serial_str) { 
 $serial_str =stripslashes($serial_str); 
 return unserialize($serial_str); 
} 
if($_POST['action']=='1') {//add 
 if(isset($_COOKIE['gtype'])) { 
  if($_COOKIE['gtype']!=$_POST['gtype']) { 
   echo '对不起，您选择的是不同类别的产品无法加入对比，请选择同类产品或清空当前对比栏再选择。'; 
   return; 
  } 
 }else { 
  setcookie('gtype',$_POST['gtype']); 
 } 
 if(isset($_COOKIE['gid'])) { 
  $arr_str = $_COOKIE['gid']; 
  $arr=mb_unserialize($arr_str); 
  if(count($arr)>2) {//商品比较数量 
   echo "商品比较最多选3种"; 
   return; 
  } 
  foreach($arr as $val) { 
   if($val[0]==$_POST['gid']) { 
  echo "该商品已经加入对比框"; 
  return; 
   } 
  } 
  $info=array($_POST['gid'],$_POST['gname'],$_POST['gtype']); 
  $arr[]=$info; 
  $arr_str=serialize($arr); 
  setcookie('gid',$arr_str); 
 }else { 
  $info=array($_POST['gid'],$_POST['gname'],$_POST['gtype']); 
  $arr[]=$info; 
  $arr_str=serialize($arr); 
  setcookie('gid',$arr_str); 
 } 
}else if($_POST['action']=='2') {//delone 
 $id=$_POST['gid']; 
 $arr_str = $_COOKIE['gid']; 
 $arr=mb_unserialize($arr_str); 
 foreach($arr as $key=>$val) { 
  if($val[0]==$id) { 
   unset ($arr[$key]); 
  } 
 } 
 $arr_str=serialize($arr); 
 setcookie('gid',$arr_str); 
}else if($_POST['action']=='3') {//delall 
 setcookie('gid',''); 
 setcookie('gtype',''); 
}else if($_POST['action']=='4') {//showlist 
 if(isset($_COOKIE['gid'])) { 
  $data=''; 
  $arr_str = $_COOKIE['gid']; 
  $arr=mb_unserialize($arr_str); 
  foreach ($arr as $val){ 
   $url="http://www.lusen.com/product-".$val[0].".html"; 
   $data.="<li id='{$val[0]}' class='division clearfix'><div class='span-3'><a href='{$url}' target='_blank' title='{$val[1]}'>{$val[1]}</a></div><span >删除</span></li>"; 
  } 
  echo $data; 
 } 
} 
?>