通过javascript和php动态排序表以及其他一些选择标准

我有两部分

第一部分是基于各种输入构建动态查询

第二部分是对结果表ASC/DESC 进行排序

PHP部分测试良好，运行良好

if( !empty( $_REQUEST['cond1'] ) ){
  $sql[] =  mysql_escape_string( $_GET['cond1'] );
}

等等…

直到最后条件

构建查询并获取记录

排序顺序的触发器如下

<table>
   <th><a href="orderby=name&obtype=A">Name</a></th>

</table>

当我点击href 时

作为GET PARAM通过的所有选择标准都将丢失

现在，查询仅使用字段的SORT ORDER来运行。

如何正确附加

orderby=name&obtype=A

要玩window.location，我正在使用以下功能

  // Function gets a param value from a URL when given a param name
  function getUrlParameter( url, name ) {
      name = name.replace(/['[]/,"'''[").replace(/[']]/,"''']");
      var regexS = "[''?&]"+name+"=([^&#]*)";
      var regex = new RegExp( regexS );
      var results = regex.exec( url );
      if( results == null )
          return "";
      else
          return results[1];
  }
  //Attaching Event handler for the heading and
  //finding what column heading is clicked
  $("#result-tbl th").click(function(ev){
    ev.preventDefault();
    // Build a URL from the orderbytriggered
    // Problem is when I click the first column it works
    // When i click the second, third, It keeps on adding all the order by
    // column which is not wanted.
    // Pls help me in finding the problem.
    var c = getUrlParameter( ev.target.href , 'orderby' ),
        d = getUrlParameter( ev.target.href , 'obtype' ),
        newurl = window.location.href + '&orderby=' + c + '&obtype=' + d;
    alert( newurl );
    window.location.href =  newurl;

  });

<?php 
if ($_SERVER['QUERY_STRING']) {
    myQueryString = $_SERVER['QUERY_STRING'] + "&orderby=name&obtype=A"
} else {
    myQueryString = "?orderby=name&obtype=A"
}    
?>
<table>
   <th><a href="<?=myQueryString?>">Name</a></th>
</table>