php＆mysql中的combobox treeview

Question

Does anyone know how to display MySQL db hierarchical data (Nested Set Model ( http://www.phpro.org/tutorials/Managing-Hierarchical-Data-with-PHP-and-MySQL.html )) in a combo box as shown here under the "Category:" comboxbox field: http://dir.globetourism.biz/submit.php

Thanks

Answer 1

您需要做的是在打印组合框的<option>标记时，您必须检查每个元素的depth （如何获得深度在问题所链接的文章中），并打印出许多“ |”字符串和另外两个下划线（__）使其看起来很像树。

Answer 2

<?PHP
function GetCats($id='0',$sublev='0',$vname='C_Parent')
{
 $DQ = new MySQLTable;
 $DQ -> TblName = 'cat_categories';
 $WHERE[$vname]['=']=$id;
 $res = $DQ -> Select('C_ID,C_Name',$WHERE,'C_ID');
 if (mysql_num_rows($res)>0)
 {
  while($row = mysql_fetch_assoc($res))
  {
    $ss='';
   if($sublev!=='0')
   {
    for($i=0;$i<=$sublev*10;$i++)
    {
     $ss.='&nbsp;';
    }
    $ss.='|';
    for($i=0;$i<=$sublev;$i++)
    {
     $ss.='-';
    }
     $ss.='&gt;&gt;';
   }
   $sel_s = '';
   if(IsSet($_POST['C_Parent']))
   {
    if($row['C_ID']==$_POST['C_Parent'])
    {
     $sel_s = ' selected';
    }
   } elseif (IsSet($_POST['I_Parent'])) {
    if($row['C_ID']==$_POST['I_Parent'])
    {
     $sel_s = ' selected';
    }
   } else {
    $sel_s = '';
   }
   Echo "<option value=\"".$row['C_ID']."\" ".$sel_s.">".$ss.$row['C_Name']."</option>\r\n";
   GetCats($row['C_ID'],$sublev+1);
  }
 }
}


     Echo "<select name=\"C_Parent\">\r\n";
     Echo "<option value=\"0\">...</option>\r\n";
     GetCats();
     Echo "</select>";
     ?>

Something like this.
But here was my own MySQL class. The query is: SELECT C_ID,C_Name WHERE C_Parent=$id ORDER BY C_ID where $id - php variable (current parent cat).
And there are $_POST variables if error submit to store selected.
This is not the most effective way to di it bcoz many queries. More effectively is to get all data to array to work with.