dedecms按栏目分类搜索功能的实现方法

<form action="{dede:field name='phpurl'/}/search.php" name="formsearch"> 
<div class="form"> 
<h4>搜索</h4> 
<input type="hidden" name="kwtype" value="0" /> 
<input type="hidden" name="searchtype" value="titlekeyword" /> 
<input name="keyword" type="text" class="search-keyword" id="search-keyword" /> 
<select name="typeid" class="search-option" id="typeid"> 
<option value='0' selected='1'>全部栏目</option> 
{dede:channelartlist typeid='top' } 
{dede:type} <option value='[field:id/]'>[field:typename/]</option>{/dede:type} 
{dede:channel type='son' noself='yes'} 
<option value='[field:id/]'>-[field:typename/]</option> 
{/dede:channel} 
{/dede:channelartlist} 
</select><button type="submit" class="search-submit">搜索</button> 
</div> 
</form>