旁门左道做joomla多级分类一
利用parent_id，暂时只考虑增加一级分类，而不是无限分类单元->一级分类->二级分类->文章
1.
admin.categories.php的function editCategory($edit )里仿照section代码添加：
$category= JRequest::getCmd( 'category', 'com_content' );
和
// build the html select list for Categoriesif ( $category == 'com_content' ) {if (!$row->catid && JRequest::getInt('parent_id')) { $row->catid = JRequest::getInt('parent_id');}$query = 'SELECT c.id AS value, c.title AS text'. ' FROM #__categories AS c'. ' WHERE c.section NOT LIKE "%com_%"'. ' AND c.published != -2'. ' ORDER BY c.ordering';$db->setQuery( $query );$category = $db->loadObjectList();$lists['category'] = JHTML::_('select.genericlist', $category, 'parent_id', 'class="inputbox" size="1"', 'value', 'text', $row->cateid );}至此可以显示选择parent_id表单并可以保存parent_id值，以上不用了换为以下代码：foreach ($sections as $section){$section_list[] = (int) $section->value;// get the type name - which is a special categoryif ($row->section) {if ($section->id == $row->section) {$contentSection = $section->text;}} else {if ($section->id == $row->section) {$contentSection = $section->text;}}} $sectioncategories = array ();$sectioncategories[-1] = array ();$sectioncategories[-1][] = JHTML::_('select.option', '-1', JText::_( 'Select Category' ), 'id', 'title');$section_list = implode('\', \'', $section_list); $query = 'SELECT id, title, section' .' FROM #__categories' .' WHERE section IN ( \''.$section_list.'\' )' . ' AND parent_id = 0 '.' ORDER BY ordering';$db->setQuery($query);$cat_list = $db->loadObjectList();// Uncategorized category mapped to uncategorized section$uncat = new stdClass();$uncat->id = 0;$uncat->title = JText::_('Uncategorized');$uncat->section = 0;$cat_list[] = $uncat; foreach ($sections as $section){$sectioncategories[$section->value] = array ();$rows2 = array ();foreach ($cat_list as $cat){if ($cat->section == $section->value) {$rows2[] = $cat;}}foreach ($rows2 as $row2) {$sectioncategories[$section->value][] = JHTML::_('select.option', $row2->id, $row2->title, 'id', 'title');}}$categories = array();foreach ($cat_list as $cat) {if($cat->section == $row->section)$categories[] = $cat;} $categories[] = JHTML::_('select.option', '0', JText::_( 'Select Category' ), 'id', 'title');$lists['parent_id'] = JHTML::_('select.genericlist',$categories, 'parent_id', 'class="inputbox" size="1"', 'id', 'title', $row->parent_id);
方法最下面修改代码为;
categories_html::edit( $row, $lists, $redirect,$sectioncategories );
将$sectioncategories的值也传入到categories_html::edit（）方法里。
添加js：用于动态更换分类列表，当改变单元时，分类随之改变。
<script type='text/javascript'>
function changeCatList( listname, source, key, orig_key, orig_val ) {
var list = eval( 'document.adminForm.' + listname );
// empty the list
for (i in list.options.length) {
list.options = null;
}
i = 1;
for (x in source) {
if (source == key) {
opt = new Option();
opt.value = source;
opt.text = source;
if ((orig_key == key && orig_val == opt.value) || i == 0) {
opt.selected = true;
}
list.options = opt;
list.options.value = 0;
list.options.text = source;
}
}
list.length = i;
}
</script>
2.
admin.categories.html.php的function edit( &$row, &$lists, $redirect )里添加：
<tr><td class="key"><label for="category"><?php echo '一级'.JText::_( 'Category' ); ?>:</label></td><td colspan="2"><?php echo $lists['parent_id']; ?></td></tr>
显示父分类选项表单
添加js代码，把$sectioncategories值传给js程序。用于动态改变分类列表选项
<script language="javascript" type="text/javascript">var sectioncategories = new Array;<?php$i = 0;foreach ($sectioncategories as $k=>$items) {foreach ($items as $v) {echo "sectioncategories[".$i++."] = new Array( '$k','".addslashes( $v->id )."','".addslashes( $v->title )."' );\n\t\t";}}?>
3.（这点不需要了）
在libraries/joomla/html/html/select.php里添加一个函数
function genericlist1( $arr, $name, $attribs = null, $key = 'value', $text = 'text', $selected = NULL, $idtag = false, $translate = false ){if ( is_array( $arr ) ) {reset( $arr );}if (is_array($attribs)) {$attribs = JArrayHelper::toString($attribs); }$id = $name;if ( $idtag ) {$id = $idtag;}$id= str_replace('[','',$id);$id= str_replace(']','',$id);$html= '<select name="'. $name .'" id="'. $id .'" '. $attribs .'>';$html .= '<option value=""></option>';$html.= JHTMLSelect::Options( $arr, $key, $text, $selected, $translate );$html.= '</select>';return $html;}
现在只是在后台创建或修改分类页面里看起来像三级分类，逻辑上是没有三级的，以后继续研究
http://www.agoit.com/upload/attachment/125715/65218ebb-67b1-3bce-b197-f58251bd85c6.jpg
数据库实例“2快速消费”的父分类是“1金融财经”
“9服装服饰”的父分类是“5娱乐休闲”
http://www.agoit.com/upload/attachment/125719/2b0dbf47-d4f8-3ad4-be86-c7dfed902be4.jpg
后台打开“快速消费”分类编辑页面效果
http://www.agoit.com/upload/attachment/125722/9e527bf1-7bd4-3d73-8d83-c637a4a56079.jpg
后台更换单元时，分类自动随之更换
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