我想使用css和codeigniter制作动态树菜单。
这是cmb_menu表:
(`id_menu`, `id_parent`, `menu`)
(1, '0', 'see and do')
(2, '0', 'travel info')
(3, '0', 'inside dublin')
(4, '1', 'event')
(5, '1', 'tour')
(6, '2', 'tips')
我使用此功能获得正常结果。它有效。
function menu($parent=0,$hasil){
$w = $this->db->query("SELECT * from cmb_menu where id_parent='".$parent."'");
if(($w->num_rows())>0)
{
$hasil .= "<ul>";
}
foreach($w->result() as $h)
{
$hasil .= "<li>".$h->menu;
$hasil = $this->menu($h->id_menu,$hasil);
$hasil .= "</li>";
}
if(($w->num_rows)>0)
{
$hasil .= "</ul>";
}
return $hasil;
}
但是我在使用它时遇到问题,我不知道如何自定义该功能,所以我可以得到结果。像这样:
<ul class="menu span9 inline">
<li class="dropdown-submenu">
<a href="travel.html">see and do</a>
<ul class="dropdown-menu">
<li><a href="">Highlights</a></li>
<li class="dropdown-submenu">
<a href="">Activities</a>
<ul class="dropdown-menu">
<li><a href="">Traditional</a></li>
<li><a href="">Shopping</a></li>
<li><a href="">Cafes</a></li>
<li><a href="">Restaurants</a></li>
</ul>
</li>
<li><a href="">Events</a></li>
<li><a href="">Tour & Attractions</a></li>
</ul>
</li>
<li class="dropdown-submenu">
<a href="travel.html">where to stay</a>
<ul class="dropdown-menu">
<li><a href="">Hotel</a></li>
<li><a href="">Homestay</a></li>
<li><a href="">Guesthouse</a></li>
</ul>
</li>
<li><a href="fashion.html">inside minangkabau</a></li>
<li><a href="travel.html">travel info</a></li>
<li class="dropdown-submenu">
<a href="fashion.html">articles</a>
<ul class="dropdown-menu">
<li><a href="">Tips</a></li>
<li><a href="">Offers</a></li>
<li><a href="">Minangkabau</a></li>
<li><a href="">Culture</a></li>
<li><a href="">Food & Drink</a></li>
</ul>
</li>
<li><a href="travel.html">map</a></li>
</ul>
答案 0 :(得分:0)
MySQL无法执行递归查询。你有两个选择:
然后你只需要调用它来传递父id并迭代生成的行(每行是一个节点,第二列是子节点的id列表)。您可以更改函数的代码以添加更多信息。
DELIMITER $$
DROP FUNCTION IF EXISTS `GetFamilyTree` $$
FUNCTION `GetFamilyTree`(`GivenID` INT) RETURNS varchar(1024) CHARSET latin1
DETERMINISTIC
BEGIN
DECLARE rv,q,queue,queue_children VARCHAR(1024);
DECLARE queue_length,front_id,pos INT;
SET rv = '';
SET queue = GivenID;
SET queue_length = 1;
WHILE queue_length > 0 DO
SET front_id = FORMAT(queue,0);
IF queue_length = 1 THEN
SET queue = '';
ELSE
SET pos = LOCATE(',',queue) + 1;
SET q = SUBSTR(queue,pos);
SET queue = q;
END IF;
SET queue_length = queue_length - 1;
SELECT IFNULL(qc,'') INTO queue_children
FROM (SELECT GROUP_CONCAT(id) qc
FROM cmb_menu WHERE id_parent = front_id) A;
IF LENGTH(queue_children) = 0 THEN
IF LENGTH(queue) = 0 THEN
SET queue_length = 0;
END IF;
ELSE
IF LENGTH(rv) = 0 THEN
SET rv = queue_children;
ELSE
SET rv = CONCAT(rv,',',queue_children);
END IF;
IF LENGTH(queue) = 0 THEN
SET queue = queue_children;
ELSE
SET queue = CONCAT(queue,',',queue_children);
END IF;
SET queue_length = LENGTH(queue) - LENGTH(REPLACE(queue,',','')) + 1;
END IF;
END WHILE;
RETURN rv;
END$$