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最近问无限分类的类树问题比较多，所以一高兴自己写了一个，我刚写完的，大家用用看，看看怎么实现起来更快，更简单，把你的树也贴出来(要只查询一次数据库的)<br>
这是一棵分类列表的类树, 支持无限分类<br>
一个分类下面可以同时有"包含子类的分类"和"最终分类";<br>
唯一的优点是*****只需要进行一次的数据库*****查询.<br>
样子不是很好看，不过可以自定义修改,可以自己定义css加里面<br> 数据挖掘实验室
缓存方面还没有作，可以自己补上
下面例子的目录结构是这样的。
¦--Catagory.php <br>
¦--images----tree.jsp <br>
¦--images----treeopen.gif <br>
¦--images----treeclose.gif <br>
¦--images----line.gif <br> 数据挖掘实验室
/****************tree.jsp********************/
function expand(id){
node = document.all("node"+id);
if(node.style.display=="){
node.style.display = "none";
document.images("img"+id).src = imgopen;
}else{
node.style.display = ";
document.images("img"+id).src = imgclose; 数据挖掘论坛
}
}
/****************Catagory.php********************/
<?php
define("CATAGORY_TREE_EXPEND_NONE",0);
define("CATAGORY_TREE_EXPEND_ALL",1);
class Catagory{
//基础分类数据
var $treeData = array();
//分类的等级结构数组，以分类的id值作为数组的关键字
var $treePList = array();
//自分类对应上级类的关系
var $treeCList = array();
/*
* 这个是大分类的模板
*
* __id__ 分类的编号 数据挖掘实验室
* __name__ 分类的名称
* __image__ 分类前面显示的图像名称 $imgOpen or $imgClose
* __open__ 分类当前是否是展开的
* __inner__ 子分类显示的位置
* 样式可以根据自己的需要任意修改 ，但是不能删除现有的元素
*/
var $blockTpl = "
<table border="0" cellpadding="0" cellspacing="0">
<tr>
<td colspan="2"><a onclick="expand(__id__); return false;" href="#">
<img src="__image__" border="0" width="15" height="15" id="img__id__"></a>
<a onclick="expand(__id__); return false;" href="#">
__name__</a></td>
</tr>
<tr id="node__id__" style="display:__open__;">
<td width="20"></td><td>__inner__</td>
</tr>
</table>";
/*
* 这个是小分类的模板
*
* see $blockTpl
*/
var $elementTpl = "<img src="images/line.gif" width="15" height="15"><a href="?id=__id__"><font color="white">__name__</font></a><br/>"; 数据挖掘论坛
/*
* 这个是当前位置显示模板
*
* see $blockTpl
*/
var $currentTpl = "<a href="?id=__id__"><font color="white">__name__</font></a>";
var $js = "images/tree.js";
var $imgOpen = "images/treeopen.gif";
var $imgClose = "images/treeclose.gif";
var $imgLine = "images/line.gif";
var $cachFile = ";
var $expand = 0; 数据挖掘实验室
var $result = array();
var $treeStr = ";
var $currentStr = ";
/*
* 用来初始化，传入分类数据
*
*param $data array()
*/
function Catagory(&$data){
$this->_init($data);
}
function _init($tmpData){
$plevel = $clevel = $treeData = array();
foreach($tmpData as $value){ 数据挖掘实验室
$treeData[$value["id"]] = $value;
$plevel[$value["pid"]][$value["id"]] = "END";
$clevel[$value["id"]] = $value["pid"];
}
$this->treeData = &$treeData;
$this->treePList = &$plevel; 数据挖掘实验室
$this->treeCList = &$clevel;
}
/*
* 解析分类列表
*
*param $cataId int 要解析的主分类的编号
*/
function parseNode($cataId=0){
$this->result = $this->treePList[$cataId];
if($this->result==null) die("Catagory id error");
$this->treeStr = $this->_doNode($this->result); 数据挖掘研究院
$this->treeStr .= $this->_jsParse();
}
function &_doNode(&$result){
$nstr = $estr = ";
foreach($result as $key=>$value){
if(isset($this->treePList[$key])){
$result[$key] = $this->treePList[$key];
$inner = $this->_doNode($result[$key]);
$nstr .= $this->_parseNodeTpl($key, $inner);
}else{
$estr .= $this->_parseElementTpl($key);
} 数据挖掘实验室
}
return $nstr.$estr;
}
function &_parseNodeTpl($cataId, $inner){
$data = $this->treeData[$cataId];
$str = preg_replace(" ¦__id__ ¦", $data["id"], $this->blockTpl);
$str = preg_replace(" ¦__name__ ¦", $data["name"], $str);
$str = preg_replace(" ¦__image__ ¦", ($this->expand? $this->imgClose:$this->imgOpen), $str); 数据挖掘交友
$str = preg_replace(" ¦__open__ ¦", ($this->expand?":"none"), $str);
$str = preg_replace(" ¦__inner__ ¦", $inner, $str);
return $str;
}
function _parseElementTpl($cataId){
$data = $this->treeData[$cataId];
$str = preg_replace(" ¦__id__ ¦", $data["id"], $this->elementTpl);
$str = preg_replace(" ¦__name__ ¦", $data["name"], $str);
$str = preg_replace(" ¦__image__ ¦", $this->imgLine, $str);
return $str;
}
function _jsParse(){
$str = "<script language="javascript">
imgopen = "$this->imgOpen"; 数据挖掘研究院
imgclose = "$this->imgClose";
</script><script src="$this->js" language="javascript"></script>";
return $str;
}
/*
* 展开分类$cataId
*
*param $cataId int 要展开的分类的编号 数据挖掘交友
*/
function parseCurrent($cataId){
$str = ";
$str .= $this->_parseCurrentTpl($cataId);
while(isset($this->treeCList[$cataId]) && $this->treeCList[$cataId]!=0){
$cataId = $this->treeCList[$cataId];
$str = $this->_parseCurrentTpl($cataId)."->".$str;
} 数据挖掘实验室
$this->currentStr = &$str;
}
function _parseCurrentTpl($cataId){
$data = $this->treeData[$cataId];
$str = preg_replace(" ¦__id__ ¦", $data["id"], $this->currentTpl);
$str = preg_replace(" ¦__name__ ¦", $data["name"], $str);
return $str;
}
/*
* 解析当前分类的路径
*
*param $cataId int 要解析的主分类的编号
*/
function expand($cataId){
if($this->expand>0) return ;
$str = ";
if(isset($this->treePList[$cataId])) $str .= "expand($cataId);";
while(isset($this->treeCList[$cataId]) && $this->treeCList[$cataId]!=0){ 数据挖掘论坛
$str .= "expand(".$this->treeCList[$cataId].");";
$cataId = $this->treeCList[$cataId];
}
$this->treeStr .= "<script language="javascript">$str</script>";
}
/*
* 返回当前分类的路径
*/
function getCurrentStr(){
return $this->currentStr;
}
/*
* 返回分类的类树
*/
function getTreeStr(){
return $this->treeStr;
}
function setTpl($blockTpl, $elementTpl, $currentTpl, $js){
$this->blockTpl = $blockTpl;
$this->elementTpl = $elementTpl;
$this->currentTpl = $currentTpl; 数据挖掘交友
$this->js = $js;
}
function setImage($open, $close, $line){
$this->imgOpen = $open;
$this->imgClose = $close;
$this->imgLine = $line;
}
function setExpend($expand){
$this->expand = $expand; 数据挖掘实验室
}
}
//分类的基础数据的样子如下:
$data = array(array("id"=>1, "name"=>"name1", "pid"=>0, "order"=>1),
array("id"=>2, "name"=>"name2", "pid"=>1, "order"=>1),
array("id"=>3, "name"=>"name3", "pid"=>0, "order"=>1),
array("id"=>4, "name"=>"name4", "pid"=>3, "order"=>1),
array("id"=>5, "name"=>"name5", "pid"=>6, "order"=>1), 数据挖掘研究院
array("id"=>6, "name"=>"name6", "pid"=>2, "order"=>1),
array("id"=>7, "name"=>"name7", "pid"=>6, "order"=>1),
array("id"=>8, "name"=>"name8", "pid"=>3, "order"=>1),
array("id"=>9, "name"=>"name9", "pid"=>6, "order"=>1),
array("id"=>10, "name"=>"name10", "pid"=>0, "order"=>1),
array("id"=>11, "name"=>"name11", "pid"=>10, "order"=>1),
array("id"=>12, "name"=>"name12", "pid"=>10, "order"=>1),
array("id"=>13, "name"=>"name13", "pid"=>10, "order"=>1),
array("id"=>14, "name"=>"name14", "pid"=>12, "order"=>1),
array("id"=>15, "name"=>"name15", "pid"=>12, "order"=>4),
);
echo "<body bgcolor="blue">";
$tree = new Catagory($data);
echo "<hr>下面是当前分类的类树<hr>";
//$tree->setExpend(1);
$tree->parseNode(0);
//$tree->parseNode(1);
//$tree->expand(9);
echo $tree->getTreeStr();
echo "<hr>下面是当前分类(分类的编号是9)的路径<hr>";
$tree->parseCurrent(9);
echo $tree->getCurrentStr();
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