File: treemenu2.php3

<?
/*
 This is a modification on Sword Su's code. You can now collapse menus with out 
 having to click on another. I also refined the html a bit. I am currently 
 working on an easy way to implement nested menus.
*/
      echo '<font face="arial">';
      class submenu { 

        var $urls; 
        var $desps;
        var $cot;
        var $id; 
        //easily modify you menu symbols, can also use image tags
        var $openSymbol = '(+)';
	var $closedSymbol = '(--)';
	var $itemBranch = '&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp|---';

        function create($id) {
          $this->cot=0; 
              $this->id=$id;
        }

        function add($url, $desp) { 
          $this->urls[$this->cot]=$url;
          $this->desps[$this->cot]=$desp;     
          $this->cot++;
        }
        
        function open() { 
        $i=0;
        while($i<$this->cot) {
          if ($i==0) { 
	  	global $PHP_SELF;
                echo '<b><a href="'.$PHP_SELF.'?action=close&id=">'.$this->closedSymbol.$this->desps[0].'</a></b><br>';
              }
              else {
                echo $this->itemBranch.'<a href="'.$this->urls[$i].'">'.$this->desps[$i].'</a><br>';
          }
          $i++;
        }

        }
        
        function close() { 
	  global $PHP_SELF;
	  if (! $this->id){
	  
	  } else {
	  
	  echo '<b><a href="'.$PHP_SELF.'?action=open&id='.$this->id.'">'.$this->openSymbol.$this->desps[0].'</a></b><br>';	
          
	  }
	
	}
     
	  }
	  
      class menu { 

        var $submenus;
        var $cot; 
        var $id; 
        
        function create() { 
          $this->cot=0;
              $this->id=2;
        }
        
        function add($submenu) { 
          $this->submenus[$this->cot]=new submenu;
              $this->submenus[$this->cot]=$submenu;
              $this->cot++;
        }
        
        function show() { 
          $i=0;
              $tmp = new submenu;
              while ($i<$this->cot) {
                $tmp=$this->submenus[$i];
                if ($tmp->id==(string)$this->id) {
                  $tmp->open();
                }
                else {
                  $tmp->close();
                }
                $i++;
              }
        }
	
        function hide() { 
              $tmp = new submenu;
              $tmp->close();
        }	       
      } 

      $sm_1=new submenu;
      $sm_1->create('1');
      $sm_1->add('','Menu1');
      $sm_1->add('http://www.whu.edu.cn','Item1');
      $sm_1->add('http://www.whnet.edu.cn','Item2');
      $sm_1->add('http://www.pku.edu.cn','Item3');
      $sm_1->add('http://www.tsinghua.edu.cn','Item4'); 

      $sm_2=new submenu;
      $sm_2->create('2');
      $sm_2->add('','Menu2');
      $sm_2->add('http://www.whu.edu.cn','Item1');
      $sm_2->add('http://www.whnet.edu.cn','Item2');
      $sm_2->add('http://www.pku.edu.cn','Item3');
      $sm_2->add('http://www.tsinghua.edu.cn','Item4'); 

      $sm_3=new submenu;
      $sm_3->create('3');
      $sm_3->add('','Menu3');
      $sm_3->add('http://www.whu.edu.cn','Item1');
      $sm_3->add('http://www.whnet.edu.cn','Item2');
      $sm_3->add('http://www.pku.edu.cn','Item3');
      $sm_3->add('http://www.tsinghua.edu.cn','Item4'); 

      $sm_4=new submenu;
      $sm_4->create('4');
      $sm_4->add('','Menu4');
      $sm_4->add('http://www.whu.edu.cn','Item1');
      $sm_4->add('http://www.whnet.edu.cn','Item2');
      $sm_4->add('http://www.pku.edu.cn','Item3');
      $sm_4->add('http://www.tsinghua.edu.cn','Item4'); 

      $m_1=new menu;
      $m_1->create();
      $m_1->add($sm_1);
      $m_1->add($sm_2);
      $m_1->add($sm_3);
      $m_1->add($sm_4);
      
      if ($action=='') {
        $m_1->show();
      }

	  
      if ($action=='open') {
        $m_1->id=$id;
        $m_1->show();
      }
      
      if ($action=='close') {
        $m_1->id=$id;
        $m_1->hide();
	$m_1->show();
      }
      
	  echo '</font>';
      ?>