tv20.js

马士兵老师的代码

//定义一个数组,nodeitems,所有nodeitem的容器
nodeitems = new Array() ;
//根节点
tv_topnodeitem = null ;

//====================================================================================================================
//函数,添加一个节点,
//参数1:父节点ID,
//参数2:节点ID
//参数3:节点内容
//参数4:节点选用图片
function addNode(parentkey , key , lable , img){
    return new nodeitem( parentkey , key , lable , img ) ;
}
//====================================================================================================================
// 显示树,调用根结点的show方法
function showTV()  {
     tv_topnodeitem.show() ;
}
//====================================================================================================================
//得到父节点
function findNode( key )   {
	pppp = null;
	//遍历所有的nodeitem,如果某一个节点不为空并且key等于传进来的key值,返回改节点
    for( i = 0 ; i < nodeitems.length ; i ++ ) {
	   if( nodeitems[ i ] != null ) {
	      if( nodeitems[ i ].key == key ) {
	         pppp = nodeitems[ i ] ;
		  }
	   }
	}
    return pppp ;
}
//=========================================================================================================
//定义类:nodeitem
//lable:内容
//key:ID
//parent:父ID
//img:图片
//subitems:子节点,是数组
//questionId:
//description:
//status------------------------1:two-direction       0:nobox       0: disactivite
//                              2:three-0direction    1:close-box   1: activite
//                                                    2:open-box    
//一个function就是一个类。当你编写如下function时，其实就是定义了一个类，该function就是它的构造函数。                
function nodeitem( parentkey , key , lable , img )  {
    this.lable = lable ;
	this.key = key ;
    this.parent = findNode( parentkey ) ;
	if( this.parent != null )  {
	    aa = this.parent.status ;
	    if( aa.substring( 1 , 2 ) == "0" )
	        this.parent.status = aa.substring( 0 , 1 ) + "1" + aa.substring( 2 , 3 ) ;
	    if( this.parent.maxsubitem != null ) 
	        this.parent.maxsubitem.status = "2" + this.parent.maxsubitem.status.substring( 1 , 3 ) ;
        this.parent.subitems[ this.parent.subitems.length ] = this ;
        this.parent.maxsubitem = this ; 
    }
    else  {
	    if( tv_topnodeitem != null )   {
		     alert( "不能有两个顶项!" ) ;
			 return ;
        }
        tv_topnodeitem = this ;
    }
		 
	this.img = img ;
	this.tag = null ;
    this.status = "100" ;
	this.subitems = new Array() ;
	this.maxsubitem = null ;
	//设置id号
    this.id = nodeitemRegister( this ) ;

	//**********************
	this.questionId = 0;
	this.description = "";
	//this.url = null;
	//**********************
	
	//added by msb for the sort and move up/down
	/*if ( this == tv_topnodeitem )
	{
		this.nodeIndex = 0;
	} else {
		this.nodeIndex = this.parent.subitems.length;
	}*/
	//end added

}

//added by msb for the move up/down
nodeitem.prototype.moveUp = nodeitem_moveUp;
nodeitem.prototype.moveDown = nodeitem_moveDown;
//end added
//如何在Javascript实现OO编程？恐怕最好的方式就是充分利用prototype属性
//当你用prototype编写一个类后，当你new一个新的object，浏览器会自动把prototype中的内容替你附加在object上。
//这样，通过利用prototype，你也就实现了类似OO的Javascript
//定义show方法
nodeitem.prototype.show = nodeitem_show ;
nodeitem.prototype.refresh = nodeitem_refresh ;
//boxclick()方法,对应nodeitem_boxclick()函数
nodeitem.prototype.boxclick = nodeitem_boxclick ;
nodeitem.prototype.close = nodeitem_close ;
nodeitem.prototype.open = nodeitem_open ;
nodeitem.prototype.remove = nodeitem_remove ;
nodeitem.prototype.setTag = nodeitem_setTag ;
nodeitem.prototype.getTag = nodeitem_getTag ;
//=========================================
//各种图片
//=========================================
//空白
treeview_box_0_none = "images/4_clos.gif"  ;
//只有竖线
treeview_box_0_line = "images/4_none.gif" ;
//三个方向有竖线
treeview_box_2_open = "images/2_open.gif" ;
treeview_box_2_none = "images/2_none.gif" ;
treeview_box_2_close = "images/2_clos.gif" ;
//两个方向有竖线
treeview_box_1_open = "images/3_open.gif" ;
treeview_box_1_none = "images/3_none.gif" ;
treeview_box_1_close = "images/3_clos.gif" ;

function nodeitem_show()  {
	//<span id = \"preface0\"><table border='0' cellspacing='0' cellpadding='0'><tr><td>
	//每个Node一个span.
	str = "<span id = \"preface" + this.id + "\"><table border='1' cellspacing='0' cellpadding='0'><tr><td>" ;
    str_f = "" ;
	//
	//如果有父节点,缩进
    for( j = this.parent ; j != null ; j = j.parent )  {
		//alert(j.status);
	    //显示空白
		if( j.status.substring( 0 , 1 ) == 1 )
		    str_f = "<img src = '" + treeview_box_0_none + "' align='absmiddle'>" + str_f ;
        //只显示竖线
		else
		    str_f = "<img src = '" + treeview_box_0_line + "' align='absmiddle'>" + str_f ;
    }
    str = str + str_f ;
	//判断状态码头两位,决定显示加号还是减号
    str += "<img id = 'box" + this.id + "' nodeid = '" + this.id + "' src = '" ;
    switch( this.status.substring( 0 , 2 ) )   {
        case "10" : str += treeview_box_1_none ; break ;
        case "11" : str += treeview_box_1_close ; break ;
        case "12" : str += treeview_box_1_open ; break ;
        case "20" : str += treeview_box_2_none ; break ;
        case "21" : str += treeview_box_2_close ; break ;
        case "22" : str += treeview_box_2_open ; break ;
    }
	//当单击事件发生,调用box_on_click,把自己传进去
    str += "' align='absmiddle' onclick='box_on_click(this)'>" ;
    //如果没有前导图片,就不显示
	if( this.img == "" )
	    str += this.img ;
    //否则,显示前导图片
	else
	    str += "<img src = '" + this.img + "' align='absmiddle' width='16' height='16'>" ;
    
	str += "</td><td><table border='0' cellspacing='1' cellpadding='1' style='font-size:9pt; color:#333333' id='lablePanel" + this.id + "'><tr><td ondblclick = 'lable_on_dblclick(" + this.id + ")' onclick='lable_on_click(" + this.id + ")' style='cursor:hand' id='f_lablePanel" + this.id + "' nowrap>" + this.lable + "</td></tr></table></td></tr></table>" ;  
	
	//显示下一个SPAN,id=tv_panel_0
	str += "</span><span id = 'tv_panel_" + this.id + "' style='display:" ;
	
	//如果是打开状态,style="DISPLAY: "
	if( this.status.substring( 1 , 2 ) == '2' )
	   str += "" ;
	//否则style="DISPLAY: none"
	else
	   str += "none" ;
	 
    str += "'></span>" ;
	
	//如果上面没有父亲了,找到BODY标签,再BODY标签刚刚开始的位置,加入这个str
	if( this.parent == null )  
  	   for(var i in document.all){
          if (document.all[i].tagName == "BODY")
          {
		      document.all[i].insertAdjacentHTML( "AfterBegin" , str ) ;
              break
          }
       }
	else   
		document.all( "tv_panel_" + this.parent.id ).insertAdjacentHTML( "BeforeEnd" , str ) ;
	


	//如果有儿子,循环每一个儿子
    for( m = 0 ; m < this.subitems.length ; m ++ ) {
		   if( this.subitems[ m ] != null )  {
			   //把这个儿子放到栈里面
			   userstack.put( m ) ;
			   //调用这个儿子的栈方法
			   this.subitems[ m ].show() ;
			   m = userstack.get() ;
			   //alert(m);
	   	 }
	  }
	
    
}
//===========================================================
// 当单击事件发生,调用本方法,
//本方法调用类nodeitem的boxclick()方法
//===========================================================
function box_on_click( obj )  {
	nodeitems[ obj.nodeid ].boxclick() ;
}
//当点击事件发生,调用本函数
function nodeitem_boxclick()  {
     //如果没有加号或者减号,直接返回
	 if( this.status.substring( 1 ,2 ) == "0" )
       return ; 
	 //如果是关闭的状态,则打开
	 if( this.status.substring( 1 ,2 ) == "1" )   
        this.open() ;
	 //如果是打开的状态,则关闭
	 else  
        this.close() ;
}
//关闭节点
function nodeitem_close()  {
	//更新自己的状态
	this.status = this.status.substring( 0 , 1 ) + "1" + this.status.substring( 2 , 3 ) ;
	//
	document.all( "tv_panel_" + this.id ).style.display = "none" ;
   	 eval( "document.all( 'box' + this.id ).src = treeview_box_" + this.status.substring( 0 , 1 ) +"_close" ) ;
}
//打开节点
function nodeitem_open()  {
     this.status = this.status.substring( 0 , 1 ) + "2" + this.status.substring( 2 , 3 ) ;
   	 document.all( "tv_panel_" + this.id ).style.display = "" ;
   	 eval( "document.all( 'box' + this.id ).src = treeview_box_" + this.status.substring( 0 , 1 ) +"_open" ) ;
}

//向nodeitems数组中加入obj
function nodeitemRegister( obj )   {
	//nodeitems数组中加入obj
    nodeitems[ nodeitems.length ] = obj ;
	//返回id号
	return nodeitems.length - 1 ;
}


//=================================
//定义一个类stack
//metheds    :  get()
//                    put( obj )
//=================================
function stack() {
    this.value = new Array() ;
	this.cursor = 0 ;
}

function stack_get()  {
     this.cursor = this.cursor - 1 ;
	 return this.value[ this.cursor ] ;
}

function stack_put( obj )   {
      this.value[ this.cursor ] = obj ;
      this.cursor = this.cursor + 1 ;