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Heim > Web-Frontend > js-Tutorial > So generieren Sie dynamisch ein Baummenü mit Javascript_Javascript-Kenntnissen

So generieren Sie dynamisch ein Baummenü mit Javascript_Javascript-Kenntnissen

WBOY
Freigeben： 2016-05-16 15:32:30
Original
1664 Leute haben es durchsucht

Das Beispiel in diesem Artikel beschreibt die Methode zum dynamischen Generieren eines Baummenüs mithilfe von Javascript. Teilen Sie es als Referenz mit allen. Die Details lauten wie folgt: 

//========================================
//Envrionment to hold Listeners
//========================================
tv_listeners = new Array() ;
function listener( type , handler )  {
 this.type = type ;
 this.handler = handler ;
 this.id = tv_listeners.length ;
 tv_listeners[ tv_listeners.length ] = this ;
}
function addListener( type , handler ) {
  new listener( type , handler ) ; 
 }
//=== END =====
//=========================================
// Hold the top item
//=========================================
tv_topnodeitem = null ;
//===== END =======
//=========================================
//Hold nodeitems , and supply a nodeitem Register
//=========================================
nodeitems = new Array() ;
function nodeitemRegister( obj )  {
  nodeitems[ nodeitems.length ] = obj ;
 return nodeitems.length - 1 ;
}
//=== END =======
//=================================
//Custom a stack
//Class     : 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 ;
}
stack.prototype.get = stack_get ;
stack.prototype.put = stack_put ;
//=======END ==========
//=========================================
// Define a public stack
//=========================================
userstack = new stack() ;
//====== END ===========
//=========================================
//Image List
//=========================================
treeview_box_0_none = "../images/4_clos.gif" ;
treeview_box_0_line = "../images/4_none.gif" ;
treeview_box_2_open = "../images/2_open.gif" ;
treeview_box_2_none = "../images/2_none.gif" ;
treeview_box_2_close = "../images/2_clos.gif" ;
treeview_box_1_open = "../images/3_open.gif" ;
treeview_box_1_none = "../images/3_none.gif" ;
treeview_box_1_close = "../images/3_clos.gif" ;
//===============================================
//Class : nodeitem
//status------------------------1:two-direction    0:nobox    0: disactivite
//               2:three-0direction   1:close-box  1: activite
//                          2:open-box
//===============================================
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 ;
  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 sort and move up/down
function nodeitem_moveUp() {
 if (this == tv_topnodeitem) return; //topitem
 ssubitems = this.parent.subitems;
 for ( i=0; i<ssubitems.length; i++ ) {
 if( ssubitems[i] == this ) {
  break;
 }
 }
 if (i==0) return;
 ssubitems[i] = ssubitems[i-1];
 ssubitems[i-1] = this;
 if (i==ssubitems.length-1) {
 ssubitems[i-1].status = "2" + ssubitems[i-1].status.substring(1, 3);
 ssubitems[i].status = "1" + ssubitems[i].status.substring(1, 3);
 }
 /*
 itemTemp = this;
 ssubitems[this.nodeIndex-1] */
/* for ( i=0; i<ssubitems.length; i++ ) {
 if( ssubitems[i] != null && ssubitems[i].nodeIndex == (this.nodeIndex-1) )
  previousitem = ssubitems[i]
 }
 previousitem.nodeIndex = this.nodeIndex;
 this.nodeIndex = this.nodeIndex -1;
 swap(this,previousitem);
*/
 //label_on_click(this.id);
 this.parent.refresh();
 lable_on_click(this.id);
}//moveUp()
function nodeitem_moveDown() {
 if (this == tv_topnodeitem) return; //topitem
 ssubitems = this.parent.subitems;
 for ( i=0; i<ssubitems.length; i++ ) {
 if( ssubitems[i] == this ) {
  break;
 }
 }
 if (i==ssubitems.length-1) return;
 ssubitems[i] = ssubitems[i+1];
 ssubitems[i+1] = this;
 if (i==ssubitems.length-2) {
 ssubitems[i+1].status = "1" + ssubitems[i+1].status.substring(1, 3);
 ssubitems[i].status = "2" + ssubitems[i].status.substring(1, 3);
 }
 this.parent.refresh();
 lable_on_click(this.id);
}//moveDown()
/*function swap (item1, item2) {
 nodeitems[item1.id] = item2;
 nodeitems[item2.id] = item1;
 idTemp = item1.id;
 item1.id = item2.id;
 item2.id = idTemp;
}*/
//end added
function nodeitem_setTag( obj ) {
  this.tag = obj ;
}
function nodeitem_getTag() {
  return this.tag ;
}
function nodeitem_show() {
 str = "<span id = 'preface" + this.id + "'><table border='0' cellspacing='0' cellpadding='0'><tr><td>" ;
  str_f = "" ;
  for( j = this.parent ; j != null ; j = j.parent ) {
   if( j.status.substring( 0 , 1 ) == 1 )
   str_f = "<img src = '" + treeview_box_0_none + "' align='absmiddle'>" + str_f ;
    else
   str_f = "<img src = '" + treeview_box_0_line + "' align='absmiddle'>" + str_f ;
  }
  str = str + str_f ;
  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 ;
  }
  str += "' align='absmiddle' onclick='box_on_click(this)'>" ;
  if( this.img == "" )
   str += this.img ;
  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>" ; 
 str += "</span><span id = 'tv_panel_" + this.id + "' style='display:" ;
 if( this.status.substring( 1 , 2 ) == '2' )
  str += "" ;
 else
  str += "none" ;
  str += "'></span>" ;
 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 ) ;
  for( m = 0 ; m < this.subitems.length ; m ++ ) 
  if( this.subitems[ m ] != null ) {
   userstack.put( m ) ;
   this.subitems[ m ].show() ;
   m = userstack.get() ;
  }
}
function nodeitem_refresh() {
 str = "<table border='0' cellspacing='0' cellpadding='0'><tr><td>" ;
  str_f = "" ;
  for( j = this.parent ; j != null ; j = j.parent ) {
   if( j.status.substring( 0 , 1 ) == 1 )
   str_f = "<img src = '" + treeview_box_0_none + "' align='absmiddle'>" + str_f ;
    else
   str_f = "<img src = '" + treeview_box_0_line + "' align='absmiddle'>" + str_f ;
  }
 str = str + str_f ;
  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 ;
  }
  str += "' align='absmiddle' onclick='box_on_click(this)'>" ;
  if( this.img == "" )
   str += this.img ;
  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>" ; 
 document.all( "preface" + this.id ).innerHTML = str ;
  document.all( "tv_panel_" + this.id ).innerHTML = "" ;
 for( m = 0 ; m < this.subitems.length ; m ++ )
  if( this.subitems[ m ] != null ) {
   userstack.put( m ) ;
   this.subitems[ m ].show() ;
   m = userstack.get() ;
    }
}
function nodeitem_remove() {
  pparent = this.parent ;
 if( pparent == null )  {
    removenodeitem( this.id ) ;
    for(var i in document.all){
      if (document.all[i].tagName == "BODY")
       {
   document.all[i].innerHTML = "" ;
        break
       }
     }
 return ;
 }
 lastsubitem = null ;
 for( i = 0 ; i < pparent.subitems.length ; i ++ )
  if( pparent.subitems[ i ] != null ) 
   if ( pparent.subitems[ i ] == this ) 
     pparent.subitems[ i ] = null ;
      else
     lastsubitem = pparent.subitems[ i ] ;
  pparent.maxsubitem = lastsubitem ; 
 if( lastsubitem == null )  
    pparent.status = pparent.status.substring( 0 , 1 ) + "0" + pparent.status.substring( 2 , 3 ) ;
  else  
   pparent.maxsubitem.status = "1" + pparent.maxsubitem.status.substring( 1 , 3 ) ;
   removenodeitem( this.id ) ;
 //added by msb for move up/down
 arrTemp = new Array();
 j = 0;
 for ( i=0; i<pparent.subitems.length; i++ ) {
 if ( pparent.subitems[i] != null ) {
  arrTemp[j] = pparent.subitems[i];
  j++;
 }
 }
 this.parent.subitems = arrTemp;
 //end added
 pparent.refresh() ;
 //tv_topnodeitem.refresh() ;
}
function removenodeitem( id )  {
  curitem = nodeitems[ id ] ;
 nodeitems[ id ] = null ;
 for( m = 0 ; m < curitem.subitems.length ; m ++ ) 
   if( curitem.subitems[ m ] != null )  {
   userstack.put( m ) ;
   removenodeitem( curitem.subitems[ m ].id ) ;
   m = userstack.get() ;
    }
}
function nodeitem_boxclick() {
   if( this.status.substring( 1 ,2 ) == "0" )
    return ; 
 if( this.status.substring( 1 ,2 ) == "1" )  
    this.open() ;
 else 
    this.close() ;
}
function nodeitem_close() {
   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" ) ;
}
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" ) ;
}
//added by msb for the move up/down
nodeitem.prototype.moveUp = nodeitem_moveUp;
nodeitem.prototype.moveDown = nodeitem_moveDown;
//end added
nodeitem.prototype.show = nodeitem_show ;
nodeitem.prototype.refresh = nodeitem_refresh ;
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 ;
//==========================================================
// Public Methods
//==========================================================
function showTV() {
   tv_topnodeitem.show() ;
}
function findNode( key )  {
 pppp = null;
  for( i = 0 ; i < nodeitems.length ; i ++ ) {
  if( nodeitems[ i ] != null ) {
    if( nodeitems[ i ].key == key ) {
     pppp = nodeitems[ i ] ;
  }
  }
 }
  return pppp ;
}
function addNode( parentkey , key , lable , img )  {
  return new nodeitem( parentkey , key , lable , img ) ;
}
function deleteNode( key )  {
  curNode = findNode( key ) ;
 if( curNode == null )
  return false ;
  curNode.remove() ; 
  return true ;
}
//====== END ================
//===========================================================
// Events
//===========================================================
function box_on_click( obj ) {
  nodeitems[ obj.nodeid ].boxclick() ;
}
tv_curlable = null ;
tv_curlable_f = null ;
function lable_on_click( id ) {
    key = nodeitems[ id ].key ;
    if( nodeitems[ id ].parent == null )
    parentkey = "" ;
    else
    parentkey = nodeitems[ id ].parent.key ;
  if( tv_curlable != null ) {
   tv_curlable.bgColor = "transparent" ;
   tv_curlable.style.color = "#333333" ;
   tv_curlable_f.bgColor = "transparent" ;
    }
    tv_curlable = document.all("lablePanel"+id) ;
   tv_curlable.bgColor = "#000000" ;
   tv_curlable.style.color = "#FFFFFF" ;
    tv_curlable_f = document.all("f_lablePanel"+id) ;
   tv_curlable_f.bgColor = "#888888" ;
  for( i = 0 ; i < tv_listeners.length ; i ++ ) 
    if( tv_listeners[ i ].type == "click" ) {
   h = tv_listeners[ i ].handler ;
   eval( h + "( '" + key + "' , '" + parentkey + "' ) ; " ) ; 
      }
}
function lable_on_dblclick( id ) {
 key = nodeitems[ id ].key ;
    if( nodeitems[ id ].parent == null )
    parentkey = "" ;
    else
    parentkey = nodeitems[ id ].parent.key ;
  if( tv_curlable != null ) {
   tv_curlable.bgColor = "transparent" ;
   tv_curlable.style.color = "#333333" ;
   tv_curlable_f.bgColor = "transparent" ;
    }
    tv_curlable = document.all("lablePanel"+id) ;
   tv_curlable.bgColor = "#000000" ;
   tv_curlable.style.color = "#FFFFFF" ;
    tv_curlable_f = document.all("f_lablePanel"+id) ;
   tv_curlable_f.bgColor = "#888888" ;
  for( i = 0 ; i < tv_listeners.length ; i ++ ) 
    if( tv_listeners[ i ].type == "dblclick" ) {
   h = tv_listeners[ i ].handler ;
   eval( h + "( '" + key + "' , '" + parentkey + "' ) ; " ) ; 
      }
}
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Javascript-Aufruf

<script language="javascript">
<!--
 addNode(-1,0,"hehe","../images/top.gif");
 addNode(0,1,"haha","../images/top.gif");
 addNode(0,2,"haha","../images/top.gif");
 addNode(1,3,"haha","../images/top.gif");
 addNode(1,4,"haha","../images/top.gif");
 addNode(2,5,"haha","../images/top.gif");
 addNode(2,6,"haha","../images/top.gif");
 showTV();
-->
</script>
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Ich hoffe, dass dieser Artikel für alle hilfreich ist, die sich mit der JavaScript-Programmierung befassen.

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