本文实例讲述了javascript动态生成树形菜单的方法。分享给大家供大家参考，具体如下：
//========================================
//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 + "' ) ; " ) ;
}
}
javascript调用
<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>
希望本文所述对大家JavaScript程序设计有所帮助。