java教程：一个简单的javascript菜单
<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
<head>
<title>agetimemenu demo</title>
<meta http-equiv="content-type" content="text/html; charset=gb2312">
<style>
.agetime_bar{
position:absolute;top:0px;left:0px;height:22px;width:100%;border:1px outset;background-color:rgb(212,208,200);z-index:98;
}
.agetime_baritem{
width:60px;height:20px;border:1px solid rgb(212,208,200);text-align:left;padding-left:10px;
background:rgb(212,208,200);color:#000000;font-size:9pt;
}
.agetime_baritemdown{
width:60px;height:20px;border:1px inset rgb(212,208,200);text-align:left;padding-left:10px;
background:#f0f0f0;color:#000000;font-size:9pt;
}
.agetime_baritemhover{
width:60px;height:20px;border:1 outset;text-align:left;padding-left:10px;
background:#f0f0f0;color:#000000;font-size:9pt;
}
.agetime_pad{
cursor:default;font-size:9pt;width:100%;
}
.agetime_paditem{
width:100%;height:18px;border:1px solid rgb(212,208,200);text-align:left;padding-left:10px;
background:rgb(212,208,200);color:#000000;font-size:9pt;
}
.agetime_paditemfalse{
padding-left:10px;font-size:9pt; color:#808080;
}
.agetime_paditemfalsehover{
padding-left:10px;font-size:9pt; color:#808080;background-color:#333366;
}
.agetime_paditemhover{
width:100%;height:18px;text-align:left;padding-left:10px;
background-color:#333366;color:#ffffff;font-size:9pt;
}
.agetime_paditemdown{
width:100%;height:18px;text-align:left;padding-left:10px;border:1px inset;
background-color:#9999cc;color:#ffffff;font-size:9pt;
}
.agetime_hr{
border:1px inset;
}
.agetime_board{
background-color:rgb(212,208,200);border:2px outset;
}
</style>
</head>
<body>
<script language="javascript">
var menu = agetimemenu("agetime",
[
[
["文件",null,null,true,"打开文件"], //显示文字,方法,命令,状态,状栏显示文字
["打开",null,null,false,"打开文件"],
["--"],
["你好","js","alert('hello')",true,"一声问候"],
["新窗口","abc","about:blank",true,"弹出abc窗口"],
["空白",null,"about:blank",true,"在当前窗口显示空白页"]
],
[
["编辑",null,null,false,"打开文件"],
["撤消",null,null,true,"打开文件"],
["重做",null,null,true,"打开文件"]
],
[
["文件","js","alert('无子菜单')",true,"打开文件"]
]
]
);
//方法为"js"时,命令则为javascript语句,为非"js"值时,命令则是一个url,而打开这个url的目标位置则是方法所指定的窗口;
//["你好","js","alert('hello'),true,"一声问候"];
//显示文字为"--"是按钮是一个分隔符;
function agetimemenu(id,array){
var menu=this;
menu.pad=null; //装载各个子菜单
menu.baritems=[]; //菜单条的各位按钮
menu.pads=[]; //每个子菜单为一个table存放于menu.pad上;
menu.selectedindex=-1; //菜单条选中按钮的索引值
menu.board=null; //子菜单面板
//建立菜单条
this.crtmenubar=function(){
var len=array.length;
menu.bar = document.body.appendchild(document.createelement('div'));
menu.bar.classname=id+"_bar";
for(var i=0;i<len;i++){
menu.baritems=menu.addmenubaritem(array[0],i);
menu.addmenupad(array,i);
}
}
//子菜单
this.addmenupad=function(ary,index){
var len=ary.length;
var pad=menu.crtelement("table",menu.pad);
pad.cellspacing=1; pad.cellpadding=0;
pad.classname=id+"_pad";
pad.style.display="none";
for(var i=1;i<len;i++){
var row=pad.insertrow(i-1);
menu.addmenupaditem(ary,row);
}
menu.pads[index]=pad;
}
//各子菜单按钮
this.addmenupaditem=function(ary,row){
var cell=row.insertcell(0);
if(ary[0]!="--"){
cell.innertext=ary[0];
if(ary[3]){ //有效状态;
cell.classname=id+"_paditem";
cell.onmouseover=function(){
cell.classname=id+"_paditemhover";
window.status=ary[4];
}
cell.onmouseout=function(){
cell.classname=id+"_paditem";
window.status="";
}
cell.onmousedown=function(){ cell.classname=id+"_paditemdown"; }
cell.onmouseup=function(){
cell.classname=id+"_paditemhover";
menu.hidemenu();
menu.execute(ary);
}
}
else{ //按钮无效;
cell.classname=id+"_paditemfalse";
cell.onmouseover=function(){
cell.classname=id+"_paditemfalsehover";
window.status=ary[4];
}
cell.onmouseout=function(){
cell.classname=id+"_paditemfalse";
window.status="";
}
}
}
else{
var hr=menu.crtelement("hr",cell);
hr.classname=id+"_hr";
}
cell.onclick=function(){
event.cancelbubble=true;
}
}
//菜单条的按钮
this.addmenubaritem=function(ary,index){
var item=menu.crtelement("button",menu.bar);
item.value=ary[0];
item.disabled=!ary[3];
item.classname=id+"_baritem";
item.onmouseover=function(){
if(menu.selectedindex==-1){
item.classname=id+"_baritemhover";
}
else{
menu.baritems[selectedindex].classname=id+"_baritem";
item.classname=id+"_baritemdown";
menu.showmenu(index);
}
window.status=ary[4];
}
item.onmouseout=function(){
if(menu.selectedindex==-1) item.classname=id+"_baritem";
window.status="";
}
item.onclick=function(){
event.cancelbubble=true;
if(menu.selectedindex==-1){
item.classname=id+"_baritemdown";
menu.showmenu(index);
}
else{
menu.hidemenu();
item.classname=id+"_baritemhover";
}
menu.execute(ary);
item.blur();
}
return item;
}
//显示子菜单
this.showmenu=function(index){
if(menu.selectedindex!=-1) menu.pads[selectedindex].style.display="none";
menu.board.style.pixelleft=menu.baritems[index].offsetleft+2;
//menu.board.style.pixelheight="";
if(menu.pads[index].rows.length>0) menu.board.style.display="";
else menu.board.style.display="none";
menu.pads[index].style.display="";
menu.selectedindex=index;
}
//隐藏子菜单
this.hidemenu=function(){
if(menu.selectedindex==-1) return;
menu.baritems[menu.selectedindex].classname=id+"_baritem";
menu.pads[selectedindex].style.display="none";
menu.selectedindex=-1;
menu.board.style.display="none";
}
//执行菜单命令;
this.execute=function(ary){
if(ary[2]==null) return;
if(ary[1]=="js") { eval(ary[2]); menu.hidemenu(); }
else if(ary[1]==null || ary[1].tolowercase=="_self") location.href=ary[2];
else{ var x=window.open(ary[2],ary[1]); x.focus(); }
}
//建立子菜单的显示面板
this.crtmenuboard=function(){
document.write(
"<div id='"+id+"_board' style='position:absolute;width:160px;height:10px;left:0px;top:20px;background-color:#666666;z-index:99;display:none;'>"+
"<div style='position:absolute;width:100%;height:100%;left:0px;top:0px;'>"+
"<iframe id='"+id+"_frame' name='"+id+"_frame' width='100%' height='100%' frameborder='0' scrolling='no'></iframe>"+
"</div>"+
"<div id='"+id+"_pad' style='position:absolute;width:100%;height:100%;left:0px;top:0px;'></div>"+
"</div>"
);
menu.board=document.getelementbyid(id+"_board");
menu.pad=document.getelementbyid(id+"_pad");
menu.pad.classname=id+"_board";
menu.pad.onselectstart=function(){ return false;}
}
//增加对像的一个子元素
this.crtelement=function(el,p){
return p.appendchild(document.createelement(el));
}
//安装菜单;
this.setup=function(){
menu.crtmenuboard();
menu.crtmenubar();
document.attachevent("onclick",menu.hidemenu);
}
menu.setup();
}
</script>
</body>
</html>
