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一个简单的javascript菜单

摘要: 一个简单的javascript菜单


HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<head>
AgetimeMenu Demo


</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  menu.barItems[i]=menu.addMenuBarItem(array[i][0],i);
  menu.addMenuPad(array[i],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  var Row=pad.insertRow(i-1);
  menu.addMenuPadItem(ary[i],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(
  "

"
  );
  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>

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