JS代码实现隐藏式菜单效果

2012-11-02 来源：网络

【实例名称】

隐藏式菜单

【实例描述】

菜单是网站的常用导航形式，为了保证页面的整体效果，有时候需要将菜单隐藏起来。当用户需要的时侯再显示出来。本例学习如何制作隐藏式菜单。

【实例代码】

 
<html>
<head>
<TITLE>隐藏式菜单-学无忧（www.xue51.com）</title>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
</HEAD>
<BODY>
<SCRIPT language="javascript">
//状态栏显示信息
function MM_displayStatusMsg(msgStr) 
{ 
 status=msgStr;
 document.MM_returnValue = true;
}
//高亮显示
function highlight(x)
{
document.forms[x].elements[0].focus()
document.forms[x].elements[0].select()
}
//菜单弹出时的处理
function MM_jumpMenu(targ,selObj,restore)
{ 
 eval(targ+".location='"+selObj.
options[selObj.selectedIndex].value+"'");
 if (restore) selObj.selectedIndex=0;
}
var NS;
IE=document.all;
NS=document.layers;
hdrFontFamily="Verdana";
hdrFontSize="2";
hdrFontColor="white";
hdrBGColor="#CCCCCC";
linkFontFamily="Verdana";
linkFontSize="2";
linkBGColor="white";
linkOverBGColor="#CCCCCC";
linkTarget="_top";
YOffset=60;
staticYOffset=20;
menuBGColor="#CCCCCC";
menuIsStatic="no";
menuHeader="主流索引"
menuWidth=150; 
staticMode="advanced"
barBGColor="#C0C0C0";
barFontFamily="Verdana";
barFontSize="2";
barFontColor="white";
barText="导航菜单";
//鼠标移走时的菜单处理
function moveOut() 
{
if (window.cancel)
{ cancel="";}
if (window.moving2)
 { clearTimeout(moving2);
  moving2="";
  }
if ((IE && ssm2.style.pixelLeft<0)||(NS && document.ssm2.left<0)) 
{
 if (IE) {ssm2.style.pixelLeft += (5%menuWidth);
}
if (NS) 
{
 document.ssm2.left += (5%menuWidth);
}
moving1 = setTimeout('moveOut()', 5)
}
else {
 clearTimeout(moving1)
 }
};
function moveBack() {
 cancel = moveBack1()
}
function moveBack1() {
 if (window.moving1) {
 clearTimeout(moving1)
}
if ((IE && ssm2.style.pixelLeft>
(-menuWidth))||(NS && document.ssm2.left>(-150))) {
 if (IE) {ssm2.style.pixelLeft -= (5%menuWidth);
}
if (NS) {
 document.ssm2.left -= (5%menuWidth);
}
moving2 = setTimeout('moveBack1()', 5)}
 else {
 clearTimeout(moving2)
 }
};
lastY = 0;
//根据浏览器类型设置菜单模式
function makeStatic(mode) {
if (IE) {winY = document.body.scrollTop;var NM=ssm2.style
}
if (NS) {winY = window.pageYOffset;var NM=document.ssm2
}
if (mode=="smooth") {
 if ((IE||NS) && winY!=lastY) {
 smooth = .2 * (winY - lastY);
 if(smooth > 0) smooth = Math.ceil(smooth);
 else smooth = Math.floor(smooth);
 if (IE) NM.pixelTop+=smooth;
 if (NS) NM.top+=smooth;
 lastY = lastY+smooth;
}
setTimeout('makeStatic("smooth")', 1)
}
else if (mode=="advanced") {
 if ((IE||NS) && winY>YOffset-staticYOffset) {
 if (IE) {NM.pixelTop=winY+staticYOffset
 }
if (NS) {NM.top=winY+staticYOffset
 }
}
else {
 if (IE) {NM.pixelTop=YOffset}
 if (NS) {NM.top=YOffset-7 }
}
setTimeout('makeStatic("advanced")', 1)
 }
}
//根据浏览器类型初始化菜单
function init() {
if (IE) {
ssm2.style.pixelLeft = -menuWidth;
ssm2.style.visibility = "visible"
}
else if (NS) {
document.ssm2.left = -menuWidth;
document.ssm2.visibility = "show"
}
else {
alert('浏览器类型判断错误!')
}
}
//当用户选择菜单时，在状态栏提示导航地址
function MM_displayStatusMsg(msgStr) { 
 status=msgStr;
 document.MM_returnValue = true;
}
//判断浏览器类型
if (IE) {document.write('<DIV ID="ssm2" 
style="visibility:hidden;Position : Absolute ;
Left : 0px ;Top : '+YOffset+'px ;Z-Index : 20;
width:1px" onmouseover="moveOut()" onmouseout="moveBack()">')}
if (NS) {document.write('<LAYER visibility="hide" top="'+
YOffset+'" name="ssm2" bgcolor="'+menuBGColor+'" left="0" 
onmouseover="moveOut()" onmouseout="moveBack()">')}
tempBar="";
for (i=0;i<barText.length;i++) {
tempBar+=barText.substring(i, i+1)+"<BR>"}
document.write('<table border="0" cellpadding="0" 
cellspacing="1" width="'+(menuWidth+16+2)+'" 
bgcolor="'+menuBGColor+'"><tr><td bgcolor="'+hdrBGColor+'" 
WIDTH="'+menuWidth+'"> <font face="'+hdrFontFamily+'" 
Size="'+hdrFontSize+'" COLOR="'+hdrFontColor+'"><b>'+
menuHeader+'</b></font></td><td align="center" rowspan="100" 
width="16" bgcolor="'+barBGColor+'"><p align="center">
<font face="'+barFontFamily+'" Size="'+barFontSize+'" 
COLOR="'+barFontColor+'"><B>'+tempBar+'</B></font></p></TD></tr>')
//添加菜单内容项的方法
function addItem(text, link, target) 
{
if (!target) {target=linkTarget}
document.write('<TR><TD BGCOLOR="'+linkBGColor+'" 
onmouseover="bgColor=\''+linkOverBGColor+'\'" 
onmouseout="bgColor=\''+linkBGColor+'\'"><ILAYER>
<LAYER onmouseover="bgColor=\''+linkOverBGColor+'\'" 
onmouseout="bgColor=\''+linkBGColor+'\'" WIDTH="100%">
<FONT face="'+linkFontFamily+'" Size="'+linkFontSize+'"> 
<A HREF="'+link+'" target="'+target+'" CLASS="ssm2Items">'+
text+'</A></FONT></LAYER></ILAYER></TD></TR>')
}
//为菜单添加分类标题的方法
function addHdr(text)
 {
 document.write('<tr><td bgcolor="'+hdrBGColor+'" WIDTH="140"> 
<font face="'+hdrFontFamily+'" Size="'+hdrFontSize+'" 
COLOR="'+hdrFontColor+'"><b>'+text+'</b></font></td></tr>')
 }
//下面是菜单内容和指定的导航地址
addItem('初级搜索', 'http://www.google.com', '');
addItem('中级搜索', 'http://www.google.com', '');
addItem('搜索原理', 'http://www.google.com', '');
addItem('深入搜索', 'http://www.google.com', '');
addItem('垂直搜索', 'http://www.google.com', '_blank');
addHdr('帮助');  //菜单标题
addItem('会员专属论坛', 'http://www.google.com', '_blank');
document.write('<tr><td bgcolor="'+hdrBGColor+'">
<font size="0" face="Arial"> </font></td></TR></table>')
if (IE) {document.write('</DIV>')}
if (NS) {document.write('</LAYER>')}
if ((IE||NS) && (menuIsStatic=="yes"&&staticMode)) 
{makeStatic(staticMode);}
window.onload=init;
</SCRIPT>
本例中用到的样式代码如下所示：
<STYLE>
#ssm2 A 
{ FONT-SIZE: 12px; COLOR: #808080; FONT-FAMILY: verdana; TEXT-DECORATION: none}
#ssm2 A:hover
 { COLOR: #ccff33}
</STYLE>

</body>
</html>