动感的伸缩菜单

网站 2005-10-12 10:22

页面：点这儿参观

在某知名网站看到的菜单效果，的确很不错。有动感效果，修改方便，而且美观大方。看看上方的菜单效果就
知了，制作方法如下：
制作方法
将下面的代码复制到<head>~</head>里，请下载 welab.css 文件下载后将.jpg改为.rar

图片如下：

mtDropDown.reference = {topLeft:1,topRight:2,bottomLeft:3,bottomRight:4};
mtDropDown.direction = {down:1,right:2};
mtDropDown.registry = [];
mtDropDown._maxZ = 100;

mtDropDown.isSupported = function() {
if (typeof mtDropDown.isSupported.r == "boolean") 
return mtDropDown.isSupported.r;
var ua = navigator.userAgent.toLowerCase();
var an = navigator.appName;
var r = false;
if (ua.indexOf("gecko") > -1) r = true; 
else if (an == "Microsoft Internet Explorer") {
if (document.getElementById) r = true; 
}
mtDropDown.isSupported.r = r;
return r;
}

mtDropDown.initialize = function() {
for (var i = 0, menu = null; menu = this.registry[i]; i++) {
menu.initialize();
}
}

mtDropDown.renderAll = function() {
var aMenuHtml = [];
for (var i = 0, menu = null; menu = this.registry[i]; i++) {
aMenuHtml[i] = menu.toString();
}
document.write(aMenuHtml.join(""));
}

function mtDropDown(oActuator, iDirection, iLeft, iTop, iReferencePoint, parentMenuSet) {

this.addItem = addItem;
this.addMenu = addMenu;
this.toString = toString;
this.initialize = initialize;
this.isOpen = false;
this.show = show;
this.hide = hide;
this.items = [];

this.onactivate = new Function(); 
this.ondeactivate = new Function(); 
this.onmouseover = new Function(); 
this.onqueue = new Function();

this.index = mtDropDown.registry.length;
mtDropDown.registry[this.index] = this;
var id = "mtDropDown" + this.index;
var contentHeight = null;
var contentWidth = null;
var childMenuSet = null;
var animating = false;
var childMenus = [];
var slideAccel = -1;
var elmCache = null;
var ready = false;
var _this = this;
var a = null;
var pos = iDirection == mtDropDown.direction.down ? "top" : "left";
var dim = null;

if (ready) {
_this.isOpen = true;
animating = true;
setContainerPos();
elmCache["clip"].style.visibility = "visible";
elmCache["clip"].style.zIndex = mtDropDown._maxZ++;

slideStart();
_this.onactivate();
}
}
function hide() {
if (ready) {
_this.isOpen = false;
animating = true;
for (var i = 0, item = null; item = elmCache.item[i]; i++) 
dehighlight(item);
if (childMenuSet) childMenuSet.hide();
slideStart();
_this.ondeactivate();
}
}
function setContainerPos() {
var sub = oActuator.constructor == mtDropDownItem; 
var act = sub ? oActuator.parentMenu.elmCache["item"][oActuator._index] : oActuator; 
var el = act;
var x = 0;
var y = 0;
var minX = 0;
var maxX = (window.innerWidth ? window.innerWidth : document.body.clientWidth) - parseInt(elmCache["clip"].style.width);
var minY = 0;
var maxY = (window.innerHeight ? window.innerHeight : document.body.clientHeight) - parseInt(elmCache["clip"].style.height);

while (sub ? el.parentNode.className.indexOf("mtDropdownMenu") == -1 : el.offsetParent) {
x += el.offsetLeft;
y += el.offsetTop;
if (el.scrollLeft) x -= el.scrollLeft;
if (el.scrollTop) y -= el.scrollTop;
el = el.offsetParent;
}
if (oActuator.constructor == mtDropDownItem) {
x += parseInt(el.parentNode.style.left);
y += parseInt(el.parentNode.style.top);
}
switch (iReferencePoint) {
case mtDropDown.reference.topLeft:
break;
case mtDropDown.reference.topRight:
x += act.offsetWidth;
break;
case mtDropDown.reference.bottomLeft:
y += act.offsetHeight;
break;
case mtDropDown.reference.bottomRight:
x += act.offsetWidth;
y += act.offsetHeight;
break;
}
x += iLeft;
y += iTop;
x = Math.max(Math.min(x, maxX), minX);
y = Math.max(Math.min(y, maxY), minY);
elmCache["clip"].style.left = x + "px";
elmCache["clip"].style.top = y + "px";
}
function slideStart() {
var x0 = parseInt(elmCache["content"].style[pos]);
var x1 = _this.isOpen ? 0 : -dim;
if (a != null) a.stop();
a = new Accelimation(x0, x1, mtDropDown.slideTime, slideAccel);
a.onframe = slideFrame;
a.onend = slideEnd;
a.start();
}
function slideFrame(x) {
elmCache["content"].style[pos] = x + "px";
}
function slideEnd() {
if (!_this.isOpen) elmCache["clip"].style.visibility = "hidden";
animating = false;
}
function initSize() {

var ow = elmCache["items"].offsetWidth;
var oh = elmCache["items"].offsetHeight;
var ua = navigator.userAgent.toLowerCase();

elmCache["clip"].style.width = ow + mtDropDown.shadowSize + 2 + "px";
elmCache["clip"].style.height = oh + mtDropDown.shadowSize + 2 + "px";

elmCache["content"].style.width = ow + mtDropDown.shadowSize + "px";
elmCache["content"].style.height = oh + mtDropDown.shadowSize + "px";
contentHeight = oh + mtDropDown.shadowSize;
contentWidth = ow + mtDropDown.shadowSize;
dim = iDirection == mtDropDown.direction.down ? contentHeight : contentWidth;

elmCache["content"].style[pos] = -dim - mtDropDown.shadowSize + "px";
elmCache["clip"].style.visibility = "hidden";

if (ua.indexOf("mac") == -1 || ua.indexOf("gecko") > -1) {

elmCache["background"].style.width = ow + "px";
elmCache["background"].style.height = oh + "px";
elmCache["background"].style.backgroundColor = mtDropDown.backgroundColor;

elmCache["shadowRight"].style.left = ow + "px";
elmCache["shadowRight"].style.height = oh - (mtDropDown.shadowOffset - mtDropDown.shadowSize) + "px";
elmCache["shadowRight"].style.backgroundColor = mtDropDown.shadowColor;

elmCache["shadowBottom"].style.top = oh + "px";
elmCache["shadowBottom"].style.width = ow - mtDropDown.shadowOffset + "px";
elmCache["shadowBottom"].style.backgroundColor = mtDropDown.shadowColor;
}

else {

elmCache["background"].firstChild.src = mtDropDown.backgroundPng;
elmCache["background"].firstChild.width = ow;
elmCache["background"].firstChild.height = oh;

elmCache["shadowRight"].firstChild.src = mtDropDown.shadowPng;
elmCache["shadowRight"].style.left = ow + "px";
elmCache["shadowRight"].firstChild.width = mtDropDown.shadowSize;
elmCache["shadowRight"].firstChild.height = oh - (mtDropDown.shadowOffset - mtDropDown.shadowSize);

elmCache["shadowBottom"].firstChild.src = mtDropDown.shadowPng;
elmCache["shadowBottom"].style.top = oh + "px";
elmCache["shadowBottom"].firstChild.height = mtDropDown.shadowSize;
elmCache["shadowBottom"].firstChild.width = ow - mtDropDown.shadowOffset;
}
}
function initCache() {
var menu = document.getElementById(id);
var all = menu.all ? menu.all : menu.getElementsByTagName("*"); 
elmCache = {};
elmCache["clip"] = menu;
elmCache["item"] = [];
for (var i = 0, elm = null; elm = all[i]; i++) {
switch (elm.className) {
case "items":
case "content":
case "background":
case "shadowRight":
case "shadowBottom":
elmCache[elm.className] = elm;
break;
case "item":
elm._index = elmCache["item"].length;
elmCache["item"][elm._index] = elm;
break;
}
}

_this.elmCache = elmCache;
}
function initEvents() {

for (var i = 0, item = null; item = elmCache.item[i]; i++) {
item.onmouseover = item_mouseover;
item.onmouseout = item_mouseout;
item.onclick = item_click;
}

if (typeof oActuator.tagName != "undefined") {

oActuator.onmouseover = actuator_mouseover;
oActuator.onmouseout = actuator_mouseout;
}

elmCache["content"].onmouseover = content_mouseover;
elmCache["content"].onmouseout = content_mouseout;
}
function highlight(oRow) {
oRow.className = "item hover";
if (childMenus[oRow._index]) 
oRow.lastChild.firstChild.src = mtDropDown.dingbatOn;
}
function dehighlight(oRow) {
oRow.className = "item";
if (childMenus[oRow._index]) 
oRow.lastChild.firstChild.src = mtDropDown.dingbatOff;
}
function item_mouseover() {
if (!animating) {
highlight(this);
if (childMenus[this._index]) 
childMenuSet.showMenu(childMenus[this._index]);
else if (childMenuSet) childMenuSet.hide();
}
}
function item_mouseout() {
if (!animating) {
if (childMenus[this._index])
childMenuSet.hideMenu(childMenus[this._index]);
else 
dehighlight(this);
}
}
function item_click() {
if (!animating) {
if (_this.items[this._index].url) 
location.href = _this.items[this._index].url;
}
}
function actuator_mouseover() {
parentMenuSet.showMenu(_this);
}
function actuator_mouseout() {
parentMenuSet.hideMenu(_this);
}
function content_mouseover() {
if (!animating) {
parentMenuSet.showMenu(_this);
_this.onmouseover();
}
}
function content_mouseout() {
if (!animating) {
parentMenuSet.hideMenu(_this);
}
}
function child_mouseover() {
if (!animating) {
parentMenuSet.showMenu(_this);
}
}
function child_deactivate() {
for (var i = 0; i < childMenus.length; i++) {
if (childMenus[i] == this) {
dehighlight(elmCache["item"][i]);
break;
}
}
}
function child_queue() {
parentMenuSet.hideMenu(_this);
}
function toString() {
var aHtml = [];
var sClassName = "mtDropdownMenu" + (oActuator.constructor != mtDropDownItem ? " top" : "");
for (var i = 0, item = null; item = this.items[i]; i++) {
aHtml[i] = item.toString(childMenus[i]);
}
return '<div id="' + id + '" class="' + sClassName + '">' + 
'<div class="content"><table class="items" cellpadding="0" cellspacing="0" border="0">' + 
'<tr><td colspan="2"><img src="' + mtDropDown.spacerGif + '" width="1" height="' + mtDropDown.menuPadding + '"></td></tr>' + 
aHtml.join('') + 
'<tr><td colspan="2"><img src="' + mtDropDown.spacerGif + '" width="1" height="' + mtDropDown.menuPadding + '"></td></tr></table>' + 
'<div class="shadowBottom"><img src="' + mtDropDown.spacerGif + '" width="1" height="1"></div>' + 
'<div class="shadowRight"><img src="' + mtDropDown.spacerGif + '" width="1" height="1"></div>' + 
'<div class="background"><img src="' + mtDropDown.spacerGif + '" width="1" height="1"></div>' + 
'</div></div>';
}
}

mtDropDownSet.registry = [];
function mtDropDownSet(iDirection, iLeft, iTop, iReferencePoint) {

this.addMenu = addMenu;
this.showMenu = showMenu;
this.hideMenu = hideMenu;
this.hide = hide;

var menus = [];
var _this = this;
var current = null;
this.index = mtDropDownSet.registry.length;
mtDropDownSet.registry[this.index] = this;

function addMenu(oActuator) {
var m = new mtDropDown(oActuator, iDirection, iLeft, iTop, iReferencePoint, this);
menus[menus.length] = m;
return m;
}
function showMenu(oMenu) {
if (oMenu != current) {

if (current != null) hide(current);

current = oMenu;

oMenu.show();
}
else {

cancelHide(oMenu);
}
}
function hideMenu(oMenu) {

if (current == oMenu && oMenu.isOpen) {

if (!oMenu.hideTimer) scheduleHide(oMenu);
}
}
function scheduleHide(oMenu) {

oMenu.onqueue();
oMenu.hideTimer = window.setTimeout("mtDropDownSet.registry[" + _this.index + "].hide(mtDropDown.registry[" + oMenu.index + "])", mtDropDown.hideDelay);
}
function cancelHide(oMenu) {

if (oMenu.hideTimer) {
window.clearTimeout(oMenu.hideTimer);
oMenu.hideTimer = null;
}
}
function hide(oMenu) { 
if (!oMenu && current) oMenu = current;
if (oMenu && current == oMenu && oMenu.isOpen) {

cancelHide(oMenu);
current = null;
oMenu.hideTimer = null;
oMenu.hide();
}
}
}

function mtDropDownItem(sText, sUrl, oParent) {
this.toString = toString;
this.text = sText;
this.url = sUrl;
this.parentMenu = oParent;
function toString(bDingbat) {
var sDingbat = bDingbat ? mtDropDown.dingbatOff : mtDropDown.spacerGif;
var iEdgePadding = mtDropDown.itemPadding + mtDropDown.menuPadding;
var sPaddingLeft = "padding:" + mtDropDown.itemPadding + "px; padding-left:" + iEdgePadding + "px;"
var sPaddingRight = "padding:" + mtDropDown.itemPadding + "px; padding-right:" + iEdgePadding + "px;"
return '<tr class="item"><td nowrap style="' + sPaddingLeft + '">' + 
sText + '</td></tr>';

//sText + '</td><td width="14" style="' + sPaddingRight + '">' + 
//'</td></tr>';
}
}

function Accelimation(from, to, time, zip) {
if (typeof zip == "undefined") zip = 0;
if (typeof unit == "undefined") unit = "px";
this.x0 = from;
this.x1 = to;
this.dt = time;
this.zip = -zip;
this.unit = unit;
this.timer = null;
this.onend = new Function();
this.onframe = new Function();
}

Accelimation.prototype.start = function() {
this.t0 = new Date().getTime();
this.t1 = this.t0 + this.dt;
var dx = this.x1 - this.x0;
this.c1 = this.x0 + ((1 + this.zip) * dx / 3);
this.c2 = this.x0 + ((2 + this.zip) * dx / 3);
Accelimation._add(this);
}

Accelimation.prototype.stop = function() {
Accelimation._remove(this);
}

Accelimation.prototype._paint = function(time) {
if (time < this.t1) {
var elapsed = time - this.t0;
this.onframe(Accelimation._getBezier(elapsed/this.dt,this.x0,this.x1,this.c1,this.c2));
}
else this._end();
}

Accelimation.prototype._end = function() {
Accelimation._remove(this);
this.onframe(this.x1);
this.onend();
}

Accelimation._add = function(o) {
var index = this.instances.length;
this.instances[index] = o;

if (this.instances.length == 1) {
this.timerID = window.setInterval("Accelimation._paintAll()", this.targetRes);
}
}

Accelimation._remove = function(o) {
for (var i = 0; i < this.instances.length; i++) {
if (o == this.instances[i]) {
this.instances = this.instances.slice(0,i).concat( this.instances.slice(i+1) );
break;
}
}

if (this.instances.length == 0) {
window.clearInterval(this.timerID);
this.timerID = null;
}
}

Accelimation._paintAll = function() {
var now = new Date().getTime();
for (var i = 0; i < this.instances.length; i++) {
this.instances[i]._paint(now);
}
}

Accelimation._B1 = function(t) { return t*t*t }
Accelimation._B2 = function(t) { return 3*t*t*(1-t) }
Accelimation._B3 = function(t) { return 3*t*(1-t)*(1-t) }
Accelimation._B4 = function(t) { return (1-t)*(1-t)*(1-t) }

Accelimation._getBezier = function(percent,startPos,endPos,control1,control2) {
return endPos * this._B1(percent) + control2 * this._B2(percent) + control1 * this._B3(percent) + startPos * this._B4(percent);
}

Accelimation.instances = [];
Accelimation.targetRes = 10;
Accelimation.timerID = null;
//-->
</script>
<script language=javascript>
<!--
//dropdown_initialize.js
		var preloaded = [];

for (var i = 1; i <= 8; i++) {
			preloaded[i] = [loadImage(i + "-1.gif"), loadImage(i + "-1.gif")];		//设置图片的OnMouseOver和OnMouseOut的路径
		}

function init() {

if (mtDropDown.isSupported()) {
				mtDropDown.initialize();

//				menu1.onactivate = function() { swapImage("button1", preloaded[1][1].src) };
//				menu1.ondeactivate = function() { swapImage("button1", preloaded[1][0].src) };

//				menu2.onactivate = function() { swapImage("button2", preloaded[2][1].src) };
//				menu2.ondeactivate = function() { swapImage("button2", preloaded[2][0].src) };

//				menu3.onactivate = function() { swapImage("button3", preloaded[3][1].src) };
//				menu3.ondeactivate = function() { swapImage("button3", preloaded[3][0].src) };

//				menu4.onactivate = function() { swapImage("button4", preloaded[4][1].src) };
//				menu4.ondeactivate = function() { swapImage("button4", preloaded[4][0].src) };

//				menu5.onactivate = function() { swapImage("button5", preloaded[5][1].src) };
//				menu5.ondeactivate = function() { swapImage("button5", preloaded[5][0].src) };

//				menu6.onactivate = function() { swapImage("button6", preloaded[6][1].src) };
//				menu6.ondeactivate = function() { swapImage("button6", preloaded[6][0].src) };

//				menu7.onactivate = function() { swapImage("button7", preloaded[7][1].src) };
//				menu7.ondeactivate = function() { swapImage("button7", preloaded[7][0].src) };
				
//				menu8.onactivate = function() { swapImage("button8", preloaded[8][1].src) };
//				menu8.ondeactivate = function() { swapImage("button8", preloaded[8][0].src) };

}
		}

function loadImage(sFilename) {
			var img = new Image();
			img.src ="" + sFilename;
			return img;
		}

function swapImage(imgName, sFilename) {
			document.images[imgName].src = sFilename;
		}
//-->
</script>
<link href="welab.css" type=text/css rel=stylesheet>

[Ctrl+A 全部选择提示：你可先修改部分代码，再按运行]

制作导航列表的一组图片，插入在<body>~<body>里

<table width="100%" border="0" align="center" cellpadding="0" cellspacing="0">
  <tr> 
    <td height="49"> 
    </td>
    <td width="74" valign="bottom" ><a id=menu1 href="#"><img src="1-1.gif" width="74" height="20" border="0"></a></td>
    <td width="74" valign="bottom"><a id=menu2 href="#"><img src="2-1.gif" width="74" height="20" border="0"></a></td>
    <td width="74" valign="bottom"><a id=menu3 href="#"><img src="3-1.gif" width="74" height="20" border="0"></a></td>
    <td width="74" valign="bottom"><a id=menu4 href="#"><img src="4-1.gif" width="74" height="20" border="0"></a></td>
    <td width="74" valign="bottom"><a id=menu5 href="#"><img src="5-1.gif" width="74" height="20" border="0"></a></td>
    <td width="74" valign="bottom"><a id=menu6 href="#"><img src="6-1.gif" width="74" height="20" border="0"></a></td>
    <td width="74" valign="bottom"><a id=menu7 href="#"><img src="7-1.gif" width="74" height="20" border="0"></a></td>
  </tr>
  <tr bgcolor="#7285cf"> 
    <td colspan="8" height="20">　<font color="#FFFFFF">动感的伸缩菜单</font></td>
  </tr>
</table>

[Ctrl+A 全部选择提示：你可先修改部分代码，再按运行]

在步骤2的下面插入一 dropdown_content.js 文件下载jpg文件改名成.js

图片如下：

修改页面载入属性，在<body>里定义onload属性：

[Ctrl+A 全部选择提示：你可先修改部分代码，再按运行]

实例注释：
特效的功能分成三块分别放在主页面、welab.css、dropdown_content.js 里了。
主页面－用来定义菜单的效果和主函数的程序；
welab.css －－用来定义菜单的图层的风格设置；
dropdown_content.js －－用来定义每组菜单内的内容。

如果添加一组新的菜单：
1、在步骤2中加一入一个图片，并加入链接，定义ID值为menu8（因为实例中有7组菜单了）：
<a id=menu8 href="#"><img src="7-1.gif" width="74" height="20" border="0"></a>
--------------------------------------------------------------------------------
2、在dropdown_content.js 文件中复制 menu7 的内容并修改成 menu8 的菜单内容：
var menu8 = ms.addMenu(document.getElementById("menu8"));
menu8.addItem(" 菜单八的内容", "#");
menu8.addItem(" 菜单八的内容", "#");

至此你就可以完成这个实例了，快去试试吧！

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