Есть меню, код которого взят с сайта
http://www.dynamicdrive.com/dynamicindex1/slashdot.htm . Знания не позволяют особенно модернизировать этот код (на мой взгляд, скрипт можно было упростить), поэтому оставил практически без изменения. В основном все устраивает. Однако, скорость раскрытия и закрытия этого меню почему-то резко уменьшается при добавлении в шапку страницы рисунка. Чем это объясняется и что можно предпринять.
Код страницы:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<
html xmlns="
http://www.w3.org/1999/xhtml">
<
head>
<
meta http-equiv="
Content-Type" content="
text/html; charset=windows-1251" />
<
title>Slashdot's Menu<
/title>
<
link rel="
stylesheet" type="
text/css" href="
sdmenu/sdmenu.css" />
<
script type="
text/javascript" src="
sdmenu/sdmenu.js">
/***********************************************
* Slashdot Menu script- By DimX
* Submitted to Dynamic Drive DHTML code library:
http://www.dynamicdrive.com* Visit Dynamic Drive at
http://www.dynamicdrive.com/ for full source code
***********************************************/
<
/script>
<
script type="
text/javascript">
var myMenu;
window.onload = function() {
myMenu = new SDMenu("my_menu");
myMenu.init();
};
<
/script>
<
/head>
<
body>
<
div class="
head"><
a href="
default.htm"><
img src="
logo-5.jpg" alt="
" width="712" height="
127" border="
0" /><
/a><
/div>
<
div style="
float: left" id="
my_menu" class="
sdmenu">
<
div>
<
span> Меню 1<
/span>
<
a href="
http://tools.dynamicdrive.com/imageoptimizer/">Субменю 11<
/a>
<
a href="
http://tools.dynamicdrive.com/favicon/">Субменю 12<
/a>
<
a href="
http://www.dynamicdrive.com/emailriddler/">Субменю 13<
/a>
<
a href="
http://tools.dynamicdrive.com/password/">Субменю 14<
/a>
<
/div>
<
div>
<
span>Меню 2<
/span>
<
a href="
http://tools.dynamicdrive.com/imageoptimizer/">Субменю 21<
/a>
<
a href="
http://tools.dynamicdrive.com/favicon/">Субменю 22<
/a>
<
a href="
http://www.dynamicdrive.com/emailriddler/">Субменю 23<
/a>
<
a href="
http://tools.dynamicdrive.com/password/">Субменю 24<
/a>
<
a href="
http://tools.dynamicdrive.com/gradient/">Субменю 25<
/a>
<
a href="
http://tools.dynamicdrive.com/button/">Субменю 26<
/a>
<
/div>
<
div>
<
span>Меню 3<
/span>
<
a href="
http://www.dynamicdrive.com/recommendit/">Субменю 31<
/a>
<
a href="
http://www.dynamicdrive.com/link.htm">Субменю 32<
/a>
<
a href="
http://www.dynamicdrive.com/resources/">Субменю 33<
/a>
<
/div>
<
div class="
collapsed">
<
span>Меню 4<
/span>
<
a href="
http://www.javascriptkit.com">Субменю 41<
/a>
<
a href="
http://www.cssdrive.com">Субменю 42<
/a>
<
a href="
http://www.codingforums.com">Субменю 43<
/a>
<
a href="
http://www.dynamicdrive.com/style/">Субменю 44<
/a>
<
/div>
<
div>
<
span>Меню 5<
/span>
<
a href="
?foo=bar">Субменю 51<
/a>
<
a href="
./">Субменю 52<
/a>
<
a href="
index.html">Субменю 53<
/a>
<
a href="
index.html?query">Субменю 54<
/a>
<
/div>
<
/div>
<
div style="
padding-left: 200px">
<
pre>
<
/pre>
<
p><
/p>
<
/div>
<
/body>
<
/html>
Текст скрипта:
unction SDMenu(id) {
if (!document.getElementById || !document.getElementsByTagName)
return false;
this.menu = document.getElementById(id);
this.submenus = this.menu.getElementsByTagName("div");
this.remember = true;
this.speed = 3;
this.markCurrent = true;
this.oneSmOnly = false;
}
SDMenu.prototype.init = function() {
var mainInstance = this;
for (var i = 0; i < this.submenus.length; i++)
this.submenus[i].getElementsByTagName("span")[0].onclick = function() {
mainInstance.toggleMenu(this.parentNode);
};
if (this.markCurrent) {
var links = this.menu.getElementsByTagName("a");
for (var i = 0; i < links.length; i++)
if (links[i].href == document.location.href) {
links[i].className = "current";
break;
}
}
if (this.remember) {
var regex = new RegExp("sdmenu_" + encodeURIComponent(this.menu.id) + "=([01]+)");
var match = regex.exec(document.cookie);
if (match) {
var states = match[1].split("");
for (var i = 0; i < states.length; i++)
this.submenus[i].className = (states[i] == 0 ? "collapsed" : "");
}
}
};
SDMenu.prototype.toggleMenu = function(submenu) {
if (submenu.className == "collapsed")
this.expandMenu(submenu);
else
this.collapseMenu(submenu);
};
SDMenu.prototype.expandMenu = function(submenu) {
var fullHeight = submenu.getElementsByTagName("span")[0].offsetHeight;
var links = submenu.getElementsByTagName("a");
for (var i = 0; i < links.length; i++)
fullHeight += links[i].offsetHeight;
var moveBy = Math.round(this.speed * links.length);
var mainInstance = this;
var intId = setInterval(function() {
var curHeight = submenu.offsetHeight;
var newHeight = curHeight + moveBy;
if (newHeight < fullHeight)
submenu.style.height = newHeight + "px";
else {
clearInterval(intId);
submenu.style.height = "";
submenu.className = "";
mainInstance.memorize();
}
}, 30);
this.collapseOthers(submenu);
};
SDMenu.prototype.collapseMenu = function(submenu) {
var minHeight = submenu.getElementsByTagName("span")[0].offsetHeight;
var moveBy = Math.round(this.speed * submenu.getElementsByTagName("a").length);
var mainInstance = this;
var intId = setInterval(function() {
var curHeight = submenu.offsetHeight;
var newHeight = curHeight - moveBy;
if (newHeight > minHeight)
submenu.style.height = newHeight + "px";
else {
clearInterval(intId);
submenu.style.height = "";
submenu.className = "collapsed";
mainInstance.memorize();
}
}, 30);
};
SDMenu.prototype.collapseOthers = function(submenu) {
if (this.oneSmOnly) {
for (var i = 0; i < this.submenus.length; i++)
if (this.submenus[i] != submenu && this.submenus[i].className != "collapsed")
this.collapseMenu(this.submenus[i]);
}
};
SDMenu.prototype.expandAll = function() {
var oldOneSmOnly = this.oneSmOnly;
this.oneSmOnly = false;
for (var i = 0; i < this.submenus.length; i++)
if (this.submenus[i].className == "collapsed")
this.expandMenu(this.submenus[i]);
this.oneSmOnly = oldOneSmOnly;
};
SDMenu.prototype.collapseAll = function() {
for (var i = 0; i < this.submenus.length; i++)
if (this.submenus[i].className != "collapsed")
this.collapseMenu(this.submenus[i]);
};
SDMenu.prototype.memorize = function() {
if (this.remember) {
var states = new Array();
for (var i = 0; i < this.submenus.length; i++)
states.push(this.submenus[i].className == "collapsed" ? 0 : 1);
var d = new Date();
d.setTime(d.getTime() + (30 * 24 * 60 * 60 * 1000));
document.cookie = "sdmenu_" + encodeURIComponent(this.menu.id) + "=" + states.join("") + "; expires=" + d.toGMTString() + "; path=/";
}
};