Для меня в нём несомненный плюс - отсутствие лишней статики. Не люблю загромождать страницу.
Как всегда демо, но в виде пикчи (привожу на тот случай, если всё-таки сменю это меню на другое):
Описание: маленький тёмный квадрат расширяется до серого, тем самым выделяя будущий активный пункт меню. Где-то в инете видел, что за этот скрипт копипастер просит 35 зелёных лавешков.
А теперь разберём его на составляющие.
Первое - скрипт меню:
<script>По идее, он должен быть в отдельном файле и прописываться в /head, но там и так дофига всего с потусторонних хостингов (надо бы всё на один положить).
// t: current time, b: begInnIng value, c: change In value, d: duration
jQuery.easing['jswing'] = jQuery.easing['swing'];
jQuery.extend( jQuery.easing,
{
def: 'easeOutQuad',
swing: function (x, t, b, c, d) {
//alert(jQuery.easing.default);
return jQuery.easing[jQuery.easing.def](x, t, b, c, d);
},
easeInQuad: function (x, t, b, c, d) {
return c*(t/=d)*t + b;
},
easeOutQuad: function (x, t, b, c, d) {
return -c *(t/=d)*(t-2) + b;
},
easeInOutQuad: function (x, t, b, c, d) {
if ((t/=d/2) < 1) return c/2*t*t + b;
return -c/2 * ((--t)*(t-2) - 1) + b;
},
easeInCubic: function (x, t, b, c, d) {
return c*(t/=d)*t*t + b;
},
easeOutCubic: function (x, t, b, c, d) {
return c*((t=t/d-1)*t*t + 1) + b;
},
easeInOutCubic: function (x, t, b, c, d) {
if ((t/=d/2) < 1) return c/2*t*t*t + b;
return c/2*((t-=2)*t*t + 2) + b;
},
easeInQuart: function (x, t, b, c, d) {
return c*(t/=d)*t*t*t + b;
},
easeOutQuart: function (x, t, b, c, d) {
return -c * ((t=t/d-1)*t*t*t - 1) + b;
},
easeInOutQuart: function (x, t, b, c, d) {
if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
return -c/2 * ((t-=2)*t*t*t - 2) + b;
},
easeInQuint: function (x, t, b, c, d) {
return c*(t/=d)*t*t*t*t + b;
},
easeOutQuint: function (x, t, b, c, d) {
return c*((t=t/d-1)*t*t*t*t + 1) + b;
},
easeInOutQuint: function (x, t, b, c, d) {
if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
return c/2*((t-=2)*t*t*t*t + 2) + b;
},
easeInSine: function (x, t, b, c, d) {
return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
},
easeOutSine: function (x, t, b, c, d) {
return c * Math.sin(t/d * (Math.PI/2)) + b;
},
easeInOutSine: function (x, t, b, c, d) {
return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
},
easeInExpo: function (x, t, b, c, d) {
return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
},
easeOutExpo: function (x, t, b, c, d) {
return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
},
easeInOutExpo: function (x, t, b, c, d) {
if (t==0) return b;
if (t==d) return b+c;
if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b;
return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;
},
easeInCirc: function (x, t, b, c, d) {
return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
},
easeOutCirc: function (x, t, b, c, d) {
return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
},
easeInOutCirc: function (x, t, b, c, d) {
if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b;
return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;
},
easeInElastic: function (x, t, b, c, d) {
var s=1.70158;var p=0;var a=c;
if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.3;
if (a < Math.abs(c)) { a=c; var s=p/4; }
else var s = p/(2*Math.PI) * Math.asin (c/a);
return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
},
easeOutElastic: function (x, t, b, c, d) {
var s=1.70158;var p=0;var a=c;
if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.3;
if (a < Math.abs(c)) { a=c; var s=p/4; }
else var s = p/(2*Math.PI) * Math.asin (c/a);
return a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b;
},
easeInOutElastic: function (x, t, b, c, d) {
var s=1.70158;var p=0;var a=c;
if (t==0) return b; if ((t/=d/2)==2) return b+c; if (!p) p=d*(.3*1.5);
if (a < Math.abs(c)) { a=c; var s=p/4; }
else var s = p/(2*Math.PI) * Math.asin (c/a);
if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b;
},
easeInBack: function (x, t, b, c, d, s) {
if (s == undefined) s = 1.70158;
return c*(t/=d)*t*((s+1)*t - s) + b;
},
easeOutBack: function (x, t, b, c, d, s) {
if (s == undefined) s = 1.70158;
return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
},
easeInOutBack: function (x, t, b, c, d, s) {
if (s == undefined) s = 1.70158;
if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
},
easeInBounce: function (x, t, b, c, d) {
return c - jQuery.easing.easeOutBounce (x, d-t, 0, c, d) + b;
},
easeOutBounce: function (x, t, b, c, d) {
if ((t/=d) < (1/2.75)) {
return c*(7.5625*t*t) + b;
} else if (t < (2/2.75)) {
return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
} else if (t < (2.5/2.75)) {
return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
} else {
return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
}
},
easeInOutBounce: function (x, t, b, c, d) {
if (t < d/2) return jQuery.easing.easeInBounce (x, t*2, 0, c, d) * .5 + b;
return jQuery.easing.easeOutBounce (x, t*2-d, 0, c, d) * .5 + c*.5 + b;
}
});
</script>
Второе - jQuery скрипт настройки. Внимательно чтим комменты, если руки чешуться покрутить.
<script type="text/javascript">
$(document).ready(function () {
//transitions
//for more transition, goto http://gsgd.co.uk/sandbox/jquery/easing/
var style = 'easeOutElastic';
//Retrieve the selected item position and width
var default_left = Math.round($('#lava li.selected').offset().left - $('#lava').offset().left);
var default_width = $('#lava li.selected').width();
//Set the floating bar position and width
$('#box').css({left: default_left});
$('#box .head').css({width: default_width});
//if mouseover the menu item
$('#lava li').hover(function () {
//Get the position and width of the menu item
left = Math.round($(this).offset().left - $('#lava').offset().left);
width = $(this).width();
//Set the floating bar position, width and transition
$('#box').stop(false, true).animate({left: left},{duration:1000, easing: style});
$('#box .head').stop(false, true).animate({width:width},{duration:1000, easing: style});
//if user click on the menu
}).click(function () {
//reset the selected item
$('#lava li').removeClass('selected');
//select the current item
$(this).addClass('selected');
});
//If the mouse leave the menu, reset the floating bar to the selected item
$('#lava').mouseleave(function () {
//Retrieve the selected item position and width
default_left = Math.round($('#lava li.selected').offset().left - $('#lava').offset().left);
default_width = $('#lava li.selected').width();
//Set the floating bar position, width and transition
$('#box').stop(false, true).animate({left: default_left},{duration:1500, easing: style});
$('#box .head').stop(false, true).animate({width:default_width},{duration:1500, easing: style});
});
});
</script>
Третье - таблицо стилей. Оно тоже должно быть "где-то там", но по той же причине здесь :).
<style type="text/css">
body {
font-family:georgia;
font-size:14px;
}
a {
text-decoration:none;
color:#333;
}
#lava {
/* you must set it to relative, so that you can use absolute position for children elements */
position:relative;
text-align:center;
width:683px;
height:40px;
}
#lava ul {
/* remove the list style and spaces*/
margin:0;
padding:0;
list-style:none;
display:inline;
/* position absolute so that z-index can be defined */
position:absolute;
/* center the menu, depend on the width of you menu*/
left:110px;
top:0;
/* should be higher than #box */
z-index:100;
}
#lava ul li {
/* give some spaces between the list items */
margin:0 15px;
/* display the list item in single row */
float:left;
}
#lava #box {
/* position absolute so that z-index can be defined and able to move this item using javascript */
position:absolute;
left:0;
top:0;
/* should be lower than the list menu */
z-index:50;
/* image of the right rounded corner */
background:#ccc;
height:20px;
/* add padding 8px so that the tail would appear */
padding-right:8px;
/* self-adjust negative margin to make sure the box display in the center of the item */
margin-left:-10px;
}
#lava #box .head {
/* image of the left rounded corner */
background:#eee;
height:20px;
/* self-adjust left padding to make sure the box display in the center of the item */
padding-left:10px;
}
</style>
Четвёртое - код контейнера с селектором для вставки в блог:
<div id="lava">
<ul>
<li class="selected"><li><a href="http://blogger.omg-linux.ru/">Домой</a></li>
<li><a href="http://blogger.omg-linux.ru/p/html_15.html">Html-цвета</a></li>
<li><a href="http://blogger.omg-linux.ru/p/blog-page_15.html">Начинающим</a></li>
<li><a href="http://blogger.omg-linux.ru/p/blog-page.html">Как делать ссылки</a></li>
</li></ul>
<!-- If you want to make it even simpler, you can append these html using jquery -->
<div id="box"><div class="head"></div></div>
</div>
Ну а теперь всё кучно (можно сразу пихать в html гаджет/виджет) блоггера:
<script>Конечно, сразу пихать не надо, сначала надо исправить все мои ссылки.
// t: current time, b: begInnIng value, c: change In value, d: duration
jQuery.easing['jswing'] = jQuery.easing['swing'];
jQuery.extend( jQuery.easing,
{
def: 'easeOutQuad',
swing: function (x, t, b, c, d) {
//alert(jQuery.easing.default);
return jQuery.easing[jQuery.easing.def](x, t, b, c, d);
},
easeInQuad: function (x, t, b, c, d) {
return c*(t/=d)*t + b;
},
easeOutQuad: function (x, t, b, c, d) {
return -c *(t/=d)*(t-2) + b;
},
easeInOutQuad: function (x, t, b, c, d) {
if ((t/=d/2) < 1) return c/2*t*t + b;
return -c/2 * ((--t)*(t-2) - 1) + b;
},
easeInCubic: function (x, t, b, c, d) {
return c*(t/=d)*t*t + b;
},
easeOutCubic: function (x, t, b, c, d) {
return c*((t=t/d-1)*t*t + 1) + b;
},
easeInOutCubic: function (x, t, b, c, d) {
if ((t/=d/2) < 1) return c/2*t*t*t + b;
return c/2*((t-=2)*t*t + 2) + b;
},
easeInQuart: function (x, t, b, c, d) {
return c*(t/=d)*t*t*t + b;
},
easeOutQuart: function (x, t, b, c, d) {
return -c * ((t=t/d-1)*t*t*t - 1) + b;
},
easeInOutQuart: function (x, t, b, c, d) {
if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
return -c/2 * ((t-=2)*t*t*t - 2) + b;
},
easeInQuint: function (x, t, b, c, d) {
return c*(t/=d)*t*t*t*t + b;
},
easeOutQuint: function (x, t, b, c, d) {
return c*((t=t/d-1)*t*t*t*t + 1) + b;
},
easeInOutQuint: function (x, t, b, c, d) {
if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
return c/2*((t-=2)*t*t*t*t + 2) + b;
},
easeInSine: function (x, t, b, c, d) {
return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
},
easeOutSine: function (x, t, b, c, d) {
return c * Math.sin(t/d * (Math.PI/2)) + b;
},
easeInOutSine: function (x, t, b, c, d) {
return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
},
easeInExpo: function (x, t, b, c, d) {
return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
},
easeOutExpo: function (x, t, b, c, d) {
return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
},
easeInOutExpo: function (x, t, b, c, d) {
if (t==0) return b;
if (t==d) return b+c;
if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b;
return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;
},
easeInCirc: function (x, t, b, c, d) {
return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
},
easeOutCirc: function (x, t, b, c, d) {
return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
},
easeInOutCirc: function (x, t, b, c, d) {
if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b;
return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;
},
easeInElastic: function (x, t, b, c, d) {
var s=1.70158;var p=0;var a=c;
if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.3;
if (a < Math.abs(c)) { a=c; var s=p/4; }
else var s = p/(2*Math.PI) * Math.asin (c/a);
return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
},
easeOutElastic: function (x, t, b, c, d) {
var s=1.70158;var p=0;var a=c;
if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.3;
if (a < Math.abs(c)) { a=c; var s=p/4; }
else var s = p/(2*Math.PI) * Math.asin (c/a);
return a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b;
},
easeInOutElastic: function (x, t, b, c, d) {
var s=1.70158;var p=0;var a=c;
if (t==0) return b; if ((t/=d/2)==2) return b+c; if (!p) p=d*(.3*1.5);
if (a < Math.abs(c)) { a=c; var s=p/4; }
else var s = p/(2*Math.PI) * Math.asin (c/a);
if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b;
},
easeInBack: function (x, t, b, c, d, s) {
if (s == undefined) s = 1.70158;
return c*(t/=d)*t*((s+1)*t - s) + b;
},
easeOutBack: function (x, t, b, c, d, s) {
if (s == undefined) s = 1.70158;
return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
},
easeInOutBack: function (x, t, b, c, d, s) {
if (s == undefined) s = 1.70158;
if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
},
easeInBounce: function (x, t, b, c, d) {
return c - jQuery.easing.easeOutBounce (x, d-t, 0, c, d) + b;
},
easeOutBounce: function (x, t, b, c, d) {
if ((t/=d) < (1/2.75)) {
return c*(7.5625*t*t) + b;
} else if (t < (2/2.75)) {
return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
} else if (t < (2.5/2.75)) {
return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
} else {
return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
}
},
easeInOutBounce: function (x, t, b, c, d) {
if (t < d/2) return jQuery.easing.easeInBounce (x, t*2, 0, c, d) * .5 + b;
return jQuery.easing.easeOutBounce (x, t*2-d, 0, c, d) * .5 + c*.5 + b;
}
});
</script>
<script type="text/javascript">
$(document).ready(function () {
//transitions
//for more transition, goto http://gsgd.co.uk/sandbox/jquery/easing/
var style = 'easeOutElastic';
//Retrieve the selected item position and width
var default_left = Math.round($('#lava li.selected').offset().left - $('#lava').offset().left);
var default_width = $('#lava li.selected').width();
//Set the floating bar position and width
$('#box').css({left: default_left});
$('#box .head').css({width: default_width});
//if mouseover the menu item
$('#lava li').hover(function () {
//Get the position and width of the menu item
left = Math.round($(this).offset().left - $('#lava').offset().left);
width = $(this).width();
//Set the floating bar position, width and transition
$('#box').stop(false, true).animate({left: left},{duration:1000, easing: style});
$('#box .head').stop(false, true).animate({width:width},{duration:1000, easing: style});
//if user click on the menu
}).click(function () {
//reset the selected item
$('#lava li').removeClass('selected');
//select the current item
$(this).addClass('selected');
});
//If the mouse leave the menu, reset the floating bar to the selected item
$('#lava').mouseleave(function () {
//Retrieve the selected item position and width
default_left = Math.round($('#lava li.selected').offset().left - $('#lava').offset().left);
default_width = $('#lava li.selected').width();
//Set the floating bar position, width and transition
$('#box').stop(false, true).animate({left: default_left},{duration:1500, easing: style});
$('#box .head').stop(false, true).animate({width:default_width},{duration:1500, easing: style});
});
});
</script>
<style type="text/css">
body {
font-family:georgia;
font-size:14px;
}
a {
text-decoration:none;
color:#333;
}
#lava {
/* you must set it to relative, so that you can use absolute position for children elements */
position:relative;
text-align:center;
width:683px;
height:40px;
}
#lava ul {
/* remove the list style and spaces*/
margin:0;
padding:0;
list-style:none;
display:inline;
/* position absolute so that z-index can be defined */
position:absolute;
/* center the menu, depend on the width of you menu*/
left:110px;
top:0;
/* should be higher than #box */
z-index:100;
}
#lava ul li {
/* give some spaces between the list items */
margin:0 15px;
/* display the list item in single row */
float:left;
}
#lava #box {
/* position absolute so that z-index can be defined and able to move this item using javascript */
position:absolute;
left:0;
top:0;
/* should be lower than the list menu */
z-index:50;
/* image of the right rounded corner */
background:#ccc;
height:20px;
/* add padding 8px so that the tail would appear */
padding-right:8px;
/* self-adjust negative margin to make sure the box display in the center of the item */
margin-left:-10px;
}
#lava #box .head {
/* image of the left rounded corner */
background:#eee;
height:20px;
/* self-adjust left padding to make sure the box display in the center of the item */
padding-left:10px;
}
</style>
<div id="lava">
<ul>
<li class="selected"><li><a href="http://blogger.omg-linux.ru/">Домой</a></li>
<li><a href="http://blogger.omg-linux.ru/p/html_15.html">Html-цвета</a></li>
<li><a href="http://blogger.omg-linux.ru/p/blog-page_15.html">Начинающим</a></li>
<li><a href="http://blogger.omg-linux.ru/p/blog-page.html">Как делать ссылки</a></li>
</li></ul>
<!-- If you want to make it even simpler, you can append these html using jquery -->
<div id="box"><div class="head"></div></div>
</div>
Ах, да, первоисточник - тут.
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