Você já deve ter visto isso enquanto navegava pela Internet - um menu de navegação que "gruda" no topo do navegador quando voce rola a pagina para baixo.Este efeito popular, garante que você nunca tenha que voltar ao topo de uma página para ver esse menu; o menu estara sempre flutuando por aí, esperando para ser usado.
Neste tutorial, vou mostrar como criar esse efeito.
Primeiramente veja como o efeito funciona (clique Aqui), repare que ao rolar a pagina o menu que ficava no meio do site, rola, ficando fixado no topo da tela.
Para começar, coloque o jquery, o css, e o script dentro das tags <head> de seu site.
Em seguida coloque o codigo HTML dentro das tags <body> de seu site, salve e veja como fica.
jQuery
<!-- Include jQuery -->
<script src='http://code.jquery.com/jquery-1.8.3.js' type='text/javascript'></script>
CSS
<style type='text/css'>
#wrap {margin: 10px auto;background: #666;padding: 10px;width: 700px;}
#header {background-color: #666;color: #FFF;}
#logo {font-size: 30px;line-height: 40px;padding: 5px;}
#navWrap {height: 30px;}
#smoothnav {padding: 5px;background: #999;}
#smoothnav ul {margin: 0;padding: 0;}
#smoothnav li {float: left;padding: 3px 8px;background-color: #FFF;margin: 0 10px 0 0;color: #F00;list-style-type: none;}
#smoothnav li a {color: #F00;text-decoration: none;}
#smoothnav li a:hover {text-decoration: underline;}br.clearLeft {clear: left;}
</style>
Script
<script type='text/javascript'>
//<![CDATA[
$(window).load(function(){
/**
************************************************************
*************** THIS IS THE NAVIGATION CODE ****************
*************** MENU DESLIZANTE ****************
************************************************************
**/
$(function() {
// Stick the #nav to the top of the window
var nav = $('#smoothnav');
var navHomeY = nav.offset().top;
var isFixed = false;
var $w = $(window);
$w.scroll(function() {
var scrollTop = $w.scrollTop();
var shouldBeFixed = scrollTop > navHomeY;
if (shouldBeFixed && !isFixed) {
nav.css({
position: 'fixed',
top: 0,
left: nav.offset().left,
width: nav.width()
});
isFixed = true;
}
else if (!shouldBeFixed && isFixed)
{
nav.css({
position: 'static'
});
isFixed = false;
}
});
});
/**
************************************************************
*** THIS IS THE ADD-IN SMOOTH SCROLLING CODE ***************
*** (see: http://www.dwuser.com/education/content/quick-guide-adding-smooth-scrolling-to-your-webpages/ )
************************************************************
**/
/**
* SmoothScroll
* This helper script created by DWUser.com. Copyright 2012 DWUser.com.
* Dual-licensed under the GPL and MIT licenses.
* All individual scripts remain property of their copyrighters.
* Date: 10-Sep-2012
* Version: 1.0.1
*/
if (!window['jQuery']) alert('The jQuery library must be included before the smoothscroll.js file. The plugin will not work propery.');
/**
* jQuery.ScrollTo - Easy element scrolling using jQuery.
* Copyright (c) 2007-2012 Ariel Flesler - aflesler(at)gmail(dot)com | http://flesler.blogspot.com
* Dual licensed under MIT and GPL.
* @author Ariel Flesler
* @version 1.4.3.1
*/
;(function($){var h=$.scrollTo=function(a,b,c){$(window).scrollTo(a,b,c)};h.defaults={axis:'xy',duration:parseFloat($.fn.jquery)>=1.3?0:1,limit:true};h.window=function(a){return $(window)._scrollable()};$.fn._scrollable=function(){return this.map(function(){var a=this,isWin=!a.nodeName||$.inArray(a.nodeName.toLowerCase(),['iframe','#document','html','body'])!=-1;if(!isWin)return a;var b=(a.contentWindow||a).document||a.ownerDocument||a;return/webkit/i.test(navigator.userAgent)||b.compatMode=='BackCompat'?b.body:b.documentElement})};$.fn.scrollTo=function(e,f,g){if(typeof f=='object'){g=f;f=0}if(typeof g=='function')g={onAfter:g};if(e=='max')e=9e9;g=$.extend({},h.defaults,g);f=f||g.duration;g.queue=g.queue&&g.axis.length>1;if(g.queue)f/=2;g.offset=both(g.offset);g.over=both(g.over);return this._scrollable().each(function(){if(e==null)return;var d=this,$elem=$(d),targ=e,toff,attr={},win=$elem.is('html,body');switch(typeof targ){case'number':case'string':if(/^([+-]=)?\d+(\.\d+)?(px|%)?$/.test(targ)){targ=both(targ);break}targ=$(targ,this);if(!targ.length)return;case'object':if(targ.is||targ.style)toff=(targ=$(targ)).offset()}$.each(g.axis.split(''),function(i,a){var b=a=='x'?'Left':'Top',pos=b.toLowerCase(),key='scroll'+b,old=d[key],max=h.max(d,a);if(toff){attr[key]=toff[pos]+(win?0:old-$elem.offset()[pos]);if(g.margin){attr[key]-=parseInt(targ.css('margin'+b))||0;attr[key]-=parseInt(targ.css('border'+b+'Width'))||0}attr[key]+=g.offset[pos]||0;if(g.over[pos])attr[key]+=targ[a=='x'?'width':'height']()*g.over[pos]}else{var c=targ[pos];attr[key]=c.slice&&c.slice(-1)=='%'?parseFloat(c)/100*max:c}if(g.limit&&/^\d+$/.test(attr[key]))attr[key]=attr[key]<=0?0:Math.min(attr[key],max);if(!i&&g.queue){if(old!=attr[key])animate(g.onAfterFirst);delete attr[key]}});animate(g.onAfter);function animate(a){$elem.animate(attr,f,g.easing,a&&function(){a.call(this,e,g)})}}).end()};h.max=function(a,b){var c=b=='x'?'Width':'Height',scroll='scroll'+c;if(!$(a).is('html,body'))return a[scroll]-$(a)[c.toLowerCase()]();var d='client'+c,html=a.ownerDocument.documentElement,body=a.ownerDocument.body;return Math.max(html[scroll],body[scroll])-Math.min(html[d],body[d])};function both(a){return typeof a=='object'?a:{top:a,left:a}}})(jQuery);
/**
* jQuery.LocalScroll
* Copyright (c) 2007-2010 Ariel Flesler - aflesler(at)gmail(dot)com | http://flesler.blogspot.com
* Dual licensed under MIT and GPL.
* Date: 05/31/2010
* @author Ariel Flesler
* @version 1.2.8b
**/
;(function(b){function g(a,e,d){var h=e.hash.slice(1),f=document.getElementById(h)||document.getElementsByName(h)[0];if(f){a&&a.preventDefault();var c=b(d.target);if(!(d.lock&&c.is(":animated")||d.onBefore&&!1===d.onBefore(a,f,c))){d.stop&&c._scrollable().stop(!0);if(d.hash){var a=f.id==h?"id":"name",g=b("<a> </a>").attr(a,h).css({position:"absolute",top:b(window).scrollTop(),left:b(window).scrollLeft()});f[a]="";b("body").prepend(g);location=e.hash;g.remove();f[a]=h}c.scrollTo(f,d).trigger("notify.serialScroll",
[f])}}}var i=location.href.replace(/#.*/,""),c=b.localScroll=function(a){b("body").localScroll(a)};c.defaults={duration:1E3,axis:"y",event:"click",stop:!0,target:window,reset:!0};c.hash=function(a){if(location.hash){a=b.extend({},c.defaults,a);a.hash=!1;if(a.reset){var e=a.duration;delete a.duration;b(a.target).scrollTo(0,a);a.duration=e}g(0,location,a)}};b.fn.localScroll=function(a){function e(){return!!this.href&&!!this.hash&&this.href.replace(this.hash,"")==i&&(!a.filter||b(this).is(a.filter))}
a=b.extend({},c.defaults,a);return a.lazy?this.bind(a.event,function(d){var c=b([d.target,d.target.parentNode]).filter(e)[0];c&&g(d,c,a)}):this.find("a,area").filter(e).bind(a.event,function(b){g(b,this,a)}).end().end()}})(jQuery);
// Initialize all .smoothScroll links
jQuery(function($){ $.localScroll({filter:'.smoothScroll'}); });
});
//]]>
</script>
Html
<div id="header">
<div id="logo">
Start Slowly Scrolling Down<br /> This Page!</div>
<div id="navWrap">
<div id="smoothnav">
<ul><li>
<a href="#" class="smoothScroll">
Demo Link 1</a>
</li><li>
<a href="#" class="smoothScroll">
Demo Link 2</a>
</li><li>
<a href="#" class="smoothScroll">
Demo Link 3</a></li><li>
<a href="#" class="smoothScroll">Demo Link 4</a>
</li></ul>
<br class="clearLeft" />
</div></div>
</div>
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