如何建立浮动菜单栏时，向下滚动

当我向下滚动站点时，顶部显示黑色菜单栏，看起来像浮动栏。但我认为这涉及到jquery。我尝试过CSS，但似乎不适合我，就像我想要的方式

#menucontainer {
    position:fixed;
    top:0;
    height: 250px
}
#firstElement {
    margin-top: 250px
}

这是网站的基本思路，我希望菜单是这样的:

http://avathemes.com/WP/Hexic/

在div或section中使用ID或class进行换行。

#yourID.fixed {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1;
    width: 100%;
    border-bottom: 5px solid #ffffff;
}
//STICKY NAV
$(document).ready(function () {  
  var top = $('#yourID').offset().top - parseFloat($('#yourID').css('marginTop').replace(/auto/, 100));
  $(window).scroll(function (event) {
    // what the y position of the scroll is
    var y = $(this).scrollTop();
    // whether that's below the form
    if (y >= top) {
      // if so, ad the fixed class
      $('#yourID').addClass('fixed');
    } else {
      // otherwise remove it
      $('#yourID').removeClass('fixed');
    }
  });
});

我不记得我从哪里得到这个，所以没有向我致敬，但它对我有用

试试这个

CSS

* {margin: 0; padding: 0; outline: 0;}

body {
    font-family: Helvetica, Arial, Verdana, sans-serif;
    color: #999;
    font-size: 12px;
    background:#bfbfbf;

}

h1, h2 {
    font-family: 'Open Sans', sans-serif;
    font-weight: 300;
    margin:0 0 15px 0;
}

h1 {
    font-size: 36px;
    letter-spacing: -2px;
    line-height: 100%;
}
h1.title {
    font-size: 46px;
    font-weight: 700;
    color: #6a6a6a;

}

h2 {
    font-size: 24px;
}
p {
    margin: 0 0 15px 0;
}
.menuBtn {
    background: center center no-repeat transparent;
    background: #000;
    display: block;
    width: 40px;
    height: 40px;
    position: absolute;
    top: 0;
    left: 10px;
}
.clear {
    clear: both;
}
.wrap {
        /*background:url(../images/bg.png) top left repeat-x;*/
        width: 100%;
        max-width: 1140px;
        min-width: 960px;
        z-index: 10;
        position: relative;
        margin: 0 auto;
        padding: 0;
}

.section {
    width: 100%;
    max-width: 1140px;
    min-width: 960px;
    z-index: 10;
    position: relative;
    margin: 0 auto;
    padding: 0 0 20px 0;
}

.inner {
    width: 960px;
    margin: 0 auto;
    position: relative;
    min-height: 50px;
    padding:30px 0;
    font-size: 18px;
    font-family: 'Open Sans', sans-serif;
    font-weight: 300;
    padding:30px 0;
}

/* This is the selector i used for my menu, it needs to be set as position:absolute; */
.subMenu {
    position: absolute;
    top: 462px;
    height: 50px;
    z-index: 1000;
    width: 100%;
    max-width: 1140px;
    min-width: 960px;
    background: #aabd46;
}
.subMenu .inner {
    padding:0;
    font-weight: 400;
}


.subNavBtn {
    display: block;
    height: 35px;
    width: 12%;
    float: left;
    margin: 0px 0px 0 0;
    text-decoration: none;
    font-size: 14px;
    padding: 15px 2% 0 2%;
    text-align: center;
    color: #fff;
}
.end {
    margin: 0;
}

/* SECTIONS */
.sTop {
    min-height: 630px;
    background:#e5e5e5;
    color:#3d3d3d;
}

.s1 {
    min-height: 500px;
    background: #2e2e2e;
}

.s2 {
    min-height: 500px;
    background: #3f3f3f;
}

.s3 {
    min-height: 500px;
    background: #504f4f;
}

.s4 {
    min-height: 500px;
    background: #6e87a1;
    color: white;
}
.s5 {
    min-height: 500px;
    background: #293b4d;
    color: white;
}

JavaScript

  (function(){

        $.fn.smint = function( options ) {
            // adding a class to users div
            $(this).addClass('smint')
            var settings = $.extend({
                'scrollSpeed '  : 500
                }, options);

            return $('.smint a').each( function() {

                if ( settings.scrollSpeed ) {
                    var scrollSpeed = settings.scrollSpeed
                }

                ///////////////////////////////////
                // get initial top offset for the menu 
                var stickyTop = $('.smint').offset().top;   
                // check position and make sticky if needed
                var stickyMenu = function(){
                    // current distance top
                    var scrollTop = $(window).scrollTop(); 
                    // if we scroll more than the navigation, change its position to fixed and add class 'fxd', otherwise change it back to absolute and remove the class
                    if (scrollTop > stickyTop) { 
                        $('.smint').css({ 'position': 'fixed', 'top':0 }).addClass('fxd');
                        } else {
                            $('.smint').css({ 'position': 'absolute', 'top':stickyTop }).removeClass('fxd'); 
                        }   
                };
                // run function
                stickyMenu();
                // run function every time you scroll
                $(window).scroll(function() {
                     stickyMenu();
                });
                ///////////////////////////////////////

                $(this).on('click', function(e){

                    // gets the height of the users div. This is used for off-setting the scroll so th emenu doesnt overlap any content in the div they jst scrolled to
                    var selectorHeight = $('.smint').height();   
                    // stops empty hrefs making the page jump when clicked
                    e.preventDefault();
                    // get id pf the button you just clicked
                    var id = $(this).attr('id');
                    // gets the distance from top of the div class that matches your button id minus the height of the nav menu. This means the nav wont initially overlap the content.
                    var goTo =  $('div.'+ id).offset().top -selectorHeight;
                    // Scroll the page to the desired position!
                    $("html, body").animate({ scrollTop: goTo }, scrollSpeed);
                }); 

            });
        }
    })();

HTML

<!DOCTYPE html>
<html>
<head>
<title>SMINT Demo</title>
<meta name = "keywords" content = "" />
<meta name = "description" content = "" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1, minimum-scale=1 user-scalable=no">
<link href='http://fonts.googleapis.com/css?family=Open+Sans:300,400,700' rel='stylesheet' type='text/css'>
<link href="css/demo.css" rel="stylesheet" type="text/css">
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script type="text/javascript"  src="js/jquery.smint.js"></script>
<script type="text/javascript">
$(document).ready( function() {
    $('.subMenu').smint({
        'scrollSpeed' : 1000
    });
});
</script>
</head>
<body>
    <div class="wrap">
      <div class="subMenu" >
        <div class="inner">
            <a href="#" id="sTop" class="subNavBtn">Home</a> 
            <a href="#" id="s1" class="subNavBtn">About me </a>
            <a href="#" id="s2" class="subNavBtn"> Portfolio</a>
            <a href="#" id="s3" class="subNavBtn">Working</a>
            <a href="#" id="s4" class="subNavBtn">Hello</a>
            <a href="#" id="s5" class="subNavBtn end">lets go</a>
        </div>

    </div>

    <div class="section sTop">

        <div class="inner">
            <h1>Welcome to my site </h1>
            <p>Click the links below !</p>
        </div>
        <br class="clear">
    </div>


    <div class="section s1">
        <div class="inner">
            <h1>About me </h1>
        </div>
    </div>
    <div class="section s2">
        <div class="inner">
            <h1>Portfolio</h1>
        </div>
    </div>
    <div class="section s3">
        <div class="inner">
        <h1>Working Standards</h1>
        </div>
    </div>
    <div class="section s4">
        <div class="inner">
            <h1>Hello</h1>
        </div>
    </div>
    <div class="section s5">
        <div class="inner">
        <h1>Lets Go</h1>
        </div>
    </div>

</div>
</body>
</html>

我认为使用Twitter Bootstrap可以帮助你。

查看导航栏，搜索"Fixed to top"

编辑:如果你想要像你的帖子，结合这样的东西让菜单栏固定在顶部时滚动。

当菜单的顶部偏移量等于某个值时，添加类"。navbar-fixed-top"

我尝试了很多次@Kortschot提供的解决方案，但最终证明这个解决方案并不适合我的情况。

这是我的问题，当使用解决方案@Kortschot提供:

浮动条的宽度不能维持当浮动条的状态在固定或不固定之间变化
我想所有的过程可以在一个脚本中完成，而解决方案@Kortschot提供的不适合。

这是我的解决方案，可以做所有的工作在一个脚本(使用1.7+ jquery):

<script>
//浮动条设置(set the floating bar)
$( function(){
    //add new .fixed style to the <head>
    var css = '#floating_bar.fixed{position:fixed;top:1px;z-index:9999;}',
        head = document.head || document.getElementsByTagName('head')[0],
        style = document.createElement('style');
    style.type = 'text/css';
    if (style.styleSheet){ style.styleSheet.cssText = css; } 
    else { style.appendChild(document.createTextNode(css)); }
    head.appendChild(style);
    var menuOffset = $("#floating_bar")[0].offsetTop;
    var menuWidth = document.getElementById("floating_bar").offsetWidth;
    $(document).on("scroll", function(){
        var docScroll = $(document).scrollTop();
        if(docScroll >= menuOffset) { 
            $("#floating_bar").addClass("fixed");
            //dynamically change the width of floating bar according to it's width of previous state 
            $("#floating_bar.fixed").width(menuWidth);
        }else {
            $("#floating_bar").removeClass("fixed");
        }
    });
});
</script>

在您提供的URL中，当您向下滚动页面的几行时，我看到浏览器顶部固定有一个菜单栏。

所以我把你的问题分为两个问题:首先，如何做一个固定的顶部菜单，不会消失时滚动页面。第二，如何在向下滚动几行后使菜单固定在顶部。

对于第一个问题，我修改了你的css代码。

#menucontainer {
    float:top;
    position:fixed;
    top:0;
    height: 100px;
    width: 100%;
    background-color: eeee00; /* makes other content won't be seen when the page scrolling */
}

我认为第二个问题需要写js。我还不知道

HTML

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