问题

I'm currently building a site for myself, and I found this really awesome effect on multiple sites where the navbar is below an image, but when you scroll past it, it sticks to the top.

Example

How can I achieve this? Also, how can I achieve an effect similar to the one on this website with a similar navbar style?

回答1:

Here is what @Matthew was talking about:

Check this fiddle http://jsfiddle.net/luckmattos/yp8HK/1/

JQUERY

var num = 200; //number of pixels before modifying styles

$(window).bind('scroll', function () {
    if ($(window).scrollTop() > num) {
        $('.menu').addClass('fixed');
    } else {
        $('.menu').removeClass('fixed');
    }
});

Hope it helps, I used bootstrap navbar.

回答2:

Here are some few examples

With in bootstrap you can use navbar-fixed-top class.

<nav class="navbar navbar-default navbar-fixed-top" role="navigation">
  <div class="container">
    ...
  </div>
</nav>

Have a look at following links:

Fixed to Top : http://getbootstrap.com/components/#navbar-fixed-top

Fixed Navbar example : http://getbootstrap.com/examples/navbar-fixed-top/

回答3:

Here's a Bootstrap example that attaches the navbar to the top once the user has scrolled past the top header..

http://www.bootply.com/121595

Here is another example that is animates the attaching of the navbar using CSS transition

http://www.bootstrapzero.com/bootstrap-template/the-firm

回答4:

Here is a REAL quick example I threw together with jquery and some very simple css.

$(window).on('scroll', function(){
    if($(window).scrollTop()>=95 && !$('nav').hasClass('fixed')){
        $('nav').addClass('fixed'); 
    }
    else if($(window).scrollTop()<95 && $('nav').hasClass('fixed')){
       $('nav').removeClass('fixed') 
    }
});

CSS

.container {
  height: 1800px;
}

.header {
  text-align: center;
}

nav {
  background-color: #efefef;
  border-top: 2px solid #666;
  border-bottom: 2px solid #666;
  padding: 15px;
  width: 100%;
}
nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
nav li {
  display: inline-block;
}

.fixed {
  position: fixed;
  top: 0;
  left: 0;
}

HTML

<div class="container">
<div class="header">
  <img src="http://www.placehold.it/500x85" alt="" />
<nav role='navigation'>
  <ul>
    <li><a href="#">Home</a></li>
    <li><a href="#">About</a></li>
    <li><a href="#">Clients</a></li>
    <li><a href="#">Contact Us</a></li>
  </ul>
</nav>  
</div>
</div>

回答5:

Here is an example of sticky navigation bar On-Scroll with dynamic height getting

JS

You need to add a jQuery Library file first.

Here is fiddle link- https://jsfiddle.net/CV_pawan/4nr4codq/1/

$(document).ready(function(){
  var num = $(".header-class").offset().top; 
  $(window).bind('scroll', function() { 
    if ($(window).scrollTop() > num) {  
      $('.header-class').addClass('fixed');  
    } 
    else {  
     $('.header-class').removeClass('fixed');    
    } 
  });
});

CSS

body {
  margin: 0px;
  padding: 0px;
}

.nav-bar-white {
  background-color: #125456;
  width: 100%;
}

.active-2 {
  float: right;
  width: 49%;
  text-align: right;
}

.fixed {
  position: fixed;
  width: 100%;
  top: 0;
}

h3 {
  color: #fff;
}

.first {
  background: #000;
  width: 49%;
  display: inline-block;
  margin: 0px;
  padding: 0px;
  border: 1px solid #fff;
}

.first p {
  color: #fff;
}

.second {
  background: #000;
  width: 49%;
  display: inline-block;
  margin: 0px;
  padding: 0px;
  border: 1px solid #fff;
}

.second p {
  color: #fff;
}

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #300E06;
}

li {
  float: left;
}

li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

li a:hover {
  background-color: #000;
}

HTML

<ul class="nav-bar-white">
  <li class="active-1"><a href="#home">Company Logo</a></li>
</ul>

<ul class="header-class">
  <li><a class="active" href="#home">Home</a></li>
  <li><a href="#news">News</a></li>
  <li><a href="#contact">Contact</a></li>
  <li><a href="#about">About</a></li>
</ul>
<div>
  <div class="first">
    <h3>
What is Lorem Ipsum?
</h3>
    <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It
      has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
      publishing software like Aldus PageMaker including versions of Lorem Ipsum
      <p>
        Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has
        survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
        publishing software like Aldus PageMaker including versions of Lorem Ipsum
      </p>
    </p>
  </div>
  <div class="second">
    <h3>
What is Lorem Ipsum?
</h3>
    <p>
      <p>
        Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has
        survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
        publishing software like Aldus PageMaker including versions of Lorem Ipsum
      </p>
      <p>
        Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has
        survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
        publishing software like Aldus PageMaker including versions of Lorem Ipsum
      </p>
    </p>
  </div>
</div>

<div class="first">
  <h3>
What is Lorem Ipsum?
</h3>
  <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It
    has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
    publishing software like Aldus PageMaker including versions of Lorem Ipsum
    <p>
      Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has
      survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
      publishing software like Aldus PageMaker including versions of Lorem Ipsum
    </p>
  </p>
</div>
<div class="second">
  <h3>
What is Lorem Ipsum?
</h3>
  <p>
    <p>
      Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has
      survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
      publishing software like Aldus PageMaker including versions of Lorem Ipsum
    </p>
    <p>
      Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has
      survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
      publishing software like Aldus PageMaker including versions of Lorem Ipsum
    </p>
  </p>
</div>
</div>

来源：https://stackoverflow.com/questions/22541364/sticky-navbar-onscroll

标签

jquery