javascript 滚动后固定导航栏
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Make navigation bar fixed after scroll
提问by Kadeem L
I'm attempting to make the navigation bar stick to the top, when the user scrolls down to the nav bar and then unstick when the user scrolls back up past the navbar. The JSFIDDLE is here. Any help will be greatly appreciated.
我试图让导航栏粘在顶部，当用户向下滚动到导航栏，然后当用户向上滚动超过导航栏时取消粘滞。该的jsfiddle在这里。任何帮助将不胜感激。
Update: I understand that this can't be implemented through CSS & HTML. What would be the best way to implement this?
更新：我知道这不能通过 CSS 和 HTML 实现。实现这一点的最佳方法是什么？
<section class="main">
<div id="wrap">
<div id="featured">
<div class="wrap">
<div class="textwidget">
<div class="cup"><img src="#""></div>
<div id="header"></div></div></div></div></div></div></div>
<div class="whiteboard">
<h1><a href="#">HELLO GUYS</a></h1>
</div>
</div>
<div class="bg1"> <h2> WE ARE AN EVENTS MANAGEMENT COMPANY BASED IN LONDON. </h2></div>
& the CSS
和 CSS
.main{text-align:center;}
h1{
-webkit-font-smoothing: antialiased;
display:inline-block;
font: 800 1.313em "proxima-nova",sans-serif;
padding: 10px 10px;
margin: 20px 20px;
letter-spacing: 8px;
text-transform: uppercase;
font-size:3.125em;
text-align: center;
max-width: 606px;
line-height: 1.45em;
position: scroll;
background-color:#e94f78;
text-decoration: none;
color:yellow;
background-image:url;
}
h1 a{
text-decoration: none;
color:yellow;
padding-left: 0.15em;
}
h2{
-webkit-font-smoothing: antialiased;
display:inline-block;
font: 800 1.313em "proxima-nova",sans-serif;
letter-spacing: 8px;
margin-top: 100px;
text-transform: uppercase;
font-size:3.125em;
text-align: center;
line-height: 1.45em;
position: scroll;
text-decoration: none;
color:white;
z-index: -9999;
}
h2 a{
text-decoration: none;
color:white;
padding-left: 0.15em;
}
h5{
position: absolute;
font-family:sans-serif;
font-weight:bold;
font-size:40px;
text-align: center;
float: right;
background-color:#fff;
margin-top: -80px;
margin-left: 280px;
}
h5 a{
text-decoration: none;
color:red;
}
h5 a:hover{
color:yellow;
}
#text1{
-webkit-font-smoothing: antialiased;
display:inline-block;
font: 800 1.313em "proxima-nova",sans-serif;
margin: 20px 20px;
letter-spacing: 8px;
text-transform: uppercase;
font-size:3.125em;
text-align: center;
max-width: 606px;
line-height: 1.45em;
position: scroll;
background-color:#E94F78;
}
#text1 a{
color:yellow;
text-decoration: none;
padding-left: 0.15em;
}
#text1 a:hover{
text-decoration: none;
cursor:pointer;
}
.whiteboard{
background-image:url(http://krystalrae.com/img/krystalrae-2012-fall-print-leopard-sketch.jpg);
background-position: center;
padding: ;
background-color: #fff;
z-index: 1000;
}
.bg{
height:2000px;
background-color:#ff0;
background-image:url(http://alwayscreative.net/images/stars-last.jpg);
position:relative;
z-index: -9999;
}
.bg1{
background-image:url(http://alwayscreative.net/images/stars-last.jpg);
z-index: -9999;
height:1000px;
}
/* Header */
#wrap {
margin: 0 auto;
padding: 0;
width: 100%;
}
#featured {
background: #E94F78 url(http://www.creativityfluid.com/wp-content/themes/creativityfluid/images/img-bubbles-red.png) no-repeat top;
background-size: 385px 465px;
color: #fff;
height: 535px;
overflow: hidden;
position: relative;
z-index: -2;
}
#featured .wrap {
overflow: hidden;
clear: both;
padding: 70px 0 30px;
position: fixed;
z-index: -1;
width: 100%;
}
#featured .wrap .widget {
width: 80%;
max-width: 1040px;
margin: 0 auto;
}
#featured h1,
#featured h3,
#featured p {
color: yellow;
text-shadow: none;
}
#featured h4{
color:white;
text-shadow:none;
}
#featured h4 {
margin: 0 0 30px;
}
#featured h3 {
font-family: 'proxima-nova-sc-osf', arial, serif;
font-weight: 600;
letter-spacing: 3px;
}
#featured h1 {
margin: 0;
}
.textwidget{
padding: 0;
}
.cup{
margin-top:210px;
z-index: 999999;
}
.container{font-size:14px; margin:0 auto; width:960px}
.test_content{margin:10px 0;}
.scroller_anchor{height:0px; margin:0; padding:0;background-image:url()}
.scroller{background:#FFF;
background-image:url(http://krystalrae.com/img/krystalrae-2012-fall-print-leopard-sketch.jpg);
margin:0 0 10px; z-index:100; height:50px; font-size:18px; font-weight:bold; text-align:center; width:960px;}
回答by Amann Malik
This "sticky" behavior you are referring to has become popular enough over the web that some people suggested it should be implemented as a CSS property like 'position: sticky' however right now and for the foreseeable future it is impossible to make a "sticky element" without the use of Javascript.
您所指的这种“粘性”行为已经在网络上变得足够流行，以至于有些人建议将其实现为像“位置：粘性”这样的 CSS 属性，但是现在和在可预见的未来，不可能制作“粘性”元素”而不使用 Javascript。
var element = document.getElementById('navBar')
window.addEventListener('scroll', function() {
element.getBoundingClientRect().top < 0 ?
element.classList.add('stuck') :
element.classList.remove('stuck');
});
where in CSS .stuck {position: fixed;}
在 CSS 中的位置 .stuck {position: fixed;}
... something like that
……类似的东西
回答by Nileshd
You can do it something like this :
你可以这样做：
HTML:
HTML：
<div id="image">Some image</div>
<div id="scroller">Some controls</div>
CSS:
CSS：
body {
height: 3000px;
top: 0;
}
#image {
width: 100%;
background: #444;
height: 50px;
}
#scroller{
height:100px;
background:#ccc;
}
.stuck{
position:fixed;
z-index:100;
width:100%;
top:0;
}
JavaScript:
JavaScript：
$(window).scroll(function() {
if ($(window).scrollTop() > 50) {
$('#scroller').addClass('stuck');
} else {
$('#scroller').removeClass('stuck');
}
});
after scroll 50 px it will change the css of scroller.
滚动 50 像素后，它将更改滚动条的 css。
this may be a good start
这可能是一个好的开始
