Question

我在Scroll上制作了一个简单的视差图像和Sticky标题，带有Html Css＆amp; Js和一切正常，除了主div ，它包含一个h1标签（你可以在下面的代码中看到），它在导航菜单下进行了拼接！

这是我的代码： 您应该使用随机图像来获得更好的结果来测试代码。

HTML：

    <!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8"></meta>
        <title>Daygostar Homepage</title>
        <link rel="stylesheet" type="text/css" href="css/styles.css"/>
    </head>
    <body>
        <div id="wrapper">
            <div id="header">
                <img src="images/bg.png" id="bg" alt="Background Image"/>
            </div>
            <div id="content">
                <div id="navbar">
                    <div id="logo">
                        Daygostar
                    </div>
                    <ul>
                        <li><a href="#">Home</a></li>
                        <li><a href="#">Services</a></li>
                        <li><a href="#">Blogs</a></li>
                        <li><a href="#">About</a></li>
                        <li><a href="#">Contact</a></li>
                    </ul>
                </div>
            </div>
            <div id="main">
                <h1>Daygostar Web Design</h1>
            </div>
        </div>
        <script type="text/javascript" src="js/script.js"></script>
    </body>
</html>

CSS：

    *{padding:0;margin:0;font-family:arial;}
#header{
    height:91vh;
}
#header > img{
    width:100%;
    height:91vh;
    position:fixed;
    z-index:1;
}
#content{
    height:100vh;
    z-index:10;
    background-color:#fff;
    position:relative;
}
#content > #navbar{
    position:absolute;
    top:0;
    width:100%;
    height:80px;
    background-color:#000;
}
#main{
    height:100vh;
    border:solid blue;
    background-color:#fff;
    position:relative;
    padding-top:200px;
    text-align:center;
    font-size:25px;
    z-index:10;
}
#main > *{
    margin-top:30px;
}
#logo{
    color:#fff;
    font-size:35px;
    float:left;
    margin-top:15px;
    margin-left:20px;
    cursor:pointer;
}
#navbar > ul{
    float:right;
    width:700px;
    list-style:none;
    margin-top:25px;
}
#navbar > ul > li{
    display:inline;
}
#navbar ul > li > a{
    color:#fff;
    font-size:20px;
    text-decoration:none;
    padding:10px 30px;
}
#navbar ul > li > a:hover{
    text-decoration:underline;
}

使用Javascript：

    var header = document.getElementById("header");
var navBar = document.getElementById("navbar");
var bg = document.getElementById("bg");
var navbarHeight = navBar.offsetHeight;
var headerHeight = header.offsetHeight;

header.style.height = screen.height-navbarHeight;

function initParallex(){
    if (window.pageYOffset > headerHeight){
        navBar.style.position = "fixed";
        navBar.style.top = "0";
    }else{
        navBar.style.position = "absolute";
        navBar.style.top = "0";
    }
    bg.style.top = -(window.pageYOffset/5)+"px";
}

window.addEventListener("scroll", initParallex);

正如你所看到的，我已经添加了一个if / else语句来检查 headerHeight 是否小于 window.pageYOffset script.js 文件但是一旦网页到达主div，折叠导航就会隐藏！

如果你知道如何解决这个问题，那就太棒了......

Answer 1

你可以看一下：

http://codepen.io/craigiswayne/pen/MyQVQB/

声明：

我确实使用过这个网站上的代码并添加了jQuery。

<强> HTML：

<div id="wrapper">
  <div id="header">
    <img src="http://orig13.deviantart.net/a8a7/f/2009/302/6/4/m_o_d_tile_background_by_viper_mod.png" id="bg" alt="Background Image" />
  </div>
  <div id="content">
    <div id="navbar">
      <div id="logo">
        Daygostar
      </div>
      <ul>
        <li><a href="#">Home</a></li>
        <li><a href="#">Services</a></li>
        <li><a href="#">Blogs</a></li>
        <li><a href="#">About</a></li>
        <li><a href="#">Contact</a></li>
      </ul>
    </div>
  </div>
  <div id="main">
    <h1>Daygostar Web Design</h1>
  </div>
</div>

<强> CSS：

* {
    padding: 0;
    margin: 0;
    font-family: arial;
}
#header {
    height: 91vh;
}
#header > img {
    width: 100%;
    height: 91vh;
    position: fixed;
    z-index: 1;
}
#content {
    height: 100vh;
    z-index: 10;
    background-color: #fff;
    position: relative;
}
#content > #navbar {
    width: 100%;
    min-height: 80px;
    background-color: #000;
}
#main {
    height: 100vh;
    border: solid blue;
    background-color: #fff;
    position: relative;
    padding-top: 200px;
    text-align: center;
    font-size: 25px;
    z-index: 1;
}
#main > * {
    margin-top: 30px;
}
#logo {
    color: #fff;
    font-size: 35px;
    float: left;
    margin-top: 15px;
    margin-left: 20px;
    cursor: pointer;
}
/*#navbar {
    position: absolute;
    top: 0;
}*/

#navbar.sticky {
    position: fixed;
    top:0;
    z-index: 100;
}

#navbar > ul {
    /* float: right; */
    width: 700px;
    list-style: none;
    margin-top: 25px;
    white-space: nowrap;
}
#navbar > ul > li {
    display: inline;
    float: none;
}
#navbar ul > li > a {
    color: #fff;
    font-size: 20px;
    text-decoration: none;
    padding: 10px 30px;
}
#navbar ul > li > a:hover {
    text-decoration: underline;
}

<强> JavaScript的：

document.addEventListener("DOMContentLoaded",function(){
  window.scrollTo(0,0);
  header.style.height = screen.height-navbar.offsetHeight;
  navbar.position_from_top = getAbsoluteOffsetFromBody(navbar).top;
  window.addEventListener("scroll", initParallex);
},false);

function initParallex(){
  bg.style.top = -(window.pageYOffset/5)+"px";
  if(window.scrollY >= navbar.position_from_top)
    $(navbar).addClass('sticky');
  else
    $(navbar).removeClass('sticky');
}

//see here: http://stackoverflow.com/a/34014786/1654250
getAbsoluteOffsetFromBody = function(el)
{   // finds the offset of el from the body or html element
    var _x = 0;
    var _y = 0;
    while( el && !isNaN( el.offsetLeft ) && !isNaN( el.offsetTop ) )
    {
        _x += el.offsetLeft - el.scrollLeft + el.clientLeft;
        _y += el.offsetTop - el.scrollTop + el.clientTop;
        el = el.offsetParent;
    }
    return { top: parseInt(_y), left: parseInt(_x) };
}

Scroll上的视差图像和Sticky标题无法正常工作

1 个答案: