html - 网页上的悬停效果覆盖下拉导航栏

标签 html css

我有一个网页只使用 html 和 CSS(还没有 JavaScript)。该网页包含一个简单的固定位置标题，每个类别都有悬停下拉菜单。网页内容本身以“图 block ”的形式排列，这些图 block 在悬停时产生效果以强调它们(并链接到其他页面)。我将附上一张图片以更好地解释。下拉菜单在网页的最顶部工作正常，但是如果下拉菜单落在其中一个磁贴的顶部，下拉菜单将消失并触发磁贴悬停效果。

我已确保下拉列表的所有部分的 z-index 都大于图 block 。

下拉 HTML:

<nav class="navigation">
            <ul>
            <li class=dropdown>
                <a href="catagory1.html" class="dropdown-head">catagory1</a>
                    <div class="dropdown-content">
                      <a href="../content1.html">content1</a>
                      <a href="/content2.html">content2</a>
                      <a href="../content3.html">content3</a>
                    </div>
            </li>
            <li class="dropdown">
                <a href="catagory2.html">catagory2</a>
                <div class="dropdown-content">
                    <a href="content4">content4</a>
                    <a href="content5.html">content5</a>
                </div>
            </li>
            </ul>
        </nav>

页面内容 HTML(单个图 block 示例，代码重复):

<a href="content6.html" class="tile">
   <img src="image1.jpg>
       <div class="container">
          <div class="overlay"></div>      /* overlay that animates on hover */
          /* content for the tile */
       </div>
</a>

相关CSS:

navigation {
position: fixed;
}
.navigation li {
display: inline-block;
margin: 0 5%;
}

.dropdown {
position: relative;
display: inline-block;
z-index: 20;
}

.dropdown-content {
display: none;
position: absolute;
}

.dropdown-content a {
display: inline-block;
position: relative;
}

.dropdown-content a:hover {
background-color:  blue; 
color: white;
}

.dropdown:hover .dropdown-content{
display: block;
}

.overlay {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
height: 100%;
width: 100%;
opacity: 0;
transition: .5s ease;
z-index: 17;
}

.tile:hover .overlay {
opacity: 0.1;
}

图片 1: Top of page(Works Fine) 图片 2: Scrolled down(Hovering over Content 3 will close dropdown)

无论是否触发悬停效果，我都希望下拉菜单保留在图 block 上方。我不确定这是否需要 JavaScript。感谢您的帮助!

编辑:添加片段

/* General Rules */

* {
    margin: 0;
    padding: 0;
    border: none;
    font-family: "DM Serif Text", serif;
}
body {
    background-color: #1b1d35;
    color: whitesmoke;
    max-width: 100%;
    overflow-x: hidden;
    margin: 0 auto;
}

ul {
    margin: inherit;
    padding: none;
    border: none;
    list-style: none;
    text-align: center;

}

li {
    margin: inherit;
    padding: none;
    border: none;
}


a {
    color: whitesmoke;
    font-size: 2rem;
    display: inline-block;
    width: auto;
    height: auto;
    text-decoration: none;
    margin: 0 auto;
    transition-duration: 0.3s;


}

a:not(p):hover {
    color: #38b6ff;
}

header {
    position: fixed;
    z-index: 10;
    background-color: #7e7d7d;
    width: 100%;
    height: 10rem;
    margin: inherit;
    padding: none;
    border: none;
}

#head-logo {
    position: absolute;
    width: 15%;
    height: auto;
}

.navigation {
    position: fixed;
    z-index: 20;
    width: 100%;
    margin: 0 auto;
    border: none;
    padding: none;
    top: 5rem;
}

.navigation li {
    display: inline-block;
    margin: 0 5%;
}

.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #7e7d7d;
    box-shadow: 0 1rem 2rem 0 rgba(0,0,0,0.2);
}

.dropdown-content a {
    font-size: 1.5rem;
    color: whitesmoke;
    text-decoration: none;
    text-align: left;
    display: inline-block;
    width: 17.5rem;
}

.dropdown-content a:hover {background-color:  #7e7d7dd8; box-shadow: 1rem rgb(0,0,0); color: rgb(56, 182, 255);}
.dropdown:hover .dropdown-content{display: block;}

.sidebar {
    position: fixed;
    top: 17rem;
    margin-left: 0.1%;
    text-align: left;
}
.sidebaritem{
    font-size: 1rem;
    margin-top: 1rem;
    margin-left: 0;
    text-align: left;    
}

h3 {
    font-size: 1.5rem;
    margin: 1rem auto;
}


#main {
    position: relative;
    top: 12rem;
    width: 65%;
    margin: inherit;
}

img {
    width: 100%;
    height: auto;
}

.row {
    height: 20rem;
}
.column {
    float: left;
    width: 31%;
    padding: 1%;
    position: relative;
}

#bigtile {
    width: 64%;
    padding: 1%;
}



.container {
    position: relative;
}
/* Things that apply to all tiles */
.overlay {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100%;
    width: 100%;
    opacity: 0;
    transition: 0.5s ease;
    background-color: #38b6ff;
    z-index: 17;
}




/* Style for tiles where pictures take up full tile */
.pic-tile {
    border-top: 5px solid #38b6ff; 
}

.pic-tile .container img {
    height:100%;
    width:100%;
}

.pic-tile .container h2{
    position: absolute;
    left: 2%;
    bottom: 2rem;
    z-index: 7;
}

.pic-tile .container h3 {
    position: absolute;
    left: 2%;
    bottom: 0;
    z-index: 7;

}

.pic-tile:hover .overlay {
    opacity: 0.1;
}

/* Style for regular tiles */
.tile img {
    height: 50%;
    width: 100%;
    top: 0;
}

.tile {
    background-color: gray;
    bottom: 1%;
    text-align: end;
    position: relative;
    width: 100%;
    height: 100%;
    border-top: 5px solid #38b6ff; 
}

.tile .container{
    font-size: 1rem;
    position: relative;
    margin-bottom: 1%;
    margin-left: 1%;
}

.tile .container p{
    font-size: 1rem;
    position: relative;
    text-align: end;
    color: whitesmoke;
}

.tile:hover .overlay {
    opacity: 0.1;
}
<html>
<body>
      <!--   <img>  insert logo here -->
      <header>
            <nav class="navigation">
                <ul>
                <li class=dropdown>
                    <a href="cat1.html" class="dropdown-head">Catagory1</a>
                        <div class="dropdown-content">
                          <a href="cont1.html">content1</a>
                          <a href="cont2.html">content2</a>
                          <a href="content3.html">content3</a>
                        </div>
                </li>
                <li class="dropdown">
                    <a href="cat2.html">Catagory2</a>
                    <div class="dropdown-content">
                        <a href="content4.html">content4</a>
                        <a href="content5.html">content5</a>
                    </div>
                </li>
                <li><a href="cat3">Catagory3</a></li>
                </ul>
            </nav> 
      </header>
				

        <div id="main">


					<div class="row">

							<div class="column">
									<a href="cont8.html" class="tile">
										<div class="overlay"></div>
										<img class="image" src="img.png">
										<div class="container">
											<h2>Hello World</h2>
										</div>
									</a>
							</div>
              
              <div class="column">
									<a href="cont8.html" class="tile">
										<div class="overlay"></div>
										<img class="image" src="img.png">
										<div class="container">
											<h2>Hello World</h2>
										</div>
									</a>
							</div>
								
							<div class="column">
									<a href="cont8.html" class="tile">
										<div class="overlay"></div>
										<img class="image" src="img.png">
										<div class="container">
											<h2>Hello World</h2>
										</div>
									</a>
							</div>

						</div>


					<div class="row">

						<div class="column">
									<a href="cont8.html" class="tile">
										<div class="overlay"></div>
										<img class="image" src="img.png">
										<div class="container">
											<h2>Hello World</h2>
										</div>
									</a>
							</div>

						<div class="column">
									<a href="cont8.html" class="tile">
										<div class="overlay"></div>
										<img class="image" src="img.png">
										<div class="container">
											<h2>Hello World</h2>
										</div>
									</a>
							</div>
							
						<div class="column">
									<a href="cont8.html" class="tile">
										<div class="overlay"></div>
										<img class="image" src="img.png">
										<div class="container">
											<h2>Hello World</h2>
										</div>
									</a>
							</div>
						
					</div>
          
          <div class="row">

						<div class="column">
									<a href="cont8.html" class="tile">
										<div class="overlay"></div>
										<img class="image" src="img.png">
										<div class="container">
											<h2>Hello World</h2>
										</div>
									</a>
							</div>

						<div class="column">
									<a href="cont8.html" class="tile">
										<div class="overlay"></div>
										<img class="image" src="img.png">
										<div class="container">
											<h2>Hello World</h2>
										</div>
									</a>
							</div>
							
						<div class="column">
									<a href="cont8.html" class="tile">
										<div class="overlay"></div>
										<img class="image" src="img.png">
										<div class="container">
											<h2>Hello World</h2>
										</div>
									</a>
							</div>
						
					</div>
				
				
				
				</div>

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

最佳答案

这个问题可以通过将header的z-index改为20来解决。即使.dropdown的z-index class 为 20，header 元素的 z-index 为 10。

虽然 z-index 不是继承的，但需要考虑堆叠上下文。例如，如果兄弟元素 B 的 z-index 大于兄弟元素 A 的 z-index，则 B 将是在 A 之上。如果 A 的子元素的 z-index 高于元素 B 的子元素，则 B 仍将显示在 A 上方 前提是 B 的 z-index 大于 A。

有关堆栈上下文的更多信息，请查看此 Post .

/* General Rules */

* {
    margin: 0;
    padding: 0;
    border: none;
    font-family: "DM Serif Text", serif;
}
body {
    background-color: #1b1d35;
    color: whitesmoke;
    max-width: 100%;
    overflow-x: hidden;
    margin: 0 auto;
}

ul {
    margin: inherit;
    padding: none;
    border: none;
    list-style: none;
    text-align: center;

}

li {
    margin: inherit;
    padding: none;
    border: none;
}


a {
    color: whitesmoke;
    font-size: 2rem;
    display: inline-block;
    width: auto;
    height: auto;
    text-decoration: none;
    margin: 0 auto;
    transition-duration: 0.3s;


}

a:not(p):hover {
    color: #38b6ff;
}

header {
    position: fixed;
    z-index: 20;
    background-color: #7e7d7d;
    width: 100%;
    height: 10rem;
    margin: inherit;
    padding: none;
    border: none;
}

#head-logo {
    position: absolute;
    width: 15%;
    height: auto;
}

.navigation {
z-index:20;
    position: fixed;
    width: 100%;
    margin: 0 auto;
    border: none;
    padding: none;
    top: 5rem;
}

.navigation li {
    display: inline-block;
    margin: 0 5%;
}

.dropdown {

    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #7e7d7d;
    box-shadow: 0 1rem 2rem 0 rgba(0,0,0,0.2);
}

.content1{


}
.dropdown-content a {

    font-size: 1.5rem;
    color: whitesmoke;
    text-decoration: none;
    text-align: left;
    display: inline-block;
    width: 17.5rem;
}

.dropdown-content a:hover {background-color:  #7e7d7dd8; box-shadow: 1rem rgb(0,0,0); color: rgb(56, 182, 255);}
.dropdown:hover .dropdown-content{display: block;}

.sidebar {
    position: fixed;
    top: 17rem;
    margin-left: 0.1%;
    text-align: left;
}
.sidebaritem{
    font-size: 1rem;
    margin-top: 1rem;
    margin-left: 0;
    text-align: left;    
}

h3 {
    font-size: 1.5rem;
    margin: 1rem auto;
}


#main {
    position: relative;
    top: 12rem;
    width: 65%;
    margin: inherit;
}

img {
    width: 100%;
    height: auto;
}

.row {
    height: 20rem;
}
.column {
    float: left;
    width: 31%;
    padding: 1%;
    position: relative;
}

#bigtile {
    width: 64%;
    padding: 1%;
}



.container {
    position: relative;
}
/* Things that apply to all tiles */
.overlay {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100%;
    width: 100%;
    opacity: 0;
    transition: 0.5s ease;
    background-color: #38b6ff;
    z-index: 17;
}




/* Style for tiles where pictures take up full tile */
.pic-tile {
    border-top: 5px solid #38b6ff; 
}

.pic-tile .container img {
    height:100%;
    width:100%;
}

.pic-tile .container h2{
    position: absolute;
    left: 2%;
    bottom: 2rem;
    z-index: 7;
}

.pic-tile .container h3 {
    position: absolute;
    left: 2%;
    bottom: 0;
    z-index: 7;

}

.pic-tile:hover .overlay {
    opacity: 0.1;
}

/* Style for regular tiles */
.tile img {
    height: 50%;
    width: 100%;
    top: 0;
}

.tile {
    background-color: gray;
    bottom: 1%;
    text-align: end;
    position: relative;
    width: 100%;
    height: 100%;
    border-top: 5px solid #38b6ff; 
}

.tile .container{
    font-size: 1rem;
    position: relative;
    margin-bottom: 1%;
    margin-left: 1%;
}

.tile .container p{
    font-size: 1rem;
    position: relative;
    text-align: end;
    color: whitesmoke;
}

.tile:hover .overlay {
    opacity: 0.1;
}
<!DOCTYPE html >
<html>
<body>
      <!--   <img>  insert logo here -->
      <header>
            <nav class="navigation">
                <ul>
                <li class=dropdown>
                    <a href="cat1.html" class="dropdown-head">Catagory1</a>
                        <div class="dropdown-content">
                          <a href="cont1.html" class="content1">content1</a>
                          <a href="cont2.html">content2</a>
                          <a href="content3.html">content3</a>
                        </div>
                </li>
                <li class="dropdown">
                    <a href="cat2.html">Catagory2</a>
                    <div class="dropdown-content">
                        <a href="content4.html">content4</a>
                        <a href="content5.html">content5</a>
                    </div>
                </li>
                <li><a href="cat3">Catagory3</a></li>
                </ul>
            </nav> 
      </header>
				

        <div id="main">


					<div class="row">

							<div class="column">
									<a href="cont8.html" class="tile">
										<div class="overlay"></div>
										<img class="image" src="img.png">
										<div class="container">
											<h2>Hello World</h2>
										</div>
									</a>
							</div>
              
              <div class="column">
									<a href="cont8.html" class="tile">
										<div class="overlay"></div>
										<img class="image" src="img.png">
										<div class="container">
											<h2>Hello World</h2>
										</div>
									</a>
							</div>
								
							<div class="column">
									<a href="cont8.html" class="tile">
										<div class="overlay"></div>
										<img class="image" src="img.png">
										<div class="container">
											<h2>Hello World</h2>
										</div>
									</a>
							</div>

						</div>


					<div class="row">

						<div class="column">
									<a href="cont8.html" class="tile">
										<div class="overlay"></div>
										<img class="image" src="img.png">
										<div class="container">
											<h2>Hello World</h2>
										</div>
									</a>
							</div>

						<div class="column">
									<a href="cont8.html" class="tile">
										<div class="overlay"></div>
										<img class="image" src="img.png">
										<div class="container">
											<h2>Hello World</h2>
										</div>
									</a>
							</div>
							
						<div class="column">
									<a href="cont8.html" class="tile">
										<div class="overlay"></div>
										<img class="image" src="img.png">
										<div class="container">
											<h2>Hello World</h2>
										</div>
									</a>
							</div>
						
					</div>
          
          <div class="row">

						<div class="column">
									<a href="cont8.html" class="tile">
										<div class="overlay"></div>
										<img class="image" src="img.png">
										<div class="container">
											<h2>Hello World</h2>
										</div>
									</a>
							</div>

						<div class="column">
									<a href="cont8.html" class="tile">
										<div class="overlay"></div>
										<img class="image" src="img.png">
										<div class="container">
											<h2>Hello World</h2>
										</div>
									</a>
							</div>
							
						<div class="column">
									<a href="cont8.html" class="tile">
										<div class="overlay"></div>
										<img class="image" src="img.png">
										<div class="container">
											<h2>Hello World</h2>
										</div>
									</a>
							</div>
						
					</div>
				
				
				
				</div>

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

关于html - 网页上的悬停效果覆盖下拉导航栏，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57008674/

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