水平下拉列表的子菜单不会垂直

时间：2016-04-24 15:55:51

标签： html css

我正在使用具有子菜单的水平下拉菜单。 这个子菜单应该是垂直的，但它是水平的。 我在这个论坛上试过类似问题的解决方案，但他们不适合我。

＆＃13;
＆＃13; 
* {
	margin: 0;
	padding: 0;
}
body{
	font-family: 'Francois One', Arial, Helvetica, sans-serif;
	color: white;
	text-align:center;	
}
.corpo{
	margin-top: 5px;
	margin-left:  20%;
	margin-right: 15%;
	float:middle;
	
}
header{
	margin: 40px 0;
}
.menu li{
	display: block;
	float: left;
	clear: right;
	width: 10%;
	height: 50px;
	line-height: 50px;
	text-align: center;
	color: #2C3E50;
	border-right: 1px solid #2C3E50;
	background: -webkit-linear-gradient(top, #FFFF00 50%, #FFFF00 51%, #f6f6f6 100%);
	background: -moz-linear-gradient(top, #FFFF00 50%, #FFFF00 51%, #f6f6f6 100%);
	background: -o-linear-gradient(top, #FFFF00 50%, #FFFF00 51%, #f6f6f6 100%);
	background: -ms-linear-gradient(top, #FFFF00 50%, #FFFF00 51%, #f6f6f6 100%);
	border-color:black;
	opacity:1;
	position:relative;
}
.menu li:hover{
	cursor: pointer;
	background: -webkit-radial-gradient(center, ellipse cover, #ffffff 0%, #e5e5e5 100%);
	background: -moz-radial-gradient(center, ellipse cover, #ffffff 0%, #e5e5e5 100%);
	background: -o-radial-gradient(center, ellipse cover, #ffffff 0%, #e5e5e5 100%);
	background: -ms-radial-gradient(center, ellipse cover, #ffffff 0%, #e5e5e5 100%);
	color: slateGrey;
	border-color:black;
	position:relative;
}
.primo{
	border-top-left-radius: 10px;
	border-bottom-left-radius: 10px;
}
.ultimo{
	border-top-right-radius: 10px;
	border-bottom-right-radius: 10px;
}
.sub-menu{
	visibility: hidden;
	width: 1000%;
	float:center;
	
	
	
}
.menu li:hover .sub-menu{
	visibility: visible;
	
}
.menu li:hover .sub-menu li{
	visibility: visible;
	display:inline;
	clear:left;
	clear:right;


	
	
} 
.sub-menu li{
	border-top: 1px dotted #2C3E50;
	
}
.sub-menu li:hover{
	width: 145px;
	background: -webkit-radial-gradient(center, ellipse cover, #f7fbfc 10%, #add9e4 100%);
	background: -moz-radial-gradient(center, ellipse cover, #f7fbfc 10%, #add9e4 100%);
	background: -o-radial-gradient(center, ellipse cover, #f7fbfc 10%, #add9e4 100%);
	background: -ms-radial-gradient(center, ellipse cover, #f7fbfc 10%, #add9e4 100%);
	transition: all 0.1s ease 0s;
	-webkit-transition: all 0.1s ease 0s;
	-moz-transition: all 0.1s ease 0s;
	-o-transition: all 0.1s ease 0s;
	-ms-transition: all 0.1s ease 0s;
}
.ultimo-sub{
	border-bottom-left-radius: 10px;
	border-bottom-right-radius: 10px;
}

.menu li a:link{
color:black;
text-decoration:none;
}

.menu li a:hover{
color:black;
text-decoration:none;
}

.menu li a:active{
color:black;
text-decoration:none;

}

.menu ul li:hover ul{
	position:relative;
	display:block;
}

.menu li a:visited{
color:black;
text-decoration:none;

}

p{
	color: #FFFF00;
	margin: 0px 380px 0px 400px;
	font-size:150%;
	text-shadow: 2px 0 0 #000, 0 -1px 0 #000, 0 2px 0 #000, -1px 0 0 #000;               //text-shadow: 2px 0 0 #000, 0 -1px 0 #000, 0 2px 0 #000, -1px 0 0 #000;
	
}

.Paragrafo{
	text-shadow:1px 0 0 #000, 0 -1px 0 #000, 0 1px 0 #000, -1px 0 0 #000;
	size:25px;
}

.Paragrafo  a:link{
color:yellow;
}

.Paragrafo a:hover{
color:yellow;
}

.Paragrafo  a:active{
color:yellow;
}

.Paragrafo  a:visited{
color:yellow;
}

h1{
	color:blue;
	
}

span{
	color: #FFFF00;
	margin: 0px 380px 0px 400px;
	font-size:150%;
	text-shadow: 2px 0 0 #000, 0 -1px 0 #000, 0 2px 0 #000, -1px 0 0 #000;               //text-shadow: 2px 0 0 #000, 0 -1px 0 #000, 0 2px 0 #000, -1px 0 0 #000;
	
}

.video{
	position: 404 532;
}
＆＃13; 
<!doctype html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>Menù a tendina in HTML e CSS</title>
		<link rel="stylesheet" type="text/css" href="new 1(!).css">
		<style> h1 {color:yellow;
		            float:center;
		           } </style>		   
	</head>		   
	 <body background="ww1.png" class="1">
	 
	
		
		 <header>
				<h1>La Grande Guerra</h1>
		 </header>
		<div class="corpo">
			<ul class="menu">
				<li class="primo"><a href="SitoHome2(!).html">Home</a></li>
				<li><a href="1914.html">1914</a>
				</li>
				<li><a href="1915.html">1915</a>
					<ul class="sub-menu">
						<li><a href="1915-1.html">Da 01 a 04</a></li>
						<li><a href="1915-2.html">Da 05 a 08</a></li>
						<li class="ultimo-sub"><a href="1915-3.html">Da 09 a 12</a></li>
					</ul>
				</li>
				<li><a href="1916.html">1916</a>
					<ul class="sub-menu">
						<li><a href="1916-1.html">Da 01 a 04</a></li>
						<li><a href="1916-2.html">Da 05 a 08</a></li>
						<li class="ultimo-sub"><a href="1916-3.html">Da 09 a 12</a></li>
					</ul>
				</li>
				<li><a href="1917.html">1917</a>
					<ul class="sub-menu">
						<li><a href="1917-1.html">Da 01 a 04</a></li>
						<li><a href="1917-2.html">Da 05 a 08</a></li>
						<li class="ultimo-sub"><a href="1917-3.html">Da 09 a 12</a></li>
					</ul>
			    </li>
				<li><a href="1918.html">1918</a>
					<ul class="sub-menu">
						<li class="ultimo-sub"><a href="1918-1.html">Eventi</a></li>
				    </ul>
				</li>
				<li><a href="#">Armistizio</a>
					<ul class="sub-menu">
						<li class="ultimo-sub"><a href="#">Conseguenze</a></li>
				    </ul>
				</li>
				<li><a href="Galleria.html">Galleria</a>
					<ul class="sub-menu">
				    </ul>
				</li>
				<li class="ultimo"><a href="Fonti.html">Fonti</A></li>
				
			</ul>
		</div> <BR> <br> <br> <br> <br> <br> <br> 
		<div class=Paragrafi>
		<p>
        TEXT
		<object class=video width="420" height="315"data="https://www.youtube.com/embed/6FgaL0xIazk?list=PLB2vhKMBjSxOb_127vxjaRRC7yu2TJlJX"
		float=left align=right>
        </object>
		</p>
		<p align=left>
        Text
		</p> 
		 

		
  </body>
</html>
＆＃13;
＆＃13;
＆＃13;

1 个答案:

答案 0 :(得分：0)

问题在于您的清晰财产。您正在使用clear:left;覆盖clear:right;。您应该使用clear: both;代替

.menu li:hover .sub-menu li{
    visibility: visible;
    display:inline;
    clear:left; /* this property gets overwritten by clear: right */
    clear:right;
}

修复

 .menu li:hover .sub-menu li{
        visibility: visible;
        display:inline;
        clear:both;
    }


* {
  margin: 0;
  padding: 0;
}
body {
  font-family: 'Francois One', Arial, Helvetica, sans-serif;
  color: white;
  text-align: center;
}
.corpo {
  margin-top: 5px;
  margin-left: 20%;
  margin-right: 15%;
  float: middle;
}
header {
  margin: 40px 0;
}
.menu li {
  display: block;
  float: left;
  clear: right;
  width: 10%;
  height: 50px;
  line-height: 50px;
  text-align: center;
  color: #2C3E50;
  border-right: 1px solid #2C3E50;
  background: -webkit-linear-gradient(top, #FFFF00 50%, #FFFF00 51%, #f6f6f6 100%);
  background: -moz-linear-gradient(top, #FFFF00 50%, #FFFF00 51%, #f6f6f6 100%);
  background: -o-linear-gradient(top, #FFFF00 50%, #FFFF00 51%, #f6f6f6 100%);
  background: -ms-linear-gradient(top, #FFFF00 50%, #FFFF00 51%, #f6f6f6 100%);
  border-color: black;
  opacity: 1;
  position: relative;
}
.menu li:hover {
  cursor: pointer;
  background: -webkit-radial-gradient(center, ellipse cover, #ffffff 0%, #e5e5e5 100%);
  background: -moz-radial-gradient(center, ellipse cover, #ffffff 0%, #e5e5e5 100%);
  background: -o-radial-gradient(center, ellipse cover, #ffffff 0%, #e5e5e5 100%);
  background: -ms-radial-gradient(center, ellipse cover, #ffffff 0%, #e5e5e5 100%);
  color: slateGrey;
  border-color: black;
  position: relative;
}
.primo {
  border-top-left-radius: 10px;
  border-bottom-left-radius: 10px;
}
.ultimo {
  border-top-right-radius: 10px;
  border-bottom-right-radius: 10px;
}
.sub-menu {
  visibility: hidden;
  width: 1000%;
  float: center;
}
.menu li:hover .sub-menu {
  visibility: visible;
}
.menu li:hover .sub-menu li {
  visibility: visible;
  display: inline;
  clear: both;
}
.sub-menu li {
  border-top: 1px dotted #2C3E50;
}
.sub-menu li:hover {
  width: 145px;
  background: -webkit-radial-gradient(center, ellipse cover, #f7fbfc 10%, #add9e4 100%);
  background: -moz-radial-gradient(center, ellipse cover, #f7fbfc 10%, #add9e4 100%);
  background: -o-radial-gradient(center, ellipse cover, #f7fbfc 10%, #add9e4 100%);
  background: -ms-radial-gradient(center, ellipse cover, #f7fbfc 10%, #add9e4 100%);
  transition: all 0.1s ease 0s;
  -webkit-transition: all 0.1s ease 0s;
  -moz-transition: all 0.1s ease 0s;
  -o-transition: all 0.1s ease 0s;
  -ms-transition: all 0.1s ease 0s;
}
.ultimo-sub {
  border-bottom-left-radius: 10px;
  border-bottom-right-radius: 10px;
}
.menu li a:link {
  color: black;
  text-decoration: none;
}
.menu li a:hover {
  color: black;
  text-decoration: none;
}
.menu li a:active {
  color: black;
  text-decoration: none;
}
.menu ul li:hover ul {
  position: relative;
  display: block;
}
.menu li a:visited {
  color: black;
  text-decoration: none;
}
p {
  color: #FFFF00;
  margin: 0px 380px 0px 400px;
  font-size: 150%;
  text-shadow: 2px 0 0 #000, 0 -1px 0 #000, 0 2px 0 #000, -1px 0 0 #000;               //text-shadow: 2px 0 0 #000, 0 -1px 0 #000, 0 2px 0 #000, -1px 0 0 #000;
}
.Paragrafo {
  text-shadow: 1px 0 0 #000, 0 -1px 0 #000, 0 1px 0 #000, -1px 0 0 #000;
  size: 25px;
}
.Paragrafo a:link {
  color: yellow;
}
.Paragrafo a:hover {
  color: yellow;
}
.Paragrafo a:active {
  color: yellow;
}
.Paragrafo a:visited {
  color: yellow;
}
h1 {
  color: blue;
}
span {
  color: #FFFF00;
  margin: 0px 380px 0px 400px;
  font-size: 150%;
  text-shadow: 2px 0 0 #000, 0 -1px 0 #000, 0 2px 0 #000, -1px 0 0 #000;               //text-shadow: 2px 0 0 #000, 0 -1px 0 #000, 0 2px 0 #000, -1px 0 0 #000;
}
.video {
  position: 404 532;
}
<!doctype html>
<html>

<head>
  <meta charset="UTF-8">
  <title>Menù a tendina in HTML e CSS</title>
  <link rel="stylesheet" type="text/css" href="new 1(!).css">
  <style>
    h1 {
      color: yellow;
      float: center;
    }
  </style>
</head>

<body background="ww1.png" class="1">



  <header>
    <h1>La Grande Guerra</h1>
  </header>
  <div class="corpo">
    <ul class="menu">
      <li class="primo"><a href="SitoHome2(!).html">Home</a>
      </li>
      <li><a href="1914.html">1914</a>
      </li>
      <li><a href="1915.html">1915</a>
        <ul class="sub-menu">
          <li><a href="1915-1.html">Da 01 a 04</a>
          </li>
          <li><a href="1915-2.html">Da 05 a 08</a>
          </li>
          <li class="ultimo-sub"><a href="1915-3.html">Da 09 a 12</a>
          </li>
        </ul>
      </li>
      <li><a href="1916.html">1916</a>
        <ul class="sub-menu">
          <li><a href="1916-1.html">Da 01 a 04</a>
          </li>
          <li><a href="1916-2.html">Da 05 a 08</a>
          </li>
          <li class="ultimo-sub"><a href="1916-3.html">Da 09 a 12</a>
          </li>
        </ul>
      </li>
      <li><a href="1917.html">1917</a>
        <ul class="sub-menu">
          <li><a href="1917-1.html">Da 01 a 04</a>
          </li>
          <li><a href="1917-2.html">Da 05 a 08</a>
          </li>
          <li class="ultimo-sub"><a href="1917-3.html">Da 09 a 12</a>
          </li>
        </ul>
      </li>
      <li><a href="1918.html">1918</a>
        <ul class="sub-menu">
          <li class="ultimo-sub"><a href="1918-1.html">Eventi</a>
          </li>
        </ul>
      </li>
      <li><a href="#">Armistizio</a>
        <ul class="sub-menu">
          <li class="ultimo-sub"><a href="#">Conseguenze</a>
          </li>
        </ul>
      </li>
      <li><a href="Galleria.html">Galleria</a>
        <ul class="sub-menu">
        </ul>
      </li>
      <li class="ultimo"><a href="Fonti.html">Fonti</A>
      </li>

    </ul>
  </div>
  <BR>
  <br>
  <br>
  <br>
  <br>
  <br>
  <br>
  <div class=Paragrafi>
    <p>
      TEXT
      <object class=video width="420" height="315" data="https://www.youtube.com/embed/6FgaL0xIazk?list=PLB2vhKMBjSxOb_127vxjaRRC7yu2TJlJX" float=left align=right>
      </object>
    </p>
    <p align=left>
      Text
    </p>



</body>

</html>

额外备注：没有float: center;或float: middle;这样的内容，请参阅float docs on mdn 您还没有正确使用position，请参阅position docs on mdn

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