我正试图在边框上获得过渡悬停效果,边框会在悬停时展开。
h1 {
color: #666;
}
h1:after {
position: absolute;
left: 10px;
content: '';
height: 40px;
width: 275px;
border-bottom: solid 3px #019fb6;
transition: left 250ms ease-in-out, right 250ms ease-in-out;
opacity: 0;
}
h1:hover:after {
opacity: 1;
}
<h1>CSS IS AWESOME</h1>
我在Jsfiddle
上试过了答案 0 :(得分:130)
要在悬停时展开底部边框,您可以使用transform:scaleX'();
(mdn reference)并在悬停状态下将其从0转换为1.
以下是边框悬停效果的示例:
边框和过渡设置在伪元素上,以防止转换文本并避免添加标记。
要从左侧或右侧展开底部边框,您可以将transform-origin property更改为伪元素的左侧或右侧:
h1 { color: #666;display:inline-block; margin:0;text-transform:uppercase; }
h1:after {
display:block;
content: '';
border-bottom: solid 3px #019fb6;
transform: scaleX(0);
transition: transform 250ms ease-in-out;
}
h1:hover:after { transform: scaleX(1); }
h1.fromRight:after{ transform-origin:100% 50%; }
h1.fromLeft:after{ transform-origin: 0% 50%; }
<h1 class="fromCenter">Expand from center</h1><br/>
<h1 class="fromRight">Expand from right</h1><br/>
<h1 class="fromLeft">Expand from left</h1>
注意:您需要添加供应商前缀以最大限度地提高浏览器支持(请参阅canIuse)。
当文本跨越2行时,您可以实现此效果。 before伪元素绝对定位为使用bottom:1.2em;
:
h1 { position:relative;color: #666;display:inline-block; margin:0;text-transform:uppercase;text-align:center;line-height:1.2em; }
h1:after, h1:before {
display:block;
content: '';
border-bottom: solid 3px #019fb6;
transform: scaleX(0);
transition: transform 250ms ease-in-out;
}
h1:before{
position:absolute;
bottom:1.2em; left:0;
width:100%;
}
.ef2:hover:after {
transition-delay:150ms;
}
h1:hover:after, h1:hover:before { transform: scaleX(1); }
<h1>Expand border<br/>on two lines</h1>
<br/>
<br/>
<h1 class="ef2">Expand border<br/>effect two</h1>
关键是在悬停状态下将变换原点位置从一侧更改为另一侧。这样底部的boder 在悬停时从一侧进入,在另一侧时退出,此时元素不再悬停。
这是一个演示:
h1 { color: #666;display:inline-block; margin:0;text-transform:uppercase; }
h1:after {
display:block;
content: '';
border-bottom: solid 3px #019fb6;
transform: scaleX(0);
transition: transform 250ms ease-in-out;
}
h1.fromLeft:after{ transform-origin: 100% 50%; }
h1.fromRight:after{ transform-origin: 0% 50%; }
h1.fromLeft:hover:after{ transform: scaleX(1); transform-origin: 0% 50%; }
h1.fromRight:hover:after{ transform: scaleX(1); transform-origin: 100% 50%; }
<h1 class="fromRight">Expand from right</h1><br/>
<h1 class="fromLeft">Expand from left</h1>
答案 1 :(得分:6)
我们只能使用background
来做到这一点。无需伪元素。这样更灵活。
h1 {
/* you can change these variables to control the border */
--border-color: purple;
--border-width: 5px;
--bottom-distance: 0px; /* you can increase this */
color: #666;
display: inline-block;
background-image: linear-gradient(var(--border-color), var(--border-color));
background-size: 0% var(--border-width);
background-repeat: no-repeat;
transition: background-size 0.3s;
margin: 5px 0;
}
.fromCenter {
background-position: 50% calc(100% - var(--bottom-distance));
}
.fromRight {
background-position: 100% calc(100% - var(--bottom-distance));
}
.fromLeft {
background-position: 0 calc(100% - var(--bottom-distance))
}
h1:hover {
background-size: 100% var(--border-width);
}
<h1 class="fromCenter">Expand from center</h1><br/>
<h1 class="fromRight">Expand from right</h1><br/>
<h1 class="fromLeft">Expand from left</h1>
多行动画:
h1 {
/* you can change these variables to control the border */
--border-color: purple;
--border-width: 5px;
--bottom-distance: 0px; /* you can increase this */
color: #666;
display: inline; /* should be 'inline' for multiple line animation */
background-image: linear-gradient(var(--border-color), var(--border-color));
background-size: 0% var(--border-width);
background-repeat: no-repeat;
transition: background-size 0.5s;
}
.fromCenter {
background-position: 50% calc(100% - var(--bottom-distance));
}
.fromRight {
background-position: 100% calc(100% - var(--bottom-distance));
}
.fromLeft {
background-position: 0 calc(100% - var(--bottom-distance))
}
h1:hover {
background-size: 100% var(--border-width);
}
<h1 class="fromLeft">Expand from <br>left with <br>multiple line</h1>
答案 2 :(得分:4)
我知道这是一个老帖子,它已经回答了,但你也可能会喜欢以下效果。
<div class="cd-single-point">
<a class="cd-img-replace" href="#0"></a>
</div>
.cd-single-point {
position: absolute;
list-style-type: none;
left: 20px;
top: 20px;
}
.cd-single-point>a {
position: relative;
z-index: 2;
display: block;
width: 10px;
height: 10px;
border-radius: 50%;
background: #0079ff;
-webkit-transition: background-color 0.2s;
-moz-transition: background-color 0.2s;
-o-transition: background-color 0.2s;
transition: background-color 0.2s;
}
.cd-single-point::after {
content: '';
position: absolute;
border-radius: 50%;
width: 100%;
height: 100%;
top: 0;
left: 0;
animation: cd-pulse 2s infinite;
}
@keyframes cd-pulse
{
0% {box-shadow:0 0 0 0 #0079ff}
100%{box-shadow:0 0 0 20px rgba(255,150,44,0)}
}
答案 3 :(得分:2)
我们可以使用简单的过渡效果。
HTML
<h1>CSS IS AWESOME</h1>
CSS
h1 {
color: #666;
position: relative;
display: inline-block;
}
h1:after {
position: absolute;
left: 50%;
content: '';
height: 40px;
height: 5px;
background: #f00;
transition: all 0.5s linear;
width: 0;
bottom: 0;
}
h1:hover:after {
width: 270px;
margin-left: -135px;
}
链接到Fiddle
答案 4 :(得分:1)
答案 5 :(得分:1)
h1 {
color: #666;
display:inline-block;
margin:0;
text-transform:uppercase;
}
h1:after {
display:block;
content: '';
border-bottom: solid 3px #92a8d1;
transform: scaleX(0);
transition: transform 800ms ease-in-out;
}
h1:hover:after {
transform: scaleX(1);
}
&#13;
<h1 class="fromCenter">Hover Over Me</h1><br/>
&#13;
答案 6 :(得分:0)
h1 {
color: #666;
}
h1:after {
position: absolute;
left: 10px;
content: '';
height: 40px;
width: 275px;
border-bottom: solid 3px #019fb6;
transition: opacity 450ms ease-in-out;
opacity: 0;
}
h1:hover:after {
opacity: 1;
}
<h1>CSS IS AWESOME</h1>
答案 7 :(得分:0)
简单轻量级版本
li {
margin-bottom: 10px;
}
.cool-link {
display: inline-block;
color: #000;
text-decoration: none;
}
.cool-link::after {
content: '';
display: block;
width: 0;
height: 2px;
background: #000;
transition: width .3s;
}
.cool-link:hover::after {
width: 100%;
//transition: width .3s;
}
<ul>
<li><a class="cool-link" href="#">A cool link</a></li>
<li><a class="cool-link" href="#">A cool link</a></li>
<li><a class="cool-link" href="#">A cool link</a></li>
</ul>