使用纯 CSS 在菜单下滑动箭头

Posted 2023-03-06

【中文标题】使用纯 CSS 在菜单下滑动箭头

【英文标题】：Using pure CSS to slide an arrow under a menu

【发布时间】：2016-11-14 15:34:22

【问题描述】：

当我悬停在菜单上时，我希望箭头会从左侧滑到我当前悬停的菜单项。

在 javascript 中，我会绑定一个事件以悬停并使用箭头元素的“左”属性进行播放，但我想知道我是否可以有一个纯 css3 动画解决方案。

箭头与此线程相似- Show border triangle in navbar using CSS

但我不希望它出现和隐藏 - 我希望箭头始终可见，并且它会根据我当前悬停的菜单从右向左滑动。

如果我在 JS 中完成，这就是它的样子：

var arrEle = $("#indication-mark-wrap");
var startHover = $(arrEle).css("left");
$("li").mouseenter(function() 
  var left = $(this).position().left;
  $(arrEle).css("left", left+30);
);

$("li").mouseleave(function() 
  $(arrEle).css("left", startHover);
);

ul 
  list-style-type: none;
  padding: 0px;


li 
  display: inline-block;
  width: 80px;
  color: white;
  background-color: black;
  height: 50px;


#indication-mark-wrap 
  position: absolute;
  left: 38px;
  top: 56px;
  background: wheat;
  -webkit-transition: all 1000ms cubic-bezier(0.000, 0.000, 0.330, 0.990);
  -moz-transition: all 1000ms cubic-bezier(0.000, 0.000, 0.330, 0.990);
  -o-transition: all 1000ms cubic-bezier(0.000, 0.000, 0.330, 0.990);
  transition: all 1000ms cubic-bezier(0.000, 0.000, 0.330, 0.990);
  /* custom */
  -webkit-transition-timing-function: cubic-bezier(0.000, 0.000, 0.330, 0.990);
  -moz-transition-timing-function: cubic-bezier(0.000, 0.000, 0.330, 0.990);
  -o-transition-timing-function: cubic-bezier(0.000, 0.000, 0.330, 0.990);
  transition-timing-function: cubic-bezier(0.000, 0.000, 0.330, 0.990);
  /* custom */


.indication-mark 
  position: relative;
  display: block;

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<div class="menu">
  <ul>
    <li>Selection1</li>
    <li>Selection2</li>
    <li>Selection2</li>
  </ul>
</div>

<div id="indication-mark-wrap">
  <canvas   class="indication-mark"></canvas>
</div>

Sample JSFiddle

【参考方案1】：

更改标记后，您可以这样做。

$(function()
$("li").click(function()
  $(".active").removeClass("active");
  $(this).addClass("active");
)
);

ul 
  list-style-type: none;
  padding: 0px;


li 
  background-color: black;


li:nth-child(-n+3) 
  display: inline-block;
  width: 80px;
  color: white;
  height: 50px;


#indication-mark-wrap 
  position: absolute;
  left: 35px;
  top: 56px;
  background: wheat;
  -webkit-transition: all 1000ms cubic-bezier(0.000, 0.000, 0.330, 0.990);
  -moz-transition: all 1000ms cubic-bezier(0.000, 0.000, 0.330, 0.990);
  -o-transition: all 1000ms cubic-bezier(0.000, 0.000, 0.330, 0.990);
  transition: all 1000ms cubic-bezier(0.000, 0.000, 0.330, 0.990);
  /* custom */
  -webkit-transition-timing-function: cubic-bezier(0.000, 0.000, 0.330, 0.990);
  -moz-transition-timing-function: cubic-bezier(0.000, 0.000, 0.330, 0.990);
  -o-transition-timing-function: cubic-bezier(0.000, 0.000, 0.330, 0.990);
  transition-timing-function: cubic-bezier(0.000, 0.000, 0.330, 0.990);
  /* custom */


.indication-mark 
  position: relative;
  display: block;


li:nth-child(2):hover ~ li #indication-mark-wrap 
  left: 118px;

li:nth-child(3):hover ~ li #indication-mark-wrap 
  left: 200px;

 
li:nth-child(1).active ~ li #indication-mark-wrap 
  left: 35px;


li:nth-child(2).active ~ li #indication-mark-wrap 
  left: 118px;

li:nth-child(3).active ~ li #indication-mark-wrap 
  left: 200px;


#indication-mark-wrap:before,
#indication-mark-wrap:after 
  content: "";
  position: absolute;
  top: 15px;
  width: 0;
  height 0;
  border-left: 15px solid transparent;
  border-right: 15px solid transparent;
  border-bottom: 15px solid white;

#indication-mark-wrap:before 
  top: 14px;
  border-bottom-color: black;

.active 
  background-color: darkcyan;

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<div class="menu">
  <ul>
    <li class="active">Selection1</li>
    <li>Selection2</li>
    <li>Selection2</li>
    <li class="test"><div id="indication-mark-wrap"></div></li>
  </ul>
</div>

仅限 CSS

ul 
  list-style-type: none;
  padding: 0px;

li 
  background-color: black;

li:nth-child(-n+3) 
  display: inline-block;
  width: 80px;
  color: white;
  height: 50px;

li:nth-child(-n+3) label 
  display: inline-block;
  width: 100%;
  height: 100%;
  cursor: inherit;


#indication-mark-wrap 
  position: absolute;
  left: 35px;
  top: 56px;
  background: wheat;
  -webkit-transition: all 1000ms cubic-bezier(0.000, 0.000, 0.330, 0.990);
  -moz-transition: all 1000ms cubic-bezier(0.000, 0.000, 0.330, 0.990);
  -o-transition: all 1000ms cubic-bezier(0.000, 0.000, 0.330, 0.990);
  transition: all 1000ms cubic-bezier(0.000, 0.000, 0.330, 0.990);
  /* custom */
  -webkit-transition-timing-function: cubic-bezier(0.000, 0.000, 0.330, 0.990);
  -moz-transition-timing-function: cubic-bezier(0.000, 0.000, 0.330, 0.990);
  -o-transition-timing-function: cubic-bezier(0.000, 0.000, 0.330, 0.990);
  transition-timing-function: cubic-bezier(0.000, 0.000, 0.330, 0.990);
  /* custom */


.indication-mark 
  position: relative;
  display: block;


#s1, #s2, #s3 
  display: none;
 
#s1:checked ~ ul #indication-mark-wrap 
  left: 35px;

#s2:checked ~ ul #indication-mark-wrap 
  left: 118px;

#s3:checked ~ ul #indication-mark-wrap 
  left: 200px;

li:nth-child(-n+3):hover 
  background: darkgray;
  cursor: pointer;

#s1:checked ~ ul li:nth-child(1),
#s2:checked ~ ul li:nth-child(2),
#s3:checked ~ ul li:nth-child(3) 
  background-color: darkcyan;
  cursor: auto;


#indication-mark-wrap:before,
#indication-mark-wrap:after 
  content: "";
  position: absolute;
  top: 15px;
  width: 0;
  height 0;
  border-left: 15px solid transparent;
  border-right: 15px solid transparent;
  border-bottom: 15px solid white;

#indication-mark-wrap:before 
  top: 14px;
  border-bottom-color: black;

<div class="menu">
  <input type="radio" id="s1" name="s123" checked="checked">
  <input type="radio" id="s2" name="s123">
  <input type="radio" id="s3" name="s123">
  <ul>
    <li><label for="s1">Selection1</label></li>
    <li><label for="s2">Selection2</label></li>
    <li><label for="s3">Selection3</label></li>
    <li class="test"><div id="indication-mark-wrap"></div></li>
  </ul>
</div>

【讨论】：

我添加了对“活动”选项卡的支持，只有 javascript 用于单击，这是可以的，因为它是由引导选项卡添加的。现在它非常适合我的需求。

@ZivWeissman 更新了 2:nd 示例，仅使用 CSS 的活动选项卡（如果您想无脚本）

很好，我喜欢标签技巧... ;) 添加到样式 cursor:pointer（不是 .active），它是一个非常酷的 CSS 即插即用菜单！