纯CSS图像滑块
[英]Pure CSS image slider
问题描述
<!DOCTYPE html>
<html>
<head>
<style>
html,body{
height:100%;
width:100%;
margin:0%;
Padding:0%;
}
.wrap{
height:100%;
width:100%;
position:relative;
overflow:hidden;
background:#120103;
color:#fff;
text-align:center;
}
header{
background:#3E474F;
box-shadow:0 .5em 1em #111;
position:absolute;
z-index:900;
width:100%;
}
header label{
color:#788188;
cursor:pointer;
display:inline-block;
line-height:4.25em;
font-size:.667em;
font-weight:bold;
padding:0 1em;
}
header label:hover{
background:#2e353b;
}
.slide{
width:100%;
height:100%;
position:absolute;
top:0%;
left:100%;
z-index:10;
padding:8em 1em 0;
background-color:#120103;
background-position:50% 50%;
background-size:cover;
transition:left 0s .75s;
}
[id^= "slide"]:checked + .slide{
left:0;
z-index:100;
transition:left .65s ease-out;
}
img{
height:250px;
width:250px;
Margin:20px;
Overflow:none;
display:block;
}
.overlay {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
height: 100%;
width: 100%;
opacity: 0;
transition: .5s ease;
background-color: #008CBA;
}
.slide-one:hover .overlay{
opacity:0.5;
}
.slide-two:hover .overlay{
opacity:0.5;
}
.slide-three:hover .overlay{
opacity:0.5;
}
.text {
color: white;
font-size: 20px;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
.slide-one{
background-image:url('wow.jpg');
}
.slide-two{
background-image:url('Anonymous.jpg ');
}
.slide-three{
background-image:url('1.jpg');
}
</style>
</head>
<body>
<div class="wrap">
<header>
<label for="slide-1-trigger">Slide One</label>
<label for="slide-2-trigger">Slide Two</label>
<label for="slide-3-trigger">Slide Three</label>
</header>
<input id="slide-1-trigger" type="radio" name="slide" checked>
<section class="slide slide-one">
<div class="overlay">
<div class="text">Ethical Hacking is licensed hacking.... <a
href="https://en.wikipedia.org/wiki/Certified_Ethical_Hacker">Read More</a>
</div>
</div>
</section>
<input id="slide-2-trigger" type="radio" name="slide" >
<section class="slide slide-two" >
<div class='overlay'>
<div class="text">A rather famous group of hackers and tech savvys spread
across the world....<a
href="https://en.wikipedia.org/wiki/Anonymous_(group)">Read More</a></div>
</div>
</section>
<input id="slide-3-trigger" type="radio" name="slide" >
<section class="slide slide-three" >
<div class='overlay'>
<div class="text">Just Checking</div>
</div>
</div>
</body>
</html>
Hello everybody , i was watching a video on making a CSS image slider after watching the whole video i wrote the above code but am having some problem understanding this particular piece of code: 
大家好，观看完整个视频后，我正在观看有关制作CSS图像滑块的视频，但是我在编写上述代码时遇到了一些问题：
[id^= "slide"]:checked + .slide{
left:0;
z-index:100;
transition:left .65s ease-out;
}
I need help understanding this part of the code. 我需要帮助来理解代码的这一部分。 Thank you for help in advance :) 预先感谢您的帮助:)
2 个解决方案
解决方案1
1 2017-05-06 15:22:59
First off it seems you understand the fundamental principles of CSS but if I am wrong and you do not, I recommend the tutorials of MDN about How CSS works and the Syntax . 首先，您似乎似乎了解CSS的基本原理，但是如果我错了却没有错，我建议MDN关于CSS的工作原理和语法的教程。
So piece by piece... 所以一点一点...
1. [id^= "slide"]:checked + .slide 1. [id^= "slide"]:checked + .slide
This is the selector and consists of two major parts: [id^= "slide"]:checked and .slide , connected by a + sign. 这是选择器，由两个主要部分组成： [id^= "slide"]:checked和.slide ，由+号连接。 I assume that you know what .slide means on its own. 我假设您知道.slide是什么意思。 If not, you should read the articles that I posted above. 如果没有，您应该阅读我上面发布的文章。
1.1. 1.1。 +
The + operator with the x + y syntax selects all elements that would be selected by pure y but it limits the selection to only those elements directly following other elements which would be selected by x . 具有x + y语法的+运算符选择将由纯y选择的所有元素，但将选择范围限制为仅直接位于将由x选择的其他元素之后的那些元素。 So if you have .a + .b then you get all elements with the class b directly preceded by elements with the class a : 所以，如果你有.a + .b那么你得到与类的所有元素b的元素之前直接与类a ：
div { border: 1px dashed black; padding: 1em; margin: 1em; } .wupwupwup + .nanana { background: red; }
This selects all .nanana directly after .wupwupwup. <div class="nanana wupwupwup">This is not selected because there is no .wupwupwup before.</div> <div class="wupwupwup">This is not selected because it has no .nanana class</div> <div class="nanana">This is selected because it has .wupwupwup before and itself matches .nanana</div> <div>This is not selected because it does not match .nanana and also because the previous element does not match .wupwupwup</div>
1.2. 1.2。 [id^="slide"]:checked
This one again consists of two selectors: [id^="slide"] and :checked . 这又由两个选择器组成： [id^="slide"]和:checked 。 :checked is explained very simply: x:checked selects all elements that match x as long as they are "checked". :checked的解释非常简单： x:checked选择所有与x匹配的元素，只要它们被“选中”即可。 An element is "checked" for example if it is a checkbox or radio button and is checked. 例如，如果元素是复选框或单选按钮并被选中，则将其“选中”。 So we now need to examine the x in this case [id^="slide"] . 因此，在这种情况下，我们现在需要检查x [id^="slide"] 。 That is a selector which selects all elements which have an attribute id which starts with slide . 这是一个选择器，用于选择所有具有id以slide开头的属性id元素。 So it would select all elements with ids like slide , slide-1-trigger , slide-2-trigger , slider , and so on. 所以它会选择具有类似ID的所有元素slide ， slide-1-trigger ， slide-2-trigger ， slider ，等等。
So what the whole [id^= "slide"]:checked + .slide does can be explained like this: It selects all elements with the class slide that directly follow a "checked" element with an ID that begins with slide . 那么什么整个[id^= "slide"]:checked + .slide确实可以这样解释：它选择与类的所有元素slide直接跟随一个“选中”与开头的ID元件slide 。
In your case ... 就您而言...
... this means, that for example the element <section class="slide slide-one"> after a checked <input id="slide-1-trigger" type="radio" name="slide" checked> will be selected. ...这意味着，例如元素<section class="slide slide-one">在选中<input id="slide-1-trigger" type="radio" name="slide" checked>已选择。
2. The rules 2.规则
{
left:0;
z-index:100;
transition:left .65s ease-out;
}
First off: You can read about transitions on MDN. 首先，您可以阅读有关 MDN 过渡的信息。 What your transition basically does is: Make the change of the property left to the value 0 smooth for 0.65 seconds. 你的转变通常做的就是：使属性的改变left到值0光滑的0.65秒。 While it does this, it subtly uses a special easing function called ease-out but you can omit that probably without noticeable differences. 在此过程中，它巧妙地使用了一种特殊的缓动功能，称为缓和功能ease-out但是您可以忽略它而不会产生明显的差异。 The z-index of 100 makes this current slide the top-most so that it is not hidden behind the other slides. z-index为100 ，此当前幻灯片位于最上方，因此不会隐藏在其他幻灯片后面。
Another thing ... 另一件事 ...
... that you may have missed: The <label ...> elements that you use will mark the corresponding <input ...> elements as checked if you click on the labels. ...您可能已经错过了：如果单击标签，则使用的<label ...>元素会将相应的<input ...>元素标记为已checked 。 That is why their state changes and then the :checked selector takes effect. 这就是为什么它们的状态改变，然后:checked选择器生效的原因。
解决方案2
0 2017-05-06 12:04:58
:checked is a CSS pseudo-class selector that represents any radio, checkbox or option that has been checked/clicked. :checked是一个CSS伪类选择器，它代表已选中/单击的所有单选，复选框或选项。 That segment of CSS is just targeting any id of slide-trigger and performing a transition left when the :checked pseudo-class is active. CSS的该段仅针对任何滑动触发的id，并在:checked伪类处于活动状态时向左执行过渡。 I hope that was helpful 希望对您有所帮助
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