Detailed explanation of the use of CSS checkbox effect

This time I will bring you a detailed explanation of the use of CSS checkbox effects. What are the precautions for using CSS checkbox. The following is a practical case, let’s take a look.

Implementation ideas

background, and label is basically the same as p in style. The existence of "symbol (E+F)" allows us to directly use the default checkbox of html, eliminating the trouble of js simulation selection.

demoSome CSS3 properties in DEMO only have the webkit prefix, so it is recommended to use a webkit-based browser to view this page

HTML code:

<p class="wrap">
    <!-- `input`的id必须有，这个是label进行元素匹配所必需的 -->
    <!-- 可以看到每个input的id和label的“for”属性对应同一字符串 -->
<input type="checkbox" id="checkbox01" />
<label for="checkbox01"></label>
<input type="checkbox" id="checkbox02" />
<label for="checkbox02"></label>
<input type="checkbox" id="checkbox03" />
<label for="checkbox03"></label>
<input type="checkbox" id="checkbox04" />
<label for="checkbox04"></label>

HTML construction is completed, followed by the corresponding css.

.wrap {
  width: 500px;
  background-color: #EEE;
  border: 2px solid #DEF;
}
/* 隐藏所有checkbox */
input[type='checkbox'] {
  display: none;
}
/* 对label进行模拟.背景图片随便拼凑的，不要吐槽品味*/
/*   transition效果是做个背景切换效果，这里单纯演示而已，实际上这个过渡不加更自然*/
label {
  display: inline-block;
  width: 60px;
  height: 60px;
  position: relative;
  background: url(//www.chitanda.me/images/blank.png);
  background-position: 0 0px;
  -webkit-transition: background 0.5s linear;
}
/*  利用相邻选择符和checkbox`:checked`的状态伪类来模拟默认选中效果（就是点击后那个勾号的效果）  */
/*如果这段代码注释，点击后将没有任何反馈给用户*/
/*因为label本身是没有点击后被选中的状态的，checkbox被隐藏后，这个状态只能手动模拟*/
input[type='checkbox']:checked+label {
  background-position: 0 -60px;
}

The effect of the above code is as follows, and it seems to be OK.

But if you think about it carefully, it seems that something is missing: the prompt text corresponding to the option

The first reaction of newcomers who don’t know CSS at this time is to use the p tag or span tag after the label. to add text. But this approach is not very elegant. Personally, I recommend using CSS’s ::before and ::after pseudo-elements (::before and :before are the same thing. However, in order to distinguish “pseudo-elements” from “pseudo-classes”, the W3C recommended writing method is to use :: for pseudo-elements). And pseudo-classes are used:)

/* 伪元素的生效很简单，定义`content`就好，其余的属性和普通p一样 */
label::after {
   content: attr(data-name);
   /*利用attr可以减少css代码量,data-name写在html部分的label属性里*/
  display: inline-block;
  position: relative;
  width: 120px;
  height: 60px;
  left: 100%;
  vertical-align: middle;
  margin: 10px;
}

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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