Detailed explanation of CSS and HTML custom checkbox effects

Checkbox should be a relatively common HTML function, but the checkbox that comes with the browser is often not very good-looking, and the effects are different in different browsers. Out of the need to beautify and unify visual effects, the customization of checkbox was proposed. This article mainly shares with you the effect of CSS+HTML custom checkbox. Let’s take a look. I hope it can help you.

Implementation ideas

The main means of pure CSS implementation is to use the simulation function of the label tag. The for attribute of label can be associated with a specific input element. Even if the input itself is not visible to the user, after there is a label corresponding to it, the user can directly replace the native input by interacting with the label label - and this gives us Style simulation leaves room. In short, it is

Hide the native input and leave the style definition process to the label (then why not directly change the style of the checkbox? Because checkbox is the default component of the browser, style changes are not as convenient as label, many Attributes have no effect on checkboxes, such as background, and label is basically the same as p in style. "The existence of " allows us to directly use the default checkbox of html, eliminating the trouble of js simulation selection.

<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>

.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;
}

I won’t go into details about the specific content of pseudo-elements here (in fact, my knowledge of them is limited to their use. I can’t even understand this, so I won’t mislead others)

/* 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;
}

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