Clear float css Method Summary

Clear float in fact the main problem to solve is the height of collapse, specifically not discussed here ~ ~ ~ those years we had together to clear the floating (Gangster blog, written in very good)

Methods Summary: 1.

1) add additional tags

This is the school teacher told us one way, by adding an empty tag at the end of the floating elements such as <div style = "clear: both"> </ div>, other labels, etc. can also br.

<div class="main left">.main{float:left;}</div>
<div class="side left">.side{float:right;}</div>
<div style="clear:both;"></div>
</div>
<div class="footer">.footer</div>

Advantages: easy to understand, easy to grasp

Disadvantages: This method can imagine, how much would be meaningless empty label to add, contrary to the structure and performance of separation, in later maintenance will be a nightmare, it is determined not to be tolerated, it is recommended that after you read this article Do not use it.

2) the parent element disposed overflow: hidden

By setting the value of the parent element to overflow hidden; in IE6 required to trigger hasLayout, e.g. zoom: 1;

<div class="wrap" id="float3" style="overflow:hidden; *zoom:1;">
<h2>3)父元素设置 overflow </h2>
<div class="main left">.main{float:left;}</div>
<div class="side left">.side{float:right;}</div>
</div>
<div class="footer">.footer</div>

Advantages: the absence of structural and semantic problems, a very small amount of code

Disadvantages: increased content when likely to cause not wrap causes the contents to be hidden away, can not display elements need to overflow; 2004 POPO discovered overflow: hidden will result in bond failure , this is me as a multi-tabbed browsing control unacceptable of. We still do not use.

3) Floating parent element is also provided

Advantages: the absence of structural and semantic problems, a very small amount of code

Disadvantages: makes the layout of the parent element adjacent elements will be affected, not always float to the body, not recommended

Several methods above have a variety of problems, the following method is recommended:

4) Use: after pseudo-element

Note that: after pseudo-elements is ( Pseudo-Element ), not the pseudo-classes (which some CSS manual called "pseudo-object").

Since IE6-7 does not support: after, use zoom: 1 trigger hasLayout.

This method is derived from: How the To the Clear Floats Without Structural Markup

All original code is as follows:

<style type="text/css">
 .clearfix:after {  content: "."; display: block; height: 0; clear: both; visibility: hidden;  }  
.clearfix {display: inline-block;}  /* for IE/Mac */  
</style>
<!--[if IE]>
 <style type="text/css">
 .clearfix {zoom: 1;/* triggers hasLayout */  Run the display : Block ; / * the RESETS Run the display for IE / Win * / } </ style> 
  - <[endif]!> 
 Given the IE / Mac's market share is very low, we ignore the direct, streamlined final code is as follows: 
 . clearfix: After { Content : "." ; the display : Block ; height : 0 ; visibility : hidden ; Clear : both ;} 
.clearfix { * Zoom : . 1 ;}

Can be avoided by increasing before the top of the browser to crash, we use a method recommended!

　supplement:

.clearfix:after {content:"."; display:block; height:0; visibility:hidden; clear:both; }
.clearfix { *zoom:1; }

1) display:block 使生成的元素以块级元素显示,占满剩余空间;

2) height:0 避免生成内容破坏原有布局的高度。

3) visibility:hidden 使生成的内容不可见，并允许可能被生成内容盖住的内容可以进行点击和交互;

4）通过 content:"."生成内容作为最后一个元素，至于content里面是点还是其他都是可以的，例如oocss里面就有经典的 content:"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",有些版本可能content 里面内容为空,一丝冰凉是不推荐这样做的,firefox直到7.0 content:”" 仍然会产生额外的空隙；

5）zoom：1 触发IE hasLayout。

通过分析发现，除了clear：both用来闭合浮动的，其他代码无非都是为了隐藏掉content生成的内容，这也就是其他版本的闭合浮动为什么会有font-size：0，line-height：0。

本文来自:https://www.cnblogs.com/jianghao233/p/7773879.html

方法小结：1.

1）添加额外标签

这是在学校老师就告诉我们的一种方法，通过在浮动元素末尾添加一个空的标签例如 <div style=”clear:both”></div>，其他标签br等亦可。

<div class="main left">.main{float:left;}</div>
<div class="side left">.side{float:right;}</div>
<div style="clear:both;"></div>
</div>
<div class="footer">.footer</div>

优点：通俗易懂，容易掌握

缺点：可以想象通过此方法，会添加多少无意义的空标签，有违结构与表现的分离，在后期维护中将是噩梦，这是坚决不能忍受的，所以你看了这篇文章之后还是建议不要用了吧。

2)父元素设置 overflow：hidden

通过设置父元素overflow值设置为hidden；在IE6中还需要触发 hasLayout ，例如 zoom：1；

<div class="wrap" id="float3" style="overflow:hidden; *zoom:1;">
<h2>3)父元素设置 overflow </h2>
<div class="main left">.main{float:left;}</div>
<div class="side left">.side{float:right;}</div>
</div>
<div class="footer">.footer</div>

优点：不存在结构和语义化问题，代码量极少

缺点：内容增多时候容易造成不会自动换行导致内容被隐藏掉，无法显示需要溢出的元素；04年POPO就发现overflow:hidden会导致中键失效，这是我作为一个多标签浏览控所不能接受的。所以还是不要使用.

3）父元素也设置浮动

优点：不存在结构和语义化问题，代码量极少

缺点：使得与父元素相邻的元素的布局会受到影响，不可能一直浮动到body，不推荐使用

上面的几种方法都有各种各样的问题，下面的推荐方法：

4）使用:after 伪元素

需要注意的是 :after是伪元素（Pseudo-Element），不是伪类（某些CSS手册里面称之为“伪对象”）.

由于IE6-7不支持:after，使用 zoom:1触发 hasLayout。

该方法源自于: How To Clear Floats Without Structural Markup

原文全部代码如下:

<style type="text/css">
 .clearfix:after {  content: "."; display: block; height: 0; clear: both; visibility: hidden;  }  
.clearfix {display: inline-block;}  /* for IE/Mac */  
</style>
<!--[if IE]>
 <style type="text/css">
 .clearfix {zoom: 1;/* triggers hasLayout */  display: block;/* resets display for IE/Win */} </style>
  <![endif]-->
 鉴于 IE/Mac的市场占有率极低,我们直接忽略掉,最后精简的代码如下:
 .clearfix:after {content:"."; display:block; height:0; visibility:hidden; clear:both; }
.clearfix { *zoom:1; }

或者

通过增加before即可避免浏览器顶部崩溃，是一种推荐大家使用的方法！

　补充：

.clearfix:after {content:"."; display:block; height:0; visibility:hidden; clear:both; }
.clearfix { *zoom:1; }

1) display:block 使生成的元素以块级元素显示,占满剩余空间;

2) height:0 避免生成内容破坏原有布局的高度。

3) visibility:hidden 使生成的内容不可见，并允许可能被生成内容盖住的内容可以进行点击和交互;

5）zoom：1 触发IE hasLayout。

The analysis revealed that, in addition to clear: both used to close the floating, other code is nothing but to hide the contents out of content generation, which is another version of why there is a closed floating font-size: 0, line-height: 0.

This article comes from: https://www.cnblogs.com/jianghao233/p/7773879.html

Clear float css Method Summary

Guess you like