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HomeWeb Front-endHTML TutorialFlexible box model layout box-flex_html/css_WEB-ITnose in css3

box-flex:也就是让子容器针对父容器的宽高属性按照一定的规则来划分

Eg:

html代码:

01

02

03

CSS样式:

body,div { background:#fff; margin:0; padding:0;}

.wrap { width:600px; height:200px; color:#fff; margin:20px 0 0 20px; text-align:center; 

display:-moz-box; display:-webkit-box; display:box;   

-moz-box-orient:block-axis; -webkit-box-orient:block-axis; box-orient:block-axis;    

-moz-box-direction:reverse; -webkit-box-direction:reverse; box-direction:reverse;    

}

.box1 {background:red;

  -moz-box-flex:3; -webkit-box-flex:3; box-flex:3;    

  -moz-box-ordinal-group:1; -webkit-box-ordinal-group:1; box-ordinal-group:1;   

  }

.box2 {background:green;

 -moz-box-flex:1; -webkit-box-flex:1; box-flex:1;

 -moz-box-ordinal-group:3; -webkit-box-ordinal-group:3; box-ordinal-group:3; 

  }

.box3 {background:blue;

 -moz-box-flex:2; -webkit-box-flex:2; box-flex:2;

 -moz-box-ordinal-group:2; -webkit-box-ordinal-group:2; box-ordinal-group:2; 

   }

预览效果:

 

解析:

先看父级元素中设置的属性

1、box-orient:block-axis;      使得子元素按照块级类型竖向显示;

2、box-direction:reverse;      使得子元素显示顺序与默认相颠倒;

再看子元素中的属性(这个以红色区域且标有01文字的模块为例来做详细介绍)

1、box-flex:3;  子元素依照无级元素设置了占有比例。从全局来看,一共将低级元素划分成了6份,而红色区域是占了3/6的,即上图中显示所整体高度的1/2;

2、box-ordinal-group:1;   即给每一个子元素定义了一个组,则按照组的大小来呈现,先小后大;  按照组中定义的大小,本应该是红色居上、蓝色居中、绿色最下显示,而在父级元素中定义了一个子元素的反向呈现方式(box-direction:reverse),即与默认相反;

说到这里,我想大家都豁然开朗了吧!呵呵,当然也存在疑问,如果想让其中某一模块设置为固定数字,那么其他模块又会按怎样的比例来呈现呢?我们可以再看一下下面这个例子(由例1稍做改动)。

静态代码不变、样式由之前的改为:

body,div { background:#fff; margin:0; padding:0;}

.wrap { width:600px; height:200px; color:#fff; margin:20px 0 0 20px; text-align:center; 

display:-moz-box; display:-webkit-box; display:box;   

-moz-box-orient:block-axis; -webkit-box-orient:block-axis; box-orient:block-axis;    

-moz-box-direction:reverse; -webkit-box-direction:reverse; box-direction:reverse;    

}

.box1 {background:red;

  -moz-box-flex:3; -webkit-box-flex:3; box-flex:3;    

  -moz-box-ordinal-group:1; -webkit-box-ordinal-group:1; box-ordinal-group:1;   

  }

.box2 {background:green;

   height:100px; 

 -moz-box-ordinal-group:3; -webkit-box-ordinal-group:3; box-ordinal-group:3; 

  }

.box3 {background:blue;

 -moz-box-flex:2; -webkit-box-flex:2; box-flex:2;

 -moz-box-ordinal-group:2; -webkit-box-ordinal-group:2; box-ordinal-group:2; 

   }

预览效果:

 

这个时候,绿色模块的高度是固定的,设置为100,占据了父元素的一半。从预览图可以看出,不管哪个模块,一旦设置了固定的宽或者是高,则优先级会比较高。而其他模块呢,还是按照之前的那种思路,用相应比例来显示。要注意的是,这时候的总宽或者高就变了,应

 

 

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