【前端】-全屏遮罩 - MR.Huangjw

WBOY
Release: 2016-05-20 13:48:50
Original
1006 people have browsed it

前端开发中,很多时候一个弹出层的显示都会伴随着一个遮罩层的显示。

<span style="color: #008080;"> 1</span> <span style="color: #0000ff;"><span style="color: #ff00ff;">DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
</span><span style="color: #008080;"> 2</span> <span style="color: #ff00ff;">"http://www.w3.org/TR/html4/loose.dtd"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 3</span> <span style="color: #0000ff;"><span style="color: #800000;">html </span><span style="color: #ff0000;">xmlns</span><span style="color: #0000ff;">="http://www.w3.org/1999/xhtml"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 4</span>     <span style="color: #0000ff;"><span style="color: #800000;">head</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 5</span>         <span style="color: #0000ff;"><span style="color: #800000;">meta </span><span style="color: #ff0000;">http-equiv</span><span style="color: #0000ff;">="Content-Type"</span><span style="color: #ff0000;"> content</span><span style="color: #0000ff;">="text/html; charset=utf-8"</span> <span style="color: #0000ff;">/></span>
<span style="color: #008080;"> 6</span>         <span style="color: #0000ff;"><span style="color: #800000;">title</span><span style="color: #0000ff;">></span>全屏遮罩<span style="color: #0000ff;"></span><span style="color: #800000;">title</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 8</span>     <span style="color: #0000ff;"></span><span style="color: #800000;">head</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 9</span>     
<span style="color: #008080;">10</span>     <span style="color: #0000ff;"><span style="color: #800000;">body</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">11</span>         <span style="color: #0000ff;"><span style="color: #800000;">style</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">12</span> <span style="background-color: #f5f5f5; color: #800000;">            .float-bg </span><span style="background-color: #f5f5f5; color: #000000;">{</span>
<span style="color: #008080;">13</span> <span style="background-color: #f5f5f5; color: #ff0000;">                width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 100%</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">14</span> <span style="background-color: #f5f5f5; color: #ff0000;">                height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 100%</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">15</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-color</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> #000</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">16</span> <span style="background-color: #f5f5f5; color: #ff0000;">                opacity</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> .6</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">17</span> <span style="background-color: #f5f5f5; color: #ff0000;">                filter</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> alpha(opacity=60)</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">18</span> <span style="background-color: #f5f5f5; color: #ff0000;">                position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> absolute</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">19</span> <span style="background-color: #f5f5f5; color: #ff0000;">                left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 0</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">20</span> <span style="background-color: #f5f5f5; color: #ff0000;">                top</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 0</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">21</span> <span style="background-color: #f5f5f5; color: #ff0000;">                z-index</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 1100</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">22</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>
<span style="color: #008080;">23</span>         <span style="color: #0000ff;"></span><span style="color: #800000;">style</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">24</span>         <span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="float-bg"</span><span style="color: #ff0000;"> id</span><span style="color: #0000ff;">="float-bg"</span><span style="color: #0000ff;">></span> <span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">25</span>     <span style="color: #0000ff;"></span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">26</span> <span style="color: #0000ff;"></span><span style="color: #800000;">html</span><span style="color: #0000ff;">></span></span></span></span></span></span></span></span></span>
Copy after login

以上代码是一个遮罩层的简易演示代码。

在页面没有滚动条的情况下都能满足要求。但是当页面有滚动条时,你就会发现,以上的处理方式并不能满足全屏遮罩。

下面就通过结合javascript的方式,实现页面包含滚动条时的全屏遮罩。

这里将会用到上一篇文章中的两个方法:scrollWidth,scrollHeight。相关处理方式如下:

<span style="color: #008080;">1</span> <span style="color: #000000;">var floatBg = document.getElementById("float-bg");
</span><span style="color: #008080;">2</span> floatBg.style.width= document.body.scrollWidth + "px";<br>  floatBg.style.height = document.body.scrollHeight + "px"; 
Copy after login

这样处理,不管页面是否包含滚动条,都能实现全屏遮罩了。

 

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