Sharing examples of using CSS JavaScript or pure js to achieve semi-transparent mask effects

Sharing examples of using CSS JavaScript or pure js to achieve semi-transparent mask effects_javascript skills

WBOY

Release： 2016-05-16 09:00:28

Original

2147 people have browsed it

css javascript
implementation principle:
create a full-screen div, use absolute positioning, so that it can be separated from the document flow and will not affect other elements, and set it to a semi-transparent state. of course, this transparency can be adjusted at will, and create a login at the same time. element, it also uses absolute positioning and makes its z-index attribute value greater than the div on the screen. at this time, it will not be covered by the full-screen div. by default, the display attribute value of these two divs is none. their display attribute values can be changed when the corresponding buttons are clicked.

<!doctype html> 

<html> 

<head> 

<meta charset=" utf-8"> 

<meta name="author" content="/" /> 

<title>css如何实现弹出一个全屏灰黑色透明遮罩效果-脚本之家</title> 

<style type="text/css"> 

* 

{ 

 margin:0px; 

 padding:0px; 

} 

.zhezhao 

{ 

 width:100%; 

 height:100%; 

 background-color:#000; 

 filter:alpha(opacity=50); 

 -moz-opacity:0.5; 

 opacity:0.5; 

 position:absolute; 

 left:0px; 

 top:0px; 

 display:none; 

 z-index:1000; 

} 

.login 

{ 

 width:280px; 

 height:180px; 

 position:absolute; 

 top:200px; 

 left:50%; 

 background-color:#000; 

 margin-left:-140px; 

 display:none; 

 z-index:1500; 

} 

.content 

{ 

 margin-top:50px; 

 color:red; 

 line-height:200px; 

 height:200px; 

 text-align:center; 

} 

</style> 

<script type="text/javascript"> 

window.onload=function() 

{ 

 var zhezhao=document.getelementbyid("zhezhao"); 

 var login=document.getelementbyid("login"); 

 var bt=document.getelementbyid("bt"); 

 var btclose=document.getelementbyid("btclose"); 

 bt.onclick=function() 

 { 

 zhezhao.style.display="block"; 

 login.style.display="block"; 

 } 

 btclose.onclick=function() 

 { 

 zhezhao.style.display="none"; 

 login.style.display="none"; 

 } 

} 

</script> 

</head> 

<body> 

 <div class="zhezhao" id="zhezhao"></div> 

 <div class="login" id="login"><button id="btclose">点击关闭</button></div> 

 <div class="content">脚本之家欢迎您，<button id="bt">点击弹出遮罩</button></div> 

</body> 

</html>

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the above implements the basic mask function. when you click to pop up the mask, an object will pop up. when you click to close it, the mask effect disappears.

pure javascript:
achievement effect: when a window pops up, the page behind the window becomes dark and cannot be operated.

difficulty: because the div layer cannot cover the select control, it needs special treatment. there are two methods. one is to add a layer of iframe under the pop-up window to cover the select; the second is to add a layer of iframe under the pop-up window to cover the select control; , first hide the select control, and choose the second method here.

implementation principle: add a translucent layer between the page and the pop-up window to cover the content of the page.

code:

<script language="javascript"> 
function Open() 
{ 
 //隐藏select控件 
 DispalySelect(0); 
 //显示遮罩层 
 document.getElementById("divPageMask").style.display="block"; 
 //处理遮罩层 
 resizeMask(); 
 window.onResize = resizeMask; 
 //显示弹出窗口 
 document.getElementById("divOpenWin").style.display="block"; 
} 
function Close() 
{ 
 //显示select控件 
 DispalySelect(1); 
 //处理遮罩层 
 divPageMask.style.width = "0px"; 
 divPageMask.style.height = "0px"; 
 divOpenWin.style.display = "none"; 
 window.onResize = null; 
 
 document.getElementById("divOpenWin").style.display="none"; 
} 
//页面遮罩 
function resizeMask() 
{ 
 divPageMask.style.width = document.body.scrollWidth; 
 divPageMask.style.height = document.body.scrollHeight; 
 divOpenWin.style.left = ((document.body.offsetWidth - divOpenWin.offsetWidth) / 2); 
 divOpenWin.style.top = ((document.body.offsetHeight - divOpenWin.offsetHeight) / 2); 
} 
function DispalySelect(val) 
{ //显示和隐藏select控件 
 var dispalyType; 
 var arrdispalyType=["hidden","visible"]; 
 var arrObjSelect=document.getElementsByTagName("select"); 
 for (i=0;i<arrObjSelect.length;i++) 
 { 
 arrObjSelect[i].style.visibility=arrdispalyType[val]; 
 } 
} 
</script> 
 
<style type="text/css"> 
.body,td{font-size:12px} 
#divPageMask{background-color:white; filter:alpha(opacity=50);left:0px;position:absolute;top:0px;} 
#divOpenWin{background-color:#EEEEEE;position: absolute;left:0px;top:0px;display: none;z-index:50; width:300px;height:150px} 
</style> 
 
<div id="divPageMask"></div> 
<div id="divOpenWin"><center><a href="javascript:Close();">关闭</a></center></div> 
<label></label> 
<center> 
 <table border="0" cellpadding="0" cellspacing="0" width="650"> 
 <tbody> 
 <tr> 
 <td colspan="2" align="center" height="90"><p><img  src="http://www.sopull.com/Images/Index/logo.gif"    style="max-width:90%"  style="max-width:90%" alt="Sharing examples of using CSS JavaScript or pure js to achieve semi-transparent mask effects_javascript skills" ></p> 
 <p> </p> 
 <p> </p></td> 
 </tr> 
 <tr> 
 <td height="10" style="color:#666666;font-size:13px"> </td> 
 </tr> 
 </tbody> 
 </table> 
 <table bgcolor="#e1e1e1" border="0" cellpadding="0" cellspacing="1" height="85" width="650"> 
 <tbody> 
 <tr> 
 <td align="center" bgcolor="#f9f9f9"><table height=50 cellspacing=0 cellpadding=0 width=600 style="margin-top:20px"> 
 <FORM name="f" action="http://www.sopull.com/ShopList.asp"> 
 <tbody> 
 <tr> 
 <td class="searchbar_word">关键字：</td> 
 <td width="241"><input type="text" name="k" size=30 /></td> 
 <td align=middle width=101 class="searchbar_word">所在地：</td> 
 <td align=middle width=97 id="cn"><script language="javascript" src="http://www.sopull.com/Inc/Js/ListCity.asp?CityName=北京市"></script></td> 
 <td align=middle width=95><input name="s" type=submit value=" 搜 铺 "></td> 
 </tr> 
 </form> 
 <tr> 
 <td width="64" height="30"> </td> 
 <td colspan="4" valign="middle" class="search_text">例如：餐厅；电器；超市 
 </table></td> 
 </tr> 
 </tbody> 
 </table> 
</center> 
<p align="center"> </p> 
<p align="center"><a href="javascript:Open();">打开遮罩</a></p> 
<p align="center"> </p> 
<table width="650" border="0" align="center" cellpadding="0" cellspacing="0"> 
 <tbody> 
 <!-- <tr> 
 <td align="center" background="Images/Index/line_2.gif" width="580"><img  src="Images/Index/line_2.gif"    style="max-width:90%"  style="max-width:90%" alt="Sharing examples of using CSS JavaScript or pure js to achieve semi-transparent mask effects_javascript skills" ></td> 
 </tr>--> 
 <tr> 
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 </tr> 
 <tr> 
 <td align="center" height="30">©2007 搜铺网     粤ICP备07006767号</td> 
 </tr> 
 </tbody> 
</table>

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