jQuery clicks the button to pop up the mask layer and center the content with special effects

jQuery clicks the button to pop up the mask layer and center the content with special effects_jquery

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Release： 2016-05-16 15:25:59

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This article shares with you the jQuery special effect of clicking a button to pop up the mask layer and center the content. Let’s take a look at the final effect:

Since it is a test program, I did not add a close button.
1. Main program

<!DOCTYPE html>
<html>
 <head>
  <meta charset="utf-8" />
  <title>弹出居中遮罩</title>
  <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
  <link rel="stylesheet" type="text/css" href="css/layout.css"/>
 </head>
 <body>
  <section class="test">
   这里是主体内容<br />
  <input type="button" class="testButton" value="弹出遮罩" />
  </section>
  <section class="testBg">
   <section class="testCont">
    这里是弹出的内容测试
   </section>
  </section>
  <script src="js/jquery-1.11.0.js" type="text/javascript" charset="utf-8"></script>
  <script src="js/layout.js" type="text/javascript" charset="utf-8"></script>
 </body>
</html>

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2. CSS style

*{
 margin: 0;
 padding: 0;
}
.testBg{
 position: absolute;
 top: 0;
 background-color: #000;
 filter:alpha(opacity=80); /* IE */
 -moz-opacity:0.8; /* Moz + FF */
 opacity: 0.8; /* 支持CSS3的浏览器（FF 1.5也支持）*/
 display:none ;     
}
.testBg .testCont{
 position: absolute;
 top: 0;
 left: 0;
 width:200px;
 border: 1px #ffc700 solid;
 color: #ffc700;
}

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3. JS program
This is the focus of this essay. Let’s look at an incorrect JS program:

$(function(){
 $(".testBg").height($(window).height()).width($(window).width()); //使遮罩的背景覆盖整个页面
 var testContTop=($(window).height()-$(".testCont").height())/2;  //计算弹出的框距离页面顶部的距离
 var testContWidth=($(window).width()-$(".testCont").width())/2;   //计算弹出的框距离页面左边的距离
 $(".testCont").css({
  "top":testContTop,
  "left":testContWidth
 });
 $(".testButton").click(function(){
  $(".testBg").show();
 }) 
})

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The above program seems to be fine, so let’s take a look at the output:

The upper and lower spacing is inconsistent during actual measurement.

Then the correct JS program is:

$(function(){
 $(".testBg").height($(window).height()).width($(window).width());//使遮罩的背景覆盖整个页面
  
 $(".testButton").click(function(){
  $(".testBg").show();
  showDiv();
 }) 
})
function showDiv(){
   
 var testContTop=($(window).height()-$(".testCont").height())/2; //计算弹出的框距离页面顶部的距离
 var testContWidth=($(window).width()-$(".testCont").width())/2; //计算弹出的框距离页面左边的距离
 $(".testCont").css({
  "top":testContTop,
  "left":testContWidth
 });
}

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As can be seen from the above program, after the mask layer pops up, a function is executed to dynamically set the background size of the popup layer and the top and left spacing of the page, instead of setting the popup when JS is first loaded. layer parameters.

The above is the entire content of this article, teaching you how to achieve the effect of clicking a button to pop up the mask layer and center the content,