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我们经常在浏览网页的时候会看到数据在加载时,出现的LOADING提示。其实这个功能原理是很简单的,就是一个DIV遮盖当前页面,然后Loading就在遮盖DIV层上展示出来,现在我们来动手实现一下。
1.当前页面:
<div class="current"><a href="#" onclick="showLoading()">Loading</a></div>
2.遮罩层:
<div id="over" class="over"></div>
3.Loading展示层:
<div id="layout" class="layout"><img src="http://images.cnblogs.com/cnblogs_com/qiuyan/477435/o_31.gif" /></div>
整体代码:
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<style type="text/css">
.current a {
font-size: 20px;
}
.over {
display: none;
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: #f5f5f5;
opacity:0.5;
z-index: 1000;
}
.layout {
display: none;
position: absolute;
top: 40%;
left: 40%;
width: 20%;
height: 20%;
z-index: 1001;
text-align:center;
}
</style>
<script type="text/javascript">
function showLoading()
{
document.getElementById("over").style.display = "block";
document.getElementById("layout").style.display = "block";
}
</script>
</head>
<body>
<div class="current"><a href="#" onclick="showLoading()">Loading</a></div>
<div id="over" class="over"></div>
<div id="layout" class="layout"><img src="http://images.cnblogs.com/cnblogs_com/qiuyan/477435/o_31.gif" /></div>
</body>
</html>
1 <!DOCTYPE html> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <title></title> 5 <style type="text/css"> 6 .current a { 7 font-size: 20px; 8 } 9 10 .over { 11 display: none; 12 position: absolute; 13 top: 0; 14 left: 0; 15 width: 100%; 16 height: 100%; 17 background-color: #f5f5f5; 18 opacity:0.5; 19 z-index: 1000; 20 } 21 22 .layout { 23 display: none; 24 position: absolute; 25 top: 40%; 26 left: 40%; 27 width: 20%; 28 height: 20%; 29 z-index: 1001; 30 text-align:center; 31 } 32 </style> 33 <script type="text/javascript"> 34 function showLoading() 35 { 36 document.getElementById("over").style.display = "block"; 37 document.getElementById("layout").style.display = "block"; 38 } 39 </script> 40 </head> 41 <body> 42 <div class="current"><a href="#" onclick="showLoading()">Loading</a></div> 43 <div id="over" class="over"></div> 44 <div id="layout" class="layout"><img src="http://images.cnblogs.com/cnblogs_com/qiuyan/477435/o_31.gif" /></div> 45 </body> 46 </html>
最终效果:
在网上还看到另外一种实现方式,感觉思路不错,就是利用JS不断的改变html标签的value值,达到加载提示的效果,根据他的思路我自己实现了下,代码如下:
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<!-- <script src="Scripts/jquery-1.8.2.js"></script>-->
<style type="text/css">
#tb {
width: 100%;
height: 100%;
line-height: 10px;
}
#tb tr td {
text-align: center;
}
.progressbar {
font-family: Arial;
font-weight: bolder;
color: gray;
background-color: white;
padding: 0px;
border-style: none;
}
.percent {
font-family: Arial;
color: gray;
text-align: center;
border-width: medium;
border-style: none;
}
</style>
<script type="text/javascript">
var bar = 0;
var step = "||";
/*
*第一种方式即 :$(document).ready(function(){.....});
*/
//$(function () {
// progress();
//});
/*
*第二种方式
*/
//window.onload = function () {
// progress();
//}
/*
*第三种方式模拟 $(document).ready(function(){.....});
*/
(function () {
var ie = !!(window.attachEvent && !window.opera);
var wk = /webkit\/(\d+)/i.test(navigator.userAgent) && (RegExp.$1 < 525);
var fn = [];
var run = function () { for (var i = 0; i < fn.length; i++) fn[i](); };
var d = document;
d.ready = function (f) {
if (!ie && !wk && d.addEventListener)
return d.addEventListener(‘DOMContentLoaded‘, f, false);
if (fn.push(f) > 1) return;
if (ie)
(function () {
try { d.documentElement.doScroll(‘left‘); run(); }
catch (err) { setTimeout(arguments.callee, 0); }
})();
else if (wk)
var t = setInterval(function () {
if (/^(loaded|complete)$/.test(d.readyState))
clearInterval(t), run();
}, 0);
};
})();
document.ready(function () {
progress();
});
function progress() {
bar = bar + 2;
step = step + "||";
document.getElementById("percent").value = bar + "%";
document.getElementById("progressbar").value = step;
if (bar <= 98) {
setTimeout("progress()", 100);
}
}
</script>
</head>
<body>
<table id="tb">
<tr>
<td>
<input type="text" size="50" class="percent" id="percent" /></td>
</tr>
<tr>
<td>
<input type="text" size="50" class="progressbar" id="progressbar" /></td>
</tr>
</table>
</body>
</html>
1 <!DOCTYPE html> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <title></title> 5 <!-- <script src="Scripts/jquery-1.8.2.js"></script>--> 6 <style type="text/css"> 7 #tb { 8 width: 100%; 9 height: 100%; 10 line-height: 10px; 11 } 12 13 #tb tr td { 14 text-align: center; 15 } 16 17 .progressbar { 18 font-family: Arial; 19 font-weight: bolder; 20 color: gray; 21 background-color: white; 22 padding: 0px; 23 border-style: none; 24 } 25 26 .percent { 27 font-family: Arial; 28 color: gray; 29 text-align: center; 30 border-width: medium; 31 border-style: none; 32 } 33 </style> 34 <script type="text/javascript"> 35 var bar = 0; 36 var step = "||"; 37 /* 38 *第一种方式即 :$(document).ready(function(){.....}); 39 */ 40 //$(function () { 41 // progress(); 42 //}); 43 44 /* 45 *第二种方式 46 */ 47 //window.onload = function () { 48 // progress(); 49 //} 50 51 /* 52 *第三种方式模拟 $(document).ready(function(){.....}); 53 */ 54 (function () { 55 var ie = !!(window.attachEvent && !window.opera); 56 var wk = /webkit\/(\d+)/i.test(navigator.userAgent) && (RegExp.$1 < 525); 57 var fn = []; 58 var run = function () { for (var i = 0; i < fn.length; i++) fn[i](); }; 59 var d = document; 60 d.ready = function (f) { 61 if (!ie && !wk && d.addEventListener) 62 return d.addEventListener(‘DOMContentLoaded‘, f, false); 63 if (fn.push(f) > 1) return; 64 if (ie) 65 (function () { 66 try { d.documentElement.doScroll(‘left‘); run(); } 67 catch (err) { setTimeout(arguments.callee, 0); } 68 })(); 69 else if (wk) 70 var t = setInterval(function () { 71 if (/^(loaded|complete)$/.test(d.readyState)) 72 clearInterval(t), run(); 73 }, 0); 74 }; 75 })(); 76 77 document.ready(function () { 78 79 progress(); 80 81 }); 82 83 84 function progress() { 85 bar = bar + 2; 86 step = step + "||"; 87 document.getElementById("percent").value = bar + "%"; 88 document.getElementById("progressbar").value = step; 89 if (bar <= 98) { 90 setTimeout("progress()", 100); 91 } 92 } 93 </script> 94 </head> 95 <body> 96 <table id="tb"> 97 <tr> 98 <td> 99 <input type="text" size="50" class="percent" id="percent" /></td> 100 </tr> 101 <tr> 102 <td> 103 <input type="text" size="50" class="progressbar" id="progressbar" /></td> 104 </tr> 105 </table> 106 </body> 107 </html>
最终效果:
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原文地址:http://www.cnblogs.com/mili3/p/4334483.html