Home >Web Front-end >JS Tutorial >jquery implements loading progress bar prompt effect_jquery

jquery implements loading progress bar prompt effect_jquery

WBOY
WBOYOriginal
2016-05-16 15:30:331916browse

The example in this article describes the jquery code to implement the loading progress bar prompt effect. Share it with everyone for your reference. The details are as follows:
The screenshot of the running effect is as follows:

The specific code is as follows:

<!DOCTYPE html>
<html>

 <head>
  <meta charset="utf-8">
  <title>进度条</title>
  <script type="text/javascript" src="http://lib.sinaapp.com/js/jquery/1.4.1/jquery.min.js"></script>
 </head>

 <body>
  <div class="spinner"> </div> 
 </body>

</html>

css style:

body,div {
 padding: 0;
 margin: 0;
}
div.spinner {
 position: absolute;
 width: 160px;
 height: 160px;
 margin-left: 240px;
 margin-top: 350px;
}
div.loaderdot {
 position: absolute;
 width: 20px;
 height: 20px;
 border-radius: 50%;
 background-color: rgb(29, 140, 248);
}  1 window.onload = function() {

js code:

var total = 16,
   angle = 3 * Math.PI,
   Radius = 80,
   html = '';
  var spinnerL = parseInt($("div.spinner").css("margin-left"));
  var spinnerT = parseInt($("div.spinner").css("margin-top"));
  for (var i = 0; i < total; i++) {
   //对每个元素的位置和透明度进行初始化设置
   var loaderL = Radius + Radius * Math.sin(angle) - 10;
   var loaderT = Radius + Radius * Math.cos(angle) - 10;
   html += "<div class='loaderdot' style='left:" + loaderL + "px;top:" + loaderT + "px; opacity:" + i / (total - 1) + "'></div>";
   angle -= 2 * Math.PI / total;
 }
 $("div.spinner").empty().html(html);
 var lastLoaderdot = $("div.loaderdot").last();
 timer = setInterval(function() {
   $("div.loaderdot").each(function() {
     var self = $(this);
      var prev = self.prev().get(0) &#63; self.prev() : lastLoaderdot,
       opas = prev.css("opacity");
      self.animate({
      opacity: opas
     }, 50);
   });
 }, 60);
27}

I hope this article will be helpful to everyone learning jquery programming.

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn