JS基于Ajax实现的网页Loading效果代码

前端技术 2023/09/06 JavaScript

本文实例讲述了JS基于Ajax实现的网页Loading效果代码。分享给大家供大家参考，具体如下：

这是一款很不错的网页Loading效果，常用于Ajax交互式网页设计中，点击按钮即可弹出Loading框，若Loading框未加载完成时关闭网页，会弹出确认提示框，用于一些对安全性能要求高的网页交互处理中，比如付款操作。

运行效果截图如下：

在线演示地址如下：

http://demo.phpstudy.net/js/2015/js-ajax-web-loading-style-codes/

具体代码如下：

<html>
<head>
<meta http-equiv=\"Content-Type\" content=\"text/html; charset=gb2312\">
<title>很不错的网页Ajax Loading效果</title>
</head>
<BODY STYLE=\"FONT-SIZE: 10pt; FONT-FAMILY: Verdana, Arial, Helvetica\">
<SCRIPT LANGUAGE=\"JScript\">
var NUMBER_OF_REPETITIONS = 40;
var nRepetitions = 0;
var g_oTimer = null;
function startLongProcess()
{
  divProgressDialog.style.display = \"\";
  resizeModal();
  btnCancel.focus();
  window.onresize = resizeModal;
  window.onbeforeunload = showWarning;
  continueLongProcess();
}
function updateProgress(nNewPercent)
{
  divProgressInner.style.width = (parseInt(divProgressOuter.style.width)
   * nNewPercent / 100)+ \"px\";
}
function stopLongProcess()
{
  if (g_oTimer != null)
  {
   window.clearTimeout(g_oTimer);
   g_oTimer = null;
  }
  // Hide the fake modal DIV
  divModal.style.width = \"0px\";
  divModal.style.height = \"0px\";
  divProgressDialog.style.display = \"none\";
  // Remove our event handlers
  window.onresize = null;
  window.onbeforeunload = null;
  nRepetitions = 0;
}
function continueLongProcess()
{
  if (nRepetitions < NUMBER_OF_REPETITIONS)
  {
   var nTimeoutLength = Math.random() * 250;
   updateProgress(100 * nRepetitions / NUMBER_OF_REPETITIONS);
   g_oTimer = window.setTimeout(\"continueLongProcess();\", nTimeoutLength);
   nRepetitions++;
  }
  else
  {
   stopLongProcess();
  }
}
function showWarning()
{
  return \"Navigating to a different page or refreshing the window could cause you to lose precious data.\\n\\nAre you*absolutely* certain you want to do this?\";
}
function resizeModal()
{
  divModal.style.width = document.body.scrollWidth;
  divModal.style.height = document.body.scrollHeight;
  divProgressDialog.style.left = ((document.body.offsetWidth -
divProgressDialog.offsetWidth) / 2);
  divProgressDialog.style.top = ((document.body.offsetHeight -
divProgressDialog.offsetHeight) / 2);
}
</SCRIPT>
<INPUT TYPE=\"BUTTON\" VALUE=\"Click Me!\" onclick=\"startLongProcess();\">
<!-- BEGIN PROGRESS DIALOG -->
<DIV STYLE=\"BORDER: buttonhighlight 2px outset; FONT-SIZE: 8pt; Z-INDEX:
4; FONT-FAMILY: Tahoma; POSITION: absolute; BACKGROUND-COLOR: buttonface;
DISPLAY: none; WIDTH: 350px; CURSOR: default\" ID=\"divProgressDialog\"
onselectstart=\"window.event.returnValue=false;\">
  <DIV STYLE=\"PADDING: 3px; FONT-WEIGHT: bolder; COLOR: captiontext;
BORDER-BOTTOM: white 2px groove; BACKGROUND-COLOR: activecaption\">
   加载中……  </DIV>
  <DIV STYLE=\"PADDING: 5px\">
   请稍等，网页正在处理中……
  </DIV>
  <DIV STYLE=\"PADDING: 5px\">
   可能需要数秒钟.
  </DIV>
  <DIV STYLE=\"PADDING: 5px\">
     <DIV ID=\"divProgressOuter\" STYLE=\"BORDER: 1px solid threedshadow;
WIDTH: 336px; HEIGHT: 15px\">
      <DIV ID=\"divProgressInner\" STYLE=\"COLOR: white; TEXT-ALIGN:
center; BACKGROUND-COLOR: infobackground; MARGIN: 0px; WIDTH: 0px; HEIGHT:
13px;\"></DIV>
     </DIV>
  </DIV>
  <DIV STYLE=\"BORDER-TOP: white 2px groove; PADDING-BOTTOM: 5px; PADDING-TOP: 3px;
BACKGROUND-COLOR: buttonface; TEXT-ALIGN: center\">
     <INPUT STYLE=\"FONT-FAMILY: Tahoma; FONT-SIZE: 8pt\" TYPE=\"button\"
ID=\"btnCancel\" onclick=\"stopLongProcess();\" VALUE=\"取消\">
  </DIV>
</DIV>
<!-- END PROGRESS DIALOG -->
<!-- BEGIN FAKE MODAL DIV-->
<DIV ID=\"divModal\"
  STYLE=\"BACKGROUND-COLOR: white; FILTER: alpha(opacity=75); LEFT: 0px; POSITION:
 absolute; TOP: 0px; Z-INDEX: 3\"
  onclick=\"window.event.cancelBubble=true; window.event.returnValue=false;\">
</DIV>
<!-- END FAKE MODAL DIV -->
</body>
</html>

希望本文所述对大家JavaScript程序设计有所帮助。

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