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JS web page loading effect code based on Ajax_javascript skills

WBOY
WBOYOriginal
2016-05-16 15:34:491400browse

The example in this article describes the web page loading effect code implemented by JS based on Ajax. Share it with everyone for your reference, the details are as follows:

This is a very good web loading effect. It is often used in Ajax interactive web design. Click the button to pop up the Loading box. If the web page is closed when the Loading box is not loaded, a confirmation prompt box will pop up, which is useful for some Interactive processing of web pages that require high security performance, such as payment operations.

The screenshot of the running effect is as follows:

The online demo address is as follows:

http://demo.jb51.net/js/2015/js-ajax-web-loading-style-codes/

The specific code is as follows: 

<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&#63;";
}
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>

I hope this article will be helpful to everyone in JavaScript programming.

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