网页Ajax Loading效果

2014-05-01 15:08:24 +0800

此代码仅供参考

代码说明

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。

html代码

<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();">

<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>


<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>

代码演示

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