一个非常不错的loading 效果.借花献佛.
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</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();
// Add a resize handler for the window
window.onresize = resizeModal;
// Add a warning in case anyone tries to navigate away or refresh the page
window.onbeforeunload = showWarning;
//
// Here's where you would normally kick off a long asynchronous process
// like a file download or a remote database operation. Here, we use
// our "long process" to simulate this process.
//
continueLongProcess();
}
function updateProgress(nNewPercent)
{
// Update our pseudo progress bar
divProgressInner.style.width = (parseInt(divProgressOuter.style.width)
* nNewPercent / 100)+ "px";
}
function stopLongProcess()
{
if (g_oTimer != null)
{
// Clear the timer so we don't get called back an extra time
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)
{
// Set the timeout somewhere between 0 and .25 seconds
var nTimeoutLength = Math.random() * 250;
updateProgress(100 * nRepetitions / NUMBER_OF_REPETITIONS);
g_oTimer = window.setTimeout("continueLongProcess();", nTimeoutLength);
nRepetitions++;
}
else
{
stopLongProcess();
}
}
function showWarning()
{
//Warn users before they refresh the page or navigate away
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()
{
// Resize the DIV which fakes the modality of the dialog DIV
divModal.style.width = document.body.scrollWidth;
divModal.style.height = document.body.scrollHeight;
// Re-center the dialog DIV
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">
Downloading Requested Document
</DIV>
<DIV STYLE="PADDING: 5px">
Please wait while I download the document you requested.
</DIV>
<DIV STYLE="PADDING: 5px">
This may take several seconds.
</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="Cancel">
</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>
