how to defer the redraw of the img or the document

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Charlie Hoo - 31 Jan 2006 21:09 GMT

Hello,

I am working on a html page as simple as following:

<html><head><title>test</title>
<script language="javascript">
function doZoom()
{
var zoom=parseInt(oImg.style.zoom) + z;
oImg.style.zoom = zoom + "%";
document.body.scrollLeft += 10;
document.body.scrollTop +=10;
}
</script>
</head>
<body STYLE="OVERFLOW:hidden;padding:0px;margin:0px;">
<table id="oTable" width=100% height=100% cellpadding=0
cellspacing=0><tr><td align=center valign=middle>
<img id=oImg onmousedown="doZoom();" style="zoom:100%">
</td>
</tr>
</table>
</body>
</html>

It works fine except that the screen will flick as it first do the zooming,
then it move to the left by 10px. How to make the function flickless? In
other words, how to make the document to update the screen only once instead
multiple times?

Thanks a lot.

Charlie

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Kevin Yu [MSFT] - 01 Feb 2006 06:21 GMT

Hi Charlie,

Do you mean that the image on the page is flashing or flicking? I tried
with a small jpg file (96*96) on my machine, and it works fine. If the
picture is too big, it will be flicking because of the performance. It is a
behavior by IE. AFAIK, We can do nothing to prevent this from happening.

Kevin Yu

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Charlie Hoo - 01 Feb 2006 13:47 GMT

Hello, Kevin,

You need to have jpg file larger than your IE window size to see the
flicking. I use a jpg file(1280x960) for the test. In MFC application, I can
defer the update(redrawing) of the interface until I want to, I wonder if it
is possible to do that with DHTML for IE document?

Thanks a lot.

Charlie

> Hi Charlie,
>
[quoted text clipped - 8 lines]
> "This posting is provided "AS IS" with no warranties, and confers no
> rights."

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Kevin Yu [MSFT] - 02 Feb 2006 04:16 GMT

Hi Charilie,

I have reproduced this on my machine with a larger picture. But
unfortunately, AFAIK, there is nothing we can do on this, because all of
them are handled by IE, unlike in MFC windows form apps.

Kevin Yu

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how to defer the redraw of the img or the document

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