Finding out load of background image
Marcus Bristav <[email protected]> Sat, 14 Apr 2007 07:58:53 +0200
| Newsgroups | gmane.comp.web.dom.wdf |
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| Message-ID | <[email protected]> |
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We're doing an application running on potentially slow devices.
Sometimes we need to show plates with text on top of it. The plates
usually have a image background specified by css. A problem we have when
running on Opera is that when we show one of these plates is that the
load, unpacking and rendering of the background image takes longer time
than calculating and showing the DOM that is on top of the image => ugly
since text is drawn before the background. This is no problem when the
image is cached. We have tried to pre-load. The problem is that it's a
big application, and not that much memory, so images sometimes are
kicked out of the cache anyway.
We have also tried to render the image with explicit <img> and have a
listener on the onload event. The problem here is that the onload seems
to kick in when the image is loaded from the server rather than when
it's unpacked and rendered.
Anyone have any good ideas how to solve this in an elegant way without
using timeouts? Whether the solution uses css background images or <img>
tags doesn't matter.
We've been working on this on and off for almost half a year now so
anything that might help will make you a hero ;)
/Marcus
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<p>We're doing an application running on potentially slow devices.<br>
<br>
Sometimes we need to show plates with text on top of it. The plates <br>
usually have a image background specified by css. A problem we have when <br>
running on Opera is that when we show one of these plates is that the <br>
load, unpacking and rendering of the background image takes longer time <br>
than calculating and showing the DOM that is on top of the image => ugly <br>
since text is drawn before the background. This is no problem when the <br>
image is cached. We have tried to pre-load. The problem is that it's a <br>
big application, and not that much memory, so images sometimes are <br>
kicked out of the cache anyway.<br>
<br>
We have also tried to render the image with explicit <img> and have a <br>
listener on the onload event. The problem here is that the onload seems <br>
to kick in when the image is loaded from the server rather than when <br>
it's unpacked and rendered.<br>
<br>
Anyone have any good ideas how to solve this in an elegant way without <br>
using timeouts? Whether the solution uses css background images or <img> <br>
tags doesn't matter.<br>
<br>
We've been working on this on and off for almost half a year now so <br>
anything that might help will make you a hero ;)<br>
<br>
/Marcus<br>
</p>
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