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Old 12-26-2012, 04:42 PM   #1
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Center object vertically on page

I may be making something more difficult than it should be.

I wish to center an object vertically on it's own page. Is there a simple way of doing this?

Perhaps someone could point me to a css statement!
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Old 12-26-2012, 05:15 PM   #2
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I may be making something more difficult than it should be.

I wish to center an object vertically on it's own page. Is there a simple way of doing this?

Perhaps someone could point me to a css statement!
Own 'screen' or own file?
When it comes to Images, the problem is screens come in 3 sizes: to short, too long, just right . If you have a 800x600 screen and a 800x600 image (which is slight too big), then you try and display on a smaller screen?

Have not tried:
set the (Image) height: 80%; margin-top: 5%; margin-bottom: 5%
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Old 12-27-2012, 02:04 AM   #3
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It won't work. There no way (that I know of) to vertically centre something on a page.
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Old 12-27-2012, 03:46 AM   #4
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Only if you get "height: 100%" to be interpreted as the full screen height (minus margins). This is not clearly possible according to the spec (it's ambiguous at least), but some implementations might do that in some cases. Then, you can have a container with "height: 100%" (<body>, <div> or <svg>) and the image centered there, but it won't work everywhere.
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Old 12-27-2012, 03:48 AM   #5
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Only if you get "height: 100%" to be interpreted as the full screen height (minus margins). This is not clearly possible according to the spec (it's ambiguous at least), but some implementations might do that in some cases. Then, you can have a container with "height: 100%" (<body>, <div> or <svg>) and the image centered there, but it won't work everywhere.
It doesn't work with ADE, unfortunately, and that's what the overwhelming majority of ePub eInk devices use.
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Old 12-27-2012, 04:07 AM   #6
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It doesn't work with ADE, unfortunately, and that's what the overwhelming majority of ePub eInk devices use.
Precisely with ADE it works somehow, at least it seems to work (in my Orizon) with my covers and in the ePub Reader Test, but I didn't test it thoroughly.
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Old 12-27-2012, 04:14 AM   #7
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Precisely with ADE it works somehow, at least it seems to work (in my Orizon) with my covers and in the ePub Reader Test, but I didn't test it thoroughly.
It didn't work when I last tried it on my Sony PRS-350. Perhaps that's running an old version of ADE? The important point, though, is that it really can't be relied on to work.
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Old 12-28-2012, 09:37 AM   #8
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Have you tried this?

http://www.w3.org/Style/Examples/007/center.en.html
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Old 12-28-2012, 12:52 PM   #9
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I'll give it a try and report back.
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Old 12-28-2012, 01:53 PM   #10
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It still relies on setting a height for the container: "min-height: 10em;" or whatever.
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Old 12-28-2012, 02:16 PM   #11
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I wonder what it would do with min-height:100% or to a value greater than the physical reader page?

The "separate example" linked to from the page has code of:

div.container {top: 0; left: 0; width: 100%; height: 100%; position: absolute; display: table}
p {display: table-cell; vertical-align: middle}

but I don't if all this is supported by eReaders.

Last edited by Agama; 12-28-2012 at 02:22 PM.
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Old 12-28-2012, 02:28 PM   #12
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As discussed above and elsewhere, "height: 100%" is often ambiguous.
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Old 12-28-2012, 03:00 PM   #13
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Yep! You're right. I've tried many combinations and tested with ADE, calibre reader and Firefox and the results are inconsistent. This deceptively simple requirement appears to be quite intractable. Perhaps a future CSS standard will implement it.
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Old 12-28-2012, 04:06 PM   #14
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Exactly. It's a simple requirement, but there's no easy solution. Best thing to do at the moment is to simply leave a reasonable top margin, then insert whatever it is you want on the page (it's generally some sort of title page that you want this for).
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Old 12-28-2012, 05:03 PM   #15
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I'll give it a try and report back.
Doesn't seem o do much for ePub.
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