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https://issues.apache.org/jira/browse/WICKET-1497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13883999#comment-13883999
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Antti Lankila commented on WICKET-1497:
---------------------------------------
I'm seeing this issue.
The culprit appears to be this code in wicket-date.js:
} else if (document.documentElement &&
document.documentElement.clientHeight) {// IE 6 strict mode
viewPortHeight = document.documentElement.height;
Observe that it tests presence of clientHeight but now accesses height. This
causes the return of undefined on IE8 at the very least on an application I'm
working with.
> viewport height not correctly calculated on IE7
> -----------------------------------------------
>
> Key: WICKET-1497
> URL: https://issues.apache.org/jira/browse/WICKET-1497
> Project: Wicket
> Issue Type: Bug
> Components: wicket-datetime
> Affects Versions: 1.3.3
> Reporter: Arnout Engelen
> Assignee: Igor Vaynberg
>
> I noticed the vertical positioning of the popup isn't corrected properly
> under IE7.
> Digging in the code, I found that Wicket.DateTime.getViewportHeight() returns
> 'undefined' under IE7. This is a hack to work around an old problem in the
> standard YAHOO.util.Dom.getViewportHeight();.
> It seems the hack is now broken, and the standard
> YAHOO.util.Dom.getViewportHeight(); has since been fixed: after replacing
> Wicket.DateTime.getViewportHeight() with YAHOO.util.Dom.getViewportHeight();
> it now works fine under both IE and FF again.
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