[TYPO3-core] FYI: Fixed bug #15121: htmlArea RTE: Javascript Error in IE7 prevent Link dialogue from opening

[Stanislas Rolland]

FYI: The attached SVN patch was committed.

Type:
Bugfix

Problem:
A JS error occurs when selecting an existing link in the RTE and trying 
to open the link update dialogue.

The error may be raised when a feature or an extension (such as DAM) 
adds some custom attributes on the link. The script then uses DOM method 
hasAttribute() which exists only in IE8...

Solution:
Test for the availability of the method. If not, test if getAttribute 
returns a non-null value.

Bugtracker references:
http://bugs.typo3.org/view.php?id=15121

Branches:
trunk (revision 8290)
TYPO3_4-4 (revision 8291)
TYPO3_4-3 (revision 8292)

Regards,
Stanislas
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