[TYPO3-dev] BE module with extJs but in 4.2.8

[Steffen Kamper]

Hi,

why xclassing backend.php? It's not needed to use ExtJS in BE module.
Also xclass of template is not the way i would do. Simply add the needed 
JS to $doc.

For
JSON output register an AJAX handler key, look in config_default.php for 
examples. Thes calls using the AJAX handler key are dispatched from 
ajax.php and call your registered function direct. There you can
return json_encode($myArray);

vg Steffen