Typo3 override backend classes

Question

It's been a few weeks I work on Typo3 6.2 and I want to know how to override Typo3 Core classes .

In my case, I have to edit the way select html objects are displayed (I want to add optgroup but Typo doesn't allow us to do it). So I edited the file "FormEngine.php" (typo3/sysext/backend/Classes/Form) and now it works. But this isn't healthy for future upgrade.

Is there a way to override core classes like any other CMS would allow us to do ? And I haven't been able to find something on the Internet and I think it could be useful.

Thank you :)

• Zisiztypo

Answer 1

Instead of modifying source code of CMS you can just declare a field with a user type and then point your custom userFunc

From the ref :

'tx_examples_special' => array (
        'exclude' => 0,
        'label' => 'LLL:EXT:examples/Resources/Private/Language/locallang_db.xlf:fe_users.tx_examples_special',
        'config' => array (
                'type' => 'user',
                'size' => '30',
                'userFunc' => 'Documentation\\Examples\\Userfuncs\\Tca->specialField',
                'parameters' => array(
                        'color' => 'blue'
                )
        )
),

TIP: Using this approach, you can create ANY type of field you need, it can be ie Google Maps selector, set of fields with common dependencies filled by JS, etc, etc.