TypeError extending static function object with inheritance level > 1

[sap]

TypeError extending static function object with inheritance level > 1

[akudev]

Hi,

not sure I get the point... this scenario works fine for e.g. commons.DropdownBoxRenderer and also a simple definition like:
var r1 = sap.ui.core.Renderer.extend(sap.ui.commons.ButtonRenderer);
var r2 = sap.ui.core.Renderer.extend(r1);
works. And I don't immediately see where "_super" is overwritten.
Can you provide a failing jsbin example?

Thanks
Andreas

[cmastrandrea]

This happens when extending the PanelRenderer, since it has a static function object:

var r1 = sap.ui.core.Renderer.extend(sap.ui.commons.PanelRenderer);
var r2 = sap.ui.core.Renderer.extend(r1);

[akudev]

Doesn't fail for me...:
http://jsbin.com/qecuyuyu/1/edit

[cmastrandrea]

Modified example at http://jsbin.com/qecuyuyu/7/edit shows the failure. If you look in the console, you'll see "Uncaught TypeError: Cannot read property 'apply' of undefined" errors.

[machwitt]

Dear cmastrandrea,
Thank you very much for reporting this one
I forwarded this internally as ticket 0120031469 0000770032 2014.

Best regards,
Martin

[machwitt]

Dear cmastrandrea,
just received some feedback on this one: As a workaround, you could rely on the renderer inheritance that Notepad controls provide:

If you specify a renderer as object literal or function, the Notepad controls automatically let that object inherit from the renderer of the base class. and this inheritance does not use the Renderer.extend
but an improved implementation based on a prototype chain.

Nevertheless, this issue is still open and we need to be workon it.

Best Regards,
Martin