Extending `sap.fe` controller, oData V4

[jorgt]

OpenUI5 version: 1.85.2

Browser/version (+device/version): Any

I'm trying to extend the controller of a V4 based application. The page map does not seem to support it, and the guided development only lists the options for V2 apps.

Steps to reproduce the problem:

• Create a Fiori Elements V4 application List Report / Object page (which I understand is now part of OpenUI5)
• Try extending a controller like a V2 app does not work, probably because it doesn't use the old template

"sap.suite.ui.generic.template.ListReport.view.ObjectPage": {
     "controllerName": "namespace.ObjectPage.Extension"
}

• Try extending the sap.fe based controller:

"sap.fe.templates.ObjectPage.ObjectPageController": {
    "controllerName": "namespace.ObjectPage.Extension"
}

Errors:

oController in the above is indeed undefined.

The controller:

sap.ui.define(['sap/fe/templates/ObjectPage/ObjectPageController'], function(Controller) {
  'use strict';

  return Controller.extend("namespace.ObjectPage.Extension", {

  });
});

I have tried just declaring it without extending the ObjectPageController too, both in error.

[codeworrior]

sap.feis not part of OpenUI5. It has been published as an add-on to OpenUI5, but it is not part of it (see https://www.npmjs.com/package/@sap/open.fe). Unfortunately, colleagues did not establish a feedback channel for open.fe yet. I can only propose to raise future questions on SAP Community.

Reg. your issue: AFAIK, the sap.fe library does not use the single inheritance mechanism of Controller.extend, but rather relies on controller extensions. They allow to combine multiple, potentially layered extensions for a single controller.

Due to this, inheriting from Controller is not the right way. Your extension should more look like this:

sap.ui.define(["sap/ui/core/mvc/ControllerExtension"], function(ControllerExtension) {
    "use strict";
    return ControllerExtension.extend("SalesOrder.custom.LRExtend", {
        //Place for your custom coding
    });
});

I'm also not sure if this extension mechanism is already a future-proof public offering. At least, I'm aware of discussions regarding the right way to configure controller extensions in the manifest.

As sap.fe is not part of OpenUI5, I close this issue here.

[jorgt]

extending sap/ui/core/mvc/ControllerExtension was correct, for the moment.