Why am I getting oEvent.getParameter('data') undefined on dataReceived event?

Question

this.getView().bindElement({
  path: `/Employees('${this._userId}')`,
  parameters: { expand: 'aaa,bbb,ccc' },
  events: {
    dataReceived: (oEvent) => {
      this.getView().setBusy(false)
      debugger
    }
  }
});

I can see data in the response of the $batch request. When I put a breakpoint in the dataReceived function handler, I can also see the data via this.getView().getModel().getProperty(this.getView().getBindingContext().getPath()) . The parameter oEvent.mParameters.data exists, but the value is undefined .

If I leave out expand , the data is set. Do all entities of an associated entityset need to have an association to its parent?

Answer 1

This is by design according to the API reference of dataReceived :

dataReceived

[...] This event may also be fired when an error occurred .

Param	type	description
data	string	The data received; is undefined in error cases

You must have somewhere an error message in the $batch response, or the request was somehow aborted.

The missing data parameter is currently the only documented indicator for a failed request on bindObject / bindElement .

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PS: See also https://github.com/SAP/openui5/issues/2263