DateInputComponent throws TypeError in ngAfterViewInit when used with [formField] (signal forms) instead of Reactive Forms

[gordeevladislav]

Description

When using kendo-dateinput together with the new [formField] binding (Angular signal-based forms) instead of a Reactive Forms FormControl, the component throws an unhandled TypeError during initialization:

TypeError: Cannot read properties of undefined (reading 'subscribe')

Root cause

In DateInputComponent.ngAfterViewInit, the following line assumes this.formControl is always a Reactive Forms FormControl (or null), and unconditionally accesses .statusChanges:

this.subs.add(this.formControl?.statusChanges.subscribe(() => this.setAriaInvalid()));

The optional chaining (?.) only guards against this.formControl itself being null/undefined — it does not guard against this.formControl existing but statusChanges being undefined. When the component is bound via [formField] instead of [formControl]/formControlName, this.formControl.statusChanges is undefined, so .subscribe(...) is called on undefined and throws.

Steps To Reproduce

1. Create a component using Angular signal forms with [formField].
2. Bind kendo-dateinput to that field via [formField] instead of a Reactive Forms FormControl.
3. Load the component.

Screenshots or video

Actual Behavior

Component throws TypeError: Cannot read properties of undefined (reading 'subscribe') at runtime, breaking initialization.

Expected Behavior

DateInputComponent should not throw when used with [formField]. Either:

• Guard the subscription with a check for statusChanges existing (e.g. this.formControl?.statusChanges?.subscribe(...)), or
• Detect the binding type and use the appropriate mechanism to react to validity/status changes for signal-based forms.

Browser

Chrome

Browser version

latest

OS type

MacOS, Windows

OS version

No response

Last working version of the Kendo UI for Angular package (if regression).

No response

[destus90]

Kendo is not compatible with new Signal Forms API yet.

See https://feedback.telerik.com/kendo-angular-ui/1716257-feature-signal-forms