FormControls updateOn property should be able to set

🚀 feature request

Relevant Package

This feature request is for @angular/forms

Description

The only way to set a FormControl’s updateOn property is in the constructor. In my case I’m writing an app and a library of controls for myself and my team to use. We have a set of custom validators that all are supposed to work with updateOn: 'blur' and so in my BaseValidator (which all validators extend) I want to force updateOn: 'blur'. However, the FormControl is defined in the app that consumes the BaseValidator.

Describe the solution you’d like

const fc = new FormControl('');
fc.setUpdateMethod('blur');

Describe alternatives you’ve considered

I’ve tried to work around the issue by using setControl but to no avail.

[bene-starzengruber]

This would be very appreciated. As a workaround it is currently possible to do something like this

changeFormUpdateStrategy(formControl: FormControl, strategy: 'blur' | 'change') {
  Object.defineProperty(formControl, 'updateOn', {
    get: () => strategy,
    configurable: true
  });
}

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