I am looking to add an observable or event emitter field (such as onMarkAsDirty) to all objects of the FormControl type. This field should be triggered when the markAsDirty method is called. I attempted to achieve this by extending the prototype of FormControl, but found it too challenging. Would you be able to assist me by providing some guidance or example code snippets?
Creating a subclass is simple. You can find the code for FormControl (actually AbstractControl) on github
Here's an example:
export class FormControlExtends extends FormControl {
markAsDirty(opts: { onlySelf?: boolean } = {}): void {
(this as { pristine: boolean }).pristine = false;
if (this['_parent'] && !opts.onlySelf) {
this['_parent'].markAsDirty(opts);
}
//do more stuff
console.log('say hello');
}
}
Note that to access a private variable (like "_parent" in this case), you should use square brackets instead of dot notation, so it would be this['_parent'] instead of this._parent
You can then use it like this:
control=new FormControlExtends(null)
Check out this stackblitz for a demo.
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