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fix(docs): update errorState example to cover handle missing state #30059

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Nov 22, 2024
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fix(docs): update errorState example to cover handle missing state #30059

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10 changes: 5 additions & 5 deletions guides/creating-a-custom-form-field-control.md
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Original file line number Diff line number Diff line change
Expand Up @@ -357,14 +357,14 @@ ngDoCheck() {
}

private updateErrorState() {
const parent = this._parentFormGroup || this.parentForm;
const parentSubmitted = this._parentFormGroup?.submitted || this._parentForm?.submitted;
const touchedOrParentSubmitted = this.touched || parentSubmitted;

const oldState = this.errorState;
const newState = (this.ngControl?.invalid || this.parts.invalid) && (this.touched || parent.submitted);
const newState = (this.ngControl?.invalid || this.parts.invalid) && touchedOrParentSubmitted;

if (oldState !== newState) {
if (this.errorState !== newState) {
this.errorState = newState;
this.stateChanges.next();
this.stateChanges.next(); // Notify listeners of state changes.
}
}
```
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