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[RFC] Set Error State Matcher from Control Model #1080

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[RFC] Set Error State Matcher from Control Model #1080

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11 changes: 11 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1071,6 +1071,17 @@ export const DEFAULT_ERROR_STATE_MATCHER: DynamicErrorMessagesMatcher =
};
```

You can also set an error matcher on a per control basis by assigning it under the `additional` field:
```ts
new DynamicInputModel({
id: "sampleInput",
label: "Sample Input",
additional: {
errorStateMatcher: myCustomErrorMessagesMatcher
}
})
```

Please note here that NG Dynamic Forms always assumes both the control being invalid and error messages being defined on the model
as a fixed precondition.

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20 changes: 12 additions & 8 deletions projects/ng-dynamic-forms/core/src/lib/service/dynamic-form-validation.service.ts
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Expand Up @@ -136,14 +136,18 @@ export class DynamicFormValidationService {
control.updateValueAndValidity();
}

showErrorMessages(control: AbstractControl, model: DynamicFormControlModel, hasFocus: boolean): boolean {

const precondition = control.invalid && model.hasErrorMessages;
const matcher = this._DYNAMIC_ERROR_MESSAGES_MATCHER ? this._DYNAMIC_ERROR_MESSAGES_MATCHER(control, model, hasFocus) :
DEFAULT_ERROR_STATE_MATCHER(control, model, hasFocus);

return precondition && matcher;
}
showErrorMessages(control: AbstractControl, model: DynamicFormControlModel, hasFocus: boolean): boolean {
const precondition = control.invalid && model.hasErrorMessages;

const matcher =
model["getAdditional"] !== undefined && model["getAdditional"]("errorStateMatcher")
? model["getAdditional"]("errorStateMatcher")
: this._DYNAMIC_ERROR_MESSAGES_MATCHER
? this._DYNAMIC_ERROR_MESSAGES_MATCHER
: DEFAULT_ERROR_STATE_MATCHER;

return precondition && matcher(control, model, hasFocus);
}

parseErrorMessageConfig(template: string, model: DynamicFormControlModel, error: any = null): string {

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