22 lines
921 B
TypeScript
22 lines
921 B
TypeScript
// Core imports
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import { ErrorStateMatcher } from '@angular/material/core';
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import { FormControl, FormGroupDirective, NgForm } from '@angular/forms';
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/**
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* Custom provider that defines how form controls behave with regards to displaying error messages.
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*
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*/
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export class CustomErrorStateMatcher implements ErrorStateMatcher {
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/**
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* Checks whether an invalid input has been made and an error should be made.
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*
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* @param control - Tracks the value and validation status of an individual form control.
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* @param form - Binding of an existing FormGroup to a DOM element.
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* @returns true - If an invalid input has been made to the form control.
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*/
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isErrorState(control: FormControl | null, form: FormGroupDirective | NgForm | null): boolean {
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const isSubmitted: boolean = form && form.submitted;
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return !!(control && control.invalid && (control.dirty || control.touched || isSubmitted));
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}
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}
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