Matching password validation in angular 5+

Create new directive:

import { Validators, NG_VALIDATORS, AbstractControl, ValidationErrors, ValidatorFn} from "@angular/forms";
import { Directive, Input } from "@angular/core";
import { Subscription } from "rxjs";

export function compareValidator(controlNameToCompare:string): ValidatorFn{
return (c:AbstractControl):ValidationErrors | null => {
if(c.value === null || c.value.length === 0){
return null;
}
const controlToCompare = c.root.get(controlNameToCompare);
if(controlToCompare){
const Subscription:Subscription = controlToCompare.valueChanges.subscribe(()=>{
c.updateValueAndValidity();
Subscription.unsubscribe();
})
}
return controlToCompare && controlToCompare.value !== c.value ? {'compare': true}:null;
};
}

@Directive({
selector: "[compare]",
providers: [{
provide: NG_VALIDATORS,
useExisting: compareValidatorDirective,
multi: true
}]
})
export class compareValidatorDirective implements Validators {
@Input('compare') controlNameToCompare: string;
validate(c:AbstractControl):ValidationErrors | null {
return compareValidator(this.controlNameToCompare)(c);
}
}

Now call the directive in Component.ts file

Note: you need to import directive first then compareValidator() function will work.

confirmPass: new FormControl("", [Validators.required, compareValidator('Password')]),

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