The custom validator in Material2 Datepicker successfully returns a date object instead of a string

Question

The custom validator in Material2 Datepicker successfully returns a date object instead of a string

Im currently working on developing a unique custom validator for the datepicker feature within a reactive form group.

Within my code file, specifically the .ts file:


        form: FormGroup;

        constructor(
            private fb: FormBuilder,
            private validatorSrv: CustomValidatorService,
        ) {}

        createForm(): void {
            this.form = this.fb.group({ 
                trans_date: [null, [Validators.required, this.validatorSrv.validDate]] 
            });
        }

Now, focusing on the CustomValidatorService class:


        validDate(c: AbstractControl): any {
           // It always return 'Mon Jan 01 2001 00:00:00 GMT+0800 (Taipei Standard Time)' 
           // When value is 1
           // And 'Sat Dec 01 2001 00:00:00 GMT+0800 (Taipei Standard Time)'
           // When value is 12
           console.log(c.value); 
        }

In the scenario mentioned above, it consistently outputs a JavaScript datetime object.

Is there a way to extract the exact input value from the custom validator's AbstractControl?

javascript angular typescript datepicker angular-material2

Answer 1

Answer №1

It is a frequent occurrence. One solution is to change the date to a string within your validator.

If you are unaware, the Angular Material datepicker has compatibility with moment.js.

For your situation, utilizing this feature may be beneficial. By doing so, you could address your problem simply by converting your date using one of the various functions provided by moment.

Answer 2

It is a frequent occurrence. One solution is to change the date to a string within your validator.

If you are unaware, the Angular Material datepicker has compatibility with moment.js.

For your situation, utilizing this feature may be beneficial. By doing so, you could address your problem simply by converting your date using one of the various functions provided by moment.

Answer 3

Answer №2

It's always a challenge to decide on the best approach for custom date validation, especially when considering the common use of date objects over user input strings. While some may opt for an AbstractControl custom format validation, I find this method to be overly complex for my needs.

Instead, I prefer a more straightforward solution by implementing a simple function triggered on the keypress event of the control for validation purposes.

checkDateValidity(): boolean {
   // Omitted lengthy logic for brevity...
   if (format matches mm/dd/yyyy or mm-dd-yyyy) { return true; }
   return false;
}

handleDateValidation(e: any): void {
    const control = this.form.get('trans_date');

    if (this.checkDateValidity(e.target.value)) {
      control.setErrors(null);
    } else {
      control.setErrors({ invalidDate: true });
    }
}

The ability to programmatically assign errors to a ReactiveForm Control using the setErrors() method is truly remarkable.

Answer 4

It's always a challenge to decide on the best approach for custom date validation, especially when considering the common use of date objects over user input strings. While some may opt for an AbstractControl custom format validation, I find this method to be overly complex for my needs.

Instead, I prefer a more straightforward solution by implementing a simple function triggered on the keypress event of the control for validation purposes.

checkDateValidity(): boolean {
   // Omitted lengthy logic for brevity...
   if (format matches mm/dd/yyyy or mm-dd-yyyy) { return true; }
   return false;
}

handleDateValidation(e: any): void {
    const control = this.form.get('trans_date');

    if (this.checkDateValidity(e.target.value)) {
      control.setErrors(null);
    } else {
      control.setErrors({ invalidDate: true });
    }
}

The ability to programmatically assign errors to a ReactiveForm Control using the setErrors() method is truly remarkable.

The custom validator in Material2 Datepicker successfully returns a date object instead of a string

Answer №1

Answer №2

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