/TypeScript/From date and to date validation in angular 8

From date and to date validation in angular 8

export class CustomeDateValidators {
    static fromToDate(fromDateField: string, toDateField: string, errorName: string = 'fromToDate'): ValidatorFn {
        return (formGroup: AbstractControl): { [key: string]: boolean } | null => {
            const fromDate = formGroup.get(fromDateField).value;
            const toDate = formGroup.get(toDateField).value;
           // Ausing the fromDate and toDate are numbers. In not convert them first after null check
            if ((fromDate !== null && toDate !== null) && fromDate > toDate) {
                return {[errorName]: true};
            }
            return null;
        };
    }
}

/*--- implementations ---*/
this.form = this.fb.group({
  fromDate: null,
  toDate: null,
}, { validator: [
  //Default error with this validator:  {fromToDate: true}
  CustomeDateValidators.fromToDate('fromDate', 'toDate')
  
  // For custome error name like: {customeErrorName: true}, pass third optional parameter with custome name
  // CustomeDateValidators.fromToDate('fromDate', 'toDate', 'customeErrorName')
]});

Similar codes

7 votes358 views2 answers
How to download torrents in ubuntu
TypeScript
0 vote349 views1 answer
Create if not exists rails
TypeScript
0 vote324 views2 answers
Angular start date end date validation
TypeScript
1 vote345 views1 answer
Cannot find module jquery typescript ionic
TypeScript
8 votes325 views3 answers
Update local angular cli
TypeScript
0 vote369 views1 answer
{"msg": "Attempting to decrypt but no vault secrets found"}
TypeScript
1 vote349 views1 answer
Drop index if exists mysql
TypeScript
11 votes351 views1 answer
Eliminate dots li
TypeScript
0 vote372 views1 answer
Hsts wordpress
TypeScript
4 votes320 views2 answers
Setup express with typescript
TypeScript