/TypeScript/Angular from date to date validation

Angular from date to date validation

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')
]});

Source: stackoverflow.com

Similar codes

0 vote278 views1 answer
TypeScript interface for object with arbitrary numeric property names?
TypeScript
8 votes339 views2 answers
Typescript react elements
TypeScript
0 vote276 views2 answers
List elements not in indices
TypeScript
35 votes327 views3 answers
Module.exports multiple functions
TypeScript
0 vote274 views1 answer
3 inputs in a row
TypeScript
0 vote293 views2 answers
Minikube arguments --cpus
TypeScript
1 vote270 views1 answer
From sklearn.datasets import fetch_mldata error
TypeScript
0 vote287 views1 answer
Ex term 15
TypeScript
0 vote271 views1 answer
What do you need local sccripts for
TypeScript
0 vote292 views1 answer
Third party components in react native
TypeScript