/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 vote325 views1 answer
Hardness of water is due to the presence of salts of
TypeScript
0 vote320 views1 answer
Gpluss logi ionic4
TypeScript
0 vote351 views2 answers
Gradients colors in android
TypeScript
14 votes335 views4 answers
Filter max value from array typescript
TypeScript
0 vote299 views1 answer
How to pass data to another page in ionic 3
TypeScript
0 vote330 views1 answer
Install snowpack
TypeScript
0 vote358 views1 answer
Code to check if a triangle is valid or not
TypeScript
0 vote355 views1 answer
How to specify output directory in TypeScript?
TypeScript
0 vote339 views1 answer
R merge lists override
TypeScript
0 vote354 views1 answer
Difference between scripted testing and exploratory testing
TypeScript