/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

10 votes235 views2 answers
Python get first n elements of list
TypeScript
-1 vote230 views3 answers
Mysqli_fetch_array() expects parameter 1 to be mysqli_result
TypeScript
0 vote221 views1 answer
How to add 2 bind events on one button tkinteer
TypeScript
0 vote224 views1 answer
Checked a element is focused with its key pressed
TypeScript
0 vote230 views1 answer
Download blob typescript
TypeScript
1 vote211 views1 answer
Clinical thermometer consists of a long, narrow, uniformclinical thermometer consists of a long, narrow, uniform
TypeScript
0 vote267 views1 answer
Install material ui typescript
TypeScript
0 vote223 views1 answer
Deleting a comnent from arrays of comments in mongodb
TypeScript
0 vote223 views1 answer
Xargs / parallel
TypeScript
13 votes232 views4 answers
Change checkbox jquery alert
TypeScript