/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

2 votes106 views1 answer
Socketi io client disconnect
TypeScript
0 vote107 views1 answer
Elipses after hight
TypeScript
0 vote71 views1 answer
How to permit only a few values in dbms
TypeScript
1 vote109 views1 answer
React-native loading bar
TypeScript
0 vote111 views1 answer
The softness of a spot lights edge is controlled by penumbra angle, value gives perfect hard edge:
TypeScript
0 vote102 views1 answer
Angular api rest
TypeScript
0 vote107 views1 answer
Calling from a list elements in steps
TypeScript
19 votes141 views5 answers
Delete all documents in a collection mongodb
TypeScript
3 votes124 views1 answer
Arraylist of objects in java
TypeScript
1 vote105 views1 answer
Python get elements from list of dictionaries
TypeScript