/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

-1 vote178 views2 answers
Size of array typescript
TypeScript
0 vote154 views1 answer
How to get values from api and iterate through array in typescript and angular
TypeScript
1 vote191 views1 answer
Import on save typescript
TypeScript
0 vote245 views1 answer
CUSTOM_ELEMENTS_SCHEMA error occur while unit testing with jasmine and karma
TypeScript
0 vote164 views2 answers
How to make auto conversion of blogger texts with fonts installed in blog theme
TypeScript
0 vote160 views1 answer
Mongoose model enum
TypeScript
0 vote185 views1 answer
Angular material date picker add dates automatically
TypeScript
1 vote169 views1 answer
CLIENT MISSING INTENTS discord
TypeScript
1 vote169 views1 answer
Sass migrate division vue
TypeScript
20 votes183 views10 answers
Nodemon
TypeScript