/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

0 vote260 views1 answer
Type 'string' is not assignable to type 'ArrayBufferLike'
TypeScript
0 vote245 views1 answer
Not able to use fonts awesome in react
TypeScript
0 vote249 views1 answer
Typescript static example
TypeScript
0 vote237 views1 answer
Gatsby typescript starter hello world
TypeScript
0 vote272 views1 answer
Print query from get_posts wordpress
TypeScript
0 vote239 views1 answer
Mongodb nest.js
TypeScript
11 votes218 views1 answer
Check open ports windows
TypeScript
0 vote244 views1 answer
How to pass data between requests
TypeScript
2 votes261 views2 answers
Wordpress directory and its permissions
TypeScript
1 vote244 views1 answer
Mat auto complete floating issue
TypeScript