/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

8 votes122 views2 answers
List of objects to string c#
TypeScript
0 vote125 views1 answer
Enable anchor scrolling angular
TypeScript
35 votes134 views2 answers
Typescript last index of array
TypeScript
0 vote144 views1 answer
Typescript function return array
TypeScript
1 vote133 views1 answer
React-router-dom redirect on click
TypeScript
0 vote129 views1 answer
How to Convert MATLAB Scripts to Python
TypeScript
0 vote130 views1 answer
Terminal update file metadata
TypeScript
0 vote139 views1 answer
Reported error code “128” when it ended: Permission denied (publickey). fatal: Could not read from remote repository. Please make sure you have the correct access rights and the repository exists.
TypeScript
0 vote126 views3 answers
Woocommerce remove This is where you can add new products to your store in taxonomy description
TypeScript
0 vote118 views1 answer
Export data in Documents outside sandbox in swift
TypeScript