/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 vote164 views1 answer
Can you make twitter bots in node.js
TypeScript
0 vote211 views2 answers
From date and to date validation in angular 9
TypeScript
13 votes176 views3 answers
How to check whether a string contains a substring in typescript online
TypeScript
0 vote153 views1 answer
How many blocks are there in minecraft
TypeScript
1 vote123 views1 answer
Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
TypeScript
0 vote188 views1 answer
Typescript throw not implemented exception
TypeScript
2 votes144 views1 answer
Check if file exists laravel
TypeScript
0 vote166 views1 answer
What are the common mistakes in testing
TypeScript
0 vote147 views1 answer
Four basic components that information system consists of
TypeScript
1 vote151 views1 answer
Wordpress robots txt file
TypeScript