20 lines
813 B
TypeScript
20 lines
813 B
TypeScript
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import { ValidatorFn, FormGroup, ValidationErrors } from '@angular/forms';
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/**
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* Constant to validate a `duration` field.
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*
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* `([0-9]+)` looks for a number with any length to the `:` (optional).\n
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*
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* `([0-5][0-9]?)?`: The user can optionally enter a number for minutes/seconds (0 - 59)
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*
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* Afterwards the duration can be specified as hours or minutes (via `[h|m]?` - optional). Defaults to `h`.
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*
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* @param control The form-control to validate
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*
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* @returns {ValidationErrors | null} Null, if the input is correct, `ValidationErrors` otherwise.
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*/
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export const durationValidator: ValidatorFn = (control: FormGroup): ValidationErrors | null => {
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const regExp = /^\s*([0-9]+)(:)?([0-5][0-9]?)?\s*[h|m]?$/g;
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return regExp.test(control.value) || control.value === '' ? null : { valid: false };
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};
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