apphouse/dist/models/Form/utils/validateField.ts

Component library for React that uses observable state management and theme-able components.

/**
 * Helper function to validate a field.
 * @param value the value of the field
 * @param required whether the field is required or not
 * @param validation the validation function for the field
 * @returns boolean if true, the field is valid, otherwise it is not
 */
export function validateField<T>(
  /**
   * The value of the field.
   */
  value: any,
  /**
   * Whether the field is required or not.
   */
  required: boolean,
  /**
   * A function to validate the value of the field.
   */
  validation?: (value?: T) => boolean
) {
  // if it is required, let's see if it has a value
  if (required) {
    if (value === undefined || value === '' || value === null) {
      return false;
    }
  }
  // if it has validation, let's see if it pass validation
  if (validation) {
    if (!validation(value)) {
      return false;
    }
  }

  return true;
}