Server-side validation

UIKernel supports client-side and server-side validation. To define the server-side validation, we’re going to use UIKernel validator.


// define a validator using UIKernel.createValidator
  const serverValidator = UIKernel.createValidator()
      // define validation rules
     .field('name', UIKernel.Validators.regExp.notNull(/^\w{2,30}$/, 'Invalid first name.'))
     .field('surname', UIKernel.Validators.regExp.notNull(/^\w{2,30}$/, 'Invalid last name.'))
     .field('phone', UIKernel.Validators.regExp.notNull(/^(\d{3}-)?\d{2,10}$/, 'Invalid phone number.'))
     .field('age', UIKernel.Validators.number.notNull(0, 120, 'Invalid age.'))
     .field('gender', UIKernel.Validators.enum.notNull([1, 2], 'Invalid gender.'));

The field method accepts two arguments: a field name and a function for validation. Here, we’ve used synchronous validators provided by UIKernel. There are also asynchronous validators. You can read more about them here.