Validators are an essential part of building robust and reliable applications. They ensure that the data entered by the user is accurate, complete, and consistent. In Angular applications, validators provide a set of pre-defined validation rules that can be used to validate various form inputs such as text fields, number fields, email fields, date fields, and more.
min validator
max validator
minLength
maxLength
required
pattern validator
isSameOrBeforeToday
isSameOrAfterToday
currentOrLastYear
) that restricts data selection to the current or the previous year:
AsyncValidatorFn
param, which is a function that can be used to validate form input asynchronously. The validator is called smallerOrEqualsToNumber
and takes an array of params
as an input.
async
using the UI Designer.null
, indicating that the input is valid. If the input value is greater than the maximum loan amount value, the function returns a ValidationErrors
object with a key smallerOrEqualsToNumber
and a value of true, indicating that the input is invalid.