Custom Validators
Custom validators are just functions which accept the following parameters:
Note: If you don't need all the parameters, your function doesn't have to use them.
Synchronous Validators
This is a simple example of a synchronous US Zip Code validator function, that just takes the current value:
Note: There's a built-in regular expression validator that you could also use for validating zip codes.
Asynchronous Validators
Asynchronous validators are also supported. This allows you to perform validations that might take a long time: a complex calculation, or validation via AJAX, for example.
These are very similar to synchronous validators, but they should return a promise, which resolves to an array of errors:
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