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You can use the async validate function even if no validations are async, it still returns a promise.You can not, however, use the regular function with async validations.They are meant to give a feeling for how to use the library and should not be considered production ready code.The native HTML form validate has been disabled in a demo purpose so that you may see how works in action.If an is thrown from an async validator the argument passed to the rejection handler will be that error.This allows you to differentiate from coding errors and validation errors.You can tell to use any A compatible promise implemention like this: There are already many validation libraries out there today but most of them are very tightly coupled to a language or framework.The goal of is to provide a cross framework and cross language way of validating data.

There are no required external dependencies at all!Unless otherwise specified you can always specify the message option to customize the message returned if the validator doesn't pass.Just remember to not include the attribute name since it's automatically prepended to the error message.The attributes must be a plain object or a form element, things like backbone models etc are not supported.For the format of the constraints see the constraints section.If the attributes objects is an HTML/DOM/j Query element Even though none of the built in validators are async it is sometimes useful to have async validations.

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