Validating email format javascript

18-Jul-2017 10:01

validating email format javascript-79


This allows you to differentiate from coding errors and validation errors.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.Any A type promise can be used, just override function success(attributes) function error(errors) var constraints = ; var attributes = ; // Will call the success function and log validate.async(attributes, constraints).then(success, error); // Will call the error function validate.async(, constraints).then(success, error); function Validation Errors(errors, options, attributes, constraints) Validation Errors.prototype = new Error(); // This isn't supported by the ES6 promises validate.async(, constraints, ) .then(success) .catch(Validation Errors, function(error) ) .catch(function(error) ); // Supporting another promise implementation (RSVP in this case) validate. Promise; Sometimes you only want to validate a single value against some constraints and using the normal validate function is quite verbose so there is a shorthand for this.

If an is thrown from an async validator the argument passed to the rejection handler will be that error.If the message is not a function and not a string it is simply returned as is.Sometimes it's nice to be able validate field differently depending on the input itself.The errors has the same format as the errors from the regular validation function.

Besides accepting all options as the non async validation function it also accepts two additional options; clean Attributes which, unless before resolving the promise and wrap Errors which can be a function or constructor that will be called with the errors, options, attributes and constraints if an error occurs.I find it quite common that you want to have constraints on an optional attribute.