Is there support for validating one property of a model?

[derek-pavao]

I'm not sure if I just missed it in the docs, but is there a way to validate just one property at a time? My use case is I want to be able to validate individual properties in the browser to be able to provide immediate feedback to a user when they enter an invalid value in a text box. Anyone have discussions on this sort of feature in the past?

An example of what I'm envisioning, based on the example in the README.md

// given a defined schema for a user
env.addSchema('user', {
    type: 'object',
    properties: {
        firstname: {
            type: 'string',
            minLength: 2,
            maxLength: 15
        },
        lastname: {
            type: 'string',
            minLength: 2,
            maxLength: 25
        },
        gender: {
            type: 'string',
            enum: ['male', 'female']
        },
        email: {
            type: 'string',
            format: 'email'
        },
        password: {
            type: 'string',
            minLength: 8
        }
    },
    required: ['firstname', 'lastname', 'email', 'password']
});

// and given a user model
var userModel = {
    firstName: 'Derek',
    middleName: 'Jon',
    lastName: 'Pavao',
    gender: 'male',
    email: '',
    password: 'foobar'
};

// I'd like to be able to just validate the email property of the userModel. I'm thinking of two different syntax.

// The first syntax could be something like ...
var errors = env.validate('user.email', userModel);

// or the following syntax ...
var errors = env.validate('user', 'email', userModel);

If this is something people think could be useful, I'd be very interested in trying to put together a PR for this feature.

[acornejo]

I believe this is already supported, since JJV fully supports json pointers.

I am a bit rusty on the syntax, so I recommend you read the documentation on the spec on json-schema.org. I believe the syntax is something like:

env.validate('user#/properties/email', userModel.email);

However, given that validation is SO fast, I would personally not even bother with this. Just validate the entire object, you can filter the errors by field quite easily and only display the ones that you care about.

[acornejo]

given the lack of reply, I am closing this as solved. If this is not the case please reopen.

[derek-pavao]

Sorry, yeah. That above example will work for my purposes. Thanks.