Available Shims

The original validations plugin for CanJS included a basic validation library, it was ported over to can-validate as it's own library and can be used with can-validate using it's shim.

There is also a shim for the popular library ValidateJS.

More libraries/shims may be added in the future but it is very easy to create a shim for any library in your project.

Creating your own shim

Start by extending can.Construct.

var Shim = can.Construct.extend({});

You'll need can and your library, so let's add them...

import can from 'can';
import myLibrary from 'awesomeLibrary';

var Shim = can.Construct.extend({});

We might as well register the shim now...

import can from 'can';
import myLibrary from 'awesomeLibrary';

var Shim = can.Construct.extend({});

can.validate.register('myLibrary', Shim);

Sweet. Looks good so far. Now let's add the meat.

import can from 'can';
import myLibrary from 'awesomeLibrary';

var Shim = can.Construct.extend({
    isValid: function (value, options, name) {
        return;
    },
    once: function (value, options) {
        return;
    },
    validate: function (values, options) {
        return;
    }
});

can.validate.register('myLibrary', Shim);

This is all that is required. Not a lot of validation going on but the rest depends on how your validation library works.

You may need to process the options or values a bit. You might even need to make sure the errors object is correct.

Remember, these methods should return undefined if no errors occurred. Otherwise, they should return an array of errors.