Question

I am trying to validate one input. So I wanna to get this kind of rule – if field value is equal to “xxx” (text) then field is valid.

I tried this, but it seems to work only if you want two inputs to be the same.

$("#contact-form").validate({
    rules: {
        capcode: {
            equalTo: "xxx"
        }
    }
});​

Answer 1

Not sure what are you trying to achieve, but you can always add custom validation method:

$.validator.addMethod("customValidation", function(value, element) {
    return value == 'xxx'
}, "Value must be 'xxx'.");​

And then simply use it on your field:

$("#contact-form").validate({
    rules: {
        capcode: {
            customValidation: true
        }
    }
});​

See this DEMO.