jQuery Validate Plugin - How to create a simple custom rule?

Question

How do you create a simple, custom rule using the jQuery Validate plugin (using addMethod) that doesn't use a regex?

For example, what function would create a rule that validates only if at least one of a group of checkboxes is checked?

Answer 1

You can create a simple rule by doing something like this:

jQuery.validator.addMethod("greaterThanZero", function(value, element) {
    return this.optional(element) || (parseFloat(value) > 0);
}, "* Amount must be greater than zero");

And then applying this like so:

$('validatorElement').validate({
    rules : {
        amount : { greaterThanZero : true }
    }
});

Just change the contents of the 'addMethod' to validate your checkboxes.