I'm trying to validate an optional field with the validation plugin, using a custom method. Here's the code:
rules: { birthdate: { validBirthdate:true } }, messages: { birthdate: { validBirthdate: "Invalid birthdate" } } How do I make this field optional? I only want to check the birthdate if the user has provided one. (I'm aware of the "date" method, but I'm purposely using a custom method).