[jQuery] Validate optional field
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).