Question

Using jQuery validation plugin –

http://docs.jquery.com/Plugins/Validation

Wanting to use the remote method on a field (username) to check if the username is unique (response is in a json format – cannot use php). So, all of the remote methods I see use php with a function for processing within the php file. Obviously, with json, I can’t do that.

So using “remote”, how would I check uniqueness from a json response?

Answer 1

The response is evaluated as JSON and must be true for valid elements, and can be any false, undefined or null for invalid elements.

Make use of plugin like this:

$("#your_form").validate({
  rules: {
    username: {
      required: true,
      email: true,
      remote: "check_username.php"
      // or other server side script 
      // or JSON response (must be boolean) 

    }
  }
});

Above code will makes the username field required, an username and does a remote request to check if the given username is already taken.