Different set of validators for AjaxFormComponentUpdatingBehavior and form submission

问题

In Wicket, I have written a AjaxFeedbackComponent component that takes a regular form component (such as a TextField) and feedback field and provides validation with instant feedback as the user types. I use it for user registration, for example, to validate the minimum password length, or a duplicate username etc (similar to the Twitter signup page). For, I have registered a AjaxFormComponentUpdatingBehavior with the form component and update the feedback field with the ajax request:

formComponent.add(new AjaxFormComponentUpdatingBehavior("onkeyup") {

    @Override
    protected void onUpdate(AjaxRequestTarget target) {
        target.add(AjaxFeedbackComponent.this.feedback);
        AjaxFeedbackComponent.this.onUpdate(target);
    }

    @Override
    protected void onError(AjaxRequestTarget target, RuntimeException e) {
        super.onError(target, e);
        target.add(AjaxFeedbackComponent.this.feedback);
    }
});

This works great, as expected. However, for usability reasons I do not want some of the validators to be run within the Ajax form processing, but I only want to run them when the final form is submitted. I'm aware of IFormValidator, which are not called during the AjaxFormComponentUpdatingBehavior event processing, but it seems like a code smell to add validators to the form that actually are validators that concern single fields only and should be encapsulated in the respective from components, say within UsernameRegistrationField.

For example, if I set formComponent.setRequired(true), and the user navigates through the form using TAB keys, the onkeyup event is fired before the user has even started typing a username -- and immediately the validator's .Required error message is shown. This is a bit awkward for the user. Therefore I'd like to be able to mark a field as required for the form processing, but skip the required validation in the ajax processing. For some other reasons I also want to delay (some "costly") other validators to the final form processing.

So my question is: How can I disable a validator on a form component within the AjaxFormComponentUpdatingBehavior processing, but do not disable individual form component validation completely? Or do I really have to do all the individual field's validation as a IFormValidator? Or would this be a good fit for setDefaultFormProcessing()?

回答1:

If you're using non-Ajax form submits, your validators could do 'light' checks only, by checking the existence of an ART:

boolean light = RequestCycle.get().find(AjaxRequestHandler.class) != null;

Otherwise your AjaxFormComponentUpdatingBehavior could store a flag in the requestCycle's metaData, which allows your validator (or a validator wrapper) to check for a 'light' validation.

来源：https://stackoverflow.com/questions/23967621/different-set-of-validators-for-ajaxformcomponentupdatingbehavior-and-form-submi