WICKET MULTIPLE FILE UPLOAD CODE

Otherwise Wicket would complain about missing components at runtime.

When you have added more Wicket IDs to the HTML than represented in the model class, you can bind them using this mechanism too. Register a BindingInterceptor with which you can substitute default components by specific Wicket IDs.

But if you need to after all, you can extend this by the following means: Despite this automated binding, you normally don't have to do much more on the Wicket side of things. This will process the HTML file using the Visitor Pattern, find all Wicket IDs, match them against the model elements and instantiate components for them while creating a dynamic component tree according to the markup hierarchy.

Implement Wicket Page/Panel Class with GeneratedBinding Callįor each of your model classes, create a corresponding Wicket page or panel class that calls the GeneratedBinding inside its constructor.

You can also write headless unit tests on those models using a mocked GuiService and the WicketTester (only for providing the Wicket context, not for actual rendering) to validate your model behavior.

Implement hashCode and equals methods for your model to control when the framework should reuse page instances after redirects or direct browser access.

It is useful to extend AValueObject in your models, since it offers a DirtyTracker with which it is easy to check for model changes and warn the user about data loss when redirecting without saving.

The framework will automatically register onchange listeners for you and handle the page submit. To change this and make better use of AJAX, you can add the annotation where desired to give the user immediate feedback after he changes properties.

The default interaction scenario on the web is lazy form submission in order to save bandwidth and server load.

Return other models from your action elements to cause a redirect there, or return null to prevent that.

You can also secure actions via the annotation to allow them only for specific user roles and show also an error dialog on violation.

Throw checked exceptions with messages from your action elements to show the user default error dialogs.

The Roles class allows you to check user permissions from anywhere. You can also access the Wicket RequestCycle, WebApplication and WebSession from anywhere.

Add utility methods for dynamic hide, disable, tooltip and titles to enhance your view logic.

For more complex scenarios, write custom validators that intercept new values coming in from the UI and validate against other existing values from your model.

Add BeanValidation (JSR-303 and JSR-349) annotations to your property elements to keep your models clean from invalid user inputs.

WICKET MULTIPLE FILE UPLOAD CODE

The GuiService class allows you to display messages, show modals, do extended internationalization and do page redirects from anywhere without making your model code aware of any Wicket specific details.

Missing setters for properties or null values will automatically result in disabled view components. Everything public will be picked up by the generator, though you can use the annotation to hide even public things.

Use property and action methods to define your user interactions.

After you have defined what your view should look like and what behavior it is supposed to have, translate that concept into one or more model classes that represent your ideas.

Wicket multiple file upload