Ajaxformcomponentupdatingbehavior 1 5

These components come with a version of methods on Submit, on Error and on After Submit that takes in input also an instance of Ajax Request Target.Building an entire site using AJAX can be risky as some clients may not support this technology.But if you have a custom component create by yourself from more components or even one like Date Field, Date Text Field , you will have to add a behavior to every sub-component to make your form update through ajax.For example, a Date Time Field must respond if we change something inside its text field or if we change hours or minutes through its internal text fields, or AM/PM through its internal drop down choice.In order to provide an usable version of our site also to these clients, we can use components Ajax Fallback Link and Ajax Fallback Button which are able to automatically degrade to a standard link or to a standard button if client doesn't support AJAX. Ajax Check Box is a checkbox component that updates its model via AJAX when user changes its value.Its AJAX callback method is on Update(Ajax Request Target target).With proper mark-up/logic separation, a POJO data model, and a refreshing lack of XML, Wicket makes developing web-apps in Java simple and enjoyable again.Swap the boilerplate, complex debugging and brittle code for powerful, reusable components written with plain Java and HTML.

Inside Date Time Field we can override a new Date Text Field method to add our behavior.

AJAX components are not different from any other component seen so far and they don't require any additional configuration to be used.

As we will shortly see, switching from a classic link or button to the ajaxified version is just a matter of appending “Ajax” to the component class name.

The most commonly used method of this interface is probably add(Component… With this method we tell Wicket to render again the specified components and refresh their markup via AJAX: Components can be refreshed via Ajax only if they have rendered a markup id for their related tag.

As a consequence, we must remember to set a valid id value on every component we want to add to Ajax Request Target.


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