Ajaxformcomponentupdatingbehavior example in wicket
If you are new to Wicket and want an overview of his history and features you might find useful this presentation. Admittedly, this is a fairly simple example especially to the experienced wicket users. At first, we will create a helper class which will hold the key-value pairs for the options in the DropDownChoice.
But then it is still my first open contribution to the building documentations available in the wicket community. Don't get hung up on the idea that the value returned has to be a property of the objects in your list. If you have a cross-cutting concern authorization strategy, configure listener, before render listener, etc overriding component's visibility then call component. The type of object returned by the model and the type of objects in the list must be the same.
If you want to display something different than the integer, you have to implement some custom code in ChoiceRenderer. Before I delve into code, I would like to give a good example of a popular use-case for the above. Dropdown choice is also known as combo box in some quarters.
For the purpose of this example and for simplicity, I would be showing two drop down boxes. Imagine a drop down choice of countries where the user chooses a country first then chooses a State afterwards. Had to ditch the whole wicket ajax handling and do it in jQuery instead was basically just taking an input field and doing a calculation that should be rendered in another label. In the immediate future, i would make available the above code and the whole project on github.
The purpose of field was only to dinamically update a list of email so its not necessary required.
If an outside component controls another's visibility the best way is to override the controlling component's onConfigure and call controlled. This is probably the most outstanding improvement based on lambda expressions. If the component itself controls its own visibility the best way is to override onConfigure and call setVisible inside. LambdaModel PropertyModel uses textual expressions to resolve object properties. If all of these fail, as a last resort override component.
Implement Wicket component visibility changes properly
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