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Many of the attributes have default values which are not written in the JSON settings and they are initialized at the client side (i.e. wicket-ajax.js knows the defaults). The example above can be read as: when HTML element with id 'linkId' is clicked fire an Ajax call with Url 'the/url/to/the/link'.
If you need more examples how to use it from JS, take a look at wicket #wicket sources: wicket-core/src/test/js/ajax.js

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An introduction to the new functionalities are described at Wicket In Action. There is also a link to a demo application.

FAQ

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How to check whether my custom version of the backing JavaScript library (jQuery) doesn't break Wicket internals somehow ?

1. Clone Wicket

   Anchor
   wicket sources wicket sources

   from its Git repository
   git clone http://git-wip-us.apache.org/repos/asf/wicket.git
2. Open wicket-core/src/test/js/all.html and change it to point to your version of the backing library.
3. Run the non-Ajax tests by opening file:///path/to/wicket/wicket-core/src/test/js/all.html
4. To run the Ajax tests see the description at the top of wicket-core/src/test/js/ajax.js. It is required to run them through Web Server

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