AFAIK "native" jqgrid filtering functionality is not yet integrated.
Right now you will have to do filtering as with any of other Wicket
-Grid is based on IDataProvider interface so you could create an
implementation that is aware of filters (e.g. a bean containing the
information to use as filters).
-Create a form.
-Put the filter text fields and the grid inside this form
-Once form is submitted (e.g. via AJAX) reload the grid via AJAX: this
will trigger a callback to the server, how will end up using data
provider to retrieve new (filtered) data.
Hope this helps. I will see if I can find the time and add an online
example illustrating how to do this.