Hi, DropDownChoice component should be used when you have a list of objects which you want to render in an HTML select element without fancy things like option grouping and styling. If you need to do grouping and/or styling then you need to use Select and add SelectOption for each of your objects. See https://github.com/apache/wicket/blob/master/wicket-examples/src/main/java/org/apache/wicket/examples/compref/SelectPage.java for an example. The grouping is only in the HTML in this example ( https://github.com/apache/wicket/blob/master/wicket-examples/src/main/java/org/apache/wicket/examples/compref/SelectPage.html#L23) but you can use WebMarkupContainer on the optgroup elements to set its attributes dynamically.
On Tue, Oct 30, 2018 at 4:49 PM Claudia Hirt <hirt-clau...@gmx.de> wrote: > Hi, > I use select to create a selectbox containing optgroups which is not > possible with abstractchoice as far as i know. And i want to also use > choice renderer for this “groupselectbox component” to have the same > behaviour as in abstract choice. > Maybe I’m wrong with the whole concept. What is your recommendation for > how to create a group selectbox? > > Best regards, > Claudia > > > Am 30.10.2018 um 12:02 schrieb Martin Grigorov <mgrigo...@apache.org>: > > > > Hi Claudia, > > > > I do not quite understand your question/suggestion. > > > > IChoiceRenderer is used by AbstractChoice and its specializations. > > "T object" is your type, so you should decide how to construct a stable > id > > out of it. In case you cannot get such id then you may use the passed > > index, but in this case you have to make sure that the same index is > always > > used for this object instance (as the javadoc explains). > > > > Wicket-Extensions' Select doesn't use IChoiceRenderer at all, so I don't > > see what is the relation to the first part of your question. > > > >> On Fri, Oct 26, 2018 at 2:54 PM Claudia Hirt <hirt-clau...@gmx.de> > wrote: > >> > >> Hi all, > >> > >> i have a question about IChoiceRenderer used for Selectboxes. > >> > >> There is a method String getIdValue(Tobject, int index) to get the > unique > >> id value of an option object. > >> The javadoc says the following: > >> > >> "This method is called to get the id value of an object (used as the > value > >> attribute of a choice element) The id can be extracted from the object > like > >> a primary key, or if the list is stable you could just return a > toString of > >> the index." > >> > >> I wonder if it's a good idea to have the object and the index as > >> parameters in this method. If the id value should be kind of a primary > key > >> of the object, it should not depend on the index, which has nothing to > do > >> with the object. > >> I cannot use this method in my case to check if an object which is not > in > >> the choices list has the same id value than the selected one in my > >> selectbox. I tried to do this with wicket-extensions Select, which does > not > >> have a choice renderer by default and I only have the object in > >> isSelectedmethod of Select, but not the index. > >> > >> Best regards, > >> Claudia > >> > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org > For additional commands, e-mail: users-h...@wicket.apache.org > >
