Also, if you need optrgoups and styling while needing to keep it simple, you can implement IStyledChoiceRenderer <http://apache-wicket.1842946.n4.nabble.com/FormTester-and-Select-component-td1844682.html> and extend DropDownChoice with some subtle changes.
** Martin ti 30. lokak. 2018 klo 17.04 Martin Grigorov (mgrigo...@apache.org) kirjoitti: > 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 > > > > >
