Thanks alot Ernesto, exactly what I've been wanting, the dropdown no longer
crashes when there is no data.
Cheers,
Kimotho.
On Thu, Apr 29, 2010 at 4:39 PM, Ernesto Reinaldo Barreiro <
reier...@gmail.com> wrote:
> Kimotho,
>
> Following example works.
>
> ------------------------------------
>
> package test.dataview;
>
> import java.io.Serializable;
> import java.util.ArrayList;
> import java.util.List;
>
> public class TestBean implements Serializable {
>
> private static final long serialVersionUID = 1L;
>
> public static final List<String> CATEGORIES = new
> ArrayList<String>();
>
> static {
> CATEGORIES.add("A");
> CATEGORIES.add("B");
> CATEGORIES.add("C");
> };
>
> private static List<TestBean> beans;
>
> String name;
> String category;
>
> public TestBean() {
> }
>
> public String getName() {
> return name;
> }
> public void setName(String name) {
> this.name = name;
> }
> public String getCategory() {
> return category;
> }
> public void setCategory(String category) {
> this.category = category;
> }
>
> public static List<TestBean> getBeans() {
> if(beans == null) {
> beans = new ArrayList<TestBean>();
> for(String cat: new String[]{"A","B"})
> for(int i=0; i<10; i++) {
> TestBean bean = new TestBean();
> bean.setCategory(cat);
> bean.setName("Name " + cat + i);
> beans.add(bean);
> }
> }
> return beans;
> }
> }
>
> --------------------
>
> package test.dataview;
>
> import java.util.ArrayList;
> import java.util.List;
>
> import org.apache.wicket.markup.repeater.data.IDataProvider;
> import org.apache.wicket.model.IModel;
> import org.apache.wicket.model.Model;
>
> public class TestBeanDataProvider implements IDataProvider<TestBean> {
>
> private static final long serialVersionUID = 1L;
>
> private TestBean filter;
>
> private List<TestBean> list;
>
> /**
> *
> */
> public TestBeanDataProvider() {
> }
>
> public java.util.Iterator<? extends TestBean> iterator(int first,
> int count) {
> return getList().iterator();
> };
>
> public int size() {
> return getList().size();
> }
>
> public IModel<TestBean> model(TestBean object) {
> return new Model<TestBean>(object);
> }
>
> List<TestBean> getList() {
> if(filter == null || filter.category == null) {
> return TestBean.getBeans();
> }
> if(list == null) {
> list = new ArrayList<TestBean>();
> for(TestBean bean: TestBean.getBeans()){
> if(bean.category.equals(filter.category))
> list.add(bean);
> }
> }
> return list;
> }
>
>
> public void detach() {
> list = null;
> };
>
> public TestBean getFilter() {
> return filter;
> }
>
> public void setFilter(TestBean filter) {
> this.filter = filter;
> }
> }
>
> -------------------------
>
> package test.dataview;
>
> import org.apache.wicket.ajax.AjaxRequestTarget;
> import org.apache.wicket.ajax.form.AjaxFormComponentUpdatingBehavior;
> import org.apache.wicket.markup.html.WebMarkupContainer;
> import org.apache.wicket.markup.html.basic.Label;
> import org.apache.wicket.markup.html.form.DropDownChoice;
> import org.apache.wicket.markup.html.form.Form;
> import org.apache.wicket.markup.html.panel.Panel;
> import org.apache.wicket.markup.repeater.Item;
> import org.apache.wicket.markup.repeater.data.DataView;
> import org.apache.wicket.model.Model;
>
> public class TestDataViewPanel extends Panel {
>
> private static final long serialVersionUID = 1L;
>
> private WebMarkupContainer toRepaint;
>
> private TestBean bean;
>
> private TestBeanDataProvider dataProvider;
>
> /**
> * Constructor that is invoked when page is invoked without a
> session.
> *
> * @param parameters
> * Page parameters
> */
> public TestDataViewPanel(String id) {
> super(id);
>
> bean = new TestBean();
>
> dataProvider = new TestBeanDataProvider();
>
>
> toRepaint = new WebMarkupContainer("toRepaint");
> toRepaint.setOutputMarkupId(true);
>
> add(toRepaint);
>
> Form<TestBean> form = new Form<TestBean>("form");
>
> toRepaint.add(form);
>
> DropDownChoice<String> category = new
> DropDownChoice<String>("category", new Model<String>() {
>
> private static final long serialVersionUID = 1L;
>
> @Override
> public String getObject() {
> return bean.getCategory();
> }
>
> @Override
> public void setObject(String object) {
> bean.setCategory(object);
> }
> },TestBean.CATEGORIES);
> category.add(new AjaxFormComponentUpdatingBehavior("onchange") {
>
> private static final long serialVersionUID = 1L;
>
> @Override
> protected void onUpdate(AjaxRequestTarget target) {
> dataProvider.setFilter(bean);
> target.addComponent(toRepaint);
> }
> });
>
> form.add(category);
>
> form.add(new DataView<TestBean>("rows", dataProvider) {
>
> private static final long serialVersionUID = 1L;
>
> public void populateItem(final Item<TestBean> item)
> {
> final TestBean user = item.getModelObject();
> item.add(new Label("id", user.getName()));
> }
> });
> }
>
> }
>
> --------------------------------------
>
> <html xmlns:wicket="
> http://wicket.apache.org/dtds.data/wicket-xhtml1.4-strict.dtd";>
> <body>
> <wicket:panel>
> <div wicket:id="toRepaint">
> <form wicket:id="form">
>
> <div>
> Category: <select
> wicket:id="category"></select>
> </div>
>
>
> <table>
> <tbody>
> <tr wicket:id="rows">
> <td><span
> wicket:id="id"></span></td>
> </tr>
> </tbody>
> </table>
>
> </form>
> </div>
> </wicket:panel>
> </body>
> </html>
>
> ---------------------------
>
> Is something like this what you want to achieve?
>
> Ernesto
>
>
> On Thu, Apr 29, 2010 at 2:25 PM, Ernesto Reinaldo Barreiro
> <reier...@gmail.com> wrote:
> > Just some questions... How does DataView's dataProvider get's affected
> > by the code on onUpdate? Does getDataProvider(params); recreate it?
> > Then the instance stored on DataView is different from the one you
> > retrieve with getDataProvider(params)? Why not implement a
> > SortableDataProvider, keep a local copy of it, pass it to DataView and
> > update it's sort state on the onUpdate method?
> >
> > Ernesto
> >
> > On Thu, Apr 29, 2010 at 1:51 PM, Robert Kimotho <kimot...@gmail.com>
> wrote:
> >> I have experienced the same issue, the only difference is that
> >> when there was no data in the database the dropdown crashed and could
> >> not display any
> >> values, I'm also using AjaxFormComponentUpdatingBehavior onchange
> >>
> >> Here is a section of my code:-
> >>
> >> final WebMarkupContainer commentListContainer = new
> >> WebMarkupContainer("commentListContainer");
> >> commentListContainer.setOutputMarkupId(true);
> >>
> >> final DropDownChoice<String> cats = new
> DropDownChoice<String>("cat_select",
> >> new PropertyModel<String>(new VComment(), "category")
> >> , category.getCategoriesByType("vcomment"), new
> ChoiceRenderer<String>());
> >> cats.setOutputMarkupId(true);
> >> add(cats);
> >>
> >> final AbstractDataProvider<VComment> dataProvider =
> (VCommentDataProvider)
> >> getDataProvider(params);
> >>
> >> final DataView<VComment> commentView = new
> DataView<VComment>("commentList",
> >> dataProvider, 10) {
> >>
> >> @Override
> >> protected void populateItem(Item<VComment> item) {.....}
> >> }
> >> commentListContainer.add(commentView);
> >> ........
> >> cats.add(new AjaxFormComponentUpdatingBehavior("onchange") {
> >> @Override
> >> protected void onUpdate(AjaxRequestTarget target) {
> >> params.put("cat", cats.getModelObject());
> >> getDataProvider(params);
> >> target.addComponent(commentListContainer);
> >> target.addComponent(cats);
> >> }
> >> });
> >>
> >> Kimotho.
> >>
> >> On Thu, Apr 29, 2010 at 12:42 PM, Ernesto Reinaldo Barreiro <
> >> reier...@gmail.com> wrote:
> >>> Can you post the code that was failing somewhere? Maybe someone can
> >>> spot what is happening;-)
> >>>
> >>> Best,
> >>>
> >>> Ernesto
> >>>
> >>> On Thu, Apr 29, 2010 at 11:21 AM, Reinout van Schouwen
> >>> <rein...@gmail.com> wrote:
> >>>>
> >>>> Replying to myself.
> >>>>
> >>>> I've worked around the problem by not using the AJAX method to update
> my
> >>>> DataView but by reloading the page with different pageparameters after
> a
> >>>> selection instead. Far from ideal, but the best I could come up with.
> >>>>
> >>>> Alternative solutions still welcome!
> >>>>
> >>>> Op maandag 26-04-2010 om 14:20 uur [tijdzone +0200], schreef Reinout
> van
> >>>> Schouwen:
> >>>>> I'm having trouble figuring out the following problem.
> >>>>>
> >>>>> I have a div (coupled to a WebMarkupContainer) containing a form and
> a
> >>>>> list. The list is populated with a DataView, which gets its data from
> a
> >>>>> SortableDataProvider that I have implemented according to the
> repeater
> >>>>> examples provided on wicket-library.com.
> >>>>>
> >>>>> What I want to do is to change the sort order based on a user
> selection
> >>>>> from a DropDownChoice in the form. I've used an
> >>>>> AjaxFormComponentUpdatingBehavior to listen to the dropdown's
> onchange
> >>>>> event. In the onUpdate() method I change the sortparam in the
> >>>>> dataprovider according to the selection and then add the container
> div
> >>>>> to the AjaxRequestTarget.
> >>>>>
> >>>>> What I expect to happen is that the DataView updates to reflect the
> new
> >>>>> sort order. What actually happens is that the DataView completely
> >>>>> disappears from the page! (The Wicket Ajax Debug window shows me that
> >>>>> the spot where the list should be in the HTML within the
> ajax-response
> >>>>> is indeed empty.)
> >>>>>
> >>>>> I've already set the outputmarkupid and the
> outputmarkupplaceholdertag
> >>>>> properties on the container to true but that makes no difference.
> >>>>>
> >>>>> Any ideas are appreciated!
> >>>>>
> >>>>> regards,
> >>>>>
> >>>>
> >>>>
> >>>>
> >>>> ---------------------------------------------------------------------
> >>>> To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org
> >>>> For additional commands, e-mail: users-h...@wicket.apache.org
> >>>>
> >>>>
> >>>
> >>> ---------------------------------------------------------------------
> >>> To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org
> >>> For additional commands, e-mail: users-h...@wicket.apache.org
> >>>
> >>>
> >>
> >
>
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>
>
