Actually, as you said, when I add new bounded object to the collection
new listChoice has been added to page, but whenever I tried to remove
object from collection, related listChoice is not being removed from
page. I have added wrapping container and I specified as target
component to listChoice's onchange action. As result, I have added
"item.remove(listChoice);" to code but this time, exception raised.
I think I am using ListView wrongly, main problem looks like ListView
related model object. This is my current markup file content.
<body>
<form wicket:id="form">
<table wicket:id="categoryContainer">
<tr>
<td wicket:id="categoryList">
<select wicket:id="category"/>
</td>
</tr>
</table>
<input type="submit" value="Submit"/>
</form>
</body>
On Sun, Jul 31, 2011 at 11:02 PM, Christian Huber <[email protected]> wrote:
> Hi,
>
> this is just a wild guess but in your code you have line that calls
> "item.remove(listChoice);" under certain conditions and the listChoice
> instance is bound to the category identifier which does not seem right to
> me.
>
> As far as I understand ListViews the associated markup block is created for
> each item. If you remove the listChoice from an item then Wicket has no
> object to associate the markup with. So I think you cannot remove the choice
> that way.
>
> I have a similar use case where I also add and remove objects to and from
> ListViews via Ajax and it was sufficient to just remove the object from the
> collection that the ListView relies on and add the wrappign container to the
> ajax target.
>
> Since the listChoice is the only thing you add to an item I figure that
> could also be feasible for your case but as said before this is just a
> hunch.
>
> HTH, Chris
>
> --
> The Sanity Resort <http://sanityresort.blogspot.com/>
>
> Am 31.07.2011 21:06, schrieb ramazan pekin:
>>
>> Hi to everyone,
>>
>> I am trying to generate dynamic form elements. I need to add and
>> remove some components dynamically. I have added listChoice component
>> succesfuly whenever user select a listChoice item, but when I tried to
>> remove listChoice component, I received an error like that:
>>
>>
>> org.apache.wicket.DefaultExceptionMapper.internalMap(DefaultExceptionMapper.java:102)
>> - Unexpected error occurred
>> org.apache.wicket.markup.MarkupException: Unable to find component
>> with id 'category' in [ListItem [Component id = 1]]. This means that
>> you declared wicket:id=category in your markup, but that you either
>> did not add the component to your page at all, or that the hierarchy
>> does not match.
>> .....Page.html
>> <td wicket:id="categoryList">
>>
>> <select wicket:id="category"></select>
>> </td>, index = 2, current = '<select
>> wicket:id="category">' (line 16, column 18)]
>> at
>> org.apache.wicket.markup.MarkupStream.throwMarkupException(MarkupStream.java:536)
>>
>>
>> This is form code:
>>
>> public class DynamicForm extends Form {
>>
>> private static final long serialVersionUID = 1L;
>>
>> final ListView<CategoryModel> listView;
>>
>> private List<CategoryModel> categories;
>>
>> public DynamicForm(String id) {
>> super(id);
>>
>> categories = new ArrayList<CategoryModel>();
>> categories.add(new CategoryModel(masterCategories));
>>
>> final WebMarkupContainer listContainer = new
>> WebMarkupContainer("categoryContainer");
>> listView = new ListView<CategoryModel>("categoryList", categories) {
>>
>> private static final long serialVersionUID = 1L;
>>
>> @Override
>> protected void populateItem(final ListItem<CategoryModel> item) {
>> final CategoryModel category = item.getModelObject();
>> ListChoice<OmCategory> listChoice = new ListChoice<OmCategory>(
>> "category",
>> new PropertyModel<OmCategory>(category, "selectedCategory"),
>> masterCategories,
>> new IChoiceRenderer<OmCategory>() {
>> private static final long serialVersionUID = 1L;
>>
>> public Object getDisplayValue(OmCategory omCategory) {
>> return omCategory.getCategoryCode().getLocalized();
>> }
>>
>> public String getIdValue(OmCategory omCategory, int index) {
>> return omCategory.getRowId();
>> }
>> }
>> );
>> listChoice.add(new AjaxFormComponentUpdatingBehavior("onchange") {
>> private static final long serialVersionUID =
>> 5417882427051940952L;
>>
>> @Override
>> protected void onUpdate(AjaxRequestTarget target) {
>> if(categories.size()> 1&& (categories.indexOf(category)
>> + 1) != categories.size()) {
>> categories = new
>> ArrayList<CategoryModel>(categories.subList(0,
>> (categories.indexOf(category) + 1)));
>> }
>> categories.add(new CategoryModel(masterCategories));
>> target.add(listContainer);
>> }
>> });
>> if(categories.indexOf(item.getModelObject()) != -1) {
>> item.add(listChoice);
>> } else {
>> item.remove(listChoice);
>> }
>> }
>> };
>> listView.setOutputMarkupId(true);
>> listContainer.add(listView);
>> listContainer.setOutputMarkupId(true);
>> add(listContainer);
>> }
>> }
>>
>>
>> First time I am developing with wicket, and maybe I use wrongly. I'm
>> new and any feedback is appreciated... Sorry for my english :)
>>
>> Br.
>> Ramazan
>>
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