wicket,在每次调用RepeatingView时构建
我已从Wicket站点复制了支持在运行时添加项的ListEditor组件:wicket,在每次调用RepeatingView时构建,wicket,wicket-1.6,Wicket,Wicket 1.6,我已从Wicket站点复制了支持在运行时添加项的ListEditor组件: public abstract class ListEditor<T> extends RepeatingView implements IFormModelUpdateListener { List<T> items; public ListEditor(String id, IModel<List<T>> model) { super(id, model);
public abstract class ListEditor<T> extends RepeatingView implements IFormModelUpdateListener {
List<T> items;
public ListEditor(String id, IModel<List<T>> model) {
super(id, model);
setOutputMarkupId(true);
}
protected abstract void onPopulateItem(ListItem<T> item);
public void addItem(T value) {
items.add(value);
ListItem<T> item = new ListItem<T>(newChildId(), items.size() - 1);
add(item);
onPopulateItem(item);
}
@Override
protected void onBeforeRender() {
if (!hasBeenRendered()) {
List<T> modelObject = getModelObject();
if (modelObject != null) {
items = new ArrayList<T>(modelObject);
for (int i = 0; i < items.size(); i++) {
ListItem<T> li = new ListItem<T>(newChildId(), i);
add(li);
onPopulateItem(li);
}
} else {
items = new ArrayList<T>();
}
}
super.onBeforeRender();
}
@Override
public void updateModel() {
setModelObject(items);
}
/**
* Indicates whether or not the item can be removed, usually by the use of
* {@link RemoveButton}
*
* @param items
* @param item
* @return
*/
public boolean canRemove(List<T> items, T item) {
return true;
}
@SuppressWarnings("unchecked")
final boolean checkRemove(ListItem<?> item) {
List<T> list = Collections.unmodifiableList(items);
ListItem<T> li = (ListItem<T>) item;
return canRemove(list, li.getModelObject());
}
/**
* Gets model
*
* @return model
*/
@SuppressWarnings("unchecked")
public final IModel<List<T>> getModel() {
return (IModel<List<T>>) getDefaultModel();
}
/**
* Sets model
*
* @param model
*/
public final void setModel(IModel<List<T>> model) {
setDefaultModel(model);
}
/**
* Gets model object
*
* @return model object
*/
@SuppressWarnings("unchecked")
public final List<T> getModelObject() {
return (List<T>) getDefaultModelObject();
}
/**
* Sets model object
*
* @param object
*/
public final void setModelObject(List<T> object) {
setDefaultModelObject(object);
}
}
问题:我希望每次调用refresh时都从零开始构建组件,所以当有人添加项时,我如何实现这一点 您还可以使用Ajax调用将项目添加到普通的ListView中。只需确保要添加的项通常使用ajaxcall中的LoadableDetachableModel添加到基础列表中,然后通过将其添加到AjaxRequestTarget并将setReuseItems设置为false刷新整个listview即可 比如:
LoadableDetachableModel<List<MyObject>> myListModel = new LoadableDetachableModel<List<MyObject>>()
{
public List<MyObject> load()
{
return generateListDynamically(); //or whatever method you use to retrieve the list including the items you've added
}
}
ListView<MyObject> items = new ListView("items", myListModel);
items.setReuseItems(false);
add(items);
//A method you call in the onclick of the link that adds or removes an item.
public void onItemAdd(AjaxRequestTarget target)
{
//should be accessible, maybe make it a member of the page or something
target.add(items);
}
为什么不使用ListView呢?在上面显示的Puve中,我可以在ajax上添加和删除项目