Question

我正在尝试获取数据＆amp;使用组件标签
显示该数据但是这些数据没有出现在页面上所有标签都在表格和行中。行在此处递增但行未获得标签

package com.cerebrum.pages;    

    import java.util.ArrayList;   

    import java.util.List;    

    import org.apache.wicket.markup.html.basic.Label;   
    import org.apache.wicket.markup.html.form.Form;
    import org.apache.wicket.markup.html.list.ListItem;
    import org.apache.wicket.markup.html.list.ListView;
    import org.apache.wicket.model.CompoundPropertyModel;
    import org.apache.wicket.model.PropertyModel;

    import com.cerebrum.common.Home;
    import com.cerebrum.hibernate.AddForumSubCategoryEntity;
    import com.cerebrum.hibernate.ForumHome;
    import com.cerebrum.pojo.ForumModel;
    public class Forum extends Home
    {
    ForumHome forumHome=new ForumHome();
    ForumModel forumModel=new ForumModel();
    List<ForumModel> listForum=new ArrayList<ForumModel>();
    public Forum()
    {
        super();
        add(new ForumForm());
    }
    class ForumForm extends Form
    {
    public ForumForm()
    {
        super("ForumForm");
        setModel(new CompoundPropertyModel(forumModel));

        List<AddForumSubCategoryEntity> list=forumHome.getAll();
        for(AddForumSubCategoryEntity addForumSubCategoryEntity:list)
        {
            listForum.add(new    
      ForumModel(addForumSubCategoryEntity.getMain_key(),
      addForumSubCategoryEntity.getDescription()));
        }

        ListView listView=new ListView("listForum",listForum) 
        {
            @Override
            protected void populateItem(ListItem item)
            {
                ForumModel model=(ForumModel)item.getDefaultModelObject();

                 Label lblMainCategory=new Label("lblMainCategory",new    
     PropertyModel(model, "lblMainCategory"));
                item.add(lblMainCategory);

                 Label lblLastSubCategory=new   
     Label("lblLastSubCategory",new PropertyModel(model, "lblLastSubCategory"));
                item.add(lblLastSubCategory);

                 Label lblTotalNoofPost=new Label("lblTotalNoofPost",new  
     PropertyModel(model, "lblTotalNoofPost"));
                item.add(lblTotalNoofPost);
            }
        };
        listView.setOutputMarkupId(true);
        add(listView);
    }
}
}

Answer 1

尽量避免创建这个中间列表“listForum”如果你的forumModel有一个方法“getListForum”会更好，所以你不需要将模型传递给ListView。（请参阅CompoundPropertyModels如何在此工作https://cwiki.apache.org/WICKET/working-with-wicket-models.html）。

在ListView中你使用的是“getDefaultModelObject（）”而不是“getModel”，然后你将它用作PropertyModel的模型，这很奇怪。

我不完全理解您的模型（ForumHome或ForumModel是否实现了IModel？），但我想这样的事情会更好：

public class Forum extends Home {

private ForumHome forumHome = new ForumHome();
private ForumModel forumModel = new ForumModel( forumHome );

public Forum() {
    super();

    add(new ForumForm("ForumForm", forumModel));
}

private static class ForumForm extends Form {
    public ForumForm(String wicketId, ForumModel forumModel) {
        super(wicketId, new CompoundPropertyModel(forumModel));

        ListView<ForumModel> listView = new ListView<ForumModel>("listForum") {

            @Override
            protected void populateItem(ListItem item) {
                IModel<ForumModel> model = item.getModel();

                item.add( new Label("lblMainCategory", new PropertyModel(model, "lblMainCategory")) );
                item.add( new Label("lblLastSubCategory", new PropertyModel(model, "lblLastSubCategory")) );
                item.add( new Label("lblTotalNoofPost", new PropertyModel(model, "lblTotalNoofPost")));

            }
        };
        listView.setOutputMarkupId(true);
        add(listView);
    }
}
}

数据来自列表但未在页面上看到

1 个答案: