Update ListView by filter input (TextField) : Wicket Apache

This is a solution about updating listView by filtering with text input.

1-First you need to create 2 classes :

I-FilterAjaxEvent II-OnChangeUpdate

I-FilterAjaxEvent

public class FilterAjaxEvent {

    private AjaxRequestTarget target;
    private String input;

    public FilterAjaxEvent(AjaxRequestTarget target, String input) {
        super();
        this.target = target;
        this.input = input;
    }


    public FilterAjaxEvent() {
        super();
    }



    public AjaxRequestTarget getTarget() {
        return target;
    }



    public void setTarget(AjaxRequestTarget target) {
        this.target = target;
    }



    public String getInput() {
        return input;
    }

    public void setInput(String input) {
        this.input = input;
    }

}

II-OnChangeUpdate

public class OnChangeUpdate extends OnChangeAjaxBehavior{

    IModel<String> filterModel;
    public OnChangeUpdate(IModel<String> filterModel) {
        super();
        this.filterModel=filterModel;
    }
    
    @Override
    protected void onUpdate(AjaxRequestTarget target) {
        String input=filterModel.getObject();
        this.getComponent().send(this.getComponent().getPage(), Broadcast.DEPTH, 
                new FilterAjaxEvent(target, input));
    }


    
    public IModel<String> getFilterModel() {
        return filterModel;
    }

    public void setFilterModel(IModel<String> filterModel) {
        this.filterModel = filterModel;
    }

    
}

2-Then in the HomePage Class you need to declare :

IModel<String> filterModel;
WebMarkupContainer wmc;
IModel<List<User>> filterList;

3-Then in the constructor of the Form Class you need to initialize :

filterModel=Model.of("");           
wmc=new WebMarkupContainer("container");

// This is myListView which I want to update 
listViewUsers=new Data("list-of-users",Model.ofList(listOfUsers));
//This is my List which I want to display after filtering  
filterList=new FiltredListModel(Model.ofList(listOfUsers));

4-In the overrided onInitialize method of the Form Class you have to add :

inputField.add(new OnChangeUpdate(filterModel));
add(inputField);
add(wmc);
wmc.add(listViewUsers);// This is myListView which I want to update                                 
wmc.setOutputMarkupId(true);

5-Create FilterListModel class to filter the first List by checking the existence of each character :

public class FiltredListModel implements IModel<List<User>> {
        private IModel<List<User>> listModel;

       public FiltredListModel(IModel<List<User>> listModel) {
            this.listModel = listModel;
        }



       @Override
        public List<User> getObject() {
            if (filterModel.getObject() != null && filterModel.getObject() != "") {
                return listModel.getObject().stream()
                        .filter(c->c.getFirstName().toUpperCase().contains(filterModel.getObject().toUpperCase()) 
                                || c.getLastName().toUpperCase().contains(filterModel.getObject().toUpperCase()))
                        .collect(Collectors.toList());
            }
            return listModel.getObject();
        }



   }

6-Finally you have to catch the event while changing the filter input, so you should create overrided method onEvent in the HomePage class :

@Override
        public void onEvent(@Nullable IEvent event) {
            super.onEvent(event);
            
            if (event.getPayload() instanceof FilterAjaxEvent) {
                FilterAjaxEvent filterAjaxEvent = (FilterAjaxEvent) event.getPayload(); 
                filterModel.setObject(filterAjaxEvent.getInput());
                String filter=filterModel.getObject();
                if(filter!=null || filter!="") {                    
                        listViewUsers.setList(filterList.getObject());                  
                }
                filterAjaxEvent.getTarget().add(get("container"));
            }
        }

Trying many solutions (OnChangeAjaxBehavior, AjaxRequestTarget ,AjaxLink) but this is the simple one and easy to understand.