Everytime I click on the “Add”-Button in the OperationsLayoutFactory, the Page is refreshed and empty after that.
I only want to insert the “textfieldName” into the Div in page1 of the tabs.
I can click Back in the Browser when i see the empty page. After that, its added correctly.
How can I avoid the loading of the new, empty page? Is there something wrong with my Routes?
Before Add-Click
[![Before “Add”-Click]
[1]
][1]
After Add-Click and Browser-Back
[![After Add-Click and Browser-Back]
[2]
][2]
**My Route Layout**
-UniversMainUI
--OperationsLayout (Route Name: Operations), Parent: UniversMainUI
---AddUniversitaetLayout (Route Name: justtest), Parent: OperationsLayoutFactory
UniversMainUI
@Route("ui")
@RouteAlias("")
@PageTitle("U N I V E R S")
@Theme(value = Lumo.class, variant = Lumo.DARK)
public class UniversMainUI extends Composite<VerticalLayout> implements HasComponents, RouterLayout {
@Autowired
private UniversLogoLayoutFactory universLogoLayoutFactory;
@Autowired
private UniversMenuFactory universMenuFactory;
Component logo;
Component menueLinks;
Component rechtsDatenfeld;
Component studentRemove;
private Div childWrapper = new Div();
public UniversMainUI() {
}
@PostConstruct // autowired-Components sind erst nach Konstruktordurchlauf verfuegbar
private void init() {
logo = universLogoLayoutFactory.createComponent();
add(logo);
menueLinks = universMenuFactory.createComponent();
add(menueLinks);
Stream<Component> children = menueLinks.getChildren();
List<Component> listchildren = children.collect(Collectors.toList());
ArrayList<Component> arraylistchildren = new ArrayList<Component>(listchildren);
HorizontalLayout h1 = new HorizontalLayout(menueLinks, childWrapper);
h1.setHeight("75%");
h1.setWidth("100%");
getContent().setSizeFull(); // wichtig fuer Ermoeglichung prozentualer Angabe der Komponentenausmasse
add(h1);
for (Component c : arraylistchildren) {
if (c.getId().get().equals("menueTreeGrid")) // auf Werte vom Typ Optional kann mittels name.get zugegriffen werden
{
TreeGrid<Ebene> myTreeGrid = (TreeGrid<Ebene>) arraylistchildren.get(0);
myTreeGrid.addItemClickListener(event -> {
if (event.getItem().getBezeichnung().equals(LangStrings.MENU_ADD_STUDENT.toString())) {
myTreeGrid.getUI().ifPresent(ui -> ui.navigate("StudentLayout"));
}
if (event.getItem().getBezeichnung().equals(LangStrings.MENU_REMOVE_STUDENT.toString())) {
myTreeGrid.getUI().ifPresent(ui -> ui.navigate("DeleteStudent"));
}
if (event.getItem().getBezeichnung().equals(LangStrings.MENU_OPERATIONS.toString())) {
myTreeGrid.getUI().ifPresent(ui -> ui.navigate("Operations"));
}
;
});
}
}
}
@Override
public void showRouterLayoutContent(HasElement content) {
childWrapper.getElement().appendChild(content.getElement());
}
}
OperationsLayout
@org.springframework.stereotype.Component // spring-Component und NICHT vaadin-component (aufpassen bei Import)
public class OperationsLayoutFactory extends Composite<VerticalLayout> implements
UIComponentBuilder,RouterLayout {
@Autowired
AddUniversitaetLayoutFactory addUniversitaetLayoutFactory;
Div childChildWrapper=new Div();
@ParentLayout(UniversMainUI.class)
@Route(value = "Operations", layout = UniversMainUI.class)
private class OperationsLayout extends VerticalLayout {
Tab tab1;
Tab tab2;
Tab tab3;
Div page1;
Div page2;
Div page3;
Map<Tab, Component> tabsToPages;
Tabs tabs;
Div pages;
Button addButton;
public OperationsLayout() {
init().layout();
}
public OperationsLayout init() {
tab1 = new Tab("Hinzufuegen");
tab2 = new Tab("Alle Anzeigen");
tab3 = new Tab("Statistiken");
page1 = new Div();
page2 = new Div();
page3 = new Div();
tabsToPages = new HashMap<>();
tabs = new Tabs(tab1, tab2, tab3);
pages = new Div(page1, page2, page3);
addButton=new Button("Add");
addButton.addClickListener(e -> {
page1.getUI().ifPresent(ui -> ui.navigate("justtest"));
});
return this;
}
public OperationsLayout layout() {
page1.setText("Erste Seite");
page1.add(addButton);
page2.setText("Zweite Seite");
page2.setVisible(false);
page3.setText("Dritte Seite");
page3.setVisible(false);
tabsToPages.put(tab1, page1);
tabsToPages.put(tab2, page2);
tabsToPages.put(tab3, page3);
pages.setWidth("100%"); // Nutzung verfuegbarer Breite fuer Tabinhalte
tabs.setWidth("100%");
tabs.setFlexGrowForEnclosedTabs(1);
Set<Component> gezeigteSeiten = Stream.of(page1).collect(Collectors.toSet());
tabs.addSelectedChangeListener(event -> {
gezeigteSeiten.forEach(page -> page.setVisible(false));
gezeigteSeiten.clear();
Component ausgewaehlteSeite = tabsToPages.get(tabs.getSelectedTab());
ausgewaehlteSeite.setVisible(true);
gezeigteSeiten.add(ausgewaehlteSeite);
});
HorizontalLayout h1=new HorizontalLayout();
childChildWrapper.setWidth("100%");
childChildWrapper.setHeight("100%");
h1.add(childChildWrapper);
page1.add(h1);
setSizeFull();
add(tabs);
add(pages);
return this;
}
}
@Override
public com.vaadin.flow.component.Component createComponent() {
return new OperationsLayout().init().layout();
}
@Override
public void showRouterLayoutContent(HasElement content) {
System.out.println("zu childchildwrapper: "+childChildWrapper.getElement()+" wird jetzt hinzugefuegt: "+content.getElement());
childChildWrapper.getElement().appendChild(content.getElement());
}
}
AddUniversitaetLayout
@org.springframework.stereotype.Component // spring-Component und NICHT vaadin-component (aufpassen bei Import)
public class justTest extends Composite<VerticalLayout> implements UIComponentBuilder { //TODO: Listener einbauen
@Route(value="justtest", layout=OperationsLayoutFactory.class)
private class AddUniversitaetLayout extends Composite<VerticalLayout>{
TextField textfieldName;
public AddUniversitaetLayout() {
// TODO Auto-generated constructor stub
init().bind().layout();
}
public AddUniversitaetLayout init() {
textfieldName=new TextField("Test erfolgreich!");
return this;
}
public AddUniversitaetLayout bind() {
return this;
}
public AddUniversitaetLayout layout() {
getContent().add(textfieldName);
return this;
}
}
@Override
public com.vaadin.flow.component.Component createComponent() {
return new AddUniversitaetLayout().init().bind().layout();
}
[1]
: https://i.stack.imgur.com/ZbsDm.jpg
[2]
: https://i.stack.imgur.com/6pizP.jpg
