Examples of org.apache.wicket.behavior.AttributeAppender

org.apache.wicket.behavior.AttributeAppender
AttributeModifier that appends the given value, rather than replace it. This is especially useful for adding CSS classes to markup elements, or adding JavaScript snippets to existing element handlers.
```
 <a href="#" wicket:id="foo" class="link" onmouseover="doSomething()"> 
```
can be modified with these AttributeAppenders:
```
 link.add(new AttributeAppender("class", Model.of("hot"))); link.add(new AttributeAppender("onmouseover", Model.of("foo();return false;")).setSeparator(";")); 
```
this will result in the following markup:
```
 <a href="#" wicket:id="foo" class="link hot" onmouseover="doSomething();foo();return false;"> 
```
@see AttributeModifier#append(String,IModel) @see AttributeModifier#append(String,Serializable) @see AttributeModifier#prepend(String,IModel) @see AttributeModifier#prepend(String,Serializable) @author Martijn Dashorst

  
  @Override
  protected void onInitialize() {
    super.onInitialize();
    
    add(new AttributeAppender("style", new LoadableDetachableModel<String>() {
      private static final long serialVersionUID = 1L;
      
      @Override
      protected String load() {
        return "width: " + width.getWidth() + "px";

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    if (HomePage.class.equals(getClass())) {
      homePageLink.setBeforeDisabledLink("");
      homePageLink.setAfterDisabledLink("");
      homePageLink.setEnabled(false);
    } else {
      homePageLink.add(new AttributeAppender("title", new ResourceModel("navigation.backToHome")));
    }
    add(homePageLink);
    
    // Bread crumb
    add(createBodyBreadCrumb("breadCrumb"));
    
    // Main navigation bar
    add(new ListView<NavigationMenuItem>("mainNav", getMainNav()) {
      private static final long serialVersionUID = -2257358650754295013L;
      
      @Override
      protected void populateItem(ListItem<NavigationMenuItem> item) {
        NavigationMenuItem navItem = item.getModelObject();
        
        AbstractLink navLink = navItem.link("navLink");
        navLink.add(new Label("navLabel", navItem.getLabelModel()));
        
        item.setVisible(navItem.isAccessible());
        if (navItem.isActive(MainTemplate.this.getFirstMenuPage())) {
          item.add(new ClassAttributeAppender("active"));
        }
        
        item.add(navLink);
        
        // Dropdown
        List<NavigationMenuItem> subMenuItems = navItem.getSubMenuItems();
        WebMarkupContainer caret = new WebMarkupContainer("caret");
        navLink.add(caret);
        WebMarkupContainer dropdownMenu = new ListView<NavigationMenuItem>("dropdownMenu", subMenuItems) {
          private static final long serialVersionUID = 1L;
          
          @Override
          protected void populateItem(ListItem<NavigationMenuItem> subMenuItem) {
            NavigationMenuItem subMenu = subMenuItem.getModelObject();
            
            AbstractLink navLink = subMenu.link("subMenuLink");
            navLink.add(new Label("subMenuLabel", subMenu.getLabelModel()));
            
            subMenuItem.setVisible(subMenu.isAccessible());
            subMenuItem.add(navLink);
          }
        };
        item.add(dropdownMenu);
        if (!subMenuItems.isEmpty()) {
          item.add(new ClassAttributeAppender("dropdown"));
          navLink.add(new ClassAttributeAppender("dropdown-toggle"));
          navLink.add(new AttributeAppender("data-toggle", "dropdown"));
          navLink.add(new AttributeModifier("href", "#"));
          caret.setVisible(true);
          dropdownMenu.setVisible(true);
        } else {
          caret.setVisible(false);

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    {
        if(null == cssClass)
        {
            return EMPTY_BEHAVIOR;
        }
        return new AttributeAppender("class", cssClass) {
            @Override
            protected String newValue(String current, String append)
            {
                if(null == current && null == append) return null;
                return super.newValue(current, append);

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   */
  public static void addRowClick(final Component row)
  {
    row.add(AttributeModifier.replace("onclick", "javascript:rowClick(this);"));
    // add marker css class for contextMenu javaScript
    row.add(new AttributeAppender("class", Model.of("withContextMenu"), " "));
  }

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    private static void applyCssVisibility(final Component component, final boolean visible) {
        final AttributeModifier modifier =  
                visible 
                    ? new AttributeModifier("class", String.valueOf(component.getMarkupAttributes().get("class")).replaceFirst(INVISIBLE_CLASS, "")) 
                    : new AttributeAppender("class", " " +
                            INVISIBLE_CLASS);
        component.add(modifier);
    }

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      }


      @Override
      protected void populateItem(ListItem<T> item) {
        if (null != getDraggableClassName()) {
          item.add(new AttributeAppender("class", new Model<String>(getDraggableClassName()), " "));
        }
        populateItemInternal(item);
      }
    });
  }

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   * @param className css class name to add to the component
   * 
   */
  public void accepts(Component component, String className) {
    assertHasDraggableBehavior(component);
    component.add(new AttributeAppender("class", new Model<String>(className), " "));
    addAcceptClass(className);
  }

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  public MyForm(String id) {
    super(id);
    add(HeaderContributor.forCss(MyForm.class, MyForm.class.getSimpleName() + ".css"));
    add(HeaderContributor.forJavaScript(MyForm.class, MyForm.class.getSimpleName() + ".js"));
    add(new AttributeAppender("onsubmit", true, new Model("return validateMyForm()"), ";"));
    add(new AjaxFormSubmitBehavior(this, "onclick") {


      private static final long serialVersionUID = 1L;


      @Override

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  protected void onBind()
  {
    Component component = getComponent();
    component.setOutputMarkupId(true);
    
    getTrigger().add(new AttributeAppender("class", true, new Model((_startShown ? FX_WIPER_SHOWN_CLASS : FX_WIPER_HIDDEN_CLASS)), " "));
        
    ToggleEvents e = getEvents();
    
    super.onBind();
  }

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  /**
   * @param event hide triggering event
   * @return behavior to hide toggled component on event
   */
  public IBehavior newHideBehavior(JavaScriptEvent event) {
    return new AttributeAppender(event.getName(), true, new PropertyModel(this, "hideScript"),";");
  }

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