Examples of org.apache.wicket.AttributeModifier

org.apache.wicket.AttributeModifier
This class allows a tag attribute of a component to be modified dynamically with a value obtained from a model object. This concept can be used to programmatically alter the attributes of components, overriding the values specified in the markup. The two primary uses of this class are to allow overriding of markup attributes based on business logic and to support dynamic localization. The replacement occurs as the component tag is rendered to the response.
The attribute whose value is to be modified must be given on construction of the instance of this class along with the model containing the value to replace with.
If an attribute is not in the markup, this modifier will add an attribute.
Instances of this class should be added to components via the {@link Component#add(Behavior)}method after the component has been constructed.
It is possible to create new subclasses of {@code AttributeModifier} by overriding the{@link #newValue(String,String)} method. For example, you could create an{@code AttributeModifier} subclass which appends the replacement value like this:
```
 new AttributeModifier("myAttribute", model) { protected String newValue(final String currentValue, final String replacementValue) { return currentValue + replacementValue; } }; 
```
@author Chris Turner @author Eelco Hillenius @author Jonathan Locke @author Martijn Dashorst @author Ralf Ebert

      };


      final FeedbackMessage message = listItem.getModelObject();
      message.markRendered();
      final Component label = newMessageDisplayComponent("message", message);
      final AttributeModifier levelModifier = new AttributeModifier("class", replacementModel);
      label.add(levelModifier);
      listItem.add(levelModifier);
      listItem.add(label);
    }

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      protected void onModelChanging()
      {
        AjaxEditableMultiLineLabel.this.onModelChanging();
      }
    };
    editor.add(new AttributeModifier("rows", new AbstractReadOnlyModel<Integer>()
    {
      private static final long serialVersionUID = 1L;


      @Override
      public Integer getObject()
      {
        return rows;
      }
    }));
    editor.add(new AttributeModifier("cols", new AbstractReadOnlyModel<Integer>()
    {
      private static final long serialVersionUID = 1L;


      @Override
      public Integer getObject()

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    parameters.set("cto", continueTo);


    CharSequence url = urlFor(new BookmarkablePageRequestHandler(new PageProvider(
      BrowserInfoPage.class, parameters)));


    meta.add(new AttributeModifier("content", true, new Model<String>("0; url=" + url)));
    add(meta);
    WebMarkupContainer link = new WebMarkupContainer("link");
    link.add(new AttributeModifier("href", true, new Model<Serializable>((Serializable)url)));
    add(link);
    add(new BrowserInfoForm("postback")
    {
      private static final long serialVersionUID = 1L;

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   */
  public ClientSideImageMap(String id, Image image)
  {
    super(id);
    setOutputMarkupId(true);
    add(new AttributeModifier("name", true, new PropertyModel<String>(this, "markupId")));
    image.add(new AttributeModifier("usemap", true, new UsemapModel()));


    areas = new RepeatingView("area");
    add(areas);
  }

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    choice = newDropDownChoice("filter", model, choices, renderer);


    if (autoSubmit)
    {
      choice.add(new AttributeModifier("onchange", true, new Model<String>(
        "this.form.submit();")));
    }
    enableFocusTracking(choice);


    add(choice);

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    // root element)
    setTransformBodyOnly(false);


    // Make the XSLT processor happy and allow him to handle the wicket
    // tags and attributes which are in the wicket namespace
    add(new AttributeModifier("xmlns:wicket", true, new Model<String>(
      "http://wicket.apache.org/dtds.data/wicket-xhtml1.3-strict.dtd")));
  }

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    });


    // add the new tabbed panel, attribute modifier only used to switch
    // between different css variations
    add(new TabbedPanel("tabs", tabs).add(new AttributeModifier("class", true,
      TabbedPanelPage.this.getDefaultModel())));


  }

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            labelIfRegular.add(new CssClassAppender("mandatory"));
        }


        final String describedAs = getModel().getDescribedAs();
        if(describedAs != null) {
            labelIfRegular.add(new AttributeModifier("title", Model.of(describedAs)));
        }
        
        final Label scalarName = new Label(ID_SCALAR_NAME, getRendering().getLabelCaption(checkBox));
        labelIfRegular.add(scalarName);

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        entityLink.syncVisibilityAndUsability();
    }


    private void setTitleAttribute(final String titleAttribute) {
        entityLink.add(new AttributeModifier("title", Model.of(titleAttribute)));
    }

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        final FormComponentLabel labelIfRegular = new FormComponentLabel(ID_SCALAR_IF_REGULAR, entityLink);
        labelIfRegular.add(entityLink);
        
        final String describedAs = getModel().getDescribedAs();
        if(describedAs != null) {
            labelIfRegular.add(new AttributeModifier("title", Model.of(describedAs)));
        }
        
        final Label scalarName = new Label(ID_SCALAR_NAME, getRendering().getLabelCaption(entityLink));
        labelIfRegular.add(scalarName);

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