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 FormGroup labelIfRegular = new FormGroup(ID_SCALAR_IF_REGULAR, select2Field);


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


        labelIfRegular.add(select2Field);


        return labelIfRegular;

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        setTitleAttribute(disableReason);
        select2Field.setEnabled(false);
    }


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

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    protected void populateItem(final ListItem<FeedbackMessage> listItem)
    {
      final FeedbackMessage message = listItem.getModelObject();
      message.markRendered();
      final Component label = newMessageDisplayComponent("message", message);
      final AttributeModifier levelModifier = AttributeModifier.append("class",
        getCSSClass(message));
      listItem.add(levelModifier);
      listItem.add(label);
    }

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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()));
    }

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


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


      public Object getObject()
      {

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  public final BookmarkablePageLink setPageMap(final IPageMap pageMap)
  {
    if (pageMap != null)
    {
      pageMapName = pageMap.getName();
      add(new AttributeModifier("target", true, new Model(pageMapName)));
    }
    return this;
  }

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          return getCSSClass(message);
        }
      };


      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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                items.remove( entry );
                target.addComponent( layerTable );
            }
        };
        link.getImage().add(new AttributeModifier("alt", true, new ParamResourceModel("AbstractLayerGroupPage.th.remove", link)));
        return link;
    }

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                        items.remove( index );
                        items.add( index-1, PositionPanel.this.entry );
                        target.addComponent( layerTable );
                    }
                };
                upLink.getImage().add(new AttributeModifier("alt", true, new ParamResourceModel("up", upLink)));
                add( upLink);
            }
            else {
                ImageAjaxLink blankLink = new ImageAjaxLink( "up", new ResourceReference( getClass(), "../../img/icons/blank.png") ) {
                    @Override
                    protected void onClick(AjaxRequestTarget target) {
                    }
                };
                blankLink.getImage().add(new AttributeModifier("alt", true, new Model("")));
                add(blankLink);
            }
            
            if ( items.indexOf( entry ) < items.size() - 1 ) {
                ImageAjaxLink downLink = new ImageAjaxLink( "down", new ResourceReference( getClass(), "../../img/icons/silk/arrow_down.png") ) {
                    @Override
                    protected void onClick(AjaxRequestTarget target) {
                        int index = items.indexOf( PositionPanel.this.entry );
                        items.remove( index );
                        items.add( index+1, PositionPanel.this.entry );
                        target.addComponent( layerTable );
                    }
                };
                downLink.getImage().add(new AttributeModifier("alt", true, new ParamResourceModel("down", downLink)));
                add( downLink);
            }
            else {
                ImageAjaxLink blankLink = new ImageAjaxLink( "down", new ResourceReference( getClass(), "../../img/icons/blank.png") ) {
                    @Override
                    protected void onClick(AjaxRequestTarget target) {
                        
                    }
                };
                blankLink.getImage().add(new AttributeModifier("alt", true, new Model("")));
                add( blankLink);
            }
        }

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