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

       */
      public ButtonLink(String id)
      {
        super(id);
        count3 = new ClickCount();
        add(new AttributeModifier("value", new Model<String>()
        {
          @Override
          public String getObject()
          {
            // we just replace the whole string. You could use

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       */
      public ButtonLink(String id)
      {
        super(id);
        count3 = new ClickCount();
        add(new AttributeModifier("value", new Model<String>()
        {
          @Override
          public String getObject()
          {
            // we just replace the whole string. You could use

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    // get the url to that page
    CharSequence leftFrameSrc = RequestCycle.get().urlFor(leftFrame);
    // and create a simple component that modifies it's src attribute to
    // hold the url to that frame
    WebComponent leftFrameTag = new WebComponent("leftFrame");
    leftFrameTag.add(new AttributeModifier("src", new Model((Serializable)leftFrameSrc)));
    add(leftFrameTag);


    // make a simple component for the right frame tag
    WebComponent rightFrameTag = new WebComponent("rightFrame");
    // and this time, set a model which retrieves the url to the currently
    // set frame class in the frame target
    rightFrameTag.add(new AttributeModifier("src", new FrameModel()));
    add(rightFrameTag);
  }

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

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        item.add(new Label("firstname", contact.getFirstName()));
        item.add(new Label("lastname", contact.getLastName()));
        item.add(new Label("homephone", contact.getHomePhone()));
        item.add(new Label("cellphone", contact.getCellPhone()));


        item.add(new AttributeModifier("class", true, new AbstractReadOnlyModel<String>()
        {
          private static final long serialVersionUID = 1L;


          @Override
          public String getObject()

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    super(table);
    this.table = table;


    WebMarkupContainer span = new WebMarkupContainer("span");
    add(span);
    span.add(new AttributeModifier("colspan", true, new Model<String>(
      String.valueOf(table.getColumns().length))));


    span.add(newPagingNavigator("navigator", table));
    span.add(newNavigatorLabel("navigatorLabel", table));
  }

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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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    super(table);
    this.table = table;


    WebMarkupContainer span = new WebMarkupContainer("span");
    add(span);
    span.add(new AttributeModifier("colspan", true, new Model<String>(
      String.valueOf(table.getColumns().length))));


    span.add(newPagingNavigator("navigator", table));
    span.add(newNavigatorLabel("navigatorLabel", table));
  }

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      writingStyles = getLocalizer().getString("noWritingStyles", this);
    }


    Label writingStylesLabel = new Label("writingStyles", writingStyles);


    final AttributeModifier italic = new AttributeModifier("class", new Model<String>("italic"));
    italic.setEnabled(!hasStyles);


    add(writingStylesLabel.add(italic));
    add(EditBook.link("edit", book.getId()));
  }

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