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

                } else if(property == TYPE) {
                    if(layer != null) {
                        ResourceReference icon = icons.getSpecificLayerIcon(layer);
                        Fragment f = new Fragment(id, "iconFragment", ImportSummaryPage.this);
                        Image image = new Image("icon", icon);
                        image.add(new AttributeModifier("title", true, new Model(getTypeTooltip(layer))));
            f.add(image);
                        return f;
                    } else {
                        return new Label(id, "");
                    }

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        else
            name =  layerSummary.getLayerName();
        link.add(new Label("name", name));
        
        // also set a tooltip explaining what this action does
        link.add(new AttributeModifier("title", true, new ParamResourceModel("edit", this, name)));
        
        return link;
    }

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        add(new Label("project", importer.getProject()));
        add(info = new WebMarkupContainer("info"));
        info.setOutputMarkupId(true);
        info.add(bar = new Label("bar", "0"));
        widthModel = new Model("width: 0%;");
        bar.add(new AttributeModifier("style", widthModel));
        info.add(percentage = new Label("percentage", "0"));
        info.add(currentFile = new Label("currentFile", ""));
        info.add(new AjaxLink("cancel") {


            @Override

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                item.add(new Label("category.header", new StringResourceModel(category.getNameKey(), (Component) null, null)));
                item.add(new ListView("category.links", links.get(category)){
                    public void populateItem(ListItem item){
                        MenuPageInfo info = (MenuPageInfo)item.getModelObject();
                        BookmarkablePageLink link = new BookmarkablePageLink("link", info.getComponentClass());
                        link.add(new AttributeModifier("title", true, new StringResourceModel(info.getDescriptionKey(), (Component) null, null)));
                        link.add(new Label("link.label", new StringResourceModel(info.getTitleKey(), (Component) null, null)));
                        Image image;
                        if(info.getIcon() != null) {
                            image = new Image("link.icon", new ResourceReference(info.getComponentClass(), info.getIcon()));
                        } else {
                            image = new Image("link.icon", new ResourceReference(GeoServerBasePage.class, "img/icons/silk/wrench.png"));
                        }
                        image.add(new AttributeModifier("alt", true, new ParamResourceModel(info.getTitleKey(), null)));
                        link.add(image);
                        item.add(link);
                    }
                });
            }
        });


        add(new ListView("standalone", standalone){
                    public void populateItem(ListItem item){
                        MenuPageInfo info = (MenuPageInfo)item.getModelObject();
                        BookmarkablePageLink link = new BookmarkablePageLink("link", info.getComponentClass());
                        link.add(new AttributeModifier("title", true, new StringResourceModel(info.getDescriptionKey(), (Component) null, null)));
                        link.add(new Label("link.label", new StringResourceModel(info.getTitleKey(), (Component) null, null)));
                        item.add(link);
                        
                    }
                }

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                + "REQUEST=GetLegendGraphic&VERSION=1.0.0&FORMAT=image/png&WIDTH=20&HEIGHT=20&STRICT=false&style=";
        StyleInfo styleInfo = (StyleInfo) styleInfoModel.getObject();
        if (styleInfo != null) {
            String style = styleInfo.getName();
            url += style;
            image.add(new AttributeModifier("src", new Model(url)));
            if (target != null) {
                target.addComponent(image);
            }
        }
    }

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        for (int i = 0; i < wmsOutputFormats.size(); i++) {
            String wmsOutputFormat = wmsOutputFormats.get(i);
            String label = translateFormat("format.wms.", wmsOutputFormat);
            // build option with text and value
            Label format = new Label(i + "", label);
            format.add(new AttributeModifier("value", true, new Model(wmsOutputFormat)));
            wmsFormats.add(format);
        }
        menu.add(wmsFormats);
        
        // the vector ones, it depends, we might have to hide them
        boolean vector = layer.groupInfo == null && layer.layerInfo.getType() != LayerInfo.Type.RASTER;
        WebMarkupContainer wfsFormatsGroup = new WebMarkupContainer("wfs");
        RepeatingView wfsFormats = new RepeatingView("wfsFormats");
        if(vector) {
            for (int i = 0; i < wfsOutputFormats.size(); i++) {
                String wfsOutputFormat = wfsOutputFormats.get(i);
                String label = translateFormat("format.wfs.", wfsOutputFormat);
                // build option with text and value
                Label format = new Label(i + "", label);
                format.add(new AttributeModifier("value", true, new Model(wfsOutputFormat)));
                wfsFormats.add(format);
            }
        }
        wfsFormatsGroup.add(wfsFormats);
        menu.add(wfsFormatsGroup);

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                link.add(new Label("resourcelabel", dataStoreFactoryName));
                item.add(link);
                item.add(new Label("resourceDescription", description));
                Image icon = new Image("storeIcon", icons.getStoreIcon(factory.getClass()));
                // TODO: icons could provide a description too to be used in alt=...
                icon.add(new AttributeModifier("alt", true, new Model("")));
                item.add(icon);
            }
        };


        final List<String> sortedCoverageNames = new ArrayList<String>();
        sortedCoverageNames.addAll(getAvailableCoverageStores().keySet());
        Collections.sort(sortedCoverageNames);


        final ListView coverageLinks = new ListView("rasterResources", sortedCoverageNames) {
            @Override
            protected void populateItem(ListItem item) {
                final String coverageFactoryName = item.getModelObjectAsString();
                final Map<String, Format> coverages = getAvailableCoverageStores();
                Format format = coverages.get(coverageFactoryName);
                final String description = format.getDescription();
                SubmitLink link;
                link = new SubmitLink("resourcelink") {
                    @Override
                    public void onSubmit() {
                        setResponsePage(new CoverageStoreNewPage(coverageFactoryName));
                    }
                };
                link.setEnabled(thereAreWorkspaces);
                link.add(new Label("resourcelabel", coverageFactoryName));
                item.add(link);
                item.add(new Label("resourceDescription", description));
                Image icon = new Image("storeIcon", icons.getStoreIcon(format.getClass()));
                // TODO: icons could provide a description too to be used in alt=...
                icon.add(new AttributeModifier("alt", true, new Model("")));
                item.add(icon);
            }
        };


        storeForm.add(dataStoreLinks);

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  /** Tests simple behavior */
  @Test
  public void simple()
  {
    MyPage page = new MyPage();
    page.getContainer().add(new AttributeModifier("class", "border"));
    tester.startPage(page);


    assertTrue(tester.getLastResponseAsString().contains("class=\"border\""));
  }

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   * Tests the fact that url-behavior indexes do not change even if behaviors are removed/added
   */
  @Test
  public void urlIndexRendering()
  {
    Behavior border = new AttributeModifier("class", "border");
    Behavior border2 = new AttributeModifier("class2", "border");
    Behavior auto = new AttributeModifier("autocomplete", "off");
    Behavior auto2 = new AttributeModifier("autocomplete2", "off");
    Behavior link = new LinkBehavior("href");
    Behavior link2 = new LinkBehavior("onclick");


    MyPage page = new MyPage();

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   * Tests that removal of behaviors properly cleans up the data array
   */
  @Test
  public void behaviorDataArrayCleanup()
  {
    Behavior border = new AttributeModifier("class", "border");
    Behavior border2 = new AttributeModifier("class2", "border");
    Behavior auto = new AttributeModifier("autocomplete", "off");
    Behavior auto2 = new AttributeModifier("autocomplete2", "off");
    Behavior link = new LinkBehavior("href");
    Behavior link2 = new LinkBehavior("onclick");


    MyPage page = new MyPage();
    page.getContainer().add(border, auto, link, border2, link2, auto2);

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