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

            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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        labelIfRegular.add(scalarName);


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

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        if(typicalLength != null && maxLength != null && typicalLength > maxLength) {
            typicalLength = maxLength;
        }
        
        if (typicalLength != null) {
            textField.add(new AttributeModifier("size", Model.of("" + typicalLength)));
        }
        
        if(maxLength != null) {
            textField.add(new AttributeModifier("maxlength", Model.of("" + maxLength)));
        }
    }

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        textField.setEnabled(true);
        setTitleAttribute("");
    }


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

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        }


        link.addOrReplace(this.label = newLabel(ID_ENTITY_TITLE, titleAbbreviated(title)));


        String entityTypeName = adapter.getSpecification().getSingularName();
        link.add(new AttributeModifier("title", entityTypeName + ": " + title));
        
        return link;
    }

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        // adding an amount because seemed to truncate in tables in certain circumstances
        final int lengthAdjust = 
                getLengthAdjustHint() != null ? getLengthAdjustHint() : 1; 
        final String dateTimePattern = converter.getDateTimePattern(getLocale());
        final int length = dateTimePattern.length() + lengthAdjust; 
        label.add(new AttributeModifier("size", Model.of("" + length)));


        compactFragment.add(label);


        scalarTypeContainer.addOrReplace(compactFragment);
        return label;

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        final FormGroup labelIfRegular = new FormGroup(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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        super.onBeforeRenderWhenDisabled(disableReason);
        syncWithInput();
        final EntityModel entityLinkModel = (EntityModel) entityLink.getModel();
        entityLinkModel.toViewMode();
        entityLink.setEnabled(false);
        entityLink.add(new AttributeModifier("title", Model.of(disableReason)));
    }

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            // show link...
            markupContainer.add(link);
            link.add(label);


            if(this.description != null) {
                label.add(new AttributeModifier("title", Model.of(description)));
            }
            if(this.blobOrClob) {
                link.add(new CssClassAppender("noVeil"));
            }
            if(this.prototype) {
                link.add(new CssClassAppender("btn-warning"));
            } else {
                link.add(new CssClassAppender("btn-default"));
            }
            if(this.cssClass != null) {
                link.add(new CssClassAppender(this.cssClass));
            }
            link.add(new CssClassAppender(this.actionIdentifier));


            String cssClassFa = getCssClassFa();
            if (Strings.isNullOrEmpty(cssClassFa)) {
                Components.permanentlyHide(link, "menuLinkFontAwesome");
            } else {
                Label dummy = new Label("menuLinkFontAwesome", "");
                dummy.add(new CssClassAppender(cssClassFa));
                link.add(dummy);
            }


            // .. and hide label
            Components.permanentlyHide(markupContainer, CssMenuItem.ID_MENU_LABEL);
            return link;
        } else {
            // hide link...
            Components.permanentlyHide(markupContainer, ID_MENU_LINK);
            // ... and show label, along with disabled reason
            label.add(new AttributeModifier("title", Model.of(this.getDisabledReason())));
            label.add(new AttributeModifier("class", Model.of("disabled")));


            markupContainer.add(label);


            return label;
        }

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    protected static void applyCssVisibility(final Component component, final boolean visible) {
        if(component == null) {
            return;
        }
        AttributeModifier modifier = visible ? new CssClassRemover(INVISIBLE_CLASS) : new CssClassAppender(INVISIBLE_CLASS);
        component.add(modifier);
    }

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