org.apache.wicket.behavior

Class AttributeAppender

java.lang.Object

org.apache.wicket.behavior.Behavior

org.apache.wicket.AttributeModifier

org.apache.wicket.behavior.AttributeAppender

All Implemented Interfaces:

Serializable, IComponentAwareEventSink, IComponentAwareHeaderContributor, IClusterable

public class AttributeAppender
extends AttributeModifier

AttributeModifier that appends the given value, rather than replace it. This is especially useful for adding CSS classes to markup elements, or adding JavaScript snippets to existing element handlers.

     <a href="#" wicket:id="foo" class="link" onmouseover="doSomething()">
 

can be modified with these AttributeAppenders:

 link.add(new AttributeAppender("class", Model.of("hot")));
 link.add(new AttributeAppender("onmouseover", Model.of("foo();return false;")).setSeparator(";"));
 

this will result in the following markup:

     <a href="#" wicket:id="foo" class="link hot" onmouseover="doSomething();foo();return false;">
 

Author:

Martijn Dashorst

See Also:

AttributeModifier.append(String, IModel), AttributeModifier.append(String, Serializable), AttributeModifier.prepend(String, IModel), AttributeModifier.prepend(String, Serializable), Serialized Form

Field Summary

Fields inherited from class org.apache.wicket.AttributeModifier

VALUELESS_ATTRIBUTE_ADD, VALUELESS_ATTRIBUTE_REMOVE

Constructor Summary

Constructors

Constructor and Description
AttributeAppender(String attribute, IModel<?> replaceModel) Creates an attribute modifier that concatenates the replaceModel to the attribute's current value, optionally separated by the separator.
AttributeAppender(String attribute, IModel<?> appendModel, String separator) Creates an AttributeModifier that appends the appendModel's value to the current value of the attribute, and will add the attribute when it is not there already.
AttributeAppender(String attribute, Serializable value) Creates an attribute modifier that appends the value to the attribute's current value, optionally separated by the separator.

Method Summary

Methods

Modifier and Type	Method and Description
String	getSeparator() Gets the separator used by attribute appenders and prependers.
protected String	newValue(String currentValue, String appendValue) Gets the value that should replace the current attribute value.
AttributeAppender	setSeparator(String separator) Sets the separator used by attribute appenders and prependers.
String	toString()

Methods inherited from class org.apache.wicket.AttributeModifier

append, append, detach, getAttribute, getReplaceModel, onComponentTag, prepend, prepend, remove, replace, replace, replaceAttributeValue

Methods inherited from class org.apache.wicket.behavior.Behavior

afterRender, beforeRender, bind, canCallListenerInterface, getStatelessHint, isEnabled, isTemporary, onConfigure, onEvent, onException, onRemove, renderHead, unbind

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

AttributeAppender

public AttributeAppender(String attribute,
                 IModel<?> replaceModel)

Creates an attribute modifier that concatenates the replaceModel to the attribute's current value, optionally separated by the separator.

Parameters:

attribute -

replaceModel -

AttributeAppender

public AttributeAppender(String attribute,
                 Serializable value)

Creates an attribute modifier that appends the value to the attribute's current value, optionally separated by the separator.

Parameters:

attribute -

value -

AttributeAppender

public AttributeAppender(String attribute,
                 IModel<?> appendModel,
                 String separator)

Creates an AttributeModifier that appends the appendModel's value to the current value of the attribute, and will add the attribute when it is not there already.

Parameters:

attribute - the attribute to append the appendModels value to

appendModel - the model supplying the value to append

separator - the separator string, comes between the original value and the append value

Method Detail

getSeparator

public String getSeparator()

Gets the separator used by attribute appenders and prependers.

Returns:

the separator used by attribute appenders and prependers.

setSeparator

public AttributeAppender setSeparator(String separator)

Sets the separator used by attribute appenders and prependers.

Parameters:

separator - a space, semicolon or other character used to separate the current value and the appended/prepended value.

Returns:

this

newValue

protected String newValue(String currentValue,
              String appendValue)

Description copied from class: AttributeModifier

Gets the value that should replace the current attribute value. This gives users the ultimate means to customize what will be used as the attribute value. For instance, you might decide to append the replacement value to the current instead of just replacing it as is Wicket's default.

Overrides:

newValue in class AttributeModifier

Parameters:

currentValue - The current attribute value. This value might be null!

appendValue - The replacement value. This value might be null!

Returns:

The value that should replace the current attribute value

toString

public String toString()

Overrides:

toString in class AttributeModifier

See Also:

Object.toString()