org.apache.tapestry5.annotations

Annotation Type ActivationRequestParameter

@Target(value=FIELD)
@Retention(value=RUNTIME)
@Documented
@UseWith(value=PAGE)
public @interface ActivationRequestParameter

Marks a field of a page (not a component) as persistent within the URL, as with a page activation context. The field is mapped to a query parameter. When component event or page render links are generated for the page, additional values will be added to the Link (via the EventConstants.DECORATE_COMPONENT_EVENT_LINK or EventConstants.DECORATE_PAGE_RENDER_LINK events). The field may be of any type; a ValueEncoder (from the ValueEncoderSource) will be used to convert between client-side and server-side representations. Null values are not added as query parameters (just non-null). When a page is activated, the mapped fields will receive their values before an activate event handler method is invoked. This annotation is an alternative to Persist. Fields annotated with ActivationRequestParameter are not considered persistent (its a process parallel to the one related to the Persist annotation). Invoking ComponentResources.discardPersistentFieldChanges() will not affect annotated fields, only assigning them back to null will.

See Also:

RequestParameter, ValueEncoder

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
boolean	required If true then a null value is an error.
String	value The name of the query parameter, which defaults to the name of the field.

Element Detail

value

public abstract String value

The name of the query parameter, which defaults to the name of the field.

Default:

""

required

public abstract boolean required

If true then a null value is an error. If false, then a null value will result in no update to the field. Either way, a null field value will result in no query parameter added to a generated link.

Since:

5.4

Default:

false