org.omnifaces.component.search

Class MessagesKeywordResolver

java.lang.Object

javax.faces.component.search.SearchKeywordResolver

org.omnifaces.component.search.MessagesKeywordResolver

public class MessagesKeywordResolver
extends SearchKeywordResolver

The @messages search keyword resolver will automatically resolve all UIMessage and UIMessages components within the current UIForm. This is particularly useful when you have a relatively large form and would like to Ajax-update only the message components when submitting the form.

 <h:form id="form">
     <h:inputText id="input1" ... />
     <h:message id="m_input1" for="input1" />
     <h:inputText id="input2" ... />
     <h:message id="m_input2" for="input2" />
     <h:inputText id="input3" ... />
     <h:message id="m_input3" for="input3" />
     ...
     <h:commandButton ...>
         <f:ajax execute="@form" render="@messages" />
     </h:commandButton>
     <h:messages id="m_form" globalOnly="true" redisplay="false" />
 </h:form>
 

This has only one prerequirement: the message component must have a fixed id attribute set as demonstrated above. Otherwise JSF won't render anything to the client side when there are no messages and ultimately JavaScript won't be able to find it when processing the JSF Ajax response.

This keyword resolver is already registered by OmniFaces own faces-config.xml and thus gets auto-initialized when the OmniFaces JAR is bundled in a web application, so end-users do not need to register this keyword resolver explicitly themselves.

Compatibility

This keyword resolver is only compatible with <f:ajax> of Mojarra 2.3.4 or newer. This keyword resolver is not compatible with <p:ajax> of PrimeFaces 6.x. It's only compatible with a PrimeFaces version designed specifically for JSF 2.3.

Since:

3.1

Author:

Bauke Scholtz

Constructor Summary

Constructors

Constructor and Description
MessagesKeywordResolver()

Method Summary

Modifier and Type	Method and Description
boolean	isResolverForKeyword(SearchExpressionContext context, String keyword) Returns true when keyword equals "messages".
static void	register(Application application) Invoked by ApplicationProcessor.
void	resolve(SearchKeywordContext context, UIComponent component, String keyword) Grab the current UIForm, visit it and collect client IDs of all UIMessage and UIMessages components and finally invoke context call back with an UIMessage component whose client ID returns a space separated collection of found client IDs.

Methods inherited from class javax.faces.component.search.SearchKeywordResolver

isLeaf, isPassthrough

Methods inherited from class java.lang.Object

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

Constructor Detail

MessagesKeywordResolver

public MessagesKeywordResolver()

Method Detail

register

public static void register(Application application)

Invoked by ApplicationProcessor.

Parameters:

application - Involved faces application.

isResolverForKeyword

public boolean isResolverForKeyword(SearchExpressionContext context,
                                    String keyword)

Returns true when keyword equals "messages".

Specified by:

isResolverForKeyword in class SearchKeywordResolver

resolve

public void resolve(SearchKeywordContext context,
                    UIComponent component,
                    String keyword)

Grab the current UIForm, visit it and collect client IDs of all UIMessage and UIMessages components and finally invoke context call back with an UIMessage component whose client ID returns a space separated collection of found client IDs.

Specified by:

resolve in class SearchKeywordResolver