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Subject: Re: adding parameters for actionHandler
From: simon <simon.kitching@chello.at>
To: MyFaces Development <dev@myfaces.apache.org>
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Date: Fri, 28 Sep 2007 20:16:56 +0200
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On Fri, 2007-09-28 at 08:40 -0700, Gianluca Correndo wrote:
> Hello everyone,
>   I have started to develop with MyFaces and Tobago few weeks ago. I
>  have used
> tomahawk for a while and with it there was an easy way to add
>  parameters to an
> event for customising actions. For example in a page I could add a link
>  to
> erase one ontology I manage:
> 
>  <t:commandLink styleClass="submitButton"  value="erase" id="eraseC"
> action="#{SessionBean.eraseOntology}"> 
>   <f:param name="oid" value="#{ontology.id}"/>
>  </t:commandLink>
> 
> 
> And the event handler was able to retrieve the parameter "oid" from the
>  faces
> context with:
> 
> public void eraseOntology(ActionEvent actionEvent){
>         String oid =
> javax.faces.context.FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get("oid");
> 
>   Now in the Tobago library this doesn't work anymore. How can I
>  achieve the
> same behaviour?

I don't know why it's not working, but there is an elegant alternative.

With JSF1.1 you can use the tomahawk t:updateActionListener tag to get
the same effect. The JSF1.2 standard has made this a part of the
standard.

For JSF1.1, see updateActionListener here:
  http://myfaces.apache.org/tomahawk/tlddoc/index.html

<t:commandLink ....>
  <t:updateActionListener 
    property="#{SessionBean.ontologyToErase}"
    value="#{ontology.id}"/>
</t:commandLink>

The setOntologyToErase method will be called before eraseOntology.

For JSF1.2, see f:setPropertyActionListener here:
http://java.sun.com/javaee/javaserverfaces/1.2/docs/tlddocs/index.html

NB: I haven't used this for a while so the syntax might not be exactly
right..

Regards,

Simon