How to pass a page parameter value that has no expression in it?

[jinghuiyin]

I have a page (AttachFiles.xhtml) that can possibly come from different previous pages leading to it (one of them shown here is StudentEditStudent page).  I need a mechanism to keep track of which page it's from.  I tried to set it in the navigation rule like this:

	<navigation from-action="#{studentProfileHome.persist2}">
	<end-conversation/>
	<redirect view-id="/secure/AttachFiles.xhtml">
	<param name="studentId" value="#{studentProfileHome.studentProfileStudentId}"/>
	<param name="reportingYear" value="#{studentProfileHome.reportingYear}"/>
	<param name="from" value="StudentEditStudent"/>
	</redirect>
	</navigation>

Any idea how I can set this?

Thanks!

[jinghuiyin]

here is the error message:

javax.faces.el.ReferenceSyntaxException: Invalid expression: 'StudentEditStudent'. Parsed Expression of unexpected type java.lang.String

[vata2999]

why don't you use conversation, there is viewId attribute in conversation which indicates the last jsf view that was rendered while the conversation was active

[jinghuiyin]

Do you mean use this in AttachFiles.page.xml?  and I will be able to get the last view id from conversation?

<page no-conversation-view-id="/secure/AttachFiles.xhtml"
                login-required="true">
    <begin-conversation join="true"/>                
    <action execute="#{studentProfileDocumentHome.wire}"/>
    <param name="studentId" value="#{studentProfileDocumentHome.studentId}"/>
    <param name="reportingYear" value="#{studentProfileDocumentHome.reportingYear}"/>
    <param name="from"/>

</page>

[vata2999]

no i mean this

http://docs.jboss.org/seam/2.2.2.Final/reference/en-US/html_single/#d0e6321

<conversation name="attachFileConversation"

                  parameter-name="attachFileId"

                  parameter-value="#{attachFile.attachId}"/>

and you can retrieve conversation by id

@In
Conversation conversation;

[gebuh]

We have an edit page that can be navigated to from several other pages.  For some reason we have lots of problems with injection, so here's how I do it (I'm always looking for ways to do it better, so feel free to glare disapprovingly):

In a session scoped class I have a method that holds the page value:

 public void setRememberMe(){
        Redirect redirect = Redirect.instance();
        redirect.captureCurrentView();
        this.rememberMe = redirect.getViewId();
    }

In the page.xml of the current view:

 <action execute="#{sessionStuff.setRememberMe}"/>

In the page.xml of the common view for whatever navigation rule:

<redirect view-id="#{sessionStuff.rememberMe}"/>