String targetViewId = navigationCase.getToViewId();
if (targetViewId.indexOf("#{") != -1)
{
ValueBinding vb = facesContext.getApplication().createValueBinding(navigationCase.getToViewId());
if (vb != null)
targetViewId = (String) vb.getValue(facesContext);
}
String redirectPath = viewHandler.getActionURL(facesContext, targetViewId);
Costa Basil <[EMAIL PROTECTED]> wrote:
Hi,
This is a solution to an issue that some people complained about and that is how to preserve request objects or other objects when you do a redirect.
It is actually possible to specify JSF EL expressions in the to-view-id view. Example:
In faces-config.xml I have:
<navigation-case>
<from-outcome>goViewObject</from-outcome>
<to-view-id>viewObject.jsp?test=#{param.test}</to-view-id>
<redirect />
</navigation-case>
In a test page I created I have:
<h:commandLink id="cmdLink" action="" value="Go To View Object">
<f:param name="test" value="xyz"/>
</h:commandLink>
When I click on the link myfaces will redirect me to: viewObject.jsp?test=xyz.
In order to do this I had to make a slight change to the navigation handler (org.apache.myfaces.application.NavigationHandlerImpl)
that comes with MyFaces:
I added the following lines:
ValueBinding vb = facesContext.getApplication().createValueBinding(navigationCase.getToViewId());
String targetViewId = vb != null ? (String)vb.getValue(facesC ontext) : navigationCase.getToViewId();
String redirectPath = viewHandler.getActionURL(facesContext, targetViewId);
to replace line 128 in org.apache.myfaces.application.NavigationHandlerImpl (myfaces 1.1.1):
line 128: String redirectPath = viewHandler.getActionURL(facesContext, navigationCase.getToViewId());
This way you can specify a JSF EL _expression_ that would dynamically compute the viewId or a portion of the viewId. You could use this to save an object under a temporary key in the session scope, and then pass this key to the next page (you are redirecting to) which would use it to retrieve the object from the session scope (and remove it).
I think the ability to specify JSF EL expressions in the to-view-id elements should be part of the standard.
Any thoughts?
The other alternative to this would be to perform the redirection "manually" in the action method (the parameters would have to be added manually).
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