ByEPCM top level navigation in between federated portals

Question

Hi Everyone,
we're currently having an issue where our bespoke top level navigation isn't working properly between our federated EP and CE systems. The TLN is a hover menu style navigation and uses byEPCM to navigate. The problem occurs when the user logs on to EP, navigates to an iview that is on the CE box (via federation) and then tries to navigate back to an EP iview. Instead of displaying the iview the user sees "page not found" in the content area and has to reload the whole portal framework for it to work.
The logs don't seem to suggest very much apart from it looking for the role/iview on the CE box as opposed to the EP box (??). This does not happen using the standard SAP TLN and also doesn't seem to happen when using byURL instead of byEPCM. Now,  the natural suggestion would be - why not use byURL instead? This is valid approach and I will test this but I distinctly remember that there was a reason why I used byEPCM as opposed to byURL in the first place (just can't remember what it was as it was a long time ago). In any case I will test this over the next few days.
I can't help think though that this might be a config or security/permission setting somewhere on either EP or CE (probably CE). Anyone who has encountered this before and can maybe shed some light or have any suggestions on where to start looking?
Thanks,
Dion

Answer 1

Hi Henrik,
you could listen to the navigation event (just as the TLN does to navigate to the next page).
Here is how it works (JS code):<pre>function myNavEventHandler(eventObj) {
    var navigationTarget="";
    if (typeof (eventObj.dataObject)=="string")
        navigationTarget = eventObj.dataObject;
    else
        navigationTarget = eventObj.dataObject.target;
    <i>// add code handling <b>navigationTarget</b></i>
EPCM.subscribeEvent("urn:com.sapportals:navigation", "Navigate", myNavEventHandler);
</pre>Put this code into an component/iView, then place it into the framework page.
That should be it...
Regards
Sven