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Last week we talked a bit about Inter Module Communication, the ability of one module to notify another module on the page that something needs to happen without requiring a post back.  The other need you may have is something I refer to as Cross Page Communication.  This is not a DotNetNuke term, I just made it up today.

Here’s the problem.  In some cases, you may have a module that you’ve placed on a page that should only ever be on one page.  In my case, this was the checkout module.  I needed some way of retrieving the page that that module was on so that I could create a hyperlink to that page from my modules that displayed my products and my “mini cart” module that displayed a summary of items in the shopping cart.

Here’s how I did it:

// Find the tab the module specified by
//friendlyName, is on.

// ModuleController is in:
// DotNetNuke.Entities.Modules namespace
ModuleController moduleController =
    new ModuleController();

// User the friendlyName to find the moduleID
int myModuleDefId =
    Globals.GetDesktopModuleByName(friendlyName)
        .DesktopModuleID;

// Get all the tabs available for this portal.
ArrayList tabs = (new TabController())
    .GetTabs(portalId);
foreach (TabInfo ti in tabs)
{
    // For each page, find all the modules on the page
    Dictionary<int,ModuleInfo> modules =
        moduleController.GetTabModules( ti.TabID);
    foreach (ModuleInfo mi in modules.Values)
    {
        // If the module on the page is the module we
        // are looking for, return it.
        if (mi.DesktopModuleID == myModuleDefId)
        {
            return ti.TabID;
        }
    }
}

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