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Generate Structure Group Navigation - Reorder TBB

This TBB Generates an XML containing all Structure Groups and Pages whose title abides to a naming convention, in hierarchical structure. The naming convention is given by regular expression (e.g. title starts with 3 digits followed by underscore or space).

Description

Name
Generate Structure Group Navigation Reorder TBB
Type
·    Template in .NET Assembly
Description
Used to:
·    Generate navigation XML;
Notes:
This TBB reads the Publication's Root Structure Group and retrieves all child SGs and Pages using the .GetListItems() method.
The template reorders each node in the retrieved XML and it places it in a hierarchical structure that matches the SG/Page nesting.
Each SG object is represented as a tcm:Item node that has potential sub-nodes (other SGs and Pages).
The Page objects are represented also as tcm:Item nodes and they are the leaf nodes in the XML document.
The produced XML document is added to the Package as item named "Output".
Parameters
N/A
Applicable to
Page Templates - no other TBB is required on the PT

The XML

Each node is the navigation XML has the following attributes:
  • ID - the SG or Page TCMURI;
  • Title - the name of the SG or Page (as defined in Tridion CM);
  • DisplayTitle - the name of the SG or Page after removing the three digit and underscore or space prefix;
  • Url - the PublicationLocationUrl of the SG or Page;
Sample navigation XML:

<tcm:ListItems ID="tcm:1-1-4" Title="Root">
  <tcm:Item ID="tcm:1-2-4" Title="010 About Us" DisplayTitle="About Us" Url="/about-us">
    <tcm:Item ID="tcm:1-3-64" Title="010 Who are we?" DisplayTitle="Who are we?" Url="/about-us/who-are-we.html"/>
  </tcm:Item>
  <tcm:Item ID="tcm:1-4-64" Title="020 Contact Us" DisplayTitle="Contact Us" Url="/contact-us.html"/>
</tcm:ListItems>

The Code

The TBB uses templating API method .GetListItems(filter) to retrieve all Structure Groups and Pages in a flat XML document format.

The template applies hierarchy to the XML document by reordering each node and appending it to its rightful parent.

private XmlElement BuildNavigationReorder(StructureGroup structureGroup) {
    XmlElement navigationXml = structureGroup.GetListItems(filter);
    List<XmlElement> itemList = new List<XmlElement>(navigationXml.ChildNodes.Cast<XmlElement>());
    namespaceManager = new XmlNamespaceManager(navigationXml.OwnerDocument.NameTable);
    namespaceManager.AddNamespace("tcm", TCM_NAMESPACE_URI);

    foreach (XmlElement item in itemList) {
        string itemTitle = item.Attributes[ATTRIBUTE_TITLE].Value;
        if (IsNavigable(itemTitle)) {
            TcmUri itemId = new TcmUri(item.Attributes[ATTRIBUTE_ID].Value);
            ItemType itemType = itemId.ItemType;
            TcmUri parentId = null;

            // enhance item node
            if (itemType == ItemType.StructureGroup) {
                StructureGroup childSG = m_Engine.GetObject(itemId) as StructureGroup;
                parentId = childSG.OrganizationalItem.Id;
                EnhanceNode(item, childSG);
            } else if (itemType == ItemType.Page) {
                Page childPage = m_Engine.GetObject(itemId) as Page;
                parentId = childPage.OrganizationalItem.Id;
                EnhanceNode(item, childPage);
            }

            // reorder - apply hierarchy
            XmlNode parent = navigationXml.SelectSingleNode(String.Format("//tcm:Item[@ID='{0}']", parentId), namespaceManager);
            if (parent == null) {
                if (parentId != structureGroup.Id) {
                    navigationXml.RemoveChild(item);
                }
            } else {
                parent.AppendChild(item);
            }
        } else {
            navigationXml.RemoveChild(item);
        }
    }

    return navigationXml;
}

Enhance the XmlElement corresponding to a SG or Page with information such as DisplayTitle, URL, etc.

private void EnhanceNode(XmlElement item, Page page) {
    string displayTitle = navigationItemRegex.Replace(page.Title, "");
    item.SetAttribute(ATTRIBUTE_DISPLAY_TITLE, displayTitle);

    string url = page.PublishLocationUrl;
    item.SetAttribute(ATTRIBUTE_URL, url);
}

private void EnhanceNode(XmlElement item, StructureGroup structureGroup) {
    string displayTitle = navigationItemRegex.Replace(structureGroup.Title, "");
    item.SetAttribute(ATTRIBUTE_DISPLAY_TITLE, displayTitle);

    string url = structureGroup.PublishLocationUrl;
    item.SetAttribute(ATTRIBUTE_URL, url);
}

Only consider items that match a given Regular Expression. In this instance, the expression is ^\\d{3}[_ ] (starts with three digits followed by an underscore or space).

private bool IsNavigable(string title) {
    return navigationItemRegex.IsMatch(title);
}


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