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Generate Structure Group Navigation - GetItems 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 GetItems 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 .GetItems() method.
It creates an XmlDocument object and start building its nodes. 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 .GetItems(filter) to retrieve the Structure Group and Page objects.

An XmlDocument is created and each SG and Page object is added in hierarchical order into this document as tcm:Item nodes.

private XmlElement BuildNavigationGetItems(StructureGroup structureGroup) {
    XmlDocument dom = new XmlDocument();
    dom.AppendChild(dom.CreateXmlDeclaration("1.0", "UTF-8", null));
    namespaceManager = new XmlNamespaceManager(dom.NameTable);
    namespaceManager.AddNamespace("tcm", TCM_NAMESPACE_URI);

    XmlElement navigationXml = dom.CreateElement("tcm:ListItems", TCM_NAMESPACE_URI);
    EnhanceNode(navigationXml, (RepositoryLocalObject)structureGroup);
    dom.AppendChild(navigationXml);

    foreach (RepositoryLocalObject item in structureGroup.GetItems(filter)) {
        if (IsNavigable(item.Title)) {
            XmlElement itemElement = dom.CreateElement("tcm:Item", TCM_NAMESPACE_URI);
            EnhanceNode(itemElement, item);

            // enhance item node
            TcmUri itemId = item.Id;
            ItemType itemType = itemId.ItemType;
            if (itemType == ItemType.StructureGroup) {
                EnhanceNode(itemElement, (StructureGroup)item);
            } else if (itemType == ItemType.Page) {
                EnhanceNode(itemElement, (Page)item);
            }

            // build hierarchy
            TcmUri parentId = item.OrganizationalItem.Id;
            XmlNode parent = dom.SelectSingleNode(String.Format("//tcm:Item[@{0}='{1}']", ATTRIBUTE_ID, parentId), namespaceManager);
            if (parent == null) {
                if (parentId != structureGroup.Id) {
                    itemElement.SetAttribute(ATTRIBUTE_PARENT, parentId);
                }
                navigationXml.AppendChild(itemElement);
            } else {
                parent.AppendChild(itemElement);
            }
        }
    }

    // fix orphan items
    foreach (XmlNode item in dom.SelectNodes(string.Format("/tcm:ListItems/tcm:Item[@{0}]", ATTRIBUTE_PARENT), namespaceManager)) {
        string parentId = item.Attributes[ATTRIBUTE_PARENT].Value;
        item.Attributes.RemoveNamedItem(ATTRIBUTE_PARENT);
        XmlNode parent = dom.SelectSingleNode(String.Format("//tcm:Item[@{0}='{1}']", ATTRIBUTE_ID, parentId), namespaceManager);
        parent.AppendChild(item);
    }

    return navigationXml;
}

Enhance the XmlElement corresponding to a SG or Page with information such as ID and Title.

private void EnhanceNode(XmlElement item, RepositoryLocalObject rlo) {
    item.SetAttribute(ATTRIBUTE_ID, rlo.Id);
    item.SetAttribute(ATTRIBUTE_TITLE, rlo.Title);
}

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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