Question

I have a recusive-method that creates a unordered list from a XML document. To check which node I am positioned on I use the querystring to match the URL in the XML document.

I need to add the class ‘current’ on the parent node if I am positioned on its child node.

Like this:

    MenuItem 1
    MenuItem 2 [class current]
         MenuItem 3 [class current] (selected node)
    MenuItem 4

My XML document is like this:

<MenuItem Name="MenuItem 1" Url="MenuItem1.aspx"/>
<MenuItem Name="MenuItem 2" Url="MenuItem2.aspx">
    <MenuItem Name="MenuItem 3" Url="MenuItem3.aspx" />
</MenuItem>
<MenuItem Name="MenuItem4" Url="MenuItem4.asp" />

And my current code looks like this:

foreach (XmlNode item in menuitems)
{
    if (HttpContext.Current.Request.Url.AbsolutePath.ToLower() == item.Attributes["Url"].Value.ToLower())
    {
        writer.AddAttribute(HtmlTextWriterAttribute.Class, "current");
    }
    writer.RenderBeginTag(HtmlTextWriterTag.Li);
    // And so on...
}

So I need some kind of function to find this node and place a class on that node aswell.

If you need more code, information or anything else – please say so! 🙂

Thank you!

Answer 1

Thanks for the answers. But I solved my own problem. You guys get upvotes for your effort.

Here was my solution:

System.Collections.Hashtable ht = new System.Collections.Hashtable();
ht.Add("Url", HttpContext.Current.Request.Url.AbsolutePath.ToLower());

XmlNode currentpage = Core.FindChildNode(item, "MenuItem", ht);

if (HttpContext.Current.Request.RawUrl.ToLower() == item.Attributes["Url"].Value.ToLower() || currentpage != null)
{
     writer.AddAttribute(HtmlTextWriterAttribute.Class, "current");
}

This is my FindChildNode method

public static XmlNode FindChildNode(XmlNode parent, string name, System.Collections.Hashtable keyvaluecollection)
    {
        if (parent.NodeType != XmlNodeType.Element) return null;
        XmlElement el = (XmlElement)parent;

        XmlNodeList nodes = el.GetElementsByTagName(name);
        foreach (XmlNode node in nodes)
        {
            if (node.NodeType == XmlNodeType.Element)
            {
                bool found = false;
                foreach (string key in keyvaluecollection.Keys)
                {
                    if (node.Attributes[key] != null && node.Attributes[key].Value == (string)keyvaluecollection[key])
                    {
                        found = true;
                    }
                    else
                    {
                        found = false;
                        break;
                    }
                }
                if (found) return node;
            }
        }
        return null;
    }

Seems to work like a charm! 🙂