doctype and traverse

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Chuck 71 posts 69 karma points

Jul 12, 2012 @ 18:43

Doctype and Traverse

So I am working on a tansverse razor script and I want to be able to pass the name of the doctype I want to list out into the helper and then in my foreach loop use a variable that contains the name of the doctype. Is there anyway to do this. This is what i have and it's not working.

@traverse("ProductCategory",parent,startNode)
@helper traverse(string docTypeName, dynamic parent) {
      <ul>                                                       
       @foreach (var node in parent.ProductCategory) {
      <li>
        <a href="@node.Url">@node.Name</a>
        @if (@node.Children.Count() > 0) {@traverse(docTypeName,node);}
      </li>
      }
      </ul>  
}

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Chuck 71 posts 69 karma points

Jul 12, 2012 @ 18:45

actually thats wrong... my foreach loop looks like this.

@helper traverse(string docTypeName, dynamic parent) {
      <ul>                                                       
       @foreach (var node in parent.docTypeName) {
      <li>
        <a href="@node.Url">@node.Name</a>
        @if (@node.Children.Count() > 0) {@traverse(docTypeName,node);}
      </li>
      }
      </ul>  
}

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Douglas Ludlow 210 posts 366 karma points

Jul 12, 2012 @ 18:57

This is what you'll want to do:

@helper traverse(string docTypeName, dynamic parent)
{
    if (parent.Children.Count() > 0)
    {
        <ul>                                                       
        @foreach (var node in parent.Children.Where("NodeTypeAlias == @0", docTypeName))
        {
            <li>
                <a href="@node.Url">@node.Name</a>
                @traverse(docTypeName, node)
            </li>
        }
        </ul> 
    }
}

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Chuck 71 posts 69 karma points

Jul 12, 2012 @ 19:02

0

Doug, thanks, the trick for me was in how you targeted the NodeTypeAlias... I have never seen the ==@0... what does that mean? How does that work?

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Douglas Ludlow 210 posts 366 karma points

Jul 12, 2012 @ 19:20
0
When dealing with dynamic objects you can't use the regular .Where linq method that you'd normally use in a standard .NET application. So the Umbraco developers added support by creating their own Where method. This method uses a string replace simular to .NET's String.Format method to add string variables in as parameters of the method, only String.Format uses '{0}' instead of '@0'. The number after the "at" sign is the index of the parameter. So if you were writing a Where statement with more than one parameter, you could do something like the following:

var nodes = Model.Children.Where("NodeTypeAlias == @0 && someOtherProperty == @1","alias","someValue");

Hope that helps you understand it some more.
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