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  • Mov3nforward 118 posts 320 karma points
    Jan 07, 2021 @ 02:18
    Mov3nforward
    0

    Getting number of child nodes in Umbraco V8

    I am trying to figure out how to check if a node has child nodes for a menu.

    In v7 I had something like this.

    var mainNavigation = navigation.GetPropertyValue<IEnumerable<Link>>("mainNavigation");
<div class="navbar-wrap">
    <nav class="navbar navbar-expand-lg">
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbar" aria-controls="navbar" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
        <div id="navbar" class="collapse navbar-collapse">
            <ul class="navbar-nav ml-auto">
                @foreach (var item in mainNavigation)
                {           

                        int childNodeCnt = 0;
                        childNodeCnt = Umbraco.TypedContent(item.Udi).Children().Where("Visible").Where("hideFromMenu == false").Count();

    The code for V7 does not work for v8 and I am not sure how to translate it.

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  • Huw Reddick 1932 posts 6722 karma points MVP 2x c-trib
    Jan 07, 2021 @ 08:29
    Huw Reddick
    0

    try something like this

    item.Children().Where(x => x.IsVisible()) && !item.Value<bool>("hideFromNav")).Count()
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  • Nik 1625 posts 7295 karma points MVP 7x c-trib
    Jan 07, 2021 @ 08:59
    Nik
    101

    Hi Mov3nforward,

    I would do something like this:

    var contentNode = Umbraco.TypedContent(item.Udi);
int childNodeCnt = contentNode == null ? 0 :
         contentNode.Children().Count(c => c.IsVisible() && !c.Value<bool>("hideFromMenu"));

    This takes advantage of full Linq statements, where as your v7 example is using dynamic linq which is no longer present in v8. It also adds in a check to make sure you get a content item back from the item.Udi line.

    Hope that helps.

    Nik

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  • Mov3nforward 118 posts 320 karma points
    Jan 07, 2021 @ 21:56
    Mov3nforward
    0

    @Nik,

    Your code throws an error.

    CS1061: 'UmbracoHelper' does not contain a definition for 'TypedContent' and no accessible extension method 'TypedContent' accepting a first argument of type 'UmbracoHelper' could be found (are you missing a using directive or an assembly reference?)

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  • Nik 1625 posts 7295 karma points MVP 7x c-trib
    Jan 07, 2021 @ 22:03
    Nik
    0

    That would be because I was an idiot and forgot to update that line to be v8 compatible. Sorry about that. It should read:

    var contentNode = Umbraco.Content(item.Udi);

    Sorry about that. I'm also making the assumption that item.Udi is giving you the correct value that is expected by that method. I can't recall if it takes a UDI, or if you need to get the id/guid from it first.

    Nik

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  • Mov3nforward 118 posts 320 karma points
    Jan 07, 2021 @ 22:26
    Mov3nforward
    0

    Thank you that works.

    Now I am trying to pass to a helper the parent node so I can get the subpages to populate a dropdown menu. 

    var contentNode = Umbraco.Content(link.Udi);
                        int childNodeCnt = contentNode == null ? 0 : contentNode.Children().Count(c => c.IsVisible() && !c.Value<bool>("hideFromMenu"));



                            <li class="menu-item">
                                <a class="menu-link" href="@linkURL" title="@Html.Raw(linkTitle)" target="@Html.Raw(linkTarget)"><div>@link.Name</div></a>

                                if(childNodeCnt > 0 && contentNode.DocumentTypeAlias != "homePage" && contentNode.DocumentTypeAlias == "parentNode" )
                                { 
                                    <div class="dropdown-menu">
                                     @GetDropDown(contentNode)
                                    </div>
                                }

                            </li>

    /**********

    @helper GetDropDown(IEnumerable<IPublishedContent> pages){
if(pages.Count() > 0){
    <div class="col">
    @foreach(var node in pages){
        <a class="dropdown-item" href="@node.Url">
            @node.Name
        </a>
    }
    </div>
}}

    I am getting this error. CS1503: Argument 1: cannot convert from 'Umbraco.Core.Models.PublishedContent.IPublishedContent' to 'System.Collections.Generic.IEnumerable

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  • Huw Reddick 1932 posts 6722 karma points MVP 2x c-trib
    Apr 22, 2021 @ 21:08
    Huw Reddick
    1

    you probably need to do

    @GetDropDown(contentNode.Children)

    you are just passing in a contentnode, but you want to pass in the children instead as your hepler is expecting a collection

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