如果导航标题为空，则隐藏导航标题答案

【问题标题】：Hide navigation header if its empty如果导航标题为空，则隐藏导航标题
【发布时间】：2015-12-03 12:52:35
【问题描述】：

如果侧面导航不包含任何值，我想隐藏它的页眉和页脚。

@inherits UmbracoTemplatePage

<div id="LeftMenuHolder">               @*<----Not show/include these if list is empty*@
    <span class="Head-Round-Red">       @*<----Not show/include these if list is empty*@
        <span>@CurrentPage.Name</span>  @*<----Not show/include these if list is empty*@
    </span>@*<----Not show these if list is empty*@

    <ul>
        @if (CurrentPage.Parent.DocumentTypeAlias == "Home")
        {
            foreach (var item in CurrentPage.Children.Where("Visible"))
            {
                <li>
                    <a href="@item.Url">
                        <span>@item.Name</span>
                    </a>
                </li>
            }
        }
        else
        {
            foreach (var sibling in CurrentPage.Parent.Children)
            {
                <li>
                    <a href="@sibling.Url">
                        <span>@sibling.Name</span>
                    </a>
                </li>
            }
        }
    </ul>
    <span class="BoxBot">      @*<----Not show/include these if list is empty*@
        <span></span>          @*<----Not show/include these if list is empty*@
    </span>                    @*<----Not show/include these if list is empty*@
    </div>

我确信这可以通过 if 语句来解决，但我不太确定。

【问题讨论】：

您的侧边导航是否包含与当前页面“同级”（在同一结构级别）节点的页面？或者它是一种不同的实现方式？
@MarkoJ.I 确实包含同级页面

标签： html razor umbraco

【解决方案1】：

您可以执行以下操作来检索兄弟节点，然后检查列表是否为空：

IPublishedContent parentNode = Umbraco.AssignedContentItem.Parent;

IEnumerable<IPublishedContent> siblingNodes = Umbraco.
                                              AssignedContentItem.
                                              Parent.
                                              Children.
                                              Where(x => !x.Name.Equals(Umbraco.AssignedContentItem.Name) &&
                                                         ((bool)x.GetProperty("UmbracoNaviHide") == false);

对于您的实现，请尝试使用初始化属性执行类似操作（如果页面中没有 UmbracoNaviHide，请将其从 Linq 语句中删除），如果您想显示当前页面，请删除此条件项目：Where(x => !x.Name.Equals(Umbraco.AssignedContentItem.Name)

@inherits Umbraco.Web.Mvc.UmbracoViewPage<dynamic>

@{
     IPublishedContent parentNode = Umbraco.AssignedContentItem.Parent;

     IEnumerable<IPublishedContent> siblingNodes = Umbraco.
                                                   AssignedContentItem.
                                                   Parent.
                                                   Children.
                                                   Where(x => !x.Name.Equals(Umbraco.AssignedContentItem.Name) &&
                                                              ((bool)x.GetProperty("UmbracoNaviHide") == false);
}

@if(siblingNodes.Any())
{
<div id="LeftMenuHolder">               @*<----Not show/include these if list is empty*@
    <span class="Head-Round-Red">       @*<----Not show/include these if list is empty*@
        <span>@CurrentPage.Name</span>  @*<----Not show/include these if list is empty*@
    </span>                             @*<----Not show these if list is empty*@
}

    <ul>
        @if (CurrentPage.Parent.DocumentTypeAlias == "Home")
        {
            foreach (var item in CurrentPage.Children.Where("Visible"))
            {
                <li>
                    <a href="@item.Url">
                        <span>@item.Name</span>
                    </a>
                </li>
            }
        }
        else
        {
            foreach (var sibling in CurrentPage.Parent.Children)
            {
                <li>
                    <a href="@sibling.Url">
                        <span>@sibling.Name</span>
                    </a>
                </li>
            }
        }
    </ul>
@if(siblingNodes.Any())
{
    <span class="BoxBot">      @*<----Not show/include these if list is empty*@
        <span></span>          @*<----Not show/include these if list is empty*@
    </span>                    @*<----Not show/include these if list is empty*@
}
    </div>

此外，Umbraco 变量可从 UmbracoViewPage 获得，因此您必须将继承模型更改为如下形式：@inherits Umbraco.Web.Mvc.UmbracoViewPage<dynamic>。

【讨论】：