ASP.NET MVC - 导航中的当前页面突出显示

Question

我想知道在使用ASP.NET MVC 3时如何将CSS类添加到导航中的当前页面？这是我在_Layout.cshtml文件中的导航:

<p>@Html.ActionLink("Product Search", "Index", new { controller = "Home" }, new { @class = "current" })
                | @Html.ActionLink("Orders", "Index", new { controller = "Orders" }) 
                | @Html.ActionLink("My Account", "MyAccount", new { controller = "Account" })
                | @Html.ActionLink("Logout", "LogOff", new { controller = "Account" })</p>

正如您所看到的,我的导航中有4个链接,第一个链接应用了CSS类"当前",我希望能够根据哪个页面将此类添加/删除到导航中的不同链接用户在.这可能吗？

干杯

Answer 1

你可以这样做

@{ 
   var currentController = ViewContext.RouteData.Values["controller"] as string ?? "Home";
   var currentAction = ViewContext.RouteData.Values["action"] as string ?? "Index";
   var currentPage = (currentController + "-" + currentAction ).ToLower();
}

@Html.ActionLink("Product Search", "Index", "Home", null,
                 new { @class = currentPage == "home-index" ? "current" : "" })
@Html.ActionLink("MyAccount", "MyAccount", "Account", null,
                  new { @class = currentPage == "account-myaccount" ? "current" : "" })

Answer 2

我建议使用扩展方法.就像是:

public static HtmlString NavigationLink(
    this HtmlHelper html,
    string linkText,
    string actionName,
    string controllerName)
{
    string contextAction = (string)html.ViewContext.RouteData.Values["action"];
    string contextController = (string)html.ViewContext.RouteData.Values["controller"];

    bool isCurrent =
        string.Equals(contextAction, actionName, StringComparison.CurrentCultureIgnoreCase) &&
        string.Equals(contextController, controllerName, StringComparison.CurrentCultureIgnoreCase);

    return html.ActionLink(
        linkText,
        actionName,
        controllerName,
        routeValues: null,
        htmlAttributes: isCurrent ? new { @class = "current" } : null);
}

然后,您可以通过包含扩展名称空间并只调用方法在View中使用它:

@using MyExtensionNamespace;

...

  @Html.NavigationLink("Product Search", "Index", "Home")
| @Html.NavigationLink("Orders", "Index", "Orders") 
| @Html.NavigationLink("My Account", "MyAccount", "Account")
| @Html.NavigationLink("Logout", "LogOff", "Account")

这有利于保持剃须刀更清洁,并且可以在其他视图中轻松重复使用.

Answer 3

@{
   var controller = ViewContext.RouteData.Values["controller"].ToString();
   var action = ViewContext.RouteData.Values["action"].ToString();
   var isActiveController = new Func<string, string, string, string, string>((ctrl, act, activeStyle, inactiveStyle) => controller == ctrl && action == act ? activeStyle : inactiveStyle);
 }

然后在HTML的class属性中,您可以执行以下操作:

class="@isActiveController("controlername","action","activecssstyleclass","inactiveccsstyle")"

只是另一种方式@dknaack他的答案..更通用,更少的功能重复你的代码.

Answer 4

就我而言，假设我有一个主页和一个菜单。

ViewBag.Active在主页中添加 a作为占位符，如下所示：

@{
   ViewBag.Title = "Home";
   ViewBag.Active = "Home";
}

然后将其放置到您的li类中作为激活或不激活它的条件：

 <li class="@(ViewBag.Active=="Home"? "active" : "")">
      <a href="@Url.Action("Index", "Home")"><span>@ViewBag.Title</span></a>
 </li>