17

作为讨论的基础。创建一个标准的 ASP.NET MVC Web 项目。

它将在母版页中包含两个菜单项:

<div id="menucontainer">
  <ul id="menu">
    <li>
      <%= Html.ActionLink("Home", "Index", "Home")%></li>
    <li>
      <%= Html.ActionLink("About", "About", "Home")%></li>
  </ul>
</div>

如何设置指示当前页面的视觉 CSS 样式。例如,当在 About 页面/控制器中时,我基本上想这样做:

<%= Html.ActionLink("About", "About", "Home", new {class="current"})%></li>

当然,在主页上时:

<%= Html.ActionLink("Home", "Index", "Home", new {class="current"})%></li>

(有一个 CSS 样式名称 current,在菜单中直观地表明这是当前页面。)

我可以将母版页中的菜单 div 拆分为内容占位符,但这意味着我必须将菜单放在每个页面上。

任何想法,有没有一个很好的解决方案?

4

5 回答 5

24

最简单的方法是从 ViewContext 的 RouteData 中获取当前的控制器和动作。注意签名的变化和使用@来转义关键字。

<% var controller = ViewContext.RouteData.Values["controller"] as string ?? "Home";
   var action = ViewContext.RouteData.Values["action"] as string ?? "Index";
   var page = (controller + ":" + action).ToLower();
 %>

<%= Html.ActionLink( "About", "About", "Home", null,
                     new { @class = page == "home:about" ? "current" : "" ) %>
<%= Html.ActionLink( "Home", "Index", "Home", null,
                     new { @class = page == "home:index" ? "current" : "" ) %>

请注意,您可以将其与@Jon 之类的 HtmlHelper 扩展结合起来并使其更简洁。

<%= Html.MenuLink( "About", "About", "Home", null, null, "current" ) %>

MenuActionLink 在哪里

public static class MenuHelperExtensions
{
     public static string MenuLink( this HtmlHelper helper,
                                    string text,
                                    string action,
                                    string controller,
                                    object routeValues,
                                    object htmlAttributes,
                                    string currentClass )
     {
         RouteValueDictionary attributes = new RouteValueDictionary( htmlAttributes );
         string currentController = helper.ViewContext.RouteData.Values["controller"] as string ?? "home";
         string currentAction = helper.ViewContext.RouteData.Values["action"] as string ?? "index";
         string page = string.Format( "{0}:{1}", currentController, currentAction ).ToLower();
         string thisPage = string.Format( "{0}:{1}", controller, action ).ToLower();
         attributes["class"] = (page == thisPage) ? currentClass : "";
        return helper.ActionLink( text, action, controller, new RouteValueDictionary( routeValues ), attributes );
     }
}
于 2009-09-24T12:35:49.960 回答
1

我最近为此创建了一个 HTML Helper,如下所示:

public static string NavigationLink(this HtmlHelper helper, string path, string text)
{
    string cssClass = String.Empty;
    if (HttpContext.Current.Request.Path.IndexOf(path) != -1)
    {
        cssClass = "class = 'selected'";
    }

    return String.Format(@"<li><a href='{0}' {1}>{2}</a></li>", path, cssClass, text);
}

实现如下所示:

  <ul id="Navigation">
  <%=Html.NavigationLink("/Path1", "Text1")%>
  <%=Html.NavigationLink("/Path2", "Text2")%>
  <%=Html.NavigationLink("/Path3", "Text3")%>
  <%=Html.NavigationLink("/Path4", "Text4")%>
  </ul>
于 2009-09-24T13:50:59.123 回答
1

如果你使用的是 T4MVC,你可以使用这个:

        public static HtmlString MenuLink(
        this HtmlHelper helper,
        string text,
        IT4MVCActionResult action,
        object htmlAttributes = null)
    {
        var currentController = helper.ViewContext.RouteData.Values["controller"] as string ?? "home";
        var currentAction = helper.ViewContext.RouteData.Values["action"] as string ?? "index";

        var attributes = new RouteValueDictionary(htmlAttributes);
        var cssClass = (attributes.ContainsKey("class"))
                           ? attributes["class"] + " "
                           : string.Empty;

        string selectedClass;
        if(action.Controller.Equals(currentController, StringComparison.InvariantCultureIgnoreCase)
        {
            selectedClass = "selected-parent";
            if(action.Action.Equals(currentAction, StringComparison.InvariantCultureIgnoreCase))
                selectedClass = "selected";
        }
        cssClass += selectedClass;

        attributes["class"] = cssClass;

        return helper.ActionLink(text, (ActionResult)action, attributes);
    }
于 2011-06-29T18:06:17.063 回答
0

可能只是它是第 5 个参数,所以在您的 html 属性之前插入一个 null 。这篇文章在这里这样描述它,虽然你可以在第 4 次争论中传递一些东西,第 5 次是专门针对 HTMLattributes

于 2009-09-24T12:35:29.977 回答
0
<script type="javascript/text">
$( document ).ready( function() {

        @if (Request.Url.AbsolutePath.ToLower() == "/") 
        {
            @Html.Raw("$('.navbar-nav li').eq(0).attr('class','active');")
        }

        @if (Request.Url.AbsolutePath.ToLower().Contains("details")) 
        {
            @Html.Raw("$('.navbar-nav li').eq(1).attr('class','active');")
        }

        @if (Request.Url.AbsolutePath.ToLower().Contains("schedule")) 
        {
            @Html.Raw("$('.navbar-nav li').eq(2).attr('class','active');")
        }

    });
</script>

在 5 分钟内完成了这些,我可能可以重构它,但应该给你基本的想法,它可能对较小的站点最有用。

于 2014-03-12T17:01:58.703 回答