如何在ASP.NET MVC中直观地指示当前页面?

时间:2009-09-24 12:25:20

标签: css asp.net-mvc hyperlink selected

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可视CSS样式。 例如,在About页面/控制器中,我基本上想要这样做:

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

当然,当在主页上时:

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

(CSS样式名称当前在菜单中直观地指示这是当前页面。)

我可以将菜单div从主页面分成内容占位符,但这意味着我必须将菜单放在每个页面上。

任何想法,对此都有一个很好的解决方案吗?

5 个答案:

答案 0 :(得分:24)

最简单的方法是从ViewContext的RouteData获取当前控制器和操作。请注意签名的更改和使用@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,您可以将这个HtmlHelper扩展程序与@ Jon's结合使用,并使其更清晰。

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

MenuActionLink的位置

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 );
     }
}

答案 1 :(得分: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);
}

实施如下:

  <ul id="Navigation">
  <%=Html.NavigationLink("/Path1", "Text1")%>
  <%=Html.NavigationLink("/Path2", "Text2")%>
  <%=Html.NavigationLink("/Path3", "Text3")%>
  <%=Html.NavigationLink("/Path4", "Text4")%>
  </ul>

答案 2 :(得分:1)

如果您使用的是T4MVC,可以使用:

        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);
    }

答案 3 :(得分:0)

可能只是它是第5个参数,所以在你的html属性之前插入一个null。这篇文章就是这样描述的,虽然你可以在第4篇论文中传递一些东西,但第5篇专门用于HTML属性

答案 4 :(得分: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分钟内把它放在一起,我可能会重构它,但应该给你一个基本的想法,它可能对小型网站最有用。