Does a MasterPage know what page is being displaye

问题:

When I navigate on a website utilizing MasterPages, does the application know what page I am on? If so, does it store it in an object I can access?

The reason I am asking is so I can replace this:

//masterpage 
<div id="nav_main">
   <ul><asp:ContentPlaceHolder ID="navigation" runat="server">                    
   </asp:ContentPlaceHolder></ul>
</div>

//content page(s)
<asp:Content ContentPlaceHolderID="navigation" ID="theNav" runat="server">
   <li><a href="default.aspx">Home</a></li>
   <li id="current"><a href="faq.aspx">FAQ</a></li>
   <li><a href="videos.aspx">Videos</a></li>
   <li><a href="#">Button 4</a></li>
   <li><a href="#">Button 5</a></li>
</asp:Content>

With a more elegant solution for the navigation, which highlights the link to the page by having the list item's ID set to "current". Currently each page recreates the navigation with its respective link's ID set to current.

回答1:

I'd concur with Chris: use a control to handle display of this menu and make it aware of what link should be highlighted. Here's a method I use regularly. It may become more complex if you've got multiple pages that would need the same link styled differently, but you get the idea.

Dim thisURL As String = Request.Url.Segments(Request.Url.Segments.Count - 1)
Select Cast thisUrl
   Case "MenuItem1.aspx"
       lnkMenu1.CssClass = "Current"
   Case "MenuItem2.aspx"
       lnkMenu2.CssClass = "Current"
End Select

回答2:

To get the current request URL from within the master page you would do:

string s = this.Page.Request.FilePath; // "/Default.aspx"

I also recommend moving your navigation into the master page instead of the content page. This will make it easier to maintain / access.

回答3:

Yes, Use the below code in your master file. It will give you the content page name.

Page.ToString().Replace("ASP.","").Replace("_",".")

回答4:

You should be able to get the page by accessing the Page property. IE:

string type = this.Page.GetType().Name.ToString();

回答5:

You'd probably just use one of the Request path from within the master page to set the current. I'd probably also have a property on the master page to override it, so that pages without links or something could set it to something reasonable.

回答6:

It worked for me this way - Thanks Jared

This is what I did to get our nav menu to highlight the current menu item for the page that we are viewing. The code is in the master page. You basically get the filepath (Jared's way) We use the "~" in our links so I had to strip that out. Iterate the menuItems collection of the Menu control. Compare the navigateUrl property.

(I'm not the best coder and even worse at explaining - but it works and I was quite chuffed with it!)

protected void HighlightSelectedMenuItem()
    {
        string s = this.Page.Request.FilePath; // "/Default.aspx"
        string nav;
        if (s.Contains("~"))
        {
            s = s.Remove(s.IndexOf("~"), 1);
        }

        foreach (MenuItem item in navMenu.Items)
        {
            if (item.NavigateUrl.Contains("~"))
            {
                nav = item.NavigateUrl.Remove(item.NavigateUrl.IndexOf("~"), 1);
                if (s == nav)
                {
                    item.Selected = true;
                }
            }

        }
    }

回答7:

string s = this.Page.GetType().FullName;
string[] array = s.Split('_');
int count = array.Count<String>();
string currentPage = array[count - 2];

回答8:

Alternatively you can search for page title if you have set an specific title to the child page instead of masterpage try:

this.Page.Title

Hope it helps.

回答9:

this is in C#

string thisURL = Request.Url.Segments[Request.Url.Segments.Length - 1];
        if (thisURL.ToLower()== "default.aspx") li1.Attributes.Add("class","yekan active");
        if (thisURL.ToLower() == "experts.aspx") li2.Attributes.Add("class", "yekan active");

回答10:

The navigation control, not the master page, should be in charge of what page is currently highlighted.

Either the page that is loaded should notify the navigation item who it is, or the nav control itself should keep track of it.

The point is that master pages are supposed to simply be a holder that content is displayed in. They aren't supposed to control anything.

回答11:

try

this.Page.Master

It will get you the master page of the current page.

回答12:

There's also the Request.RawURL