How do I create a menu in a ASP.NET MVC2 Master Page, dynamically based on the current user's "role"?
The simplest and most straightforward way would be to simply add an if statement in the view markup:
<% if (Page.User.IsInRole("Admin")) { %>
<%= Html.ActionLink("Admin Tools Index", "Index", "Admin") %>
<%= Html.ActionLink("Admin Dashboard", "Dashboard", "Admin") %>
<% } %>
Or, you can separate out several items pertaining to a specific role into a partial view:
<% if (Page.User.IsInRole("Admin")) { %>
<% Html.RenderPartial("AdminMenu"); %>
<% } %>
I'm not sure about MVC but in 'normal' ASP.NET it is possible to select a MasterPage at runtime.
If you are using the sitemap file to generate menus then you can probably do it in there. If not, then it depends.
Related
I want to call one div when the page is default.aspx and to call same div at the same time when the page is another page than default.I have done something like this but is not doing correctly.
<% if(string.Compare(Request.Url.LocalPath,"/default.aspx")==0 || string.Compare(Request.Url.LocalPath,"/") ==0)
{%>
<div class="temples" >
<% } %>
<% else
{ %>
<div class="temples" style="display:none";>
<% } %>
You can try like this:
string s = this.Page.Request.FilePath;
This will get you the current request URL from within the master page
Also check the IsMasterPage property:
Gets a value that indicates whether or not a child element in the
viewer should be used as a master page.
There is a property IsMasterPage to define whether your control element associated to master page. Below is a link to get more information.
DocumentViewerBase.IsMasterPage
I'm developing a front-end part of an application right now, and a question came to my mind.
What is the difference between asp.net special tags:
<%= %>
<%# %>
<%# %>
And if exists another special tag please describe its function.
<%= prints the raw value of the expression within.
This syntax can cause XSS vulnerabilities and should not be used.
<%: prints and HTML-escapes the value of the expression within.
<%# is like <%=, but is used for data-binding
<% executes a block of code and ignores and return values
<%# is used for directives like Page or Imports.
Check the below site Once..You will get an idea
http://naspinski.net/post/inline-aspnet-tags-sorting-them-all-out-(3c25242c-3c253d2c-3c252c-3c252c-etc).aspx
These are some useful special tags
<% %> An embedded code block is server code that executes during the page's render phase. The code in the block can execute programming statements and call functions in the current page class. http://msdn2.microsoft.com/en-gb/library/ms178135(vs.80).aspx
<%= %> most useful for displaying single pieces of information. http://msdn2.microsoft.com/en-us/library/6dwsdcf5(VS.71).aspx
<%# %> Data Binding Expression Syntax. http://msdn2.microsoft.com/en-us/library/bda9bbfx.aspx
<%$ %> ASP.NET Expression. http://msdn2.microsoft.com/en-us/library/d5bd1tad.aspx
<%# %> Directive Syntax. http://msdn2.microsoft.com/en-us/library/xz702w3e(VS.80).aspx
<%-- --%> Server-Side Comments. http://msdn2.microsoft.com/en-US/library/4acf8afk.aspx
<%: %> Like <%= %> But HtmlEncodes the output (new with Asp.Net 4). http://weblogs.asp.net/scottgu/archive/2010/04/06/new-lt-gt-syntax-for-html-encoding-output-in-asp-net-4-and-asp-net-mvc-2.aspx
<%= %> Code Render Block - For evaluate inline expressions
<%# %> Directive Syntax - Usualy for linking the codebehind and a
asp.net page.
<%# %> Data binding
You can find more information at:
http://msdn.microsoft.com/en-us/library/fy30at8h(v=vs.85).aspx
Is there is a way to get the current user in the aspx page,the page with the html definitions? (i know how to get it in the aspx.cs page)
This should work:
<%= Page.User.Identity.Name %>
Page.User Property
Use the following code block in the aspx where you want it to show up.
<%= System.Environment.UserName %>
See ASP.NET "special" tags for more info.
Use code tags
<%= YourMethodToGetTheCurrentUser() %>
You can access any public or protected variable from the code-behind file in it's .aspx file by wrapping your code in these characters:
<% if(PublicObject.Property > 0) { %>
<p>You can write normal HTML, or write strings like this: <%= PublicObject.Property %></p>
<% } %>
<% %> let's you add logic or commands into a page. You can use this to add for loops or if statements. <%= %> is used to write content directly to the page. This is used to print the contents of a variable.
<%= System.Web.HttpContext.Current.User.Identity.Name%>
Yet another one:
<%= HttpContext.Current.User.Identity.Name %>
I want to insert a user control on to a master page
The user control is a basic menu that lists categories of items
I want to pull the category list dynamically from SQL Server
I can do this in web forms using code behind, but how do you go about this in MVC?
Thank you
Categories.ascx:
<%# Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %>
<ul>
<% foreach (string category in Model.Categories ) { %>
<li>
<%= Html.Encode(category) %>
</li>
<% } %>
</ul>
I would make a base controller for all the controllers that will use your MasterPage. In that base controller I would load up your list of data to create the menu (from a cache, sql, whatever) and store it in ViewData.
If you want to you could also make a base model for all your models that will be loading your views based on the controller as well and then you could just load it directly into the models that extend this base class.
Assuming your went the easier ViewData route, in your user control you can just access the ViewData and load your menu since you can assume that all your contorllers will have pre-loaded this data.
this is in your Controller:
ViewData["CategoryList"] = _categoryService.GetCategoryList();
this exists in a file called NameOfMyPartial.ascx:
<%# Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %>
<% foreach (var category in (IList<Category>)ViewData["CategoryList"])) { %>
// do stuff with category
<% } %>
Then in your Master page:
<% RenderPartial("NameOfMyPartial"); %>
This seemed easier in Web Forms; I'd have a user control, with the logic in the code-behind, and I could just drop it on a page.
But apparently code-behinds are a no-no in MVC, and the logic is in controllers. I'm a little confused about how logic for a user control is "wired up".
I want to display an RSS Feed user control. So I have a page:
<%# Page Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage" %>
<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
Home Page
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<p>
<% Html.RenderPartial("RssFeed"); %>
</p>
</asp:Content>
I have my user control:
<%# Control Language="C#" Inherits="System.Web.Mvc.ViewPage<SyndicationFeed>" %>
<%# Import Namespace="System.ServiceModel.Syndication" %>
<p>
<%: ViewData.Model.Title.Text %>
</p>
<div>
<% foreach (var item in ViewData.Model.Items)
{
string url = item.Links[0].Uri.OriginalString;
%>
<p><a href='<%= url %>'><b><%= item.Title.Text %></b></a></p>
<% } %>
</div>
And I have this code that I need to run to get the rss data:
using (XmlReader reader = XmlReader.Create(ConfigurationManager.AppSettings["RssFeed"]))
{
SyndicationFeed rssData = SyndicationFeed.Load(reader);
return View(rssData);
}
But where does it go? In the controller for the page that contains the control?
To sum it up, this is how you can do it
[HttpGet, ChildActionOnly]
// put this in RssController
public ActionResult RssFeed()
{
// prepare the model
SyndicationFeed rssData;
using (XmlReader reader = XmlReader.Create(ConfigurationManager.AppSettings["RssFeed"]))
{
rssData = SyndicationFeed.Load(reader);
}
return PartialView(rssData);
}
Usage:
<% Html.RenderAction("RssFeed", "Rss"); %>
And put a check into your ASCX if the Model you are sending in is null and if so, skip everything so it won't render anything. If you leave it like you have it now, it will end in an exception if the Model sent in is null.
Based on my understanding.... Yes, it can go in the controller in the page that contains the control. The partial can use the parent's ViewModel
See here (the bit on Partial Views)
http://msdn.microsoft.com/en-us/library/dd410123.aspx
EDIT
To include your RSS feed
If my controller were named RssController and it had a ViewResult method named RssFeed, I'd include the following on the .Master.
This causes the RssController to get invoked and return the view for your partial (assuming that's what View(rssData) sent back.
In ASP.NET MVC 2+, you can use Html.RenderAction to render an action's result inline.
Giving the action a [ChildActionOnly] attribute will prevent users from navigating to the action normally, making it usable only in this kind of "child" context.
I had a vaguely similar problem (using Razor view engine) which I solved by putting the code into the page since there wasn't anywhere else I wanted to put it. Mine actually related to rendering a menu.
The trick is to use the #functions { ... } construct.
Some pertinent info about the layout stuff here: http://weblogs.asp.net/scottgu/archive/2010/10/22/asp-net-mvc-3-layouts.aspx
Kind of like this in your case (not exactly right; it's late and I'm not on my dev box, but it hopefully gives the idea). That way you don't need any RSS controller at all if you are only doing this small piece of RSS related stuff.
#foreach (var item in RssFeed().Items)
{
<p><a href='#item.Links[0].Uri.OriginalString'><b>#item.Title.Text</b></a></p>
}
#functions {
public SyndicationFeed RssFeed()
{
using (XmlReader reader = XmlReader.Create(ConfigurationManager.AppSettings["RssFeed"]))
{
return SyndicationFeed.Load(reader);
}
}
}