In _Layout.cshtml is it possible to determine what View is going to be rendered in #RenderBody() ?
You can get the View (i.e. Index.cshtml) through ((RazorView)ViewContext.View).ViewPath
Example for your needs:
<script type="text/javascript" src="~/Content/Scripts/#(Path.GetFileNameWithoutExtension(Server.MapPath(((RazorView)ViewContext.View).ViewPath))).js"></script>
If you need your actual View (i.e. _Layout.cshtml), you can use VirtualPath instead.
Old answer
Reading your comments, you want to add a
<script ...>...</script>
depending on the view but outside of #RenderBody()?
Then put
#RenderSection("Scripts", required:false)
and in your view define the section like
#section Scripts {
<script ...>...</script>
}
So you don't need to maintain your _Layout.cshtml since every View defines their own scripts.
Here is an easy explanation: http://weblogs.asp.net/scottgu/asp-net-mvc-3-layouts-and-sections-with-razor
What you can do is check Html.ViewContext.RouteData.Values. That's a dictionary with controller, action, and id (as necessary).
Read this article and it will solve your problem.
Edit
RenderBody
What is RenderBody?
In layout pages, renders the portion of a content page that is not
within a named section. [MSDN]
How RenderBody works (graphical presentation)?
The #RenderBody() renders the view controlled by the controller. so if your controller is like this.
public class HomeController : Controller
{
public ActionResult Index() // Renders File /Views/Home/Index.cshtml
{
return View();
}
}
Then the public ActionResult Index() Index.cshtml will be the view it will render located int the /Views/Home folder.
You can add to the Index.cshtml or _Layout.cshtml view to render other Views or partialViews By adding #Html.Partial("_MyView") as shown below.
#Html.Partial("_LayoutHeaderHeader")
#Html.Partial("_LayoutHeaderNavbar")
Sometimes it is easy to setup a few layout pages to call from different Views.
If you want to call scripts to you View you should always create a _PartialView and place your scripts in the partial view and call that View at the bottom of your View like this #Html.Partial("_MyView") and the scripts will set properly.
Here is a good tutorial. http://www.codeproject.com/Articles/698246/ASP-NET-MVC-Special-Views-Partial-View-and-Layout
If you derive all your models from a base model then you could add a property to you base model that returns the controller name, which you can get using
this.RouteData.Values["controller"].ToString();
It would be even better if you had a BaseController class because you could put this in the constructor and never have to touch it again.
Since you would be returning a descendant of the base Model to your index page which has the controller name, now you could use some scheme base on #Model.ControllerName. If your controller services multiple views the property could be updated to indicate a certain view name.
I don't think you can get the name of a Partial inside the index unless you use jquery and by that point the page resources have already been loaded.
Edit: One other trick would be to create your own version of #Html.Partial() HtmlHelper class. So you have #Html.MyPartial("ViewName") and inside that method call the internal function that generates Html.Partial and then inject your dependencies.
EDIT: I just read your comments about the issue and think that the better way is using the code snipplet provided by #Matt in another answer.
You can use the #section razor statement inside your view to inform wich script should be loaded.
Layout template placeholder
#RenderSection("scripts", required: false)
View Code
#section scripts {
<script src="~/Scripts/custom-imgedit.js"></script>
}
The example above inform that the custom-imgedit.js will be loaded in the render section placeholder. Note: You can even use bundles like #Scripts.Render("~/bundles/myCustomScripts")
Related
I have a partial view for ViewBag.count, which is defined in the ShoppingCartController. The problem is that the ViewBag will only show when you are on the ShoppingCart View. I want the ViewBag to be seen on all views. How do I fix this? I am currently rendering the partial like this:
#Html.Partial("_ShoppingCart", new List<bytme.Models.ShoppingCartModel>())
The partial view called _ShoppingCart:
<span class="badge">#ViewBag.count</span>
You should create a seperate action method which returns HTML markup needed to render the cart section of your page and include that in all your view using Html.Action method.
You may also decorate this action method with ChildActionOnly attribute so that users's cannot directly access this action method by requesting the url /ShoppingCart/Cart.
[ChildActionOnly]
public ActionResult Cart()
{
ViewBag.ItemCount = 2; // replace hard coded value with your actual value
return PartialView();
}
and in your partial view (~/Views/Shared/Cart.cshtml), you may write the HTML code which is needed for the cart segment of the page.
<span class="mycart">
Total items in cart #ViewBag.ItemCount
</span>
Here we are using ViewBag to pass the item count numeric value from the action method to it's partial view. But you may use a view model and use the strongly typed view approach to pass data from your action method to the partial view (this is my preferred approach).
Now in other views/layout file where you want to render the cart HTML, you can call the Html.Action method
<div>
#Html.Action("Cart","ShoppingCart")
</div>
<h1>Welcome to my site</h1>
When razor execute your view, it will see this Html.Action method and that will be executed and the output of that (the HTML markup generated fro the action method), will be included in the final output generated for the current view.
I am using the PartialView method, so that it will not try to execute the Layout code. (People make this mistake and gets an infinite calls to the Cart action method.
For Asp.Net Core projects
If you want to do the same thing in asp.net core projects, you may use View components to achieve the same results.
Create a view component to render the cart.
public class CartViewComponent : ViewComponent
{
public IViewComponentResult Invoke(string name)
{
var totalItemCount = 3;
return View(totalItemCount);
}
}
Create a razor view for this view component with the name Default.cshtml inside ~/Views/Shared/Components/Cart directory and you can have your razor code/HTML markup inside that to render the desired HTML. In this example, I am using a strongly typed approach where my view is stongly typed to int type and I am passing an int value from the the Invoke method when calling the View method.
#model int
<span>
Total items : #Model
</span>
Now you can invoke this view component in other views/ layout file by calling the Component.InvokeAsync method.
<div>
#await Component.InvokeAsync("Cart")
</div>
<h1>Welcome to my site</h1>
I have a problem with rendering JavaScript file in _Layout.cshtml.
#section Scripts {
<script src="#Url.Content("~/Scripts/Custom/productsSuggests.js")"></script>
}
When I paste it to Index.cshtml (Home) it works, but only on this page. I need this script to work globally. I have partial view SearchBox in HomeViews catalog, and Controller Action in HomeController.
Because you are in the _Layout.cshtml view, it is likely the top level view. A section is a placeholder in a parent view.
Instead of your current code, try
#Scripts.Render("~/Scripts/Custom/productsSuggests.js")
In the Layout.cshtml you can use: #Scripts.Render("YOUR BUNDLES")
When will be add layout to another page this bundle will be global work.
I have a pretty intensive call to a Child Action, with a massive amount of c# code simply called in a few views by:
#Html.RenderPartial("mychildAction")
Now I need to load some javascript file whenever this action is called. I can not put the tags inline (inside the view) because Jquery (and other JS libraries) aren't loaded until the end of the html page.
The (master) _layout should be aware that this ChildAction was called. But it isn't because a Child Action gets a new HttpContext.
The only solution I came up with, is to switch to a partial (including a big chunk of c# code into the partial and add a few strings to some custom object kept in the HttpContext.Current.Items and make my _Layout act appropriatly). But doing so would mean I have no output caching on this ChildAction and I throw in bad practices like code in partials.
What is the best way to handle this scenario?
You can access the HttpContext from the calling action using
Html.ViewContext.ParentActionViewContext
So one could add something to the "Items" collection there, this approach could solve this particuliar issue, but I still wonder if it's the best approach.
The View is responsible for rendering scripts and since the view knows when to render the partial view, it knows when to render the scripts for it.
In your layout you might find this:
#RenderSection("scripts", required: false)
The view can load scripts there like this:
#section Scripts
{
#Scripts.Render("~/bundles/SomeBundle")
}
This allows the calling view to render scripts.
What is not possible is to render scripts from a partial view or a sub-view.
You might find some workarounds on how to render scripts from a partial view, but in general is the responsibility of the view to know which scripts to load.
edit
Some of the workarounds I've seen are here.
I agree with #Odys
_Layout.cshtml
#RenderSection("scripts", required: false)
ChildView
#{
Layout = "~/Views/Share/_Layout.cshtml"
}
#section scripts
{
<script></script>
}
I have a Model that loads the Sidebar for my webpage, along with a Model that loads the main content. The content Model will be different for each page whilst the Sidebar model will remain constant. The content Model will change by the user clicking links:
~/Home/About
~/Home/Contact
What I ideally want to to put a line of code in _Layout.cshtml that loads a Controller that returns a PartialView displaying the Sidebar Model. So we might have:
<div id="sidebar">
#Html.Render("~/SidebarController/GetSidebar");
</div>
<div id="content">
#RenderBody()
</div>
But I know this won't work. How do I achieve this?
What I would do is to use #Html.Action("GetSidebar") in the _Layout.cshtml file, then you can have an action in your controller
public ActionResult GetSidebar()
{
//do stuff, populate menu items from database? etc
// Pass the data to the partial view
return PartialView("_Sidebar");
}
You would need this in each of your controllers unless you put this in a base controller, which you can then inherit on all your other controllers and add [ChildActionOnly] to the top of your action so that it can not be called directly.
I do the same thing you are trying to do. I use:
#Html.Action("GetSidebar", "SidebarController")
to draw my side bar and it works fine. I use ajax calls when changing views though so as to save on loading the sidebar over and over again and I have the ajax target the "content" div replacing its content with the partial view that represents each page.
I need to display a list of comments within a view. I have created an editor template for the Viewmodel type of my Comments. I call:
#Html.EditorFor(x => x.Comments)
To loop through and render the indiviudal comments.
Now, I also need to add a comment to the list. After adding to the DB i need to use jQuery to append the new comment view to the current list.
Should I create another partial view to mirror the EditorTemplate view...Or just call Html.RenderPartial on the new view within the editor template in the first place?
Hope that makes sense..
Each view (be it a partial or not) has its own html helper Property. Using this property You can and call partial views to arbitrary depth. In your Situation i would suggest creating Display Template for comments because you are displaying them not editing them. it will create no difference in terms of functionality whatsoever but it violates the convention. For example this is your display template for comments accepting IEnumerable
<%foreach(var x in Model){%>
<div> #x.CommentText</div>
<%} %>
Then you can have a partial view rendering the form to add new comment which you can place in another partial view called comment accepting Model of type Comment e.g
<%Html.BeginForm();%>
<div><%:Html.HiddenFor(x=>x.CommentID)%>
<%:Html.LabelFor(x=>x.CommentText)%>
</div>
<div>
<%:Html.TextAreaFor(x=>x.CommentText)%>
<input type='submit' value='save'/>
<%:Html.Endform();%>
i would personally call this view (rendering the form) from main view (from which i called Html.DisplayFor(x=>x.Comments)) because it is a concern separate from displaying list of comments.
I would just create a partial view with:
#model SomeModel
#Html.EditorForModel()
and use that if i needed to return PartialView() from an action method.
You can be lazy and use the same template by providing a model of an IEnumerable containing one comment.
jQuery provides a way to pick out a fragment from an AJAX response. See "Loading Page Fragments" here. Just add a selector for your one comment and add it to the list.