I need to retrieve the value in a hidden field (like Parent Id) in the parent view from a partial view. I searched everywhere but people seem to be doing it the other way around (access partial view elements from parent).
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The overall concept that I'm attempting to do is create admin panel that has multiple "forms" on a single blade view. Each "form" is a blade.php file that has a form that is model bound to provide quick access to the model data on load. For example, let's say that I'm running a manufacturing line and there are three models (subviews) that I want to #include() on manufacturing.blade.php.
Parent view (manufacturing.blade.php)
Subview - Start time (start-time.blade.php)
Subview - Throughput (throughput.blade.php)
Subview - Supervisor (supervisor.blade.php)
Each subview has a submit button on it that POSTS to the assigned resource controller. My problem is how do I successfully load manufacturing.blade.php and include form model binding when I never call the index controller on the subviews.
Is what I'm asking even possible?
For what it's worth I figured it out right after I posted the question. The variables required for the model binding inside the subviews were the problem. I was receiving errors about the variables not available, blah.... when I loaded the parent view page. Obviously the variables aren't available when I call the subviews because they were never pulled in from the parent view. In other words I'm trying to access something that isn't there.
Solution:
In the parent view loading controller, perform all the necessary db call to obtain/generate the objects required for the subviews. After the objects are obtained use
View::share('startTime', $startTime);
View::share('throughput', $throughput);
View::share('supervisor', $supervisor);
That method (view::share) allows that variable, 'startTime', etc..., to be shared across all the blade views that reside inside of parent. Just be sure you add the lines right before you return the intended parent view from your controller.
I have created a base viewmodel that all of my view models inherit from. That part is easy.
All views are bound to a viewmodel (all are inherited from the base view model)
Within the OnActionExecuted method I insert a true/false value onto a property within the baseviewmodel depending on some conditions.
From the view side of things. I have a single layout page that some how I want to be able to read the property's value and render a different partial view based on the value.
Is this possible? I dont want to have to add the code to each of the views but I don't think I should be binding the layout to my baseviewmodel either.
If I can stay away from inserting the value into the valuebag that would be great as I need to be able to access these values anywhere in the application via strongly typed names.
what you want probably isnt possible because as you call a view from the controller then first the code inside that view is executed and then the layouts code is executed
to achieve what you are doing you can do 2 things
1. make the logic inside the controller itself and then render the correct view
2.call the layout from the controller giving it the name of the partial view in some property of the model or in the viewbag
Not sure I quite follow the use case, but rather than trying to render out a partial view, have you thought about nesting your layout pages.
I think you should be able to override the layout in the onactionexecuted, so you can set the layout dependant on the bool and that layout will render only the correct option.
Look here for an example:
Nested layout pages with Razor
HTH
Si
I am aware of this question, but the original poster accepted a solution that didn't involve nesting. I definitely want to nest partial views (unless, of course, there's a better way.)
I have a page that can Ajax-load one of several partial views, depending on the user's actions in the main view. (The views are partial because my understanding is that if you want to load significant additional content from an Ajax call, you need to return a PartialViewResult from your call.) The several partial views have one common element, a dropdown, which I'd like to factor out into its own partial view.
But this isn't working. My partial views each have an associated view model, which is their model. For the nested partial view, I'd like to pass the value of a single field, a nullable int, from the parent view's view model, as the model for the nested partial view.
But at run time I get an error saying that my partial view needs a Nullable<int> but received X, where X is the type of the view model associated with the parent partial view.
So my question is twofold:
Is nesting partial views simply not allowed? (In which case, I wish the framework would check for the situation and throw an error that says so explicitly.)
Is there a way to get the effect I want, of a factored-out common interface element, other than with a partial view? I have considered, but not tried, creating an edit template, because I believed that what wouldn't work for partial views wouldn't work for those, but I could be wrong.
ETA: I found my problem: when you pass a null value for the model into HtmlHelper.Partial or RenderPartial, the rendering engine subsitutes the model of the calling partial view in place of that null, assuming that you simply didn't pass a model.
Which is not true in my case: my Nullable<int> is Nullable because, until it's set, it's null! The null is semantically meaningful!
But this is why I was having the problem.
Yes, you can nest partial views. Just make sure you pass in the correct model. HtmlHelpers are useful here, as you can encapsulate the call to RenderPartial with the full view path and ensure the correct model is used.
example
public static void RenderSomePartial(this HtmlHelper helper, int? i)
{
helper.RenderPartial("~/Views/Shared/SomePartial.cshtml", i);
}
Yes, you can. It can get a bit messy if you need to pass models around though. If you're using strongly typed models, try using DisplayTemplates or EditorTemplates instead of partials.
you can use render partial in your parent view and call some child view
also you can pass data with view bag
when you call a partial view from parent the data you pass from controller to parent view can pass to child view
i use the view bag to send my data to child view
This is all hypothetical, and wondering how and if this is possible.
I have two different strongly-typed views that use two different models. For example, I have a View1.cshtml, and View2.cshtml. Each has it's own model: View1Model.cs and View2Model.cs. Each of the view pages uses a common layout (_Layout.cshtml) that has a PartialView (_WhoAmI.cshtml).
In the View1Model.cs there is a UserID field (with various other fields) and the View2Model.cs also contains the same UserID (with different fields than View1Model.cs).
The partial view will lookup the UserID and display the User's information in a small display .DIV.
What is the best way to do this and keep the PartialView strongly-typed? Is it even possible when both models of the view are so different (other than the UserID)? If so, if I use this PartialView again in the _Layout, how do I keep it from doing the User lookup two times in the Layout page for each time the partial is called?
Thanks in advance!
Instead of Html.Partial you could use Html.Action and have a child action rendering the partial and doing the necessary lookups.
I assume that if partial view has model of type dynamic then what you ask might be possible, but haven't tried it myself. At least MSDN says that dynamic variables are bypassing static type checking and at runtime they are only checked for existence of specific methods that were called from code.
I've been tasked with converting an existing webforms application to mvc 3 razor.
The application currently has an aspx page which has a static header user control and "n" amount of other user controls which are dynamically created. In the code behind for the file, it is executing the below code in various specific sections to dynamically process user controls with information provided from the database.
I know how to statically create partial views, but being somewhat new to MVC, how would I go about defining this new "aspx" page and also to dynamically find, load and add the partial views (each equivalent to the below webforms code)?
btw, the code will be in C# as well.
Dim parent As Control = Page.FindControl(_moduleSettings.PaneName)
Dim portalModule As PortalModuleControl = CType(Page.LoadControl(_moduleSettings.DesktopSrc), PortalModuleControl)
parent.Controls.Add(portalModule)
I think I can do something like this when the page is rendering. I want to make it as simple as possible.
The "PaneName" will be set in the parent variable which determines where in the page it will be shown (Left, Right, or Main)
The "DeskTopSrc" is the name of the partial view to display.
So, take the code out of the code behind and place it in the main View. Perform the above processing logic in the View (boy, switching from aspx code behind to a View throws me a loop. I gotta get use to doing the processing in the View. Reminds me of Classic ASP, but the Razor syntax will help).
Display the partial view via the #Html.PartialView('partial view name'). This view might have a grid in it associated with a specific model.
Below is the part I am unsure about.
I've done database processing for a main View associated with a Controller, but not with a partial view that needs to do some database processing.
Perform any database processing logic (if any) for this partial view in the Controller associated with the main View (which contains this partial View).
In the Action Index method while looping over these "partial views", I can get the data and display the views....
Ahhh, I think I got it.....
After carefully thinking it through, if someone could help me out with the last statement here, I would greatly appreciate it.
1.Have partial views already statically created with the specific HTML markup that I need in the Views/Shared folder.
2.In the main View, I will already have
#Html.Partial(ViewData["partial_view_left"])
#Html.Partial(ViewData["partial_view_right"])
#Html.Partial(ViewData ["partial_view_main"])
statements in specific locations of the HTML which will render the partial views as I retrieve their names from the database.
3.In the Controller's Index method, I need to do the following:
a) Loop through the converted logic (from the CodeBehind of the existing WebForms page in the PageLoad event) in the Index action method of the new Controller which will load the partial views dynamically.
1) Find out where the partial view will be displayed (left, right, main) from the database via the "parent" variable.
2) Find out the name of the partial view that will be displayed from the database via the “DesktopSrc” variable.
eg: ViewData["partial_view_left"] = "left_view"; OR
ViewData["partial_view_right"] = "right_view"; OR
ViewData["partial_view_main"] = "main_view";
3) Right here is where I am unsure of how to properly display the partial view.
I need to have the equivalent of a webforms "Controls.Add" method to render each partial view from the Controller that I retrieve from
the database from step 3.a.2
What statement can I use in this Index method of the Controller that will accomplish this?
In other words, if I dynamically need to display several partial views inside of a parent view, how is this accomplished in MVC?
I know for each partial view, I can send over the model associated with it, but I just don't know how I can place several partial views inside the main view page at run time from one Action method.
If your partial views need to do some processing, like database retrieval, then you should use
#{Html.RenderAction("ActionName");}
This will call an action method (which doesn't have to be on the same controller) that can dynamically choose a view based on logic, and populate the ViewModel with data from the database.
public ActionResult ActionName()
{
var modelData = GetData();
return View(settings.DesktopSrc, modelData);
}