Reasonably new to MVC. My problem is that I have a controller that has 3 different ActionResult's which are called depending on an enum.
All three action results return the same view but with different lists as the views model. In the view the user should be able to click on an item in the list and view the details based on the ID of the item.
e.g. Site/Facilities/Libraries returns the list of libraries, Site/Facilities/Libraries/1 returns the details. This works fine when you enter the full path but on the View itself clicking the anchor
#item.Name
on an item in the list returns the Url Site/Facilities/1 instead of Site/Facilities/Libraries/1. I cant use an ActionLink as the Action to call is dynamic. I know this could be solved by creating a different View for each type but I wondered if there might be another way?
Thanks in advance.
You can use such code (a javascript trick):
#item.Name
Or, if you want to use href property, you can use such code:
<%=Html.ActionLink(item.Name, "Facilities", ViewData("ActionName"), new {id = item.ID}) %>
(In that case you have to specify ViewData("ActionName") in controller).
I would suggest that you change it so that you only have one Action, but it takes an argument instead, and depending on the argument you push different lists to the View (perhaps using 3 different "helper-functions" instead). That's at least how I would implement what you are describing!
Good luck!
Related
My website is built around tabs. I have one single page with multiple partial views that display each tab.
The problem im facing now is I want to loop through files that the user has uploaded and display them in one of my partial views. This requires me to send the file list as a paramater in my action like this:
//Uploadedfiles is a function that adds the files to a list.
var files = UploadedFiles();
return View(files);
Because im only using one view to display all my partial views, i get:
The model item passed into the dictionary is of type 'Microsoft.WindowsAzure.Storage.Core.Util.CommonUtility+d__0`1[Delamapp.CloudStorageServices.UploadEntity]', but this dictionary requires a model item of type 'Delamapp.Models.LoginFolder'.
This means im required to not send a model item to my index view. Now, the only thing i can think off is adding my file list to viewbag and then display them on my view. BUT.. The files require high security. How safe is viewbag? Can you for example store sensitive login information in there? Can you think off some other way to accomplish this?
Thank you in advance
You can pass a model item to your view, but the model item you are passing doesn't match the type of model that your view uses (that's what the error message says).
So you need to do one of the following:
Modify your view to accept the model type that you are passing to it
Put the data you want to pass into the model type that your view is expecting
Create a new model type for both your data and for the view, and use that
In terms of security, I don't think using a view bag versus model binding really enters into the question of security. Both are just ways of passing data in between the controller and the view, and that all takes place within the ASP.NET process (perhaps you have ViewBag confused with Web Forms' ViewState?).
When a model is passed to view, the view has access to all data inside that model. But only for first time. When the view page is submitted say by clicking a submit button , then you don't get any data in the controller. For this you need to explicitly bind each and every model item either by giving a control to populate it or by using Html.HiddenFor(..)
But if my model is having a collection member which in turn having collection member .. upto level 3 or 4, then do I "have to" bind each and every member of these collections in order to get all data in action method after submit? If I am not displaying all these collections items on a view, then why should I bind it by writing huge code? But then I need them in the action method too. Is there any other simpler way to accomplish this other than explicitly binding it on view?
Following is the structure I have.
SalesModel
....IList HomeProducts
....int SalesID
Products
....int ProductID
....IList SecurityProducts
SecurityProduct
....SecurityProductID
....Description
....Price
....IList ProductFeatures
~ SalesModel is boud to aspx (View).
~ From this view, I have called partial view to show Home products (with model=Product).
~ From this partial view I have called another partial view (with model=SecurityProduct).
~ When I first time open the view, I get data at every level. But when I submit the view using submit button, then I dont get anything in SecurityProduct collection evern after binding every thing in FOR loop.
Thanks in advance.
yes, great example here: http://weblogs.asp.net/nmarun/archive/2010/03/13/asp-net-mvc-2-model-binding-for-a-collection.aspx
Resolved : by having hidden fields on both, the root level aspx and the child level ascx. Don't know how this resolves it but it solved the problem.
I have an action that depends on a list of integers. My first instinct was to simply declare the action with a List.
I tried declaring the action in the controller as:
public ActionResult EditMultiple(List<int> ids)
and in my View call like so:
<%= Html.ActionLink("EditMultiple", "EditMultiple", new { ids = new List<int> {2, 2, 2} })%>
Although it compiles the List is empty when I put a breakpoint in the action. Anybody know why or have an alternate approach?
Adding more detail about the scenario:
I'm trying to "Edit" multiple entities at the same time. I'm already at the point where I have an application that allows me to create/edit/view information about books in a library. I have a partial view that allows the user to edit information about a single book and save it to the database.
Now I'd like to create a View which allows the user to edit the information about multiple books with a single submit button. I've created an action EditMultiple which just renders the partial for each book (my model for this view is List) and adds the submit button afterwards.
Yes. The default model binder can bind "ids" to any ICollection. But you have to submit multiple parameters with the same name. That eliminates using the helper method "ActionLink". You can use url helper Action and append the ids to the link like so:
Test link
Here's the link from Haack's block.
I dont think
new List<int> {2, 2, 2}
gets properly converted into an POST that is bindable, you want to send
Ids=1&Ids=2&Ids=3
a comma separate list may also work, im not sure, i don't use the crappy default modelbinder.
Why are you doing that anyway? I hope thats pseudocode for something else...
This may be more of a best practice question.
I have three views (create/details/edit) that all link to their own results view (createResults/detailsResults/editResults). Each results view shares a partial with a results table on it.
When a user submits one of the three (c/d/e) views, should each results view have its own action, even tho the action will quite literally do the exact same thing (search on the information on the c/d/e view)? I'd rather not duplicate this code if not necessary.
Should I have one action, and pass in something that tells the action which results view to direct to? Is there an easy way to get the referring view in the action?
If you have 3 actions you don't need to duplicate code. Why not refactor the common code into a single private method on the controller, or perhaps even move it into an action filter?
I would make a single action with a string parameter containing the view name.
You can play with the routing table to make the URLs prettier.
What is the correct way to dynamically change the View (the view aspx) that a controller method uses versus using the standard naming convention.
I'm guessing it has something to do with the ViewResult and ViewName, but what is the correct syntax?
Update:
One thing I forgot... is there a way to do this without having the "action" or method name not be part of the resulting URL?
For example,
If I wanted to have a list of all the states in the USA.
http://localhost/list/states
(displays a simple list of state names)
And If I wanted to have a list of the 50 largest cities in the USA.
http://localhost/list/largest-cities
(displays the city and the population - two column grid)
So I'd like to be able to pull in different "formatters" depending on the list name.
Should I do that in a single action / multiple views?
Could I then use Routes to hide the View name in the URL?
What is the best way to approach this?
Just use the method that takes the name of the view to choose. Be careful, though. Most times what you probably want to do is redirect to a different action instead. Returning a different view won't change the url like redirecting will.
string name = ...figure out which view you want...
return View( name );
If you need to render a different view from a controller action dynamically, you can simply supply a value to the base.View() method (or the ViewResult constructor). The location of the view will always be (for the web forms view engine):
/Views/{Controller}/{View}.aspx
Edit: (Thanks to Ithi) It could also be in:
/Views/Shared/{View}.aspx