MVC :: Persisting Model State Across Requests?
Jan 3, 2011
I'm building a web application that has a particular model representing some events. Users need to be able to add N number of people to a given event. Choosing people is handled by a partial view.
I'm trying to build a menu that displays when users click "add a person" to the event. Because the event hasn't been filled out completely yet, there is nothing in the database to persist between requests.
I also have validation logic on the event page.
My proposed solution is to add the form to search or add for people on the event form itself and have a submit button that sends the values that have been added back to the server, where I can store them in ViewData or Session.
Unfortunately, doing this flags the validation.
My second solution is to load a partial view responsible for loading the UI to add/search for a person. I could add a little code on the method in the controller that returns a partial view storing the existing data in a session variable or viewdata. Trouble is, I have to submit the form to do it--again tripping the validation!!!
I'm wondering if perhaps I chose the wrong tool to do this...because in webforms, there would probably be a postback and you would just perform an operation on that postback. I'd like to avoid rewriting the application in webforms and am wondering if there are ways I'm overlooking in ASP.NET MVC.
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Mar 23, 2011
Suppose I have created a spgridview with the following code.
[Code].....
To persist the checkbox states between pagebacks ,currently i am using session states.It has some draw backs.Now how can I persist the checked states,when the user manually checks all the checkboxes,how can i make a check on the header checkbox?
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Nov 5, 2010
I wish to persist a class object across postbacks by using a single session variable/object/whatever.
The class has about a dozen single variable properties; and about a dozen table properties; and several methods. The main table tracks rows of sporting event results. The web site will collect one row at a time for each postback. The data in the object's constructor is based on a dataset, but the data in the class will grow each time I do a postback so I don't want to loose the information in the class. The data isn't very big - it will fill a single computer screen.
Being new to programming I am thinking that I can store the dataset in the session but that would slow down the response time because I the methods would have to be called to refine the data - or maybe I can just store the entire class object in a session.
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Jun 17, 2010
got [URL] - two separate apps in IIS.
Want the forms based auth to persist (they use the same database for membership)
I tried to simply add a "." before the domain name in the forms tags (see below for example) - but this didn't work - it acutally prevented me from logging in at all. how i can persist the login? Does the admin need the same values for "name", "path" and "domain" as the main site?
[code]....
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Feb 17, 2010
I'm writing an ASP.Net application (no AJAX, but maybe) and there's a requirement to have a list of companies graded under a traffic light system. I intend to have these in a collapsible hierarchical list on the Master page, e.g. Red expands to show companies, and then companies can be further expanded.
how can I keep the expanded list in the same place, with the same content visible, between page loads?
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Jan 3, 2011
I'm building a web application that has a particular model representing some events. Users need to be able to add N number of people to a given event. Choosing people is handled by a partial view.
I'm trying to build a menu that displays when users click "add a person" to the event. Because the event hasn't been filled out completely yet, there is nothing in the database to persist between requests.
I also have validation logic on the event page.
My proposed solution is to add the form to search or add for people on the event form itself and have a submit button that sends the values that have been added back to the server, where I can store them in ViewData or Session.
Unfortunately, doing this flags the validation.
My second solution is to load a partial view responsible for loading the UI to add/search for a person. I could add a little code on the method in the controller that returns a partial view storing the existing data in a session variable or viewdata. Trouble is, I have to submit the form to do it--again tripping the validation!
I'm wondering if perhaps I chose the wrong tool to do this...because in webforms, there would probably be a postback and you would just perform an operation on that postback. I'd like to avoid rewriting the application in webforms and am wondering if there are ways I'm overlooking in ASP.NET MVC.
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Jan 2, 2011
I am using this code to pass variables from ASP.NET application to HTML Application:
[Code]....
The above code is run from page_laod event, and I am making some development changes on the Development Machine (say
http://eutdev02/ehrmd).
After the ASPX page is loaded, and I debug the javascript in the HTML (F12 under IE8), and can see the Cookie is found in the browser.
But, when I open the target HTML/Javascript web page (which will read the cookie prmStaffID), but the HTML Page is on the production machine (separate server say
http://prod01/Attendance.html), the Cookie is not found !!!
It seems to me that Cookies will persist only on one IIS Server, and will not be global.
Question:How I can persist the Cookie on the Client Machine regardless of the the Server Machine ?
For testing purposes, I want to send the cookie to the client from teh Development Server, but the target application is under HTML/Javascript, and I want to be able to read the same Cookie using Javascript.
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Jan 25, 2011
just been trying to recieve the session value from multiple jquery ajax requests on the same domain name. i think i understand that each request is kind of a virtual browser request so the session is mutally exclusive to each request, but there must be a way some how, has anyone solved this. Basically this is what im trying to do:
I have tries using type: GET and POST but still no luck.
First request - Stores the product id in a session
[code]....
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Oct 19, 2010
I've created a visual webpart .My user control is gridview,in which one of the column is checkbox.The checked state of my checkbox within a gridview get disappeared during postbacks. I want to maintain the checked state.
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Feb 9, 2010
I've a checkbox with autopostback=true. If i check the checkbox the postback occurs and changes a label text. But if i click back in the browser the checkbox is not returning to its previous unchecked state. How can i bring back its state?
Can i write some JavaScript to persist the state of a control?
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May 13, 2010
I have a simple user control containing two text boxes which I am adding to placeholder on Button Click event. I am storing the number(count) of clicks in View state and running a loop using count to create all previously added user control. I am also adding IDs to each User control (appending "UC" and count). I have also checked in view source the ids are same each time they are created. I have another button which basically does an post back. I have EnableViewState enabled ="true" in all controlls all the way up to Page Level. My problem is that User Input does not persist on postback. Should this not be happening automatically for me?
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Feb 23, 2010
i'm just sending a normal POST request using Ajax.BeginForm... i output the form elements using the .TextBoxFor and .HiddenFor etc... all as i should... and when it's posted via ajax to my action method, the object in the action method (named "Comment") is not populated with the values!
Am i missing something? here is the relevant part of my code to those who want to see it...
[code]....
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Oct 12, 2010
how can DropDownList attributes be persisted accross page Postbacks?
Example:
DropdownList1.AutoPostBack = True
DropdownList1.items(0).Attributes.Add("Attribute1","somevalue")
On Postback the attribute is no longer available (ie. attributes.count=0).
I tried persisting using the code below, but was unsuccessful:
Before PostBack: ViewState.Add("DDL","DropdownList1")
On PostBack: DropdownList1 = ViewState("DDL")
This generated the error: DropDownlist is not marked as serializable.
I than tried:
Before PostBack: Session.Add("DDL","DropdownList1")
On PostBack: DropdownList1 = Session("DDL")
This did not err but attributes were still not available.
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Jan 20, 2011
I read this article first to try to solve this issue, but I am already loading the controls in the Init phase of the page, yet viewstate is not persisting. Any ideas as to why? (Of note is that this is for a custom module in DNN and I do have some AJAX update panels on the page, though this section is not within an update panel, for what it's worth.)
As an overview of what I've got:
1. LoadControl.ascx - based on reading query string parameters, determines whether to load the master or the detail .ascx.
2. Master.ascx
3. Detail.ascx
In my master control I dynamically load either a master or detail sub-control in the page_Init. The detail page has a treeview control and then uses a multi-view control to display the panel associated with the depth of the node selected on the tree. On the panel being displayed I have a cascading ddl within a detailsview control which initiates a postback to select the child ddl based on the parent ddl selection. However, when the page refreshes after the postback, both ddls have resorted to their default selection.
What is interesting however, and I just realized this as I am typing, is that the Treeview is populated when the page comes back from the postback, so that is only possible if viewstate is being persisted right? (See the page_load code and you'll see that Call PopulateRootLevel(intTreeUserID) which populates the treeview, is not called on postbacks....hmmm.
Any ideas as to why the treeview maintains viewstate but not my ddls???? But though the tree is populated, I do have to explicitly select the node again and set the panel that the detailsview control is on to visible again too....
Here is the dynamically loaded control code:
[Code]....
And in the Detail.ascx page load I've got:
[Code]....
[Code]....
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Aug 2, 2010
when I use Html.HiddenFor( model => model.OwnerId ) to create a hidden field, the value assigned to that field is zero. When I use <input type="hidden" value="<%: Model.OwnerId %>" /> to add the hidden field to the form, the value is assigned correctly.
Why would Html.HiddenFor( model => model.OwnerId ) not get the correct value from the Model object? Am I supposed to load model state somehow separate from returning the model object from the action method? Here is the view:
[Code]....
The Create action method is relatively straight forward.
public ActionResult Create( ... )
{
ViewStockItem item = new ViewStockItem();
item.ActionCode = ActionCode.Add;
if (item.OwnerId == 0)
item.OwnerId = 7;
BookOwner owner = db.BookOwners.Single(c => c.OwnerId == item.OwnerId);
item.OwnerName = owner.OwnerName;
return View(item);
}
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Aug 5, 2010
I have been spending a better part of a week trying to track down why I am not able to clear all session variables in a web app (vs 2010, vb.net). What I have tracked it down to is that when I remove or abandon sessions that my html pages or codebehind access, it works, but for some reason in any of my class files where I use "Public Shared strConnection as String = HttpContext.Current.Session("strConnection").ToString" to access a session variable, it finds the old one and not the current one. I have to wait for it to time out, go in again, and it will find the new one.
I do not use Linq, and there is only one place in the whole web app that I place the connection string in a variable whcih is when a person logs in. It points them to the correct database. The sqlconnection is set for all of my listviews in Page_Init to make sure that they aren't using any session variable that they create on their own. Interestingly enough that if I use debug to go in each time, exit debug, enter debug again trying to access a different database, it works correct each time. I assume that debug is correctly killing the session variable for the classes for me.
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Mar 21, 2011
<%= Html.ValidationSummary("Account creation was unsuccessful. correct the errors and try again.") %>
</div>
<% using (Html.BeginForm("Register", "Account" , FormMethod.Post))
{ %>
<div>
<fieldset>
<legend>Account Information</legend>
<p>
<label for="username">User Name:</label>
<%= Html.TextBox("username") %>
<%= Html.ValidationMessage("username") %>
</p>
<p>
<label for="FirstName">First Name</label>
<%= Html.TextBox("firstName") %>
<%= Html.ValidationMessage("firstName") %>
</p>
<p>
<label for="LastName">Last Name</label>
<%= Html.TextBox("lastName") %>
<%= Html.ValidationMessage("lastName") %>
</p>
<p>
<label for="email">Email:</label>
<%= Html.TextBox("email") %>
<%= Html.ValidationMessage("email") %>
</p>
<p>
<label for="password">Password:</label>
<%= Html.Password("password") %>
<%= Html.ValidationMessage("password") %>
</p>
<p>
<label for="confirmPassword">Confirm password:</label>
<%= Html.Password("confirmPassword") %>
<%= Html.ValidationMessage("confirmPassword") %>
</p>
<p>
<label for="Role">Role:</label>
<%= Html.DropDownList("Role",((SelectList)ViewData["Roles"]),"--Select One---") %>
</p>
<p>
[Code....]
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Jun 18, 2010
What's the simplest and most effective way to selectively redirect HTTP requests to your ASP.NET page to its HTTPS equivalent? For example, if my page site URL is [URL], I want to redirect some (or all) page requests to [URL] What's the easiest way to do that?
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Sep 17, 2010
i am working in creating forms based wizard application.user interface is something similar of using ASP.Net wizard control. i like to create 5,6 pages with data collection forms (each page with each section) and final confirmation page. can any one tell me better way of building it using MVC. I am not sure how to maintain state across pages ( Model binding?) .
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Mar 2, 2011
I'm wondering what the best practice is in reporting back to the browser about application or model state errors that would be displayed to the user. Can you throw an exception and handle it in the error handler of the jquery post? For example, consider this method:
[HandlerErrorWithAjaxFilter, HttpPost]
public ActionResult RetrievePassword(string email)
{
User user = _userRepository.GetByEmail(email);
if (user == null)
throw new ClientException("The email you entered does not exist in our system. Please enter the email address you used to sign up.");
string randomString = SecurityHelper.GenerateRandomString();
user.Password = SecurityHelper.GetMD5Bytes(randomString);
_userRepository.Save();
EmailHelper.SendPasswordByEmail(randomString);
if (Request.IsAjaxRequest())
return Json(new JsonAuth { Success = true, Message = "Your password was reset successfully. We've emailed you your new password.", ReturnUrl = "/Home/" });
else
return View();
}
Is it correct to throw an exception in this case when the user is null? Or should I instead do this and handle it in the success handler of the jquery post: return Json(new JsonAuth { Success = false, Message = "The email you entered does not exist in our system. Please enter the email address you used to sign up.", ReturnUrl = "/Home/" });
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Jan 26, 2010
For error messages, validation faults etc you have
ModelState.AddErrorMessage("Fool!");
But, where do you put success responses like "You successfully transfered alot of money to your ex." + "Your balance is now zero". I still want to set it at the controller level and preferably in key-value way, the same way as errormessages but without invalidating the modelstate.
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Jul 30, 2010
I have just gotten a very odd error and I can't explain, or trace it out. My forum entity maintains a list of child forums. The list is internal, and exposed as an ienumerable, along with some methods like AddChild, FindChild and RemoveChild. Now to the code:
[Code]....
I have stepped through this several times, testing values along the way. It works perfectly, so I cannot explain the error. If a parent forum id is given, forumRepository.Update(parent) runs with no errors, it just doesn't actually save the new child to the db.
Incidentally... until I restart VS2010, the nhibernate session actually THINKS it HAS worked, and the new record shows on the page.
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Apr 4, 2011
Alright, so here's my basic ASP.NET page setup: I've got a page with a GridView that has ContentTemplates in it. You can add a row and edit/remove rows at any time. There's a "New" button that creates a new row.
All of this data is bound to custom data objects. So if I have a GridView of "People" and each row has "FirstName", "LastName", and "Gender" (with TextBox and DropDown controls), I then have a "Person" object which has public properties for "FirstName", "LastName", etc. I have the binding set up correctly, and I can push data into the GridView from the object, and I persist the object with the Session variable. My page lifetime structure looks something like this:
Page_Load: Loads the List(Of Person) from Session()
Any events fire, and modify the List(Of Person).After any event, the List(Of Person) gets saved back into Session(), and is then DataBound to the GridView (and any subsequent fields are also DataBound, such as the DropDownList.
My question is: Whenever I fill in rows in the GridView, and then add a new row (there is no database saving going on whatsoever), my fields clear out and don't persist across PostBacks. So, how can I persist my custom data objects with databinding across postbacks?
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Sep 30, 2010
I have a datagrid that loads on page_load.
In this instance I can't load the datagrid in page_init as the results of the datagrid are determined by a checkbox and the checkbox would always be set to true during page_init to the viewstate not being loaded.
I have an OnItemDataBound event on the datagrid that dynamically creates controls and later on I want to access the value of some of these controls (e.g. a text box)
Of course the problem is I can't access these controls values as they don't persist over a postback.
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Jun 22, 2010
I am new to ASP.NET MVC and I am using ASP.NET MVC 2. I am trying to implement the following feature and I need your expertise on this:
Authentication is Windows Authentication. Every user has at least one country associated to his/her account that he needs to manage.When a user navigates to the site we have to look up his/her associated country and persist it somehow (session?).With every call to the backend we need to pass the country as a filter. When a user has more than one country associated to his/her account, we need to display a dropdownlist on the site and the user should be able to change the "current" country at any time.
I have a couple of questions:
Where exactly in the lifecycle in the ASP.NET MVC framework should I retrieve the country or countries for the currently logged on user and where should this be persisted? In ASP.NET I would solve this by creating an intercepting filter using a HttpModule to set the Countries in the session state. What is a good way to implement this in ASP.NET MVC 2? (strongly typed session state wrapper?, magic strings?)Should I put a dropdownlist for the selection of the countries in my masterpage? How can I make sure that the current country remains selected in this dropdown?How can I make sure that with every call to the backend the country is passed, should I use an action filter?
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