Web Forms :: Viewstate Dynamic Controls In Wizard?
Sep 14, 2010
I have a question about retrieving the values from dynamic created controls. I'am using an wizard witch collects it data based on the steps in the wizard. At a certain wizard step i generate dropdownlists and textboxes depending on some records from a database. At this point no problem, the controls are created perfect. When i press the next button on the wizard i read out the eventarg e.currentstepindex, iterate throug the gridview witch is displaying the controls and try to find the control with "findcontrol" function.
The controls are "nothing" and i cant access them. THe source code of the page lets me show that the controls are there and that they have the assigned ID's.I investigated on google what the problem could be. I has to do with the viewstate and i have to regenerate the controls on page_load.
I generate dynamically an usercontrol, the user write the quantity, 3 or 4 or 5, press generate and get N controls to fill with cars parts.I need get the values inside any textboxes but the method find never found the controls...I am using this code to generate dynamically my controls:
[Code]....
when the controls is loaded into the WizardStep, I need to find it to get the values inserted by the user in the textboxes.
[Code]....
but I never find the control always is null, I place it inside a Panel called UnidadesPanel.
I have an ASP Wizard control. On my first step I have two listboxes, The first listbox item is populated from the server, when the page loads.User then selects data from ListBox One and Moves it to ListBox2. Then clicks on the NEXT button of the wizzard. Somehow when the user clicks on next the ListBox2 is empty.I use jquery to move data from ListBOx1 to ListBox2.
I have created a button(x) dynamically,and in that button click event I am creating a textbox and one more button(y) with that button(x) is making as invisible. if I click button(y) I want to read the value of textbox(textbox.text) and make button(x) as visible.
I am creating a gridview dynamically in a custom control and adding it to a Panel. I set the EnableViewState = true. The problem is that on a page postback the GridView does not seem to retain its values. If I add a GridView through the UI then the viewstate is preserved. The problem seems to occur when it is put dynamically only.
My datasource is an ado data table that I have convert to a new data table so that each row in the original table is now a column with 1 row in my new table. I then bind the new datatable and create dynamic template fields with a text box where I bind the values. My problem is, when I try and retrieve the values changed by the user in the rowcommand event, the template columns no longer exists.
Does anyone know how i can retrieve these values? I've read over and over that you have to rebind the grid on each postback when you use dynamic templates, but I'm not sure how to do that and retrieve the values entered in the text boxes on the client side.
What this does is create a javascript spinner control. Now when I click the NEXT button onto this step it generates the spinner control. I click next to go to the next step, then I click PREVIOUS to go back to this step and the spinner control is not generated.
Now I have tested this on an ASPX page and it seems to work, I then copy the code across to an ASCX control and put the page live and it does not work.
The update panel has an animation extender that just displays a div with a processing gif when you click next/previous.
So any reason why it creates the control on the next and not the previous step?
I have a dynamically created wizard control in the Page Init subroutine and accompanying NextButtonClicked event attached. It seems that when clicking the next button in the wizard and firing the event which is supposed to in turn insert a row in the db via an objectdatasource outside of the wizard, the insert is executed as many time as there are wizardsteps. For example, if there are 5 wizardsteps, then when looking at the data in the database there are 5 rows for what would be each insert from each wizardstep - and if there were 4 then 4 rows would be insterted for each step and so on...Is this something to do with adding the even dynamically and using the objectdatasource to insert??? I can't put my finger on the repetition....Basically....I create a wizard control dynamically which is much a like a quiz (each wizard step would be a question) - the number of wizard steps is contingent on a value retrieved from the database. The user enters data on each step which is inserted via the Objectdatasource when the NextButtonClick event is fired.
Duplicate rows are inserted in the database for the value of the wizardstep just completed. The number of identical rows are equal to the number of the wizard steps created for the control. This happens for each wizard setp in the control except for the finalbuttonclick event. All the controls in the step have a unique ID.If anyone has either a solution, or a way to possibly spot check this to determine if it is a bug or not,
My page has a drop down whose values are dynamically populated. Based on which item is selected, a number of TextBoxes are dynamically created during runtime.The user then fills in information into the textboxes and clicks a submit button.
Problem:
After postback from the submit button, I need to again dynamically create the TextBoxes during Page_Init (BEFORE LoadViewState) so that after the ViewState loads, my Button_Click event can save/do whatever with the user input. PROBLEM is, I cannot recreate the textboxes based on the selection in the dropdown, because the dropdown hasn't been "selected" yet by LoadViewState.
SO, how can I read from the view state, create my textboxes, then let the viewstate populate the textboxes, and then the Button_Click will use the values??
The one thing I've attempted is to override the LoadViewState function so that I can read from the view state, create the boxes, and then load the viewstate again. This did NOT work, because the debugger never seemed to hit my overridden function.
I have a set of dynamically-created (IE: by code) controls on my web page. Depending on which options the user decides to go (Edit/New), those controls are re-created with the appropriate information (IE: "with values" with Edit, "without values" with New).
Here's the situation:
- I create my controls in InitComplete when it comes to save the data (both on Edit/New) contained within the controls.
- I create my controls in PreLoad when it comes to load them initially (Both on Edit/New) in order to avoid the ViewState to kick in.
However, despite creating the controls after the ViewState has been applied (technically), the controls still somehow retain the pre-postback's information. IE: if I have options 2 and 4 selected and I choose "New", which should show the options without being selected, they remain selected no matter what. And this is true despite changing their values in the PreLoad state. From my understanding, creating a control in this fashion and at that point in the page lifecycle should override any values the ViewState might have had for those controls. I have also tried to disable the parent's control viewstate (Table.EnableViewState = false) again, to no avail.
I've tried using the Me.ViewState.clear() and Me.ClearChildViewSate prior to loading the initial values as well, but again all for naught. I do understand that any control created after the Init phase of the lifecycle has to play "catchup" with the current state, however I would expect that clearing the ViewState prior to creating the controls would fix this issue. It doesn't seem to.
My asp.net application has a function that returns the HTML for the navigation menu for the user by getting it from a database
currently, I am storing the text in a session variable when the session begins and then use it to set the innerHtml of the navigation div on the on_load method.
I have an asp.net web form, and on it I have two controls (well, more than these two but we'll focus on these) - the first is an asp:dropdownlist and the second is an asp:table.
Both of these controls are declared on the HTML side, and filled (child controls added) in the code-behind page.
My simple question (hopefully with a simple answer) is this:
Why does the viewstate persist for the dropdownlist, and NOT for the table?
I have to fill the table on every page load, but I can fill the dropdownlist once (using Not Page.IsPostBack), and it persists.
NOTE: I have read about the lifecycle of ASP.NET pages, and I have tried placing these same calls in the Init() and PreInit() page events with the same results.
I am trying to use wizard in an update panel but the wizard is disappearing when I click for the next or prev step button. I only want to close wizard , when I click the finish button. How can I do this ?
In my ASP.NET page I have to dynamically choose and load a custom control, depending on the selected value in a dropdownlist.However I encountered the following problem: When the parameters of the dynamically loaded control are changed, and then the selection in the dropdownlist is changed( thus forcing me to load a different dynamic control the next time the page reloads ), I end up with a "Cannot load ViewState" exception.I assume that this happens because the ViewState is trying to restore the parameters of the old control and it doesn't find it. So , is there any way to stop the viewstate from attempting to restore the state of the non-existig control?
I have a dynamic Table which contain 8 rows and 8 Colums
Table t = new Table(); TableRow rr = new TableRow(); TableCell cc = new TableCell(); and in the each Cell CC I add a dynamic Button(Or Linkbtn) LinkButton LB1 = new LinkButton(); LB1.Text = "AM"; LB1.ID ="Link1"; cc.Controls.Add(LB1); rr.Cells.Add(cc); LB1.Click += new EventHandler(LB1_Click); t.Rows.Add(rr);
i have a table with 8 rows , 8 colums and each cell contain a LinkButton (which diffrent in IDs) I want to add Lable in the same cell of this LinkBtn(LB1) which it clicked but I cann't What shoud I write here?
Lets say I have a Web Application with a menu of products. When a user clicks a menu item, then create and display a dynamic set of controls in an Update Panel. I am currently doing this however the PostBack and recreation of controls is tedious and resource intensive.
Not sure about this but is it possible to build a webpage with controls on it, then display it in update panel or IFrame? Then on post back you wouldn't have to recreate everything all over again?
Now here is the weird thing. First i am running it locally on the built in vs2008 web server.I load my control in fine, do a postback from a linkbutton, locally on my machine it all works fine, no issue.However when it goes onto my host, it falls over with the message:
Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request.Now i also load controls dynamically and use postbacks and things in the admin area of the site...and that works fine, however my front end just keeps failing? See the code behing below:
Is there a way to access the updated text property of a TextBox which is inside a GridView cell when a Wizard controls next or previous buttons are clicked? I have a requirement to not use the edit and/or update buttons on the GridView row. Therefore, I am trying to figure out a way of grabbing the updated values of each TextBox of the GridView on the PostBack. Furthermore, these controls (i.e. Wizard and GridView) are within an AJAX UserControl.
I have been getting this error a lot lately with some of my users, and I had a couple of concerns with view state and I have read so many articles but I am still lost..
1. I use masterpage on all the pages and I need viewstate for some of the pages but..
There is a page where a user will fill out the information and then submit this data to a cgi server, and it is where I get most of the Client Disconnected errors, what would happen if I disable viewstate when they click on that button?
Now when a user browses from one page to another, does the view state from the previous page get deleted? If not how would I delete it?
Does the master page have its own viewstate? Would I be able to make sure none of items on my master page are using the viewstate?
I have a shopping cart page (Cart.aspx) that has a button that will (sometimes) post to a third party payment gateway, if payment is necessary. The payment gateway will process the payment and then do a silent post to my website (Order.aspx) so I can update the order status.
Order.aspx always throws an invalid viewstate error, even though viewstate is disabled on the page.
What's happening is that Cart.aspx (which has viewstate enabled) posts to the payment gateway, and the gateway will post it back as part of the silent post. Even though Order.aspx has viewstate disabled and validation disabled, it still tries to validate the __viewstate field it's being given.
I know setting EnableViewState=false will disable the rendering of the __viewstate field, but if another page provides the field, shouldn't it still skip validation? I tried calling ViewState.Clear() on the Page_Init event of Order.aspx, but ViewState is apparently empty. how to get around this? I don't want to disable ViewState on Cart.aspx (in some cases it may be necessary), but I can't figure out how to clear it on Order.aspx.
Stuck trying to populate a dropdownlist with an ObjectDataSource using the wizard.
using the wizard i can successfully configure the datasource, then I can choose the datasource. The next step you should be able to select your display value and the selected value. However, these boxes are not populated within the wizard. I added a gridview to test the datasource and it displays fine.
