MVC :: RadioButtons Loses Selection On Postback?

Oct 26, 2010

If I have a list of radiobuttons like this:


, when submitting the form and return the untyped View again, the selection is lost. What is the best practise to overcome this in MVC?

My submit-action looks like this as I am also passing an uploaded file...


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Web Forms :: Dynamic Controls Auto Postback (asp:radioButtons)?

Jan 11, 2011

I'm inserting controls dynamicaly on my page on pre-init, thease controls are inserting based on a dropDownList that load its values from a database. These values are diferent to all clients.

If I insert my controls on pre-init then I have access to the value of radiobuttons, but this insert only 1 controls cause in pre render I don't have the selected value of dropDown.

If I insert my controls on on-load event then I have the value of my dropDownList control so I can be able to inser the correct number o controls but I don't have the value of my auto-postback radioButtons.

I make a project to solve this and I share the code of it here. (VB.Net 4.0)

Front Code:


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C# - Radio Button Loses Value On Postback?

May 3, 2010

I have a set of radio buttons for "yes" and "no" values which have a name="choice". "yes" is checked by default. They're both runat="server". I read the choice on postback like below. It works perfectly fine as long as the validation doesn't fail. For example, if I select "no" and validation fails on postback, I still see "no" selected. But if I submit the form after correcting everything, the value read is "yes" on server side! Is this a bug in .net, and if so, how do i fix this?

foreach (string key in Request.Form.AllKeys)
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Apr 13, 2010

I'm having trouble with a simple radio set of two radio buttons (I don't want to use a RadioButtonList [RBL] because RBL doesn't allow child controls, and in my case, if you select one option, I want to enable a textbox next to the button; yes you could hack this with jQuery to move the textbox, but that's dirty!). I would check one, submit the form (either explicitly or through AutoPostBack), and the CheckedChanged event would never fire. When the page was reloaded, both buttons would be unchecked, regardless of their initial state on non-postback load or the state before form submission.

form id="form1" runat="server" enableviewstate="true">
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Web Forms :: FileUpload Control Loses Value On Postback?

Sep 11, 2010

I'm having a little problem with my file uploading. Does anybody know how to maintain the value in the FileUpload control between server posts?

I have a form which, among other things, uploads a file. I am using an ileUpload control (created dynamically) to let a user browse their PC for a file and then using the SaveAs method to upload the file to the server.When I'm selecting a file and Click on Next button for processing then selected file is lost.

Same is happening with me with HtmlTextArea (dynamically generated) , the problem was that I was not again re-initializing the controls after postback. What I did is re-initialized it in Init method of placeholder (as I have created/placed all dynamic controls in placeholder ).

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in a hidden variable and the FileUpload1.PostedFile.SaveAs(filename) will not work bcz of absense of object (fileupload1).

here is code:


I have done almost the same in different test project , it works . I dont know whats wrong?


How to correct this?

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Oct 18, 2010

There is button(btnOpen) and a textbox (txtResult) in the page.

Once I clicked on btnOpen, a modal dialog will appear, displaying TextBox1 and Button1.

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So I created this test program to illustrate by passing the value into a txtResult.

Can anyone guide me on getting the TextBox1.Text value?

Besides that, is there anyone to tell more about what does this lines of code do?


The aspx code:


the Code Behind .cs :


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I have the following simple code:


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Dec 19, 2012

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I have a custom radiobutton and it renders fine but loses state after postback.

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I have an page with some JQuery tabs. Everything works ok.I added a dropdownlist in one of the tabs, that causes a postback. After the postback I want the same tab to be selected.I initialize the tabs as:

<script type="text/javascript">
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Platform: ASP.Net 2.0 I have multiple checkboxlist controls on a webpage. Along with that i have the same number of buttons on that page. Initially all the checkboxlist controls are hidden. When user clicks on a button, corresponding checkboxlist controls gets visible making others hidden and allows user to select the options.

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C# - Changing Dropdownlist Selection Causes Full Postback?

May 6, 2010

I have a search page with a TextBox that allows someone to type in a search term and press enter. (Which fires TextChanged). I have a DropDownList that specifies the kind of search that will be performed. It is defined in the markup as follows:

<asp:DropDownList ID="lstSearchType" runat="server" AutoPostBack="false">
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Pressing enter fires the OnTextChanged event for the TextBox, which performs a search and updates a GridView in an UpdatePanel. This UpdatePanel has its UpdateMode set to conditional and has one trigger: the TextChanged event of the search TextBox.

It's very simple.

And it works beautifully, almost.

Whenever I change the search type, the very next search does a full postback. All subsequent searches do partial postbacks (as desired) unless I change the search type again.

There is one exception to this rule: if I load the page and immediately change the search type, it doesn't do a full postback. So the first change of the DropDownList before any postback (full or partial) does not trigger a full postback.

Full Disclosure: I'm doing a lot of JavaScript to change the appearance of the gridview during async requests. I don't detail it here because it seems unrelated. This problem only occurs when a DropDownList with no JavaScript wired up is changed.

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Web Forms :: Dropdownlist Selection Changes To First Item On Postback

Oct 19, 2010

I have been having some trouble with dropdown lists reverting back to selecting the initial item in the list after a postback once a selection has been made from the dropdown list. I have read up on this and found out that a "if not ispostback then" is required.This works fine when I add in all the items in the dropdown list manually like:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
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However, I have over 250 items and so it is far more efficient for me to load then in by using part of a multidimensional array which is created from a text file - Definitive database.txt. I have been using the following code to do so:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
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This loads all the items into the dropdown list perfectly, but now every time a selection is made, it reverts back to the inital item on postback even though i have included the "if not ispostback then" part.

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Aug 6, 2013

I have two dropdownlists on my page that are related to one another, and are built dynamically. I did not write the original code, but I believe it is using AJAX so the whole page doesn't postback when the ddl selection changes. The first ddl is Status and the second is ContractType. Here is the code for the event handler:

protected void Status_SelectedIndexChanged(object sender, EventArgs e)
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[Code] ....

Here is some of my debugging info:

? view.Count
? view.Table.Rows.Count
? contractTypeDropDown.SelectedValue

[Code] .....

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Web Forms :: List Box Jumps Back To Top On Selection Of Item (Postback)

May 5, 2010

I have an asp:ListBox which contains a list of countries. Users select one or more countries and then assign them to another list box on the page.

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In Internet Explorer, if I scroll down (say to United States) and then click it, the list scrolls back to the top. United States is still selected, if I press the "Assign" button it will appear within the second list box, and if I scroll down I can see that United States is still selected.

However, users are complaining about this, especially since it happens so quickly that they can't select multiple countries.

I tried using smartnavigation and MaintainScrollPosition, but this has had no effect.

<%@ Page Language="C#" smartNavigation="true" MaintainScrollPositionOnPostback="true" AutoEventWireup="true" EnableEventValidation="false" MasterPageFile="MasterPage.master" CodeFile="form.aspx.cs" Inherits="forms_template" %>

This behaviour is not exhibited in Firefox.

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Oct 3, 2010

i have a dropdown list

<asp:DropDownList ID="DDName" runat="server" AutoPostBack="True"
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the problem that it is not causing post back on the first selection but on the second, I mean if i select from drop down list first selection no post back on the server,but when i select another item from the list (the second click on a different list item )

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AJAX :: Remain File Selection In Fileupload Control After Page PostBack?

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i have searched on google and got an article [URL] keep selected file in fileupload control even after page postback. But it's not working at all. So is there any way through which we can keep selected files in fileupload even after page postback.?

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AJAX :: Textbox Postback Causing Radio Button List To Lose Selection?

May 27, 2010

This is likely a n00b question, but I can't seem to find any info on how to solve it. Here's the scenario:

I have a Textbox and a RadioButtonList in an UpdatePanel, both with AutoPostBack turned on (they need to be, can't turn it off on the text box))

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Because the textbox post back is executing, the radio button is losing the value that the user selected.

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