Dynamically Create Controls And Save The Controls Values Across Postback?
Mar 25, 2011
I allow the end user to create a tab control dynamically in an ASP.Net page by getting some details. For each and every tab added I get some settings -
Tab Title
Tab Content
Tab Footer link
So I get these details for each and every tab. The user is provided with a button 'Add Tab' to more one more tab. So I need to add one more tab settings panel in the page to get the tab settings. But doing so, I lose the values entered in the previously created dynamic tab settings panel. The user can add as many tabs and enter settings for each and every tab. Finally when they save it I build the tab control (based on their settings and content) and I render the control.
Since the controls are dynamic, I'm able to thing of two options -
Recreate previously created n - 1 tab settings panel while adding a nth tab. So across each and every postback I need to recreate the settings panel for each and every tab. But I don't know how to persist the values in this case.
Add the settings panel in the client side with simple html controls and on page UnLoad parse the controls -> Parse the settings -> Save it in a hidden field -> Get it in the server side. In this case I lose all the server side capabilities where I need to write validation scripts for the controls.
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Similar Messages:
Jun 11, 2010
My problem is:
I've got a table, dynamically created, fill with a lot of dropdownlists witches IDs are dynamically created.
When a button is pressed, I need to scan all controls in the table and save their value.
But after the postback I can't no longer access to the table.
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Sep 28, 2010
I'm creating an quiz application which queries the database and extracts the questions and choices. I use dynamically created controls such as a checkbox list and fill the values dynamically. How do I do this? Right now I have these functions:
array_random_init(); this creates a 10 element integer array from 1-20 - extract_question(i): this extracts a question indexed at i in DB, I created the controls and set the appropriate text in this function. - validate_question(i); this is called by button_click and validates the question i according to DB.
I understand I have to recreate the controls in Page_init on postback, but what should it look like? Do I need to add "if IsPostBack" in page_init, or do I create the controls in page_init() and reset their properties in page_load when I use extract_question(i)? Also, I cannot seem to clear the selected boxes on postback, I added page directive "enableviewstate=false" but it doesn't work.
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Feb 12, 2011
i want to create rdlc file dynamically having textbox in it and how to save it?
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Feb 1, 2011
I am using VS 2005.I have 5 tables depending on their values ,I need to draw a bar chart.
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Apr 30, 2010
I have a form with 2 sections. The first one contains some radio buttons. The second one contains a checkboxlist. When we change the selected radio button then it modifies the elements in the checkboxlist. For this I setted the radio buttons with autopostback, and in the code behind (in OnLoad) I populate the CheckBoxList depending on the selected radio button.
This work fine.
The problem is that I also have a button at the end of my form which post the data of my form in another page (with PostBackUrl). Then in that page I would like to retrieve the values of the checked checkbox. But I can't find how to do that. In the Request.Form I don't see anything.
I searched on the web but I didn't found really a solution.
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Mar 2, 2010
First, I would like to apologize, the search on the site wasn't working, so I don't know if I'm missing an existing post or not.
I have a web page that uses a master page file. I am using a third party control from Component One(TabStrip), the tabs are rendered as links on the final page. When a tab(link) is clicked, I need to load the appropriate web user control associated with that tab. Each web user control has its own post backs and methods. I know that I can load the controls on the "SelectionChanged" event of the TabStrip control, but then any postback created by the web user control that is loaded causes the page to refresh and the control was never loaded in viewstate. So, I tried to put my procedure of loading the web user control into the page_init method. This would work, if I could read which link was clicked on from within the page_init method. I tried using a javascript function to run "onclick" of the tabs and within it setting the value of a hidden control. I have verified that the javascript works and that the hidden control's value is getting set correctly. When I get into the page_init method, the value of the hidden control is not readable.
I'm tying to understand the page lifecycle to the fullest, but I don't see what I'm missing here. I know that I need to load the web user controls in the page_init method in order to persist the page as a whole, but how can I get which tab(link) was clicked to know which control should be loaded?
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Sep 20, 2015
I am using link button in updatepanel and click on asp:linkbutton it refereshes all page. to stop _dopostback on link button click.or any alternative to use linkbutton.
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Oct 4, 2010
I am using asp.net/c# application. In my application, I have a gridview.<asp:GridView id ="gv_QuestionList" runat="server"> </asp:GridView>In Code Behind, I created dynamic textboxes and DropDownLists on RowDataBound.
[Code]....
I have a Save button out side the gridview which stores all the row values into database. when I click the "Save" button, I lost dyanamically ceated controls like textbox,dropdown and values (on postback).How can i get all the dynamically created controls and values after the post back?
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Mar 31, 2010
So I have a gridview control and I am binding it's datasource dynamically base on a dropdownlist. The gridview contains autogenerated columns with auto generated edit buttons. The datasource binded to the gridview is IQueryable<T> where T will be different for different datasource.
My detail problem is below:
A GridView binded to datasource dynamically with all autogenerated columns. When user click edit link, it will display value in autogenerated textboxes.
When user click update link, I am able to capture the user entered value in the textboxes in RowUpdating event, then pass those values to Linq update function to update the database. Now, the problem begin when I try to dynamically add validation controls to each editing row. In RowDataBound event, I am checking the editrowindex then adding validation control to gridview cell and pointing to cell.controls[0] which is the textbox control when the row is in edit mode, I am dynamically setting the textbox control id so that the validation control can set controltovalidate property. The validation control works, but the updating function is setting everything on the grid to empty string.
I am check the textbox text value in the loop, which returns "" for all cells except the id column. It was returning the correct value before I add the validation control. I guess since I added the validation control on rowdatabound event, will it rerender it's own autogenerated textbox in edit mode so that the text value of textbox no longer available in rowupdating event?
Is there a better or correct way to get the cell textbox value? I am using ((TextBox)dc.Controls[0]).Text where dc is DataControlFieldCell in rowupdating event.
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Mar 14, 2010
i want to create a few textbox dynamically in place holder but when i created and click on btn and use findcontrol to retrive input data that created dynamically storing data in db , i will receive an error like this :
Object reference not set to an instance of an object
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Jan 15, 2011
I'm building an ASP.NET UserControl where users of the website can upload several pictures at once. I'm doing it the old fashioned way by letting the user enter the amount of FileUpload controls wanted and then add them dynamically from C# to a asp:Panel control.
While this works, the values/files from the FileUpload isn't stored for when the user clicks the "Save" button. How exactly do I go about this problem?
My code for specifying the amount of FileUpload controls wanted:
[code]....
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Nov 18, 2010
I know this question has been asked thousands of times, and I've struggled with it before, but for some reason, I can't accomplish what I want to accomplish... I have a dynamically added LinkButton that when clicked will dynamically add a control (in this example, a textbox) to the same panel. The intent is to continuously add on as many controls as times the LinkButton was clicked (i.e. I click it once, one box, then another click will give me 2 boxes, another click adds a 3rd). In the code below, I use the current date and time serialized to create a unique ID for each textbox control.
When I execute the code, clicking "Add Filter" will generate a new textbox, but once clicked again will create a new one, and dispose of the one before it. Instead, I want to persist the previous textbox as well as any data submitted within it.In the aspx:
<asp:Panel ID="pnlFilter" runat="server">
</asp:Panel>
In the aspx.cs:
protected void Page_Init(object sender, EventArgs e)
{
LinkButton lb = new LinkButton(); [code]....
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May 7, 2015
i can add the dynamic textbox in dynamically created html but can not get the value of dynamically added textbox.
there is code what i do
protected void txtNoOfTypes_TextChanged(object sender, EventArgs e)
{
int n = Convert.ToInt32(txtNoOfTypes.Text)+1;
for (int i = 0; i < n; i++)
{
Label MyLabel = new Label();
MyLabel.Text = "Type" + " " + ViewState["num"] + i + " " + ":" + " ";
[CODE]...
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Nov 1, 2010
For every row in my 'table' I am manually creating, there must be a LinkButton to delete a database row that matches a column in the table. Because no 2 controls can have the same name, I've had to use a GUID to name them so they're all unique.
Problem is, right now when I click Delete, the page posts back with no changes, but I've been told that I need to recreate the controls - but how do I recreate them in Page_Load when their ID's are randomly generated? Here's my code:
[Code]....
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Jan 23, 2010
I have 2 sections of my website I am developing, a reference box that has a fixed width and a working box that has the same height as the content. I am trying to make it so the user can swap the content between the two boxes. I have the following type of setup in the aspx page:
<asp:panel id="pnlReference" runat="server" CssClass="referencePanel" >
<asp:panel id="pnlsection1" runat="server" >
Content....[code]....
What I am trying to have occur is when I press the lbtSwapPanels linkbutton, it moves pnlSection1 into pnlWorking and pnlSection2 into pnlReference. The code I used to do this in the OnClick method was:
Control pane1, pane2;
pane1 = pnlWorking.Controls[0];
pane2 = pnlReference.Controls[0];[code].....
Unfortunately, this does not work. When I click the linkbutton, nothing happens. If I then do something to perform another postback the reference and working panels become empty. I assume this has to do with the change not being saved into Viewstate but I don't know how to get around that. how to do this?
well as making my asp.net ajax tabcontainer completely fail to function. After 2 swaps and postbacks, further postbacks cease to function at all. Here's the new code
<div id="referencePane">
<asp:panel id="pnlsection1" runat="server" >
Content with tab container[code]....
First postback causes the tabcontainer to fail (javascript exceptions claiming it's trying to create a tab container with teh same ID (only one exists in the original aspx page). Postbacks then proceed to do wierd stuff.
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May 29, 2010
I have a form with several DropDownlists and TextBoxes, Each dropdownlist depends on the selection of the previouse one.. and there is a submit button. Once the user clicks on it, information entered by the user is displayed in a GridView and saved as well in the database. The GridView holdes information from two tables I used joining) , but once I click on the Submit button I receive this error: Arithmetic overflow error converting varchar to data type numeric. The statement has been terminated. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Data.SqlClient.SqlException: Arithmetic overflow error converting varchar to data type numeric. The statement has been terminated. Source Error:
[Code]....
Imports System.Data.SqlClient
Imports System.Web.Configuration
Partial
Class Members_MembersCalculator
Inherits System.Web.UI.Page
Protected Sub CalculateButton_Click(ByVal sender
As Object,
ByVal e As System.EventArgs)
Handles CalculateButton.Click
Dim objConnection As SqlConnection
Dim objDataCommand As SqlCommand
Dim c_manu, c_model, c_date
As String
Dim sSQL As
String
Dim ConnectionString As
String
Dim c_factor As
Double
Dim c_result
As Double
Dim c_milage As
Double
Dim c_id As
Integer
Dim c_year As
Integer
c_manu = ManDropDownList.Text
c_year = YearDropDownList.Text
c_model = ModelDropDownList.Text
c_milage = MilageTextBox.Text
c_factor = FactorDropDownList.Text
c_id = CarIDDropDownList.Text
c_date = CarDateTextBox.Text
c_result = c_factor * c_milage
ConnectionString = WebConfigurationManager.ConnectionStrings("Carbon_free_ConnectionString").ConnectionString
objConnection = New SqlConnection(ConnectionString)
objConnection.Open()
sSQL = "Insert into car (Manufacture, year, Model, car_factor)" & _
"values('" & c_manu &
" ', ' " & c_year & " ',' " & c_model &
" ', ' " & c_factor &
" ')"
objDataCommand = New SqlCommand(sSQL, objConnection)
objDataCommand.ExecuteNonQuery()
objConnection.Close()
objConnection = New SqlConnection(ConnectionString)
objConnection.Open()
sSQL = "Insert into car_Result (car_id, car_Result_Date, Car_result)" & _
"values('" & c_id &
" ', ' " & c_date & " ',' " & c_result &
" ')"
objDataCommand = New SqlCommand(sSQL, objConnection)
objDataCommand.ExecuteNonQuery()
objConnection.Close()
msgLabel.Text = "Your records have been calculated successfuly, Thank you."
'CarDateTextBox.Text = ""
'MilageTextBox.Text = ""
CarGridSqlDataSource.DataBind()
CarGridView.DataBind()
End Sub
End
Class
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Mar 15, 2010
I have a self-made webuser control named UCLabeltextBox with 1 label and 1 textbox. When pressing the save button the page is refreshed and the value of the textbox is erased. Anyone a solution to this? Here's my code:
[Code]....
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May 7, 2015
I want to add the text box values to grid one by one and next i want to submit all grid values for insert.
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Jan 20, 2010
I have a dinamically gridview, populated according with the SQL sintaxe from the user, with a TextBox. I enable in the gridview an Edit button, and the rowEdit works well when fired. But my problem is Update button. How to save the record edited, in a dinamically gridview, when I can't programatically set the fields to be saved? Ie, I need to iterating with all fields in the gridview edited record and update. How to do this?
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May 7, 2015
I am generating barcode image dynamically on button click .
The image is display on the asp image control, now I want to save that image in database
string barCode = txt_ID.Text;
using (Bitmap bitMap = new Bitmap(barCode.Length * 40, 80)) {
using (Graphics graphics = Graphics.FromImage(bitMap)) {
Font oFont = new Font("IDAutomationHC39M", 16);
PointF point = new PointF(2f, 2f);
[Code] .....
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Jun 21, 2010
I would like to find out if there is anyone who would know how to read from a database then returns the same number of records that a stored procedure returns and display those records on the webpage there after pass the ID of the record to a variable to another stored procedure that displays the data related to the record that was clicked, I tried doing this in a asp.net repeater but I can't seem to be able to reference the controls inside the repeater.
<Repeater HTML Code>
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="OpenLogs.aspx.cs" Inherits="OpenLogs" EnableEventValidation="false" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
[Code]....
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Jun 3, 2010
I'm passing a List to an MVC view and generating checkboxes for each object in the list (The checkboxes are named t.Name).I'd like to be able to tell which checkboxes were checked once the form is posted. However, I'd like to avoid using the FormCollection object.
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Mar 24, 2011
I need to create dynamic radio buttons in my page, and then access their values in postback
I create the buttons using the following code:
[Code]....
In the post back I try to access the radio buttons using their created ID:
[Code]....
But it seems that the find method is never finding the Radio button control.
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Feb 18, 2010
I have an editable gridview with blank cells. User enters some numeric data in cells and also user can clicks a button to add new row to gridview. My problem is that, as soon as button click event is fired, the page refreshes & the gridview becomes empty. Can anybody tell me, how can I save values in gridview until the user saves all changes to the server in the end
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