.NET Tutorials, Forums, Interview Questions And Answers
Welcome :Guest
Sign In
Register
 
Win Surprise Gifts!!!
Congratulations!!!


Top 5 Contributors of the Month
david stephan
Post New Web Links

Retrieve Dynamically Created Controls

Posted By:      Posted Date: September 14, 2010    Points: 0   Category :ASP.Net
 
I am building a webform dynamically but when I go to get the values the placeholder has no controls.  Every control added has an unique ID.  Does anyone know what I am doing wrong (language is C#).      aspx page <asp:UpdatePanel ID="upShoppingCart" runat="server" UpdateMode="Conditional" >                    <ContentTemplate>                        <asp:PlaceHolder ID="phShoppingCart" runat="server" />                        <br /><asp:Button ID="btnUpdateCart" runat="server" Text="Update" OnClick="btnUpdateCart_OnClick" />                    </ContentTemplate>                </asp:UpdatePanel>   .cs page         private void CreateShoppingCart()     &nb


View Complete Post


More Related Resource Links

Adding carriage returns between 2 dynamically created controls in an HtmlTableCell

  

The title pretty much explains it. Here is what i'm trying to do...

 Private Sub LoadGrid_CommentsField(ByVal Row As HtmlTableRow, ByVal BookingNumber As String, ByVal CommentsText As String)
  Dim Txt As TextBox
  Dim Cmd As ClickOnceButton.ClickOnceButton

  Txt = New TextBox
  Txt.ID = "txtComment_" & BookingNumber
  Txt.CssClass = "TFAppControls"
  Txt.TextMode = TextBoxMode.MultiLine
  Txt.MaxLength = 500
  Txt.Width = New Unit(95, UnitType.Percentage)
  Txt.Text = CommentsText
  Row.Cells(cComments).Controls.Add(Txt)

  Row.Cells(cComments).InnerHtml &= "<br/>"

  Cmd = New ClickOnceButton.ClickOnceButton
  Cmd.DisableAfterClick = True
  Cmd.Text = "Save Comments"
  Cmd.ID = "cmdSaveComments_" & BookingNumber
  Cmd.CssClass = "TFAppButtons"
  Cmd.EnableViewState = False
  Row.Cells(cComments).Controls.Add(Cmd)
 End Sub

On the line where i try and update the InnerHtml, i get the following error; "Cannot get inner content of  because the contents are not literal."


how to apply validation controls on Gridview which is created dynamically

  
 hi, i created a gridview with two columns and 8 rows dynamically. All the rows are empty and editable at runtime. I am giving column names for this grid from some other .aspx page by passing column names using querystring.Because i am using this grid for three different pairs of column names.  i would like to know how to apply Required Field Validator, Regular Expression Validator  and Range Validator on Gridview textboxes. So that by using those validators i want to validate user inputs. And i would also like to know how to add rows at runtime for this grid. I am using ASP.net 2.0 and C#.net for this.(Visual Studio 2005) The code i am using to create gridview is below. <%@ Page Language="C#" AutoEventWireup="true" CodeFile="LoadData.aspx.cs" Inherits="LoadData" %>  <form id="form1" runat="server">  <div> <asp:GridView ID="GrdDynamic" runat="server" AutoGenerateColumns="False" ForeColor="#333333" BorderColor="GradientInactiveCaption" BorderStyle="Solid" style="z-index: 108; left: 24px; position: absolute; top: 13px">  <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />  <RowStyle BackColor="#EFF3FB"

Cannot retrieve values of dynamically generated controls

  
Hi All, I am creating a user control which contains checkboxes and labels that needs to be created on fly. The dynamic generation of these controls depend on the values retreived from a SPlist. I have several panels that display items queried from the list on the basis of a selection criteria. On a button click event I need to capture all the selected values from the controls that were generated dynamically.  When I traverse each dynamic control that I added to the panel, I dont see their values. I tried using recursive retrieval of the control from the page as well but it just behaves crazy, it treats a radio button as a checkbox and returns a value that I am not looking for. I am not using the the page_load() or any other event, I use the button handler on my custom method. I was thinking for ViewState, ControlsState or SessionState. I assume ViewState may not work on this as the dynamically generated controls need to be in the page_load event. Please guide as this getting way more complicated than what I had ever thought of it to be.

Dynamically created controls not accessible after post back.

  
Dear Friends, pls give the solution. code given below.. dynamically HtmlInputCheckBox created and add in PlaceHolder(panel). I can't get the created control values after post back..Dynamic Control Creationprivate void GetPhotos() { HtmlImage img; HtmlInputCheckBox ic; panel.Controls.Clear(); DataTable dtPhotos = DLayer.Qry_WithDataTable("ADM_GET_HotelPhotos"); foreach(DataRow drPhotos in dtPhotos.Rows) { if ( File.Exists(Server.MapPath("../Photos/Hotel/" + drPhotos["FileName"].ToString()))) { ic = new HtmlInputCheckBox(); ic.Value = drPhotos[0].ToString(); if (drPhotos["PStatus"].ToString() == "1") ic.Checked = true; else ic.Checked = false; panel.Controls.Add(ic); img = new HtmlImage(); img.Src = "~/Photos/Hotel/" + drPhotos["FileName"].ToString(); img.Alt = drPhotos[1].ToString(); img.Attributes.Add("title", drPhotos["PhotoCaption"].ToString()); panel.Controls.Add(img); } } }Get checkbox values foreach (Control ctbl in panel.Controls)        {            if (ctbl is HtmlI

Resize dynamically created controls on Canvas

  

Hello,

This is my first thread on this forum and i'm a beginner on WPF.

After google-ing for long time, it seems I can't find a solution for my problem.

I'm working on WPF form. The form contains a canvas and I create Labels on the Canvas dynamically at run-time.

First I had a problem to move the control on the canvas, but eventually I solved this problem by using a class implemented by Josh smith from

his article on codeproject.com. Now, I can move my lables freely on the Canvas.

But now, I want to resize the labels width or height that are created at run-time.

I changed the cursor of the mouse to (horizontal scroll or Vertical scroll) when it touched when of the edges of the label.

but I can't find how to implement the resizing when the mouse goes down or pressed to stretch the label.

Many tutorials found on the web talks about resizing controls the are previously declared in xaml and I want to implement it at code-behind.

Can please help me.

Thanks for help in advance.


Strange validation behaviour on dynamically created controls

  

I'm trying to debug an application which generates a fixed number of questions from a database of 20 questions, and validate them on button click. On postback, I want the incorrect questions to be labeled red. However, all the questions are labeled red on postback. I'm almost positive that the problem is with "page_init" and "page_load",  I'm using session variables to keep track of the question IDs and invalid questions. Any help is appreciated.

Here is the sample code.

Protected Sub Page_Init(ByVal s As Object, ByVal e As EventArgs)
       dim i as integer
       if Not Page.IsPostBack then
           // generates a random integer array for loading the questions
       For i = 0 To 1  // I'm only loading two questions 
           extract_question(selected_array(i))   
        Next
        else     
              //extract_question queries the database and load the controls dynamically
               extract_question(CInt(session("check_0")))  
               extract_question(CInt(session("check_1")))           
         end if      
       end if 
    
    End Sub

Protected Sub Page_Load(ByVal s As Object, ByVal e As EventArgs)
        If page.IsPostBack then
         dim textlabel as string
            dim sessionvar as string
            dim sessionc

jquery how to loop through dynamically created controls

  

I'm trying to use the following loop to loop through dynamically created controls on my web form:

                for(x = 0; x <= count; x++) {
                    Stmt += $("#DDLColumns" + x).val();
                    switch($("#DDLConditional" + x).val()) {
                        case "is equal": Stmt += " = ";
                            break;
                        case "begins with": Stmt += " LIKE '%";
                            break;
                        };
                    Stmt += $(&q

How do I determine the size of a dynamically created set of controls?

  

Hello,

How do I determine the size of a dynamically created set of controls?

For example, suppose I have a method that creates a form made up of many TextBlocks, TextBoxes, etc., all contained within a grid and that grid is returned by the method.  I need to determine the size of that grid without adding it to any other controls.

    Grid myForm = myMethodThatReturnsAGrid();

    // Here is where I want to find out the size (height and width) of the grid myForm.

The reason I need the size, mainly the height is to determine if it will fit in what is left of the page of a FixedDocument for a report, and if not, to move it to the next page.

Regards,

Robert

 


Regards, Robert -- Note: I work on various aspects of one or more programs, working on what is most important at the time. Some questions I ask are on aspects of the program that are not important right now or I'm using a workaround for now. Eventually they'll be high priority again and I'll get back to those answers received and respond accordingly. Those that are high priority get responses very soon. Thanks for your input, it is appreciated.

Dynamically Create Controls in ASP.NET by Using Visual C# .NET

  
This article demonstrates how to dynamically create a control for an .aspx page. The sample project does the following:
Creates two TextBox controls.
Verifies that the contents (TextBox.text) and the attributes of the TextBox are saved across posts to the server.
Illustrates handling events that are posted by a dynamically-created control

Dynamically Create Controls in ASP.NET with Visual Basic .NET

  
This step-by-step article describes how to dynamically create controls for an ASPX Web page.

The sample project does the following:
It creates two TextBox controls.
It verifies that the TextBox contents (TextBox.text) and attributes are saved across posts to the server.
It describes how events that are posted by a dynamically created control are handled.

How to dynamically create user controls ?

  

HI,

can you explain how to create user control dynamically in a web form ?When i am creating server controls of user controls are not instantiated and it is not getting initialized .when i am tyying to initialize its properties error occurs tha object instance not created .

Any suggestion ? 


Issues with dynamically created TabContainer (Hide/Show TabPanel)

  

I have a web page that contains an UpdatePanel. In that panel, there is a TabContainer control that has 5 TabPanels, only the first one "Tab 1" will be displayed during initial page load. There is an Add button in "Tab 1", whenever it gets clicked, I will add (show) the next TabPanel (Tab 2, Tab 3, etc., all the way to Tab 5). "Tab 2" thru "Tab 5" contains a Close button that will close (hide) the current tab when clicked.

I'm doing all of these from code behind (dynamically create controls in Page_Init event and re-generate them during postback, track each TabPanel's content in a session variable, etc.), and everything seems to work just fine IF after adding several TabPanels, I remove  them in order (i.e. remove Tab 5 first, then Tab 4, Tab 3, etc.). It will NOT work whenever I try to remove a tab in the middle, then I will get all kinds of strange results.

I've attached the sample codes here for reviewing and testing. Any help is greatly appreciated.

 

==================== demo.aspx page ====================

<%@ Page

How can i add a textbox into a GridView Cell dynamically and how can i retrieve entred data

  
Hey, i think that the the subject can explain what i need, it's about adding a TextBox control with the code behind into a GridView, and also about how can i retrieve entered data after submitting, im using C#,Thanks.

How to I apply an XAML declared animation to multiple controls dynamically?

  
Hello, How to I apply an XAML declared animation to multiple controls dynamically? Here is the XAML declared animation: <Window.Resources> <Storyboard x:Key="TextBlock_SB"> <DoubleAnimation Storyboard.TargetName="TextBlock_1" Storyboard.TargetProperty="(TextBlock.Opacity)" From="1.0" To="0.75" Duration="0:0:0.5" AutoReverse="True" RepeatBehavior="Forever" /> </Storyboard> Here is the code that starts the animation for TextBlock_1: (this.Resources["TextBlock_SB"] as Storyboard).Begin(); I want to apply the same storyboard/animation to TextBlock_2 and TextBlock_3 and perhaps others.  How do I do that without defining more XAML storyboards? Regards, Robert  

Dynamically Created Charts

  
Using SSRS 2008. Is it possible to create a chart dynamically based on data passed in the query and then used in maybe expressions. Example would be if ClientID=1 then create a bar chart for 12 months, column colors would be green, if ClientID=2 then create a quarterly bar chart, column colors would be blue, if ClientID=3 create a 13 month chart (if possible) to show regular 12 months and a 13th month as a YTD column, column colors would be black. Any ideas or help is greatly appreciated

play storyboard with dynamically created image

  
this is my storyboard:   <Storyboard x:Key="expandStoryboard"> <DoubleAnimation Storyboard.TargetProperty="RenderTransform.ScaleX" To="2" Duration="0:0:0.2" /> <DoubleAnimation Storyboard.TargetProperty="RenderTransform.ScaleY" To="2" Duration="0:0:0.2" /> </Storyboard> <!-- This storyboard will make the image revert to its original size --> <Storyboard x:Key="shrinkStoryboard"> <DoubleAnimation Storyboard.TargetProperty="RenderTransform.ScaleX" To="1" Duration="0:0:0.2" /> <DoubleAnimation Storyboard.TargetProperty="RenderTransform.ScaleY" To="1" Duration="0:0:0.2" /> </Storyboard>   and i created image dynamically:   BitmapImage bmp = new BitmapImage(); bmp.BeginInit(); bmp.UriSource = new Uri("file:///" + arrstrFileNames[0].Replace("\\", "/")); bmp.EndInit(); Image img = new Image(); img.Source = bmp; RotateTransform rt = new RotateTransform(); img.LayoutTransform = rt; ScaleTransform st = new ScaleTransform(); st.ScaleX = 1; st.ScaleY = 1; img.LayoutTransform = st; if(first==true) img.ContextMenu = mnu; first = false; assignEv

Dynamically adding User Controls -- newbie question!

  
I am new to ASP.NET (coming from ColdFusion, thank goodness I'm away from that!).  And I am have THE hardest time understanding how to work with forms in ASP.NET.  Here's what I am doing:Dynamically add User Controls to a PlaceHolder based on some int value (which currently is passed in a HiddenField).Fire an event if the WebControls inside of the User Control change, then handle that event in the Main Page (i.e. save the input to DB)When the user clicks the "Next/Continue" button, the next controls for the next page are loaded.And I guess maybe I just can't seem to get how things work in ASP.NET, because I am really struggling with the general idea of how ASP.NET flows.  Should I be dynamically loading the controls in Page_Init, or Page_Load?  Or should I load the controls when the buttonclick event is fired?Do I have to add the axCtrl.OnDataChange += new EventHandler(HandleAxControlDataChange); line on Page_Load?  Or should I put this in When I first load the UserControl, I need to initialize some WebControls within the UserContorl.  Is there a way to know if I have loaded new user controls into my placeholder?  I can't use Page.IsPostback, because after the first page, every page is a postback from the buttonclick.Any help for this confused newbie would be GREATLY appreciated!!Here's what I have: pu
Categories: 
ASP.NetWindows Application  .NET Framework  C#  VB.Net  ADO.Net  
Sql Server  SharePoint  Silverlight  Others  All   

Hall of Fame    Twitter   Terms of Service    Privacy Policy    Contact Us    Archives   Tell A Friend