C# - Adding Dynamic Controls?
Apr 23, 2010
I have a page I need to build out where depending on the selection the user made on a form on the page prior it displays a different set of questions for them to answer.
So say the user selects Reason A from the form on page edit, then it needs to display Questions 1 and 2 on page edit_confirmation. But if they select Reason B then it needs to display Questions 3 and 4.
I'm grabbing the reason code from the query string and have a switch statement set up, but I can't find anywhere how to output different controls. If Questions 1 and 2 are supposed to show up, one could be a text box and the other a checkbox, but if questions 3 and 4 are supposed to show up one may need to be a dropdown list and a checkbox.
EDIT: I'm going to try some of the below suggestions and will be back to mark the answer and upvote accordingly. Thank you all for the quick response.
EDIT EDIT: Both rlb.usa and AndrewVos's answers worked equally well. I went with Andrew's since it seemed like the more "proper" way of doing it.
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Similar Messages:
Aug 10, 2010
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?
void LB1_Click(object sender, EventArgs e)
{
// throw new NotImplementedException();
}
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Jun 22, 2010
I'm listing some controls at my web page dynamically, either I'm adding newline with Label's.
Label newLine = new Label();newLine.Text = "<br/>"; myPanel.Controls.Add(newLine);
How can I do it in a different way?
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Jul 28, 2010
So am adding fields in the code behind and now want to add required field validators. Kicker, I think comes into play becasue all this is in a master page. So even though I may set the id of the textbox to say tb4, it's no longer tb4. So when I add the required field validator and tell it the control to validate is tb4, I get the yellow screen of death telling me thtat tb4 does not exist... cause it's the long huge master page ID. What do I do?
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Feb 20, 2010
I am adding controls dynamically in my webpage.
I add them in onload method.
everything is working fine..
But I m a bit confused about how it works..
I have read in so many articles that all controls get their values from viewstate before load event. Then how my dynamically added controls get their values when i am adding them in OnLoad event ie after LoadPostData event.
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Sep 17, 2010
I want to add more controls to page based on some specific conditions. Those controls don't need any ViewState or binding data, it is as simple as a static link. I wonder where I could write the code: inside OnLoad or OnInit method? and why? If I place it inside OnLoad, should I add following line: if (IsPostBack) return; before any initialization code?
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Feb 22, 2011
I have a panel with two static buttons. A "Ok" button and a "Cancel" button". Depending on ther client actions, one or more controls will be added to the panel. Is there a way I can add the dynamic controls above the static ones?
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Feb 21, 2011
There are two fields and a button :
1)text box for the caption.
2)drop down list to select the control to be added.
3)button is an ADD button .
when the "ADD" button is clicked the text entered in the "caption" text box has to appear in the first cell of the first row in the table and the control selected from the dropdown list has to be added to the second cell of the same row. similarly many such captions and controls have to be dynamically addded to the successive rows of the table as per user selection ( note: the previously selected control and caption label must persist on furthur selections .
how do i go about the adding controls and the text into the table part ?
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Dec 29, 2010
I've got an image URL in a gridView which retrieves the name of a file, but I need to add some text to the start and end of the value returned. This is the code so far:
[Code]....
The image URL renders as 'filename.png', but I need to add 'about-us/images/' before it.
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Mar 16, 2011
I have what is probably a basic question but I do not understand if/why there is a difference. I have a simple asp.net page with a staticly created DropDownList and Panel control. The user can select one of three options if the drop down (Employee, Company, Address) which should load the respective custom UserControl into the panel below. By default, I have the Employee control selected in the drop down and it should be displayed on the intial Page Load (!Page.IsPostBack).
If I do the following it performs the desired behavior on the intial load:
[Code]....
If I try the following, the User Control does not appear on the initial page load:
[Code]....
I noticed if I do it with a textbox instead of a UserControl, it works however:
[Code]....
I assume there is some sort of behavioral difference in the way the loading is done between a UserControl and WebControl.
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Mar 2, 2011
I have a Gridview on my aspx page. On my page_load event I check for a record in the database, if the record exists for that row in the gridview I would like to add a new column in the same gridview and add a button control to it. This adding of new column in the Gridview should happen in the codebehind (c#). see the code I wrote for this, but when I run it, it does not create any column on the gridview page.
[Code]....
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Nov 28, 2012
i have read and used this script.Adding Dynamic Rows in ASP.Net GridView Control with TextBoxes..it is very usful to me but i want to fetch data from sqll database and fill the newest row with it. the past row data hav to be remain same. becoz of the same name of textbox it happens. whenever i try to fetch data from database and fill textbox all rows get updated with the same data.
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Feb 11, 2010
I'm trying to add an DropDownList to a DetailsView by code, because i'm writing a solution that let's the user select an table and view your records and edit them, some of theese tables, have a foreign key column and the user must have to select some item in the list.
Below is my sample code:
[Code]....
the code above is working correctly, when the user click in the buttons New or Edit , the DetailsView opens correctly, showing the DropDownlist, but when the user click in the buttons update or insert , an error occurs, the viewState cannot be loaded:
Failed to load viewstate. The control tree which viewstate is being loaded must match the control tree used to save viewstate during the previous request. For example, when controls are added dynamically, the controls added during a post must match the type and position of the controls added during the initial request.
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Aug 18, 2015
As per you sample : [URL] ...
How do I add maximum rows that can be added ?
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Sep 22, 2013
I am using this reference to make some application .. In this article we can only save with varchar data types
So how to use some other data types like datetime, money, int..or how to use parameters to convert data.
[URL] ....
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Jun 9, 2010
how to retrieve from the server-side contained a table html constructed this way:
<table id="myTable" >
<tr>
<th> <input type="text" value="name"/></th>
<th> <input type="text" value="quantity" /> </th>
</tr>
<tr>
<th> <input id="name_1" value="phone" /> </th>
<th> <input id="quantity_1" value="15" /> </th>
</tr>
<tr>
<th> <input id="name_2" value="mp3" /> </th>
<th> <input id="quantity_2" value="26" /> </th>
</tr>
</table>
I can not make use of <asp:Table> ... because for technical reasons I did not find a solution following this post: [URL]
How can retrieve the contents values of my table (dynamic) for each row. Rows will be added in client-side js
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Jun 9, 2010
How can I add rows in a table from server-side?
if (!Page.IsPostBack)
{
Session["table"] = TableId;
}
else
{
TableId = (Table)Session["table"];
}
protected void btnAddinRow_Click(object sender, EventArgs e)
{
num_row = (TableId.Rows).Count;
TableRow r = new TableRow();
TableCell c1 = new TableCell();
TableCell c2 = new TableCell();
TextBox t = new TextBox();
t.ID = "textID" + num_row;
t.EnableViewState = true;
r.ID = "newRow" + num_row;
c1.ID = "newC1" + num_row;
c2.ID = "newC2" + num_row;
c1.Text = "New Cell - " + num_row;
c2.Controls.Add(t);
r.Cells.Add(c1);
r.Cells.Add(c2);
TableId.Rows.Add(r);
Session["table"] = TableId;
}
in debug I found out the number in the "TableID", but the rows are not drawn. Have you got an idea about this issue?
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Apr 1, 2011
I have a page with a dynamically created command button. I need to dynamically wire up a click event so I can grab the CommandArgument of the clicked button.
Button b = new Button();
b.ID = "btnTrigger2";
b.CssClass = "hiddenBtn";
b.CommandName = "lbl3";
b.Click += new EventHandler(btnTrigger_Click);
The problem is the last line - I can't wire up an EventHandler this way - I need to use the standard EventArgs instead of CommandEventArgs. There's got to be a way.
EDIT
Figured I'd post the code that finally worked in case anyone else tries to do the same thing.
string tabLoadedScript = string.Empty;
string postBackScript = string.Empty;
string script = " <script language='javascript' type='text/javascript'>" + System.Environment.NewLine;
script += "function clientActiveTabChanged(sender, args) {" + System.Environment.NewLine;
int i = 0;
foreach(TabPanel tp in tc1.Tabs)
{
Button b = new Button();
b.ID = "btn" + tp.ClientID;
b.CssClass = "hiddenBtn";
b.CommandName = tp.ID;
b.Command += btnTrigger_Click;
this.form1.Controls.Add(b);
AsyncPostBackTrigger trg = new AsyncPostBackTrigger();
trg.ControlID = "btn" + tp.ClientID;
tabLoadedScript += "var isTab" + tp.ClientID + "loaded=$get('" + tp.Controls[0].ClientID + "');" + System.Environment.NewLine;
postBackScript += "if(!isTab" + tp.ClientID + "loaded && sender.get_activeTabIndex() == " + i + ") {" + System.Environment.NewLine;
postBackScript += "__doPostBack('" + b.ClientID + "','');}" + System.Environment.NewLine;
i++;
}
script += tabLoadedScript;
script += postBackScript;
script += "}" + System.Environment.NewLine;
script += "</script>";
this.ClientScript.RegisterClientScriptBlock(this.GetType(), "cs", script, false);
protected void btnTrigger_Click(object sender, CommandEventArgs e)
{
System.Threading.Thread.Sleep(2500);
Panel ctrl = (Panel) FindControlRecursive(this, "pnl" + e.CommandName);
ctrl.Visible = true;
}
public static Control FindControlRecursive(Control Root, string Id)
{
if(Root.ID == Id)
return Root;
foreach(Control Ctl in Root.Controls)
{
Control FoundCtl = FindControlRecursive(Ctl, Id);
if(FoundCtl != null)
return FoundCtl;
}
return null;
}
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Jun 16, 2010
I Have this code in my page, and I want that every NavigateUrl display another page like : simple.aspx? id=1, simple.aspx?id=2, ...
Where id = c
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
Dim c As Integer = 0
While c < 5
Dim Label1 As New Label()
Dim ltr As New Literal()
Dim link As New HyperLink()
link.NavigateUrl = "simple.aspx"
link.BackColor = Drawing.Color.Aqua
Label1.Text = c.ToString()
ltr.Text = "<br/>"
PlaceHolder1.Controls.Add(Label1)
PlaceHolder1.Controls.Add(link)
PlaceHolder1.Controls.Add(ltr)
c += 1
End While
End Sub
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Apr 30, 2010
I have this code
protected void Page_Load(object sender, EventArgs e)
{
DataSet.DestinationsDataTable GetDestinations = (DataSet.DestinationsDataTable)dta.GetData();[code]....And it's returning this error (on a content page)The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).
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Jan 7, 2010
I got a problem in adding a Dynamic Dropdown to the asp page.
Here is the description:
Im trying to create Dropdown dynamically based upon the values returned from the database.
For example,
if database returns three records like A,B,C(These are the values to be selected of the drop down)
I wrote a Method which will accept the
private void addDropDowns(int iPhyLoc,int iDdlCnt,string sAxnCd)
{
DropDownList ddlMitigtAxnCd = new DropDownList();
ddlMitigtAxnCd.ID = "ddlMitigtAxnCd" + iPhyLoc.ToString() + iDdlCnt.ToString();
ddlMitigtAxnCd.Items.AddRange(listMitigtAxnCd);
ddlMitigtAxnCd.SelectedIndex = ddlMitigtAxnCd.Items.IndexOf(ddlMitigtAxnCd.Items.FindByText(sAxnCd.Trim()));
ddlMitigtAxnCd.Attributes.Add("style", "font-family : Arial, Helvetica, sans-serif;"+"font-size : 10px;color : black;");
this.FindControl("PnlAxnCds" + iPhyLoc.ToString()).Controls.Add(ddlMitigtAxnCd);
}
[Code]....
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Apr 4, 2011
I am working on a Flash training video. I would like at the end of the video for a message to pop up with a dynamic confirmation code. I have the code for the confirmation code, but am having trouble creating something either at the end of the flash video or within the aspx page to trigger this message.
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Aug 19, 2012
while a new row is adding in gridview, the data is binding only new rows. the old rows are not coming.Data is coming from the profile properties.Add new row command event is listed below
bool isUserAccountCreated = false;
UserProfile profilenew = new UserProfile();
if (e.CommandName == "AddNew")
[code]...
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May 16, 2012
I want to add multiple textbox value into table in single click.
E.g. :
category subcategory
fruit juiceshop
fruit icecream
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Dec 3, 2010
adding rows to dynamic table in masterpage?
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