I need to create a .NET control (in ASP.NET) from a string that represents the control's name.
Control myList = SomeSystemClass.GetControlByName("DropDownList");
I guess there is some reflection method in the .NET platform that allows this but I have no idea which one.
I have a custom DDL that lives in my Server control library. Currently I add this control to a table by strongly typing the name of the control, the customary way.
Control_Library.Report_NumberDDL newDDL = new Control_Library.Report_NumberDDL();
What I want to be able to do is dynamically create that control by pulling the control name from a table. So I would have the name of the control in my code, in this case "Report_NumberDDL", and I would like to then create the control without having to strongly type it.
Something like this, though I know this doesn't work:
string controlName = "Report_NumberDDL";
Control_Library."controlName" controlNum1 = new Control_Library."controlName"();
Edit:I tried to do this:
Type type = Type.GetType("Control_Library.Report_NumberDDL");
object control = Activator.CreateInstance(type);
But on the CreateInstance(type) I get a null value exception. So the Type isn't getting created correctly.
i have a gridview control i added checkbox contrl dynamically but i am not getiing the reference of checkbox in button clilck event here is my code Gridvew
[Code]....
.vb code
[Code]....
What I'm trying to do is take an instance of a control, and figure out what the markup would look like based on the property values set in the code behind. We've built a web-based web form designer. At the end of the design process we save the markup. For simple controls with supported types, generating the markup was easy. For complex controls with nested properties or unsupported types, we're faced with creating a custom markup generator for each custom control. I was hoping to find info out there that would jump start this development effort.
In simple terms, I have this:
Dim Ctl as Control = CType(Asm.CreateInstance("MyNameSpace.MyControl"), Control)
Ctl.Name = "Name of my control"
And I want to end up with this:
<cc1:MyControl ID="MyControl1" runat="server" Name="Name of my control" />
My scenario require's me to create a control from a string that contains the controls name, for example
string a = "TextBox";
using the above string a i need to create the control.Iam using Visual Studio 2008 Pro ASP.Net 3.5
I want to do something like the following in an asp.net web form but get a Invalid Token error message:
<ul>
<%foreach (var item in Items) {%>
<li>
<asp:TextBox ID="<%= item.Id %>" runat="server" />
</li>
<%} %>
</ul>
What alternative methods are there to achieve the desired result?
i have one html table "table "and added controls it at run time as :
HtmlTableRow tabelrow = new HtmlTableRow();
HtmlTableCell tablecell = new HtmlTableCell();
Label lbl = new Label();
tablecell.Controls.Add(lbl);
then i want to get each controls by using foreach
such as (foreach control c in table.controls) or (foreach control c in tablecell.controls)but its not working.
how to add dynamically control to a table
View 3 RepliesI'm trying to make web form with two placeholders. Firs holder contains user control witch has list of buttons, each button opens different user control to second placeholder.
I get it to show user control in second placeholder but i can't get dynamically created user controls to fire events.
So how i can dynamically create working user control with button click?
Here is how i create those controls:
[Code]....
"field" is hidden field containing filename of user control to be created.
I have a fileupload control.I'm selecting a image using the control and saving it in the database.In the edit mode,I need to assign the path of the image in the textbox of the file upload control.Is it possible ?
View 2 RepliesI am using Ajaxtoolkit in my application. I am declaring the tabcontainer and tab panels on the serverside. I just have my Updatepanel on the Client-Side. I was wondering how to assign css to the tabs like onhover or click would change its background color and highlight the tab up.
Secondly, since I am dynamically creating these tabs, how would I put a close for each of the tabs?
I have one label and table control in my webusercontrol.In my web form i want to add my webusercontrol dynamically and also i want to update value of label and table in my webusercontrol. I have tried using LoadControl method. The problem I am facing is that in my webform I am able to see webusercontrol but I am not able to update values.
View 8 RepliesSuppose I have two controls in my page named Textbox1 (For the purpose of taking Employee ID as input) and another one is Button1.
I am using northwind data base and my server name is "DON".
The thing which i want is that when i click on the button1 the task showing below should be:
1. Disable the page (Like when we download the Ajax Tool kit from the Codeplex. An agreement come and the page gets disable)
2. A panel should be display as Image Shown Below
Is it Possible with the help of query string (if yes please make your answer query string oriented) a close button should be appear also in the top right corner of panel which should close the panel and re enable the form.
Code-behind:
[code]....
The step show at the left bar with the Title, but the HTML (fieldset and the paragraph) is not displayed in the step. It requires to be a TemplatedWizardStep too because we use Template for the layout. How do I add a Step dynamically?
I am having issues with my dynamically loaded control's events.Here is how I am loading the control:
protected void Page_Load(object sender, EventArgs e)
{
LoadSubPageEditTemplate();
}
protected void LoadSubPageEditTemplate()
{
pnlPageTemplate.Controls.Clear();
BaseOfferAdmin adminControl = (BaseOfferAdmin)this.LoadControl("~/Controls/SingleOfferAdmin.ascx");
if (adminControl != null)
{
adminControl.ID = "Control_ID"
pnlPageTemplate.Controls.Add(adminControl);
}
}
}
The LoadSubPageEditTemplate() is also fired from a button event on the page, since I have to update it after the button event has executed.
The control loads perfectly, I have tested it with a basic button and the postback fires as expected. However, I am getting weird results with CheckBoxes.
<asp:CheckBox runat="server" ID="cbOptionalAction" Text="CheckBox" AutoPostBack="true" OnCheckedChanged="cbOptionalAction_CheckChanged" />
The CheckedChanged event only fires when the Checkbox is checked, which I guess means there is some issue with my control viewstate. If I have multiple checkboxes on the page, and one creates a postback, the checkchanged event is fired for each checkbox that is checked.
I'm writing a program that inserts controls onto a webform dynamically. Depending on a variable, I add either a textbox, a set of radio buttons, or a set of checkboxes. Later, after a user clicks a submit button I need to use the controls to determine if the user is submitting the correct answer, but when I try to reference the id of a control, I get "txtAnser is not declared. It may be inaccessible due to it's protections level.
Here is the .aspx page (it's the standard content page of a master page):
[Code].....
I am iterating through an array:
Dim dbConfig As New pbu_housingEntities
Dim possible() As String = {"FROD", "FRCD", "SOOD", "SOCD", "JROD", "JRCD", "SROD", "SRCD", "SR5OD", "SR5CD"}
For Each value As String In possible
Dim current_value = value
Dim exists = From p In dbConfig.Configs _
Where p.Description = current_value
Select p
If exists.Count.Equals(0) Then
Dim create As New Config
create.Description = current_value
dbConfig.Configs.AddObject(create)
dbConfig.SaveChanges()
Else
Dim update_query = (From p In dbConfig.Configs _
Where p.Description = current_value _
Select p)
update_query.First.Description = current_value
update_query.First.dateValue =
End If
Next
Towards the end of the array you can see update_query.First.dateValue =, I'd like to do something like this: update_query.First.dateValue = "txt" + current_value + ".Text" But I don't want it to return the literal txtcurrent_value.Text, but rather to return the text value of txtcurrent_value.Text. This is easy to do, if you know each control name - but in this case I'm iterating, otherwise I could do:
update_query.First.dateValue = txtNameofControl.Text
I have linkbutton within the repeater. The ID of the repeater is "lnkbtn".
I have a datatable containing a column called as "Questionnumber".
The "Questionnumber"(column) contains records such as 1,2,3,16,24.....so on.
I want to set the ID of the linkbutton dynamically.This id must be respective to the "Questionnumber".
if i set ID of the linkbutton(within repeater) as ID='<%# Eval("Questionnumber") %>' , i face problem when i intend to write the coding as repeater1.Items[].Findcontrol("lnkbtn")
I have this GridView that have it's DataSource as a list of previously selected products.
For every item on it, I need to Eval it's ID and load a specifc form that the user must fill, then after that i've got to update the GridView.
I have made those specific forms as User Controls, is this the best approach for this scenario?
If yes, how can I dynamically load them, in a way that I can make queries/postbacks then update back my gridview?
A have a ListView that is rendered with multiple items. Now I want to toggle some HTML attributes with JQuery. Therefore it would be best to have access to these elements via an unique ID.
But trying to create a "dynamic" and therefore unique ID by
<tr runat="server" ID='<%# this.GetUniqueID() %>'>
</tr>
results in an error that tells me that the ID needs to be simple and cannot be set by a call to a method.
I know that I can dynamically create controls in the code-behind and set the ID there. But in this case, I'd rather like to let the content be rendered by the ListView itself.
That brings me to the conclusion that the idea of setting a dynically ID in the Template is totally wrong. How can I achieve the desired behaviour?
Edit: Ok I just found out, that I can set the ID with a BindingExpression, like
ID='<%# Eval("MyColumnWithUniqueID") %>'
Still, is there another, or even better solution to this?
for creating an example for dynamically loading a repeater control retrieving records via stored procedures from code behind code on button click.
View 1 Replies[code]....
This code DOES Create the Text "TOTO" but does not create image "Targetvignette"the code works ok with BUTTON object as opposed to Image.I have manually created a image with the toolbox using exactly the same credential, this displays OK.it does not catch any exception it just doesnt display anything on the webpage.I can create all sorts of control but not image [Image button] is not that better as it seams to be create but I got no image just "SUBMIT QUERY" textI am confused and stock I have tried i think every single property of the image object i could find.
i want to validate date format in textbox through regulrexpressionvalidator control but i want to check ValidationExpression from my clsdate class this public variable.
Public DateFormat As String = "dd/MM/yyyy"
<asp:RegularExpressionValidator ID="revDOE1" runat="server"
ControlToValidate="txtlFollowUp_date" ErrorMessage="Wrong Date Format" ValidationExpression="^(((0[1-9]|[12]d|3[01])/(0[13578]|1[02])/((1[6-9]|[2-9]d)d{2}))|((0[1-9]|[12]d|30)/(0[13456789]|1[012])/((1[6-9]|[2-9]d)d{2}))|((0[1-9]|1d|2[0-8])/02/((1[6-9]|[2-9]d)d{2}))|(29/02/((1[6-9]|[2-9]d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))))$"> </asp:RegularExpressionValidator>
or can i have any other way or validation control
I am trying to use my user control on my page which should load with data from a datatable. When the PageLoad event fires up I got the following message:
Object reference not set to an instance of an object. Description: An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
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here is the page code which cause the error message:
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I am not able to get the htmlinputimage control id created dynamically based on no of rows reterived from db.
these controls are bn created in usercontrol (.ascx.vb) page
The actually requirement is ...there are set of images in a table, i need to get a particular image src, based on that i need to collect the image id(s) and use it for futher process...
and this is poosible using a FindControl... which i have bn trying , but all invain...