Dynamic User Controls
Oct 6, 2011
Here is my code for my whole form. When the page posts back, the user control is there, and the data entered in the Text Boxes are populated, but when I try to pull data from the to save it to the database (btnSave_Click) the fields come back as empty. How do I in code get data from my User Control fields.
Code:
Partial Class Customer
Inherits System.Web.UI.Page
Dim controlID As String = "Contact"
Shared createAgain As Boolean = False
[code]...
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Similar Messages:
Jan 24, 2011
I am trying to lear how to create Dynamic User Controls in asp.net. I just know that this type of controls are created or loaded at run time. Someone knows a good tutorial about this topic?
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Nov 9, 2011
This is probably so simple but I've tried and failed!
I want to put my controls is a folder to keep the project tidy. So I ended up with this code:
Dim wucDayNum As Control = LoadControl("~/Controls/wucOnightOpsDayNum.ascx")
wucDayNum.ID = "wucDayNum" + "1"
pnlDayNum.Controls.Add(wucDayNum)
Then I tried something like:
Code:
Dim wucdn As wucOnightOpsDayNum = pnlDayNum.FindControl("wucDayNum1")
Dim txtMyName As TextBox = DirectCast(pnlDayNum.FindControl("wucDayNum1"), wucOnightOpsDayNum)
Both lines tell me that wucOnightOpsDayNum is not defined. What is the syntax to find my control in the /controls folder?
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Jan 31, 2011
I have an existing application of 20 equal user controls. Each user control contains a complex calculation. I have 2 lines visible as a start and when activating line 2 then line 3 becomes visible, when line 3 is activated line 4 is visible and so on. However this results in a very slow application! So instead I would like to dynamically load the user controls one by one.
So my question is: How do I load the user controls to the website by raising an event?
My existing code in html is:
Code:
<uc1:HeatSimpleLine ID="HeatSimpleLine1" runat="server" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine2" runat="server" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine3" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine4" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine5" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine6" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine7" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine8" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine9" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine10" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<!-- 11 til 20 -->
<uc1:HeatSimpleLine ID="HeatSimpleLine11" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine12" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine13" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine14" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine15" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine16" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine17" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine18" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine19" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine20" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine21" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine22" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine23" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine24" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine25" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
instead I would only have the first to user controls visible and loaded and the loading the user controls as I need them for improving the performance of the application and thereby I will not be limited by only 20 user controls in the application. add example codes
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Sep 16, 2010
I m getting Problem in Tab Index Setting of Dynamic Created Controls. There are 6 Drop down dynamic created and also Two user controls which contains text boxes. There are also Static Controls on a Page. How i set tab index for all controls. I have try to give from code behind using TabIndex property But it's not working and Tab order get destory.
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Jan 12, 2011
I have user controls those will be loaded during OnInit() to update panel.
on timer tick I would like to get new data adn remove those already added dynamic contorls and relaod them wiht new data.
even though I am updating the update panel place holder with new data, on the screen the old data will be shown.
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Mar 10, 2010
I created an ASP page which contains a MultiView and two buttons, it is as below
<div style="width:700px; background-color:White">
<asp:MultiView ID="mvAgreement" runat="server"
onactiveviewchanged="mvAgreement_ActiveViewChanged"> [code]...
The first and third view are simple now.The second view contains a user control AgreementDetailUC, which dynamically loads many other user controls onto several dynamically created tabs, as show below
AgreementDetailUC.ascx is like:
<div style="width:700px; background-color:White; text-align:left">
<cc1:TabContainer ID="tcAgreementDetail" runat="server" Height="300px" AutoPostBack="false">
</cc1:TabContainer>[code]....
When <Next> and <Previous> button is clicked, it take several seconds to show the second view. Page_Init is run very fast, it seems the time is spent on rendering the page.
My questions are:
1. How can the performance be improved?
2. How to change the cursor to hour glass when a button is clicked and change it back when the new view is shown (I can set it to hour glass when a button is clicked, but don't know how to set it back to normal).
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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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Jan 27, 2011
Setup:
My page has a drop down whose values are dynamically populated. Based on which item is selected, a number of TextBoxes are dynamically created during runtime.The user then fills in information into the textboxes and clicks a submit button.
Problem:
After postback from the submit button, I need to again dynamically create the TextBoxes during Page_Init (BEFORE LoadViewState) so that after the ViewState loads, my Button_Click event can save/do whatever with the user input. PROBLEM is, I cannot recreate the textboxes based on the selection in the dropdown, because the dropdown hasn't been "selected" yet by LoadViewState.
SO, how can I read from the view state, create my textboxes, then let the viewstate populate the textboxes, and then the Button_Click will use the values??
The one thing I've attempted is to override the LoadViewState function so that I can read from the view state, create the boxes, and then load the viewstate again. This did NOT work, because the debugger never seemed to hit my overridden function.
[code]....
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Jan 19, 2010
I have been playing around with loading user controls in a CMS style where I can change the position and order. I have come up with this...
[Code]....
It all works fairly well - but I have alot of propertys in my user control code behinds where I could inject values into the usercontrol from my base class.
I like the way I can position usercontrols from the DB, I even added a time and date section where they could be switched on and off per day or time.
If I make every user control access the DAL for the data, it means i will have one select per user control, which means including my bassclass I could have upto 15 selects (visits tot he DB) to make the front page. Though this does not seem to make a performance problem, I was wondering if there was a better way of doing this.
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Jun 8, 2010
I am using two user controls in my page. The controls are loaded dynamically one at a time. I'm just referencing the user controls in the page and loading them dynamically using 'LoadControl()'. Everything is working fine till now and the user can switch the controls one another.
Here the issue I found is eventhough the controls are working as expected and the data is visible, the rendered HTML contains only the first loaded user control's markup.
Even if the current control displayed is 'usercontrol2', the source shows 'usercontrol1' markup. How can I force the page to render 'usercontrol2' markup and remove 'usercontrol1' markup while loading'usercontrol2'?
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Dec 15, 2010
I have several dynamic user controls,that I want to load them in seperate tab panels.but my problem is when the postback occures my user controls disapeare from my tabpanels. however I want to keep my user controls in my tabs whenever I click on each tab.
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Jun 1, 2012
i saw a post you wrote a few years ago, and you were saying how to do this task, but it was required te change the encription type. Since i'm in a user Control (and inside a Master Page), i've been trying several solutions in the web, but none of them has been satisfactory.
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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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Dec 13, 2010
I am dynamically loading user controls into my main page on button event.The user control has a textbox and a gridview When i enter data in textbox , the autopostback event fires and loads data into the gridview. when i load another instance of user control and do any post back the gridview data is not persisting.Until and unless I bind the data, gridview is not having any data after postback.This is creating issue when I al updating a row in gridview as data is not persisting after postback.
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May 7, 2015
I want to add a new rule in my web.config file programmatically,
ex: I have a textbox to add location path I have a combobox (with items admin and user) to add roles. ex: user input location path = textbox roles = combobox (items admin and user) the save button, when click the save button the results go to the web config :
<location path="Report/ManageReport.aspx">
<system.web>
<authorization>
<allow roles="ADMIN" />
<deny users="*" />
</authorization>
</system.web>
</location>
So far my code as below: but I was confused to apply its
protected void AddRoleRule(string location, string selectedrole)
{
Configuration config = WebConfigurationManager.OpenWebConfiguration(Server.MapPath("~/Web.config"));
XmlDocument xDoc = new XmlDocument();
xDoc.Load(config.FilePath);
//if the rule exists update the rule
[Code] .....
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Oct 13, 2010
I am familiar with creating and persisting dynamic controls on the first load of a page and on subsequent postbacks but I am having trouble with the following user initiated scenario...
In my demo I have a placeholder, two buttons and a literal
[code]....
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Jan 7, 2010
I am in need of some assistance in regards to how to best set the values of properties for a Web User Control which is being included into a cell of a GridView with dynamically created columns. I have tried a few different approaches, but can't seem to get a satisfactory result. Also, to be completely honest, I am not really sure if I am using best practices for what I am trying to accomplish.
First off a little background:I have a GridView for which we will never know the exact number of columns at run time. The columns are predicated by user selection. I am creating the command text for the DataSet on the fly and then looping through the columns of the resulting DataTable in order to use custom TemplateFields. This works ok for just printing out the row values but not so much for when I need to insert the Web User Control into a cell.The Web User Control is in essence a collection of image links which are used as a "Quick Nav" tool. I need to pass the values of 2 fields from each DataRow to the control via properties (for example, CustID and ProductID). I am using custom TemplateField classes inheriting from ITemplate for displaying my fields and extending the DataBinding event like so: [Code]....
This won't work for my User Control as DataBinding is called after the control is loaded into the page and I need the properties to be set before the Page_Load event of the control is fired.Is there a GridView event I should be looking into instead such as RowCreated or RowDataBound? Or should I modify how I loop through the DataTable by doing rows first, then the resulting columns as I've seen done elsewhere?
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Nov 16, 2010
I'm customizing a NopCommerce store, and am using a gridview to display and sort the products. All that works well. I like how the external pager (user control) works with the gridview, with one exception -- it uses the hyperlink control, so I lost viewstate, which I need to retain for both the search page and to retain the gridview sort options. Based on the page selected (from the pager control), I query the database and rebind the gridview. So, I switched the user control to use LinkButtons instead of Hyperlinks. This is the sample code for one of the buttons:
[Code]....
I set a breakpoint inside the lbCommandClick method, but it never gets hit. Reading other posts tells me that I would have to add the dynamic controls in the OnLoad method, but since this all happens based on other data on the page (say search results), I don't think I can do it onLoad. However, the link buttons do work to cause a postback, and my viewstate is saved correctly. The only problem is that I do not know which button was clicked. I could check Request.Params["__EVENTTARGET"] onLoad, but that is kind of a hack -- I'd much rather be able to set the event handler in the user control and use the CommandArgument property. But, what I have tried so far fails.
Especially one that would allow me to set the EventHandler in the User Control? (e.g. OnlbCommand="PagerLBPageChange" )
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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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Dec 11, 2013
I have a Webform with a TextBox (Static) and 3 TextBox (Dynamic - based on the following article: [URL].... )
How to use this scenario with a single GridView table?
Based on the User input, the GridView might have (1 + 3) columns; (1 + 6) columns; (1 + 9) columns; ...etc.
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Jul 24, 2013
im creating dynamic buttons on page load and on the click event of button1 handlere iam creating more buttons this is going fine but on click event of button 2 work is not done so how to maintain a chain of creation of button on click events
protected void Button2_Click(object sender, EventArgs e)//
{
ClientScript.RegisterClientScriptBlock(this.GetType(), ((Button)sender).ID, "<script>alert('Button_Click');</script>");
Response.Write(DateTime.Now.ToString() + ": " + ((Button)sender).ID + " was clicked");
}
protected void Button_Click(object sender, EventArgs e)//this button click will call all the items related to department
[code]....
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Jan 28, 2011
Lets say I have a Web Application with a menu of products. When a user clicks a menu item, then create and display a dynamic set of controls in an Update Panel. I am currently doing this however the PostBack and recreation of controls is tedious and resource intensive.
Not sure about this but is it possible to build a webpage with controls on it, then display it in update panel or IFrame? Then on post back you wouldn't have to recreate everything all over again?
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Apr 1, 2011
I have a loop which creates for each item ID a Dynamic created checkboxlist control
how do I create a dynamic validation control on a dynamic checkboxlist?
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Oct 3, 2010
I want to dynamically add a web user control to a web form. Everything I've read so implies that I should be able to use the PlaceHolder web server control for this, yet I cannot this to work. I've created a simple test to just try to master this concept, yet I can only get non-web user controls added. Can anyone tell me what I'm doing wrong? Below is the entirety of my code.
.aspx Page:
[Code]....
.aspx.cs Page
[Code]....
.ascx for TestControl
[Code]....
.ascx.cs for TestControl
[Code]....
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