Web Forms :: Accessing Dynamically Loaded Controls

Oct 25, 2010

My aspx has a placeholder I am dynamically loading a user control into the placeholder

like this:

Control dynamicControl = Placeholder1.Page.LoadControl("~/SiteUserControls/Message/MessageInbox.ascx");

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Similar Messages:

Accessing Value From The Controls Within A Dynamically Loaded Web User Control?

Jul 31, 2010

I have created a web user control (MemberDetails.ascx) which is loaded dynamically on a page (Member.aspx) for my website. The control has some TextBoxes. I want to store the values inputted by a user in these TextBoxes to a database on the click event of a button that is on the Member.aspx page (i.e. not a part of user control).

I'll use a small code for example.

Member.ascx page:

[Code]....

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Web Forms :: Prevent Unload Controls Loaded Dynamically

Jan 13, 2010

I'm developing an ASP.NET Web application with WebForms and C#.
I have this aspx page:

<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div id="divBody">
<div id="divHeader">
<asp:Button ID="Edit" runat="server" Text="Editar" onclick="Edit_Click" />
</div>
<div id="leftColumn">
<asp:UpdatePanel ID="UpdatePanelLeft" runat="server">
<ContentTemplate>
<asp:Label ID="TryText" runat="server"></asp:Label>
<asp:TreeView ID="DestinationTree" runat="server" ImageSet="Simple">
<ParentNodeStyle Font-Bold="False" />
<HoverNodeStyle Font-Underline="True" ForeColor="#5555DD" />
<SelectedNodeStyle Font-Underline="True" ForeColor="#5555DD"
HorizontalPadding="0px" VerticalPadding="0px" />
<Nodes>
<asp:TreeNode Text="Raiz" Value="Raiz">
<asp:TreeNode Text="Destino_1" Value="Destino_1">
<asp:TreeNode Text="Punto_1_1" Value="Punto_1_1">
<asp:TreeNode Text="Contenido_1_1_1" Value="Contenido_1_1_1"></asp:TreeNode>
<asp:TreeNode Text="Contenido_1_1_2" Value="Contenido_1_1_2"></asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="Punto_1_2" Value="Punto_1_2">
<asp:TreeNode Text="Contenido_1_2_1" Value="Contenido_1_2_1"></asp:TreeNode>
</asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="Destino_2" Value="Destino_2">
<asp:TreeNode Text="Punto_2_1" Value="Punto_2_1"></asp:TreeNode>
<asp:TreeNode Text="Punto_2_2" Value="Punto_2_2">
<asp:TreeNode Text="Contenido_2_2_1" Value="Contenido_2_2_1"></asp:TreeNode>
</asp:TreeNode>
</asp:TreeNode>
</asp:TreeNode>
</Nodes>
<NodeStyle Font-Names="Tahoma" Font-Size="10pt" ForeColor="Black"
HorizontalPadding="0px" NodeSpacing="0px" VerticalPadding="0px" />
</asp:TreeView>
</ContentTemplate>
</asp:UpdatePanel>
</div>
<div id="rightColumn">
<asp:UpdatePanel ID="UpdatePanelRight" runat="server">
<ContentTemplate>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Edit" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
</div>
</div>
</form>
</body>

It is a header with two columns: On left column there is a TreeView, and on the left there is nothing (now there is a label to try the thing that I want to do).

When user select a node on treeview a click on Edit button. Code for click event is:

protected void Edit_Click(object sender, EventArgs e)
{
if ((DestinationTree.SelectedNode != null) &&
(DestinationTree.SelectedNode.Depth > 0))
{
BaseControl baseControl = new BaseControl();
UpdatePanelRight.ContentTemplateContainer.Controls.Clear();
switch (DestinationTree.SelectedNode.Depth)
{
case 1:
baseControl = (BaseControl)LoadControl("~/DynamicControls/Control1.ascx");
break;
case 2:
baseControl = (BaseControl)LoadControl("~/DynamicControls/Control2.ascx");
break;
case 3:
baseControl = (BaseControl)LoadControl("~/DynamicControls/Control3.ascx");
break;
}
UpdatePanelRight.ContentTemplateContainer.Controls.Add(baseControl);
}
}

Depending on node selected depth is going to load a custom control dynamically. It works, but when the user select another node on treeview, the original label is reloaded on right column.

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Forms Data Controls :: Update Dynamically Loaded FormView?

Nov 28, 2010

I'm dynamically loading a user control with a form view inside, when I'm trying to update the form view the user control disappears on the post back and update never happens;

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Web Forms :: When To Wire Up Event Handlers For Dynamically Loaded User Controls

Jul 15, 2010

I have a situation where I dynamically load one of twenty user controls at a time in an ASP.net web page. Based on much reading I've done, I understand that I am to reload the user control upon postback via the Page_Init event handler. This I've done and it seems to work fine.

But now I would like to wire up assorted controls in the user controls such that when the value of each is changed, an event is fired and the web page is notified. Here's an example of how I'm doing that:

userControl.NewData_Handler += new EventHandler(UserControl_NewData_Handler);

There's a problem though. Because the user control is being done in Page_Init (ie. before Page_Load) I don't believe that a line of code such as the one above can function yet.

So I'm wondering what the best practice to do this is. It occurred to me that perhaps I could execute the line in the Page_Load event handler but I'm not sure if that's correct or not.

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Forms Data Controls :: Export To Excel From A Gridview That Is Loaded Dynamically?

Nov 30, 2010

I want to download all the pages from a gridview to excel, I have the code which is working. But the problem is that it gets the data only from the current page.

I tried making paging=false. But it doesnt work. And if i use databind it does not get any data from the gridview.

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Web Forms :: Pass Data From A Page To ASCX User Controls Loaded Dynamically?

Feb 7, 2010

I'm developing an ASP.NET application with C# and Ajax.I have a page that holds user controls loaded dynamically. I need to pass some data (integer values and some strings) to the user control that has been loaded dynamically.Now I use Session to pass these values, but I think I can use another way; something like VIEWSTATE or hidden input.What do you recommend me?The fact that I load the controls dynamically is important because controls are loaded on every postback, and I can't store any value on controls.

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Forms Data Controls :: Dynamically Loaded Usercontrol Won't Fire Button Click Event

Dec 24, 2010

I have a dynamically loaded usercontrol

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="ucEditPanel.ascx.cs"

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C# - Prevent Unload Controls Loaded Dynamically

Jan 13, 2010

I'm developing an ASP.NET Web application with WebForms and C#.

I have this aspx page:

<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div id="divBody">
<div id="divHeader">
<asp:Button ID="Edit" runat="server" Text="Editar" onclick="Edit_Click" />
</div>
<div id="leftColumn">
<asp:UpdatePanel ID="UpdatePanelLeft" runat="server">
<ContentTemplate>
<asp:Label ID="TryText" runat="server"></asp:Label>
<asp:TreeView ID="DestinationTree" runat="server" ImageSet="Simple">
<ParentNodeStyle Font-Bold="False" />
<HoverNodeStyle Font-Underline="True" ForeColor="#5555DD" />
<SelectedNodeStyle Font-Underline="True" ForeColor="#5555DD"
HorizontalPadding="0px" VerticalPadding="0px" />
<Nodes>
<asp:TreeNode Text="Raiz" Value="Raiz">
<asp:TreeNode Text="Destino_1" Value="Destino_1">
<asp:TreeNode Text="Punto_1_1" Value="Punto_1_1">
<asp:TreeNode Text="Contenido_1_1_1" Value="Contenido_1_1_1"></asp:TreeNode>
<asp:TreeNode Text="Contenido_1_1_2" Value="Contenido_1_1_2"></asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="Punto_1_2" Value="Punto_1_2">
<asp:TreeNode Text="Contenido_1_2_1" Value="Contenido_1_2_1"></asp:TreeNode>
</asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="Destino_2" Value="Destino_2">
<asp:TreeNode Text="Punto_2_1" Value="Punto_2_1"></asp:TreeNode>
<asp:TreeNode Text="Punto_2_2" Value="Punto_2_2">
<asp:TreeNode Text="Contenido_2_2_1" Value="Contenido_2_2_1"></asp:TreeNode>
</asp:TreeNode>
</asp:TreeNode>
</asp:TreeNode>
</Nodes>
<NodeStyle Font-Names="Tahoma" Font-Size="10pt" ForeColor="Black"
HorizontalPadding="0px" NodeSpacing="0px" VerticalPadding="0px" />
</asp:TreeView>
</ContentTemplate>
</asp:UpdatePanel>
</div>
<div id="rightColumn">
<asp:UpdatePanel ID="UpdatePanelRight" runat="server">
<ContentTemplate>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Edit" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
</div>
</div>
</form>
</body>

It is a header with two columns: On left column there is a TreeView, and on the left there is nothing (now there is a label to try the thing that I want to do).

When user select a node on treeview a click on Edit button. Code for click event is:

protected void Edit_Click(object sender, EventArgs e)
{
if ((DestinationTree.SelectedNode != null) &&
(DestinationTree.SelectedNode.Depth > 0))
{
BaseControl baseControl = new BaseControl();
UpdatePanelRight.ContentTemplateContainer.Controls.Clear();
switch (DestinationTree.SelectedNode.Depth)
{
case 1:
baseControl = (BaseControl)LoadControl("~/DynamicControls/Control1.ascx");
break;
case 2:
baseControl = (BaseControl)LoadControl("~/DynamicControls/Control2.ascx");
break;
case 3:
baseControl = (BaseControl)LoadControl("~/DynamicControls/Control3.ascx");
break;
}
UpdatePanelRight.ContentTemplateContainer.Controls.Add(baseControl);
}
}

Depending on node selected depth is going to load a custom control dynamically. It works, but when the user select another node on treeview, the original label is reloaded on right column.

How can I prevent this?

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C# - Send Parameters Into Dynamically Loaded User Controls

Sep 19, 2010

I load the content of some User Controls into my page with the use of jQuery. So I have this function that extracts the content from my User Control, and it works like a charm.

public string GetObjectHtml(string pathToControl)
{
// Create instance of the page control
Page page = new Page();
// Create instance of the user control
UserControl userControl = (UserControl)page.LoadControl(pathToControl);
//Disabled ViewState- If required
userControl.EnableViewState = false;
//Form control is mandatory on page control to process User Controls
HtmlForm form = new HtmlForm();
//Add user control to the form
form.Controls.Add(userControl);
//Add form to the page
page.Controls.Add(form);
//Write the control Html to text writer
StringWriter textWriter = new StringWriter();
//execute page on server
HttpContext.Current.Server.Execute(page, textWriter, false);
// Clean up code and return html
string html = CleanHtml(textWriter.ToString());
return html;
}

But I would really like to send in some parameters into my User Control when I create it. Is this possible, and how can i do that?

I can see that LoadControl() can take some parameters with object[] parameters but im really not sure on how to use it.

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Usercontrols - Wiring Events On Dynamically-loaded User Controls?

Mar 14, 2011

For a "dashboard" module I need to dynamically load user controls based on criteria as the user enters the page (role, etc). The problem is that the events are not being fired at all from the controls

As I understand it I need to load the controls in the OnPreInit method of the dashboard page, however I cannot get a reference to the Placeholder control at this point of initialization (i.e. I get a NullReferenceException); trying to load the Placeholder dynamically via Page.FindControl gives me, ironically, a StackOverflowException.

I've tried loading the controls in PreRender and OnInit as well but the events in the controls are not wired up properly and will not fire.

The code is basically this:

[code]....

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JQuery :: Triggering FancyBox From Dynamically Loaded User Controls

Aug 16, 2010

I am following on my own solution to triggering fancybox from asp.net code-behind as here:

http://forums.asp.net/p/1577730/3966910.aspx

But this time I am stuck because my hidden_link control exists inside a dynamically loaded user control, and I do not know it's id, as the id's change to something like this:

ctl00_ContentPlaceHolder1_ctl01_hidden_link2
ctl00_ContentPlaceHolder1_ctl02_hidden_link2
ctl00_ContentPlaceHolder1_ctl03_hidden_link2

I am using
Literal1.Text = "<script>jQuery(document).ready(function() {$("a[id$='hidden_link2']").trigger('click');});</script>";
(which would find an <a> tag ending with hidden_link2) but this only triggers the fancybox for the first user control. How can I inject this script for the required <a> link only? Hope that makes sense.

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Persisting Dynamically Loaded User Controls In View State?

May 13, 2010

I have a simple user control containing two text boxes which I am adding to placeholder on Button Click event. I am storing the number(count) of clicks in View state and running a loop using count to create all previously added user control. I am also adding IDs to each User control (appending "UC" and count). I have also checked in view source the ids are same each time they are created. I have another button which basically does an post back. I have EnableViewState enabled ="true" in all controlls all the way up to Page Level. My problem is that User Input does not persist on postback. Should this not be happening automatically for me?

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State Management :: Dynamically Loaded Controls In Init But Viewstate Not Persisting

Jan 20, 2011

I read this article first to try to solve this issue, but I am already loading the controls in the Init phase of the page, yet viewstate is not persisting. Any ideas as to why? (Of note is that this is for a custom module in DNN and I do have some AJAX update panels on the page, though this section is not within an update panel, for what it's worth.)

As an overview of what I've got:

1. LoadControl.ascx - based on reading query string parameters, determines whether to load the master or the detail .ascx.
2. Master.ascx
3. Detail.ascx

In my master control I dynamically load either a master or detail sub-control in the page_Init. The detail page has a treeview control and then uses a multi-view control to display the panel associated with the depth of the node selected on the tree. On the panel being displayed I have a cascading ddl within a detailsview control which initiates a postback to select the child ddl based on the parent ddl selection. However, when the page refreshes after the postback, both ddls have resorted to their default selection.

What is interesting however, and I just realized this as I am typing, is that the Treeview is populated when the page comes back from the postback, so that is only possible if viewstate is being persisted right? (See the page_load code and you'll see that Call PopulateRootLevel(intTreeUserID) which populates the treeview, is not called on postbacks....hmmm.

Any ideas as to why the treeview maintains viewstate but not my ddls???? But though the tree is populated, I do have to explicitly select the node again and set the panel that the detailsview control is on to visible again too....

Here is the dynamically loaded control code:

[Code]....

And in the Detail.ascx page load I've got:

[Code]....

[Code]....

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State Management :: Viewstate Error After Refreshing Page With Dynamically Loaded Controls

Jan 14, 2011

I have a page that loads a usercontrol dynamically. Depended on the user's actions, this control may be unloaded in Page_PreRender and a different control may be loaded instead. I am attempting to use the solution outlined by Mark DotNet Evans in this post:
http://forums.asp.net/p/1491790/3814320.aspx

This all works great, except if the user clicks the refresh button in the browser just after the change of usercontrol. Then, I get an error

Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. ...

I assume the error is caused by the browser re-posting the request with the old viewstate that matched the control tree when the page was loaded, but no longer does. How can I prevent getting an error when the user reloads the page?

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Forms Data Controls :: Accessing The Dynamically Created Dropdown In The Datagridveiw?

Jul 24, 2010

i have the requirement that to set the 'Timetable' for school..

i need weekdays vertically and periodnames horizentally as headings in the gridveiw.. and with in the gridveiw the client can able get those many periods dynamically with in the dropdown....

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Web Forms :: Dynamically Loaded User Control Not Getting Selected Value?

Nov 5, 2010

I have created a user control that contains two asp calendar controls. I need to add this user control twice on the same asp page, let's say for Check in date and Check out date. Since the two are conflicting to each other when I add it twice statically, I now dynamically add them on button click so that each time only one control is loaded. The problem is, when I select a date on a calendar, it seems that the selection event is not happening at all. Of course, I am not getting any date.

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Security :: Prevent A Runtime Loaded Assembly From Accessing The Web.config File?

Jul 19, 2010

I have an asp.net 4.0 site. I have CAS turned on for legacy support. But in CAS, is there a way to prevent a runtime loaded assembly from accessing the web.config file? I don't see a permission set that denies access to configuration information.

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Web Forms :: Dynamically Loaded Usercontrol Doesn't Fire PostbackEvent?

Jun 21, 2010

I am trying to dynamically load query form as a user control and build a sql statement based on user selection. I have a dropdownbox for Tablename, FieldName, ConditionalOperators and Value Field. Once the user makes a choice and causes a postback I loose my QueryForm (UserControl) and the selection Changed event never gets fired. I tried reloading the QueryForm on Page Init, still no luck.

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Web Forms :: Group Events And Dynamically Loaded User Control?

Oct 26, 2010

My main file is messages.aspx and i am loading a UC names message_inbox.ascx dynamically as:

SiteUserControls_Message_MessageInbox InboxUC = Page.Load("message_inbox.ascx") as
SiteUserControls_Message_MessageInbox

Now in my user control ("message_inbox.ascx") i have a various events which i am combining in one group event :

public void ForwardLinkButton_OnClick(object sender, EventArgs e)

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Web Forms :: Setting Properties On A Dynamically Loaded Control As Template?

Jan 6, 2010

[Code]....

Once the template is loaded and cast back to the TabHeader class, it's null. How can I load that control, set the properties, and use it as the template? Or is the only way to go about doing this to create a custom class?

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Web Forms :: Handling Button Clickevent In Usercontrol That Is Being Loaded Dynamically?

Nov 2, 2010

I have ASPX page named ArtifactReporting.aspx where I have 3 linkbuttons. For each button I have 3 different UserControls to be loaded dynamically. So I have written for each click

UserControl uc = (UserControl)this.LoadControl("<ASCX page name>");
divArtifact.Controls.Add(uc);

Now in one of the ASCX page I have a server side button. When I click on the button, the content of the ascx is going off, which is correct, because the page post back is happening and in Page_Load I have not written anything that will load the ASCX page.

how to go about this? I need if I load an usercontrol dynamically, I should be let the users carryout operation that usercontrol.

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Web Forms :: Dynamically Loaded User Control Button Event Not Firing?

Mar 11, 2011

I have a aspx page, default.aspx, with an user control in it. Inside the user control (UC 1) there is a DataGrid. When the DataGrid is loading data with ItemDataBound, I need to dynamically load another user control (UC 2) for each row in the DataGrid. UC 2 has a Button ( BTN )with an eventhandler associated with it in code behind.

User control loading is fine, and the Button, BTN, is there. However, when I click the Button, the eventhandler is not reached, not firing, even though the page does postback. I googled for this issues, and I know the dynamically loaded user controls need to be loaded every time the page is postback. In my case, it needs to be loaded each time the datagrid is doing ItemDataBound. I did it and even hook up the eventhandler with button click event each time when the user control is dynamically loaded. I set EnableViewState to true on the Page and controls.

The following is part of the code from UC 1, AcctPaymentDetail is UC 2 in the code.

[Code]....

And the following is UC 2 the is being loaded:

[Code]....

[Code]....

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Web Forms :: Load JavaScript File Dynamically When User Control Is Loaded

Jun 17, 2013

I have a tab control on my page  and on click of tab  user control is loaded dynamically.I need to load the javascript file  of that user control dynamically. I don't want to add the reference of my js file on parent page.so in my .ascx page load event i added:

System.Web.UI.HtmlControls.HtmlGenericControl js = new System.Web.UI.HtmlControls.HtmlGenericControl("script");
js.Attributes["type"] = "text/javascript";
js.Attributes["src"] = "../../js/DatesJavaScript.js";
Page.Header.Controls.Add(js);
 
but it is not working.

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Accessing Controls Created Dynamically (c#)

Jun 5, 2010

In my code behind (c#) I dynamically created some RadioButtonLists with more RadioButtons in each of them. I put all controls to a specific Panel.What I need to know is how to access those controls later as they are not created in .aspx file (with drag and drop from toolbox)?

I tried this:

foreach (Control child in panel.Controls)
{
Response.Write("test1");
[code]....

"test1" and "test2" dont show up in my page. That means something is wrong with this logic.

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