How To Bind Events To Controls Inside A Loaded Template

Jan 7, 2010

I'm using a FormView with a dynamically loaded item template. Inside the template (an ascx file loaded through Page.LoadTemplate(...) ) there is a button and I need to invoke the click event on that button.

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My Requirement :

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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.

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The code is basically this:

[code]....

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I have user control that inherits a base control class and these user controls are loaded using the LoadControl method, I can't seem to figure out how to raise events from user controls to the page that are dynamically loaded this way. Here is the delegate and event in the base user control class.

public delegate void SomeChangeEventHandler(object sender
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Forms Data Controls :: Bind() Inside Templated User Control Inside InsertItemTemplate Does Not Bubble Values?

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I have a ObjectDataSource and a ListView referencing it.

I have created a Templated User Control (see:
http://msdn.microsoft.com/en-us/library/36574bf6.aspx) and placed it in the ListView's InsertItemTemplate
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See below:

[Code]......

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I use gridview and bind it from sesstion below is code below are code:

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[Code] ....

Here in grid view I wand add

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[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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I have a gridview to which I'm adding template fields programmatically. Each of the template fields have a textbox. I would like to make this text box have 2-way binding to a database column. see below code.

[Code]....

I'm calling the above class as follows

[Code]....

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[Code]....

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I have a Formview residing inside am Item Template of a Gridview. The formview is not populating, and I am pretty convinced that I am not passing the parameter properly from the Gridview to the Formview. I have listed the relevant code only, so that you can scan though it easierGridview tag:

[Code]....

Gridview's Datasource:

[Code]....

Formview's tag inside Gridview template field:

[Code]....

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[Code]....

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I've been reading up on the problems with dynamically created controls and how they have been solved. The posts I have come across are creating the controls in a panel or some other open place. I can't seem to get my checkbox to fire the event from inside a gridview. below is the code behind from inside the GridView PreRender event.

[Code]....

..And the Checked Event..
[Code]....

So after all this, nothing happens. I get the postback flash but my command inside the checked event doesn't fire.I tried putting the dynamic creation of the checkbox in Page Load with no effect.. I think because I can't place the checkbox inside the GridView under page load.

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Jun 4, 2010

I have a user control called ucTriStateButton. It raises an event when it is clicked, called TriStateButtonClicked. If I put this user control on a page, it works fine. Here is the declaration on the .aspx page:

[Code]....

When the button is clicked the method tsbTest_TriStateButtonClicked executes correctly.

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[Code]....

There is no way to hook the event handler to the control in Page_Load because I cannot get a reference to tsbMorning. So I did it in the RowDataBound event handler of the GridView, where I also do a bunch of other row-specific stuff. Although this builds and runs, the event is never actually subscribed to and so never gets fired.

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I have created a custom control that implements Templates (based on Panel controls) ... I can do a FindControl to locate imbedded controls. This allows me to get and set values in the imbedded controls, but I want to be able to reference the imbedded controls like they are properties of the associated panel. Here is a sample of how my custom control now works:

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What I want to do is:

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I am writing a custom control and implementing ITemplate in it. The code that I am using can be reviewed at the following link: http://msdn.microsoft.com/en-us/library/ms178657.aspx

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<asp:TemplateField>
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