Question

Custom control, Is this event accessible even though IntelliSense doesn't show it?

Asked by: Zoplax

I'm working with a custom web control which has the calDate_SelectionChanged event defined.

However, when I try to access this event in the .aspx page, I get this error:

     "Attribute "OnSelectionChanged" is not a valid attribute of element myCalendarControl."

And in my code-behind, IntelliSense doesn't register this event among the others listed for this control.

What must I change, if anything, in order to be able to capture and control this event from my code behind for this web control?

protected void calDate_SelectionChanged(object sender, System.EventArgs e)
{
	txtDate.Text = calDate.SelectedDate.ToShortDateString();
	calendarDiv.Visible=false;
	populate_YearDropdown();
	focusTargetClientId = txtDate.ClientID;
}
                                  
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Asked On
2008-09-04 at 14:11:59ID23704319
Tags

microsoft

,

visual studio

,

2005

,

.net 2.0 framework

,

C#

Topics

Programming for ASP.NET

,

.NET Framework 2.x

,

Microsoft Visual C#.Net

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Comments
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Answers

 

by: ChloesDadPosted on 2008-09-04 at 14:43:47ID: 22393021

Have you written a custom event called selectionChanged, or are you trying to write a customevent called selectionchanged

 

by: ZoplaxPosted on 2008-09-04 at 15:14:03ID: 22393277

ChloesDad:  The event "calDate_SelectionChanged" is what the control has a definition for; I haven't gotten to a point where I can try to even create a usage of the control in my own code because for whatever reason this event isn't visible to me in my code-behind.

I mean I can instantiate the myCalendarControl object, and I can access its properties, methods, and other events, but this particular event for whatever reason is unavailable in the IntelliSense list, and I'm not sure why.  Is it simply because of the protection level (protected)?  Or something I may not be seeing?

I didn't write this particular control nor its events, I'm just trying to get access to this particular one.  In use, when I do select a date from the calendar (it's basically like a datepicker control), a postback occurs and the child TextBox inside this control is updated with the selected date.  I need to tap into that event when it occurs so I can execute some database code against the selection.

 

by: ChloesDadPosted on 2008-09-04 at 15:44:59ID: 22393585

Are you using the built in date control in .net or a third party one?

 

by: ZoplaxPosted on 2008-09-04 at 16:51:49ID: 22394011

It's a 3rd-party control created by some outsourcers, for whatever reason they opted not to just use various datepicker controls out there which expose this event plainly, and rolled their own from these separate components.  

It appears to consist of a Calendar object (System.Web.UI.WebControls.Calendar), a TextBox (for the mm/dd/yyyy date text), and an ImageButton to display the Calendar, as well as a couple of dropdowns for month and year and some linkbuttons to scroll between months (it displays a single calendar month at a time).

I'd be OK with using it if I could just find out how to access and respond to the SelectionChanged event, but if a straightforward solution doesn't exist, I may just opt to replace this control with another which exposes this event directly.

 

by: ChloesDadPosted on 2008-09-05 at 00:22:04ID: 22396030

It sounds like they haven't written a selectionchanged event, maybe they have called it something else. Can you contact them to find out, or alternatively post the control here so that I can look at it

 

by: ZoplaxPosted on 2008-09-17 at 11:58:05ID: 22502363

I ended up using the free GMDatePicker control, which exposes events related to changed dates in a manner more readily than the control I'd been working with.

20120131-EE-VQP-002

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