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In ASP.NET2, How do I capture a button click event of the parent page which contains my user control.

Posted on 2011-02-21
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Last Modified: 2012-06-27
Hi,

I have an ASP.NET2 page which contains a user control. This container page has some generic buttons on it like "Next", "Previous" etc. How do I capture when these parent buttons have been clicked in my User Control Code Behind. I need to do this since I need to invoke some final processing before the User Control disappears to be replaced by another.

A code example would be really handy.

Thanks,

Sam
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Question by:SamJolly
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LVL 9

Accepted Solution

by:
xav056 earned 450 total points
ID: 34948192
in the page_init
try this
Request.Form["__EVENTTARGET"]  that should give you the id of the control that caused the postbac if it is anajax control
alternatively if it is a regular asp button you do
Request.Form["TheIDOfYourButton"]  is that is not null it means that control caused the postback
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Author Comment

by:SamJolly
ID: 34948256
I assume you are talking about the page_init in the container page. I would really like capture the event in the user control preferable using the "Handles" feature so that I can link an event handler in my User Control to the event that happened in the parent.

The parent event looks like this:

    Protected Sub btnPrev_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnPrev.Click

In the User Control code I would like to get some code to run then have this parent code run as normal.
Something like this in the User Control:

Protected Sub btnPrev_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Parent.btnPrev.Click
..... Do UserControl Final Save code
 ....Now run normal Parent.btnPrev.Click code.

Thoughts???

Thanks,

Sam


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LVL 9

Expert Comment

by:xav056
ID: 34948461
yes,
how about you expose a public methods that you can  call from the page_init
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LVL 20

Assisted Solution

by:informaniac
informaniac earned 50 total points
ID: 34949013
Did u take a look @delegates. I'm not sure of this, coz the other way arnd works using delegates.
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Author Comment

by:SamJolly
ID: 34950314
Thanks all for comments.

I have just tried using the Page_Init method, in the user control, with the following code:

 Dim ctrlname As String = Page.Request.Params.Get("__EVENTTARGET")

However "ctrlName" always returns "" when I click on the Parent's buttons.

Thoughts?

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Author Comment

by:SamJolly
ID: 34950409
OK, I have managed to get something to work:

        ctrlname = Request.Form("ctl00$MainPanelContent$btnNext")

This checks the "name" attribute which returns "Next" if clicked and therefore I could use this. However it does not seem to be a very ASP.NET way of doing things. I would love to know the correct ASP.NET way of doing this. I still think there must be a correct way of trapping Parent Page events, ie parent.btnNext.clicked,  within the User Control. So what is the recommended way to do this?

Thanks,

Sam
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LVL 9

Expert Comment

by:xav056
ID: 34950959
I think the control  btnNext.ClientId will return ctl00$MainPanelContent$btnNext
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Author Closing Comment

by:SamJolly
ID: 35076092
thks. Apologies for the delay in closing
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