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Subject:
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addhandler catch 22
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Posted By:
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roog
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Post Date:
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2/20/2006 8:37:42 AM
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Hi,
I have an (in advance) unknown number of dropdownlists in an arraylist. I add a handler like this:
AddHandler arraylist(i).SelectedIndexChanged, AddressOf SomeDropDownList_SelectedIndexChanged
Now I want to make the following event handler:
Private Sub SomeDropDownList_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
DoSomething()
End Sub
Which does not work, because I have to define which dropdown it handles (!!??)
handles a_Specific_dropdown.SelectedIndexChanged.
But if I have to define which dropdown this event handles, what use is it to generate dropdowns at runtime (based on a database query)? Can't I define just one event handler, and let it handle all (new and unknown untill runtime) dropdownlists? This one is driving me crazy for a long time now... could somebody please help me?
Roog
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Reply By:
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savan_thakkar
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Reply Date:
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2/20/2006 11:00:49 AM
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Hi Friend,Really interesting question.
I spent a lot of time on it.I made the code in C#.net as below.
I wrote this code in Page_Load event.If you try to write it in any other event like Button_Click...then it won't work.If I m correct,you can register an event in only page_Initialize & page_Load event.
int no;
no=5;//Any other number from database
DropDownList d;
string s;
for(int i=0;i<no;i++)
{
d=new DropDownList();
d.Items.Add(new ListItem("AA","A"));
d.Items.Add(new ListItem("BB","B"));
d.ID="d" + i.ToString();
d.AutoPostBack=true;
d.SelectedIndexChanged+=new EventHandler(d_SelectedIndexChanged);
p1.Controls.Add(d);
}
private void d_SelectedIndexChanged(object sender, EventArgs e)
{
Response.Write("Gone");
}
Give me your feedback as soon as possible
Savan
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Reply By:
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roog
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Reply Date:
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2/20/2006 12:01:00 PM
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Many thanks!!! It still does not work in page_load somehow... I just never tried to do it in Page_Init, assuming that it just didn't work. But in Page_Init it does work...
Thanks Savan!
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