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olay80
Yak Posting Veteran
62 Posts |
 Posted - 2005-06-08 : 10:26:09
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| hey guys,i'm dynamically creating listboxes and assigning events to each.lb.Click += new EventHandler(change);the function change is invoked upon the click on one of those listboxes. what i need is how to know what listbox was clicked, knowing that i create the listboxes as follows:for (int i = 0; i < 4; i++){ ListBox lb = new ListBox(); lb.Location = new System.Drawing.Point(j,20); lb.Size = new System.Drawing.Size(75,75); lb.Name = lbNames[i]; lb.Click += new EventHandler(change); this.groupBox1.Controls.Add(lb);}this.Controls.Add(this.groupBox1);i need to let know the function change which listbox was clicked.thanx,Oliver |
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jhermiz
3564 Posts |
Posted - 2005-06-08 : 10:49:38
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lb.name ?
Keeping the web experience alive -- [url]http://www.web-impulse.com[/url]Imperfection living for perfection -- [url]http://jhermiz.blogspot.com/[/url] |
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jsmith8858
Dr. Cross Join
7423 Posts |
Posted - 2005-06-08 : 11:43:00
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| Make sure your event handler has the correct signature; most likely it is something like this:private void OnChange(object sender, EventArgs e)(when you write the code to attach the event handler, the UI should give you the option to press TAB to build this for you)If the function has the correct declaration, then you can cast the "sender" variable to a ListBox and get whatever property you need from there.Here's an example:private void Page_Load(object sender, System.EventArgs e) { // Put user code to initialize the page here for (int i=0; i<4;i++) { Button b = new Button (); b.Text = "Button " + i.ToString(); b.ID = "Button" + i.ToString(); b.Click +=new EventHandler(OnClick); Page.FindControl("Form1").Controls.Add(b); Page.FindControl("Form1").Controls.Add (new LiteralControl("<BR>")); } } private void OnClick(object sender, EventArgs e) { Response.Write("The button clicked was : " +( (Button) sender).ID + "<BR>"); }- Jeff |
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olay80
Yak Posting Veteran
62 Posts |
Posted - 2005-06-09 : 01:31:10
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| thanx alot Jeff. |
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byrmol
Shed Building SQL Farmer
1591 Posts |
Posted - 2005-06-09 : 01:47:32
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| I like to assign a single instance of the handler..EventHandler changehandler = new EventHandler(OnClick);for {b.Click += changehandler;}DavidMA front-end is something that tries to violate a back-end. |
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olay80
Yak Posting Veteran
62 Posts |
Posted - 2005-06-09 : 04:18:01
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| hey guys,what if i want to see the sender of the next event?meaning:i have generated 5 dynamic listboxes each attached to an event i want to know when i click on the second listbox for example to be able to see the sender object of the third listbox???thanx,Oliver |
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jsmith8858
Dr. Cross Join
7423 Posts |
Posted - 2005-06-09 : 07:49:49
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quote:
Originally posted by byrmol
I like to assign a single instance of the handler..EventHandler changehandler = new EventHandler(OnClick);for {b.Click += changehandler;}DavidMA front-end is something that tries to violate a back-end.
That would be much better; great call ...Oliver -- That kind of makes no sense what you are asking ... you can't look into the future to predict which control a user is going to click! The best you can do is store a reference to the first control clicked in a member variable, and then in the second event you now have references to both controls and can do what you want.I get the feeling, however, that you are making things more complicated than they need to be ... if you can give us a specific example of what you are trying to do that would be helpful.- Jeff |
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Events with dynamic listbox creation.