Thanks for your further followup Richard,
Glad that you've got your control working now. Developing custom control is
really a hard work especially when the structure become very complex.
Anyway, if there're any thing we can help later, please feel free to post
here.
Good luck!
Steven Cheng
Microsoft Online Support
Get Secure!
www.microsoft.com/security
(This posting is provided "AS IS", with no warranties, and confers no
rights.)
--------------------
| Message-ID: <
[email protected]>
| From: RichB <
[email protected]>
| Subject: RE: user control - image button only works on second select
| References: <
[email protected]>
| MIME-Version: 1.0
| Content-Transfer-Encoding: 8bit
| Content-Type: text/plain; charset=iso-8859-1; format=flowed
| X-Newsreader: JetBrains Omea Reader 671.6
| Newsgroups: microsoft.public.dotnet.framework.aspnet.webcontrols
| Date: Thu, 22 Sep 2005 03:42:49 -0700
| NNTP-Posting-Host: host86-132-141-218.range86-132.btcentralplus.com
86.132.141.218
| Lines: 1
| Path: TK2MSFTNGXA01.phx.gbl!TK2MSFTNGP08.phx.gbl!tk2msftngp13.phx.gbl
| Xref: TK2MSFTNGXA01.phx.gbl
microsoft.public.dotnet.framework.aspnet.webcontrols:10980
| X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet.webcontrols
|
| Steven, Thanks....
|
| I've managed to sort things out by changing my CreateTree() method as
follows:
|
|
| private void CreateTree()
| {
| tree = Page.LoadControl("DynamicTree.ascx") as DynamicTree;
|
| Panel1.Controls.Clear();
| tree.ID = "puc_1";
|
| tree.people = people;
| tree.familytree = familytree;
| tree.multiple = zoom;
| this.Panel1.Controls.Add(tree);
| }
|
| I am still not quite sure why the behaviour exists, however it would
appear
| the ID is critical for the page to find the event to fire on postback.
| This doesn't however really explain why the first set of controls added
work
| OK before and after the second set were added but I am not too concerned
| as all is working now.
|
| Thanks for your assistance.
| Richard
|
|
| Hello Steven Cheng[MSFT],
|
| > Hi Richard,
| >
| > As for the Control's ID, it's very important for our dynanmically
| > created controls since for each control when adding into a certain
| > NamingContainer, the runtime will generate a page wide idenitifier for
| > it according to that control's ID and its naming container's ID. Then,
| > this ID will be used to identify the control in several processing,
| > include VIEWSTATE mapping , postback event mapping (if exist). So
| > when we add dynami control, we must assign a unique control ID for
| > each control instance. Also, this ID must be consistent in each page's
| > request, otherwaise, we'll get many unexpected problems on Control's
| > displaying or postback event handling.
| >
| > Here is a good article discussing on the ASP.NET viewstate in page
| > model:
| >
| > #Understanding ASP.NET View State
| >
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnasp
| > p/html /viewstate.asp
| >
| > Thanks,
| >
| > Steven Cheng
| > Microsoft Online Support
| > Get Secure!
www.microsoft.com/security
| > (This posting is provided "AS IS", with no warranties, and confers no
| > rights.)
| > --------------------
| > | Thread-Topic: user control - image button only works on second
| > select
| > | thread-index: AcW+3nbKUiwhLRrbSFecodvqzTNnag==
| > | X-WBNR-Posting-Host: 86.132.141.218
| > | From: "=?Utf-8?B?cmljaEI=?=" <
[email protected]>
| > | References: <
[email protected]>
| > <
[email protected]>
| > <
[email protected]>
| > <#
[email protected]>
| > <
[email protected]>
| > | Subject: RE: user control - image button only works on second select
| > | Date: Wed, 21 Sep 2005 11:58:33 -0700
| > | Lines: 330
| > | Message-ID: <
[email protected]>
| > | MIME-Version: 1.0
| > | Content-Type: text/plain;
| > | charset="Utf-8"
| > | Content-Transfer-Encoding: 8bit
| > | X-Newsreader: Microsoft CDO for Windows 2000
| > | Content-Class: urn:content-classes:message
| > | Importance: normal
| > | Priority: normal
| > | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.0
| > | Newsgroups: microsoft.public.dotnet.framework.aspnet.webcontrols
| > | NNTP-Posting-Host: TK2MSFTNGXA03.phx.gbl 10.40.2.250
| > | Path: TK2MSFTNGXA01.phx.gbl!TK2MSFTNGXA03.phx.gbl
| > | Xref: TK2MSFTNGXA01.phx.gbl
| > microsoft.public.dotnet.framework.aspnet.webcontrols:10952
| > | X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet.webcontrols
| > |
| > | I have now modified your example and recreated my problem (and found
| > a
| > little
| > | extra in your code which I had missed). Can you explain for me what
| > is
| > | happening...
| > |
| > | Firstly I have added multiple listitems to the dropdown (Show 1,
| > Show2,
| > | Show3). I then ran the app and selected Show 1 and then Show2. On
| > selecting
| > | Show2 I get the error:
| > | 'Multiple controls with the same ID 'puc_1' were found. FindControl
| > requires
| > | that controls have unique IDs. ' hence noticing your line setting
| > the
| > uc.ID
| > | (Sorry I missed this before).
| > |
| > | I then commented out this code and this resulted in a second set of
| > buttons
| > | appearing when I select show2 (after initially selecting show1)
| > which
| > | disappear when I select one of them, leaving the original set of
| > buttons
| > | which work OK.
| > |
| > | Can you explain whether setting the ID is necessary and also what is
| > | happening when I have removed it and how I might solve it in the
| > example....
| > | I can then try and apply this to my own app.
| > |
| > | Thanks, Richard
| > |
| > |
| > |
| > |
| > |
| > |
| > |
| > | "richB" wrote:
| > |
| > | > Steven,
| > | >
| > | > Thanks again, hopefully the following will answer your questions:
| > | >
| > | > 1. test page and uc was fine, although mine is more complex with
| > several
| > | > options in the drop down: option 0 performs hide, option 1 shows
| > button
| > 1,
| > | > option 2 shows button 2, options 3 showns button 1 & 3 etc...I
| > shall
| > try to
| > | > adjust your example and see if I can recreate my problem with
| > this.
| > | >
| > | > 2. I am pretty sure that I am loading the control correctly using
| > my
| > | > CreateTree() method.
| > | >
| > | > 3. The user control also has labels placed within the panel and
| > images
| > | > generated to show the links between the different labels. ( I have
| > tried
| > | > commenting these out and the problem still exists).
| > | >
| > | > 4. The image buttons are all dynamically loaded as per the code
| > after
| > point
| > | > 2 in my last post.
| > | >
| > | > 5. the main page does contain two other linkbutton controls which
| > change the
| > | > scaling of the controls within the user control (except for the
| > image
| > | > buttons) as follws:
| > | >
| > | > private void LinkButton1_Click(object sender, System.EventArgs e)
| > | > {
| > | > zoom = (int)(zoom * 1.25);
| > | > Trace.Write("zoom = " + zoom.ToString() );
| > | > this.Panel1.Controls.Remove(tree);
| > | > this.Session.Add("zoom",zoom);
| > | > CreateTree();
| > | >
| > | > }
| > | >
| > | > Again I have tried commenting out all of the code related to these
| > buttons
| > | > and this makes no difference to my problem. It is however the case
| > that
| > if
| > | > the zoom is selected the image buttons do not work on first click.
| > | >
| > | > As I say I shall try to build a simple example which I can attach
| > to
| > the
| > | > post which demonstrates the same behaviour unless there is
| > anything
| > which you
| > | > can think of which is likely to cause me these problems.
| > | >
| > | > Thanks, Richard
| > | >
| > | >
| > | >
| > | > "Steven Cheng[MSFT]" wrote:
| > | >
| > | > > Hi Richard,
| > | > >
| > | > > Thanks for your detailed response.
| > | > > So does the test page and usercontrol I sent you works as you
| > expected?
| > | > > Also, from your further description, I have some question on the
| > user
| > | > > control, as for the main page and dropdownlist, I don't think
| > there
| > will
| > | > > have any particular problems in them as long as we all Load the
| > Usercontrol
| > | > > correctly each time in Page's Load or Init event. Something I
| > still
| > not
| > | > > sure is about the sub controls in your Usercontrol(which is
| > dynamically
| > | > > loaded), are the controls in the usercontrol (imagebuttons )
| > also
| > | > > dynamically created and added ? Also, seems you mentioned that
| > there're
| > | > > also some other controls (buttons) in addition to the
| > DropDownlist on
| > the
| > | > > main page?
| > | > > If so, the problem will be abit more complex than I have
| > expected.
| > I'll
| > | > > need some further tests.
| > | > >
| > | > > Thanks,
| > | > >
| > | > > Steven Cheng
| > | > > Microsoft Online Support
| > | > >
| > | > > Get Secure!
www.microsoft.com/security
| > | > > (This posting is provided "AS IS", with no warranties, and
| > confers no
| > | > > rights.)
| > | > >
| > | > >
| > | > >
| > | > > --------------------
| > | > > | Thread-Topic: user control - image button only works on second
| > select
| > | > > | thread-index: AcW+GdakPHhJiWoOTDCOWHuZhfpqPA==
| > | > > | X-WBNR-Posting-Host: 86.132.141.218
| > | > > | From: "=?Utf-8?B?cmljaEI=?=" <
[email protected]>
| > | > > | References:
| > <
[email protected]>
| > | > > <
[email protected]>
| > | > > | Subject: RE: user control - image button only works on second
| > select
| > | > > | Date: Tue, 20 Sep 2005 12:31:03 -0700
| > | > > | Lines: 240
| > | > > | Message-ID:
| > <
[email protected]>
| > | > > | MIME-Version: 1.0
| > | > > | Content-Type: text/plain;
| > | > > | charset="Utf-8"
| > | > > | Content-Transfer-Encoding: 8bit
| > | > > | X-Newsreader: Microsoft CDO for Windows 2000
| > | > > | Content-Class: urn:content-classes:message
| > | > > | Importance: normal
| > | > > | Priority: normal
| > | > > | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.0
| > | > > | Newsgroups:
| > microsoft.public.dotnet.framework.aspnet.webcontrols
| > | > > | NNTP-Posting-Host: TK2MSFTNGXA03.phx.gbl 10.40.2.250
| > | > > | Path:
| > TK2MSFTNGXA01.phx.gbl!TK2MSFTNGXA02.phx.gbl!TK2MSFTNGXA03.phx.gbl
| > | > > | Xref: TK2MSFTNGXA01.phx.gbl
| > | > > microsoft.public.dotnet.framework.aspnet.webcontrols:10935
| > | > > | X-Tomcat-NG:
| > microsoft.public.dotnet.framework.aspnet.webcontrols
| > | > > |
| > | > > | Thanks Steven, I have had a look through the articles which
| > you
| > have
| > | > > | referred, and particularly through your example and compared
| > this
| > to my
| > | > > own
| > | > > | code. I have found no fundamental differences. However the
| > following
| > | > > pieces
| > | > > | are different:
| > | > > |
| > | > > | 1. I am using Page.Session to maintain details of the
| > information
| > in
| > | > > order
| > | > > | to recreate the user control. With the CreateTree() method
| > used
| > when I
| > | > > select
| > | > > | from the dropdown (on first and subsequent occasions):
| > | > > |
| > | > > | private void DropDownList1_SelectedIndexChanged(object sender,
| > | > > | System.EventArgs e)
| > | > > | {
| > | > > | this.Panel1.Controls.Clear();
| > | > > | this.Session.Clear();
| > | > > |
| > | > > | if (this.DropDownList1.SelectedValue != "0")
| > | > > | {
| > | > > | int personId =
| > Int32.Parse(this.DropDownList1.SelectedValue);
| > | > > |
| > | > > | int [] parent = GetData.GetParents(personId);
| > | > > |
| > | > > | familytree = new Tree(parent[0]== 0 ? personId :
| > parent[0]);
| > | > > |
| > | > > | people = familytree.GetTreePeople();
| > | > > | this.Session.Add("people",people);
| > | > > | this.Session.Add("zoom",zoom);
| > | > > | this.CreateTree();
| > | > > | this.Panel1.Visible = true;
| > | > > | }
| > | > > | else
| > | > > | {
| > | > > | this.Panel1.Visible = false;
| > | > > | }
| > | > > |
| > | > > |
| > | > > | private void CreateTree()
| > | > > | {
| > | > > | //original code
| > | > > | /*tree = this.LoadControl("DynamicTree.ascx");
| > | > > | ((DynamicTree)tree).people= people;
| > | > > | ((DynamicTree)tree).familytree = familytree;
| > | > > | ((DynamicTree)tree).multiple = zoom;
| > | > > | //tree.EnableViewState = true;
| > | > > | this.Panel1.Controls.Add(tree);*/
| > | > > |
| > | > > | //After post to MSDN
| > | > > | tree = Page.LoadControl("DynamicTree.ascx") as DynamicTree;
| > | > > | tree.people = people;
| > | > > | tree.familytree = familytree;
| > | > > | tree.multiple = zoom;
| > | > > | this.Panel1.Controls.Add(tree);
| > | > > |
| > | > > |
| > | > > | }
| > | > > | 2. I have multiple selections of people within my drop down.
| > Each
| > person
| > | > > has
| > | > > | a number of related people all of which are used to build a
| > tree of
| > | > > | relationships within the user control. Each related person has
| > an
| > | > > information
| > | > > | button which is used to pop-up the window. Page load contains
| > a
| > foreach
| > | > > loop
| > | > > | which creates an ImageButton for each person:
| > | > > |
| > | > > | ImageButton informationButton = new ImageButton();
| > | > > | informationButton.Style["POSITION"] = "absolute";
| > | > > | informationButton.Style["LEFT"] = (int)boxX-15+"px";
| > | > > | informationButton.Style["TOP"] = (int)boxY+"px";
| > | > > | informationButton.ImageUrl = "info.gif";
| > | > > | informationButton.ID = "Info"+ pers.id.ToString();
| > | > > | informationButton.Click += new
| > | > > |
| > System.Web.UI.ImageClickEventHandler(this.informationButton_Click);
| > | > > | Trace.Warn(informationButton.ID.ToString()+ "event handler
| > added");
| > | > > | informationButton.ToolTip = "information";
| > | > > | Panel1.Controls.Add(informationButton);
| > | > > |
| > | > > | private void informationButton_Click(object sender,
| > | > > | System.Web.UI.ImageClickEventArgs e)
| > | > > | {
| > | > > | Trace.Warn("sender: "+((ImageButton)sender).ID.ToString());
| > | > > |
| > | > > |
| > | > > | string sUrl =
| > | > > "PersonInformation.aspx?button="+((ImageButton)sender).ID;
| > | > > |
| > | > > | string sScript = "<script language =javascript> ";
| > | > > |
| > | > > | sScript += "window.open('" + sUrl +
| > | > > |
| > | > >
| > "',null,'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resiz
| > able=0
| > | > > ,width=800,height=600,left=100,top=100');";
| > | > > |
| > | > > | sScript += "</script> ";
| > | > > |
| > | > > | Page.RegisterStartupScript("newpage",sScript);
| > | > > |
| > | > > | }
| > | > > |
| > | > > | I think that this is all the relevant code, is there any
| > reason
| > which
| > | > > either
| > | > > | of these two differences would cause the results that I have
| > described.
| > | > > I.e.
| > | > > | the image buttons working on first selecting a person form the
| > drop
| > down,
| > | > > but
| > | > > | only working on selecting the button twice. (Interestingly I
| > have
| > just
| > | > > | discovered that if I select the default option â�index 0 ?
| > | > > select
| > | > > | another dropdown item then the button works on first press)
| > | > > |
| > | > > | Any further help greatly appreciated.
| > | > > |
| > | > > | Thanks,
| > | > > | Richard.
| > | > > |
| > | > > |
| > | > > | "Steven Cheng[MSFT]" wrote:
| > | > > |
| > | > > | > Hi Richard,
| > | > > | >
| > | > > | > Welcome to ASPNET newsgroup.
| > | > > | > Regarding on the problem in creating dynamic webuser
| > control,
| > here are
| > | > > some
| > | > > | > of my understanding and suggestions:
| > | > > | >
| > | > > | > In the ASP.NET webform page model, all the controls are
| > created
| > in each
| > | > > | > page request, not only the initial one, but also all the
| > sequential
| > | > > post
| > | > > | > back requests. Also, for dynamic created webcontrols, we
| > need to
| > add
| > | > > them
| > | > > | > into the parent (container) control's child collection in
| > each
| > request,
| > | > > not
| > | > > | > only in a certain postback event so as to make sure they'll
| > appear in
| > | > > the
| > | > > | > page correctly. So generally, Page's Init or Load event is
| > the
| > most
| > | > > proper
| > | > > | > place for creating dynamic web server/user controls. Here
| > are
| > some tech
| > | > > | > articles on creating dynamic webcontrols;
| > | > > | >
| > | > > | > #HOW TO: Dynamically Create Controls in ASP.NET by Using
| > Visual
| > C# .NET
| > | > > | >
| >
http://support.microsoft.com/default.aspx?scid=kb;en-us;317794
| > | > > | >
| > | > > | > #Creating Dynamic Data Entry User Interfaces
| > | > > | >
| > | > >
| >
http://msdn.microsoft.com/library/en-us/dnaspp/html/dynamicui.asp?fram
| > e=true
| > | > > | >
| > | > > | > So for your scenario, we'd suggest you put the dynamic web
| > user
| > | > > | > control(ascx) 's creating code in a function and call this
| > function in
| > | > > | > Page's Init or Load event according to a certain
| > variable's
| > value(
| > | > > you
| > | > > | > can consider using ViewState or a <input type="hidden" ...>
| > element to
| > | > > | > store this value). Also, to make it eaiser, I've made a
| > simple
| > demo
| > | > > page
| > | > > | > which dynamically display a UserControl according to a
| > DropDownlist's
| > | > > | > selected value on the page . I've attached the code in the
| > attachement
| > | > > of
| > | > > | > this message, you can get it through OE. (please let me know
| > if
| > you
| > | > > have
| > | > > | > any problem accessing them).
| > | > > | >
| > | > > | > In addition ,here are some other good articles on
| > Usercontrol and
| > | > > asp.net
| > | > > | > page model, event lifecycle:
| > | > > | >
| > | > > | >
| > | > > | > #Events in ASP.NET Server Controls
| > | > > | >
| > | > >
| >
http://msdn.microsoft.com/library/en-us/cpguide/html/cpconeventsinwebf
| > ormsco
| > | > > | > ntrols.asp?frame=true
| > | > > | >
| > | > > | > #Control Execution Lifecycle
| > | > > | >
| > | > >
| >
http://msdn.microsoft.com/library/en-us/cpguide/html/cpconControlExecu
| > tionLi
| > | > > | > fecycle.asp?frame=true
| > | > > | >
| > | > > | > #An Extensive Examination of User Controls
| > | > > | >
| > | > >
| >
http://msdn.microsoft.com/library/en-us/dnaspp/html/usercontrols.asp?f
| > rame=t
| > | > > | > rue
| > | > > | >
| > | > > | > Hope helps. Thanks,
| > | > > | >
| > | > > | > Steven Cheng
| > | > > | > Microsoft Online Support
| > | > > | >
| > | > > | > Get Secure!
www.microsoft.com/security
| > | > > | > (This posting is provided "AS IS", with no warranties, and
| > confers no
| > | > > | > rights.)
| > | > > | >
| > | > > | >
| > | > > | >
| > | > > | >
| > | > > | >
| > | > > | >
| > | > > | >
| > | > > | > --------------------
| > | > > | > | Thread-Topic: user control - image button only works on
| > second
| > select
| > |
|
|
