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aspx thread: Need help on landling templates in a WebControl.
Message #1 by "Thomas Tomiczek" <thona@g...> on Fri, 6 Oct 2000 11:36:39 +0200
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> Hello,
>
> I have a very simpla WebControl (actually written by Scott Guthrie [
> :-) ] that I need to extend.
>
> Its code is:
> -->
> public class Fragment : Control {
>
> private ITemplate content = null;
>
> public ITemplate Content {
>
> get {
> return content;
> }
> set {
> content = value;
> }
> }
> }
> <--
>
> Now, my problem is that when I use this control such as in
> -->
> <DkWeb:Fragment id=3D"ContentLeftTop">
> <template name=3D"Content">
> <asp:TextBox id=3D"ctlSurname" runat=3D"server"
> Colums=3D"20" MaxLength=3D"20" TextMode=3D"SingleLine"
width=3D"100%"/>
> </template>
> </DkWeb:Fragment>
> <--
> I can not access the Textbox by its Id. Normally there is - on the
> page - a variable generated whose name is the ID. In this case, the
> Name is somehow composed by the name of the page plus another verb
> plus a number - which is making it impossible to access the control,
> because the number can change when the template is edited.
>
> On the bad side: all the relevant parts of the documentation seem
> "still to come".
>
> Now, anyone has any knowledge on how I can take handle this? What I
> actually want is that the above textbox is accessible from Script by
> its id as would normally be the case.
>
> Scott, if you read this - this is a similar request to the email I
> sent to you yesterday, just that the email was longer and contained
> the complete generated source for a page.
>
> Any help is greatly appreciated.
>
> Thomas Tomiczek
Message #2 by Rob Howard <rhoward@m...> on Fri, 6 Oct 2000 07:35:51 -0700
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Hi Thomas,
I believe you need to add some more code to the control to render the
textbox within DkWeb:Fragment using templates. I didn't have time to write
an example, but take a look at the ASP+ quickstarts "Authoring Custom
Contorls" section (towards the bottom of the page).
The TextBox control is created as child control of the parent. Without
templates (when it's only a simple composite control), you can access the
TextBox control as follows:
void Page_Load(){
TextBox ctlSurname = (TextBox) ContentLeftTop.FindControl("ctlSurname");
ctlSurname.Text = "Hello from ctlSurname";
}
another problem, you need to mark DkWeb:Framgment with a runat=server
property:
<DkWeb:Fragment id="ContentLeftTop" runat=server>
Hope that helps.
Thanks,
Rob
office xxx.xxx.xxxx | cell xxx.xxx.xxxx | fax xxx.xxx.xxxx (attn: rhoward)
-----Original Message-----
From: Thomas Tomiczek [mailto:thona@g...]
Sent: Friday, October 06, 2000 2:37 AM
To: ASP+
Subject: [aspx] Need help on landling templates in a WebControl.
Hello,
I have a very simpla WebControl (actually written by Scott Guthrie [ :-) ]
that I need to extend.
Its code is:
-->
public class Fragment : Control {
private ITemplate content = null;
public ITemplate Content {
get {
return content;
}
set {
content = value;
}
}
}
<--
Now, my problem is that when I use this control such as in
-->
<DkWeb:Fragment id="ContentLeftTop">
<template name="Content">
<asp:TextBox id="ctlSurname" runat="server"
Colums="20" MaxLength="20" TextMode="SingleLine" width="100%"/>
</template>
</DkWeb:Fragment>
<--
I can not access the Textbox by its Id. Normally there is - on the page - a
variable generated whose name is the ID. In this case, the Name is somehow
composed by the name of the page plus another verb plus a number - which is
making it impossible to access the control, because the number can change
when the template is edited.
On the bad side: all the relevant parts of the documentation seem "still to
come".
Now, anyone has any knowledge on how I can take handle this? What I actually
want is that the above textbox is accessible from Script by its id as would
normally be the case.
Scott, if you read this - this is a similar request to the email I sent to
you yesterday, just that the email was longer and contained the complete
generated source for a page.
Any help is greatly appreciated.
Thomas Tomiczek
---
Message #3 by "Thomas Tomiczek" <thona@g...> on Fri, 6 Oct 2000 17:25:17 +0200
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Content-Transfer-Encoding: quoted-printable
Hello Rob,
well, its actually a little bit more complicated because this code was
written by Scott Guthrie :-).
The Fragment is included in something called a FragmentHolder that
actually looks like this:
-->
using System;
using System.Collections;
using System.Web;
using System.Web.UI;
namespace Daikiri.Web {
[ ControlBuilderAttribute(typeof(FragmentBuilder)) ]
public class FragmentHolder : Control, INamingContainer {
private String basedOn =3D null;
public String BasedOn {
get {
return basedOn;
}
set {
basedOn =3D value;
}
}
public ITemplate LoadFragmentTemplate(System.Web.UI.Page page,
String fragmentName) {
// Attempt to locate requested fragment from children
collection
// BugBug: The below walk code is inefficient. Instead, we
should
// just use Control.FindControl to locate the appropriate
control.
// This does a hashtable lookup on the current naming
container.
// However, in the PDC bits there was a bug which prevented
// Control.FindControl from working if the controls in
quetion
// were unsited. Need to modify below code in Beta1.
foreach (Control child in this.Controls) {
if ((child.ID =3D=3D fragmentName) && (child is
Fragment)) {
return ((Fragment) child).Content;
}
}
// If the fragment is not in the children collection,
attempt to
// resolve it from a parent page to see if it is inherited
if (this.BasedOn !=3D null) {
Control basepage =3D page.LoadControl(basedOn);
if (basepage =3D=3D null) {
throw new Exception("Couldn't load base page: " +
basedOn);
}
foreach (Control child in basepage.Controls) {
if (child is FragmentHolder) {
return ((FragmentHolder)
child).LoadFragmentTemplate(page, fragmentName);
}
}
}
throw new Exception("Cannot find " + fragmentName + "
fragment!");
}
protected override void CreateChildControls() {
// Load "main" fragment of page -- this is the entrypoint
// for the page and controls overall page rendering
ITemplate maintemplate =3D LoadFragmentTemplate(Page,
"main");
// Instantiate "main" fragment and insert it into the page
tree
maintemplate.Initialize(this);
}
}
// The below custom ControlBuilder implementation enables page
developers to
// drop <dell:fragment> sections within a <dell:fragmentholder>
section
// without having to have "runat=3Dserver" attributes on them.
public class FragmentBuilder : ControlBuilder {
public override Type GetChildControlType(string tagName,
IDictionary attribs) {
if (tagName.ToLower().EndsWith("fragment")) {
return typeof(Fragment);
}
return null;
}
}
}
<--
If you look at the FragmentBuilder - it takes care that there is no need
for runat=3D"server".
The problem is that the names the controls get in the generated code are
somehow funny. something like PAGENAME_Ctrl22. Might bee (its all
undocumented) that I need to extend the FragmentBuilder, but how?
Thomas Tomiczek
-----Original Message-----
From: Rob Howard [mailto:rhoward@m...]
Sent: Freitag, 6. Oktober 2000 16:36
To: ASP+
Subject: [aspx] RE: Need help on landling templates in a WebControl.
Hi Thomas,
I believe you need to add some more code to the control to render the
textbox within DkWeb:Fragment using templates. I didn't have time to
write an example, but take a look at the ASP+ quickstarts "Authoring
Custom Contorls" section (towards the bottom of the page).
The TextBox control is created as child control of the parent. Without
templates (when it's only a simple composite control), you can access
the TextBox control as follows:
void Page_Load(){
TextBox ctlSurname =3D (TextBox)
ContentLeftTop.FindControl("ctlSurname");
ctlSurname.Text =3D "Hello from ctlSurname";
}
another problem, you need to mark DkWeb:Framgment with a runat=3Dserver
property:
<DkWeb:Fragment id=3D"ContentLeftTop" runat=3Dserver>
Hope that helps.
Thanks,
Rob
office xxx.xxx.xxxx | cell xxx.xxx.xxxx | fax xxx.xxx.xxxx (attn:
rhoward)
-----Original Message-----
From: Thomas Tomiczek [mailto:thona@g...]
Sent: Friday, October 06, 2000 2:37 AM
To: ASP+
Subject: [aspx] Need help on landling templates in a WebControl.
Hello,
I have a very simpla WebControl (actually written by Scott Guthrie [ :-)
] that I need to extend.
Its code is:
-->
public class Fragment : Control {
private ITemplate content =3D null;
public ITemplate Content {
get {
return content;
}
set {
content =3D value;
}
}
}
<--
Now, my problem is that when I use this control such as in
-->
<DkWeb:Fragment id=3D"ContentLeftTop">
<template name=3D"Content">
<asp:TextBox id=3D"ctlSurname" runat=3D"server"
Colums=3D"20" MaxLength=3D"20" TextMode=3D"SingleLine" width=3D"100%"/>
</template>
</DkWeb:Fragment>
<--
I can not access the Textbox by its Id. Normally there is - on the page
- a variable generated whose name is the ID. In this case, the Name is
somehow composed by the name of the page plus another verb plus a number
- which is making it impossible to access the control, because the
number can change when the template is edited.
On the bad side: all the relevant parts of the documentation seem "still
to come".
Now, anyone has any knowledge on how I can take handle this? What I
actually want is that the above textbox is accessible from Script by its
id as would normally be the case.
Scott, if you read this - this is a similar request to the email I sent
to you yesterday, just that the email was longer and contained the
complete generated source for a page.
Any help is greatly appreciated.
Thomas Tomiczek
---
---
Message #4 by "Thomas Tomiczek" <thona@g...> on Fri, 6 Oct 2000 17:39:02 +0200
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Content-Transfer-Encoding: quoted-printable
Hello,
I had a second look at the quickstart and actually what I try to do is
similar to Custom Parsing Controls second Example. But I need the
contained template to be "first class code", i.e. I need to be able to
access the controls defined in there as scribt. An example page is:
-->
<%@ Page Language=3D"C#"%>
<%@ Assembly src=3D"Daikiri.Membership.cs" %>
<%@ Register TagPrefix=3D"DkWeb" Namespace=3D"Daikiri.Web" %>
<%@ Import Namespace=3D"System.Data" %>
<%@ Import Namespace=3D"System.Data.SQL" %>
<%@ Import Namespace=3D"Daikiri.Membership" %>
<script runat=3D"server">
protected void Page_Load(Object Src, EventArgs e)
{
dsnDaikiri=3D(String)((Hashtable)Context.GetConfig("daikiri"))["database"
]
;
dsnDictionary=3D(String)((Hashtable)Context.GetConfig("daikiri"))["dictio
n
ary"];
SQLDataReader reader =3D null;
// If this is an original posting, we need to handle some setup here
if (!IsPostBack) {
MemberManager mgr =3D new MemberManager (dsnDaikiri);
DataView dv;
dv =3D mgr.ListDomains ();
foreach (DataRowView r in dv) {
ListItem newItem =3D new ListItem ( r["Name"].ToString());
//ctlUserDomain.Items.Add (newItem);
}
/*
}
}
protected void atnSave (Object sender, EventArgs e) {
// This routine actually only does something if the validations did OK
if (IsValid) {
}
}
// this is the connection string used to set up the MemberManager
String dsnDaikiri;
String dsnDictionary;
</script>
<DkWeb:FragmentHolder BasedOn=3D"/template175a550.aspx" runat=3Dserver>
<DkWeb:Fragment id=3D"ContentRight">
<template name=3D"Content">
<table width=3D"100%" border=3D"1">
<tr><td width=3D"50%">Name (4-30 Zeichen):</td>
<td>
<table width=3D"100%" cellspacing=3D"0" cellpadding=3D"0"><tr><td
widht=3D"50%">
<asp:TextBox id=3D"ctlUserName" runat=3D"server" Colums=3D"20"
MaxLength=3D"20" TextMode=3D"SingleLine" width=3D"100%"/>
</td><td width=3D"50%">
<asp:DropDownList id=3D"ctlUserDomain" runat=3D"server"
width=3D"100%"/>
</td></tr></table>
</td></tr>
<tr><td width=3D"50%">Passwort (4-30 Zeichen):</td>
<td><asp:TextBox id=3D"ctlPassword1" runat=3D"server" Colums=3D"30"
MaxLength=3D"30" TextMode=3D"SingleLine" width=3D"100%"/></td></tr>
<tr><td width=3D"50%">Passwort (Wiederholung):</td>
<td><asp:TextBox id=3D"ctlPassword2" runat=3D"server" Colums=3D"20"
MaxLength=3D"20" TextMode=3D"SingleLine" width=3D"100%"/></td></tr>
<tr><td colspan=3D"2">Bitte geben Sie ihr Passwort beide Male gleich
geschrieben ein.</td></tr>
<tr><td colspan=3D"2"> </td></tr>
<tr><td width=3D"50%">Geschlecht:</td>
<td><asp:DropDownList id=3D"ctlSex" runat=3D"server"
width=3D"100%"/></td></tr>
<tr><td width=3D"50%">Titel:</td>
<td><asp:TextBox id=3D"ctlTitle" runat=3D"server" Colums=3D"20"
MaxLength=3D"20" TextMode=3D"SingleLine" width=3D"100%"/></td></tr>
<tr><td width=3D"50%">Vorname:</td>
<td><asp:TextBox id=3D"ctlName" runat=3D"server" Colums=3D"20"
MaxLength=3D"20" TextMode=3D"SingleLine" width=3D"100%"/></td></tr>
<tr><td width=3D"50%">Nachname:</td>
<td><asp:TextBox id=3D"ctlSurname" runat=3D"server" Colums=3D"20"
MaxLength=3D"20" TextMode=3D"SingleLine" width=3D"100%"/></td></tr>
<tr><td colspan=3D"2"> </td></tr>
<tr><td width=3D"50%">Geburtstag:</td>
<td><asp:TextBox id=3D"ctlBirthdate" runat=3D"server" Colums=3D"20"
MaxLength=3D"20" TextMode=3D"SingleLine" width=3D"100%"/></td></tr>
<tr><td width=3D"50%">Land:</td>
<td><asp:DropDownList id=3D"ctlCountry" runat=3D"server"
width=3D"100%"/></td></tr>
<tr><td colspan=3D"2"> </td></tr>
<tr><td colspan=3D"2" align=3D"center">
<asp:Button runat=3D"server" Text=3D"Speichern"
OnClick=3D"atnSave"/>
</td></tr>
</table>
</template>
</DkWeb:Fragment>
</DkWeb:fragmentholder>
<--
This Fragment-Stuff has been done for visual inheritance - I actually
exchange a part of athe page inherited from another page, in this case
from "/template175a550.aspx.
Now, in the template I define a number of controls, like for example
<asp:DropDownList id=3D"ctlUserDomain" runat=3D"server"
width=3D"100%"/>.
From m yscript. I want this cotnrol to be available as ctluserDomain,
but it is not - it gets aavailable using a "funny name" as mentioned in
my earlier post.
So actually I think the ControlBuilder is somehow "f*****g this up" -
sorry for the words. The problem is there is NO documentation on how
this really works and how stuff interoperates, just the Quickstart
(which are not THAT helpfull on this level) and a lot of "still to
come".
Now its your turn again.
The result, btw, will be available for free download, this has been
discussed with Scott.
Thomas Tomiczek
-----Original Message-----
From: Rob Howard [mailto:rhoward@m...]
Sent: Freitag, 6. Oktober 2000 16:36
To: ASP+
Subject: [aspx] RE: Need help on landling templates in a WebControl.
Hi Thomas,
I believe you need to add some more code to the control to render the
textbox within DkWeb:Fragment using templates. I didn't have time to
write an example, but take a look at the ASP+ quickstarts "Authoring
Custom Contorls" section (towards the bottom of the page).
The TextBox control is created as child control of the parent. Without
templates (when it's only a simple composite control), you can access
the TextBox control as follows:
void Page_Load(){
TextBox ctlSurname =3D (TextBox)
ContentLeftTop.FindControl("ctlSurname");
ctlSurname.Text =3D "Hello from ctlSurname";
}
another problem, you need to mark DkWeb:Framgment with a runat=3Dserver
property:
<DkWeb:Fragment id=3D"ContentLeftTop" runat=3Dserver>
Hope that helps.
Thanks,
Rob
office xxx.xxx.xxxx | cell xxx.xxx.xxxx | fax xxx.xxx.xxxx (attn:
rhoward)
-----Original Message-----
From: Thomas Tomiczek [mailto:thona@g...]
Sent: Friday, October 06, 2000 2:37 AM
To: ASP+
Subject: [aspx] Need help on landling templates in a WebControl.
Hello,
I have a very simpla WebControl (actually written by Scott Guthrie [ :-)
] that I need to extend.
Its code is:
-->
public class Fragment : Control {
private ITemplate content =3D null;
public ITemplate Content {
get {
return content;
}
set {
content =3D value;
}
}
}
<--
Now, my problem is that when I use this control such as in
-->
<DkWeb:Fragment id=3D"ContentLeftTop">
<template name=3D"Content">
<asp:TextBox id=3D"ctlSurname" runat=3D"server"
Colums=3D"20" MaxLength=3D"20" TextMode=3D"SingleLine" width=3D"100%"/>
</template>
</DkWeb:Fragment>
<--
I can not access the Textbox by its Id. Normally there is - on the page
- a variable generated whose name is the ID. In this case, the Name is
somehow composed by the name of the page plus another verb plus a number
- which is making it impossible to access the control, because the
number can change when the template is edited.
On the bad side: all the relevant parts of the documentation seem "still
to come".
Now, anyone has any knowledge on how I can take handle this? What I
actually want is that the above textbox is accessible from Script by its
id as would normally be the case.
Scott, if you read this - this is a similar request to the email I sent
to you yesterday, just that the email was longer and contained the
complete generated source for a page.
Any help is greatly appreciated.
Thomas Tomiczek
---
---
Message #5 by Rob Howard <rhoward@m...> on Fri, 6 Oct 2000 10:11:07 -0700
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This message is in MIME format. Since your mail reader does not understand
this format, some or all of this message may not be legible.
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charset="iso-8859-1"
Thomas,
Well, see what happens when you don't send all the code the first time :)
I'll take a look at it later today.. unless Scott beats me to it.
Thanks,
Rob
office xxx.xxx.xxxx | cell xxx.xxx.xxxx | fax xxx.xxx.xxxx (attn: rhoward)
-----Original Message-----
From: Thomas Tomiczek [mailto:thona@g...]
Sent: Friday, October 06, 2000 8:25 AM
To: ASP+
Subject: [aspx] RE: Need help on landling templates in a WebControl.
Hello Rob,
well, its actually a little bit more complicated because this code was
written by Scott Guthrie :-).
The Fragment is included in something called a FragmentHolder that actually
looks like this:
-->
using System;
using System.Collections;
using System.Web;
using System.Web.UI;
namespace Daikiri.Web {
[ ControlBuilderAttribute(typeof(FragmentBuilder)) ]
public class FragmentHolder : Control, INamingContainer {
private String basedOn = null;
public String BasedOn {
get {
return basedOn;
}
set {
basedOn = value;
}
}
public ITemplate LoadFragmentTemplate(System.Web.UI.Page page,
String fragmentName) {
// Attempt to locate requested fragment from children collection
// BugBug: The below walk code is inefficient. Instead, we
should
// just use Control.FindControl to locate the appropriate
control.
// This does a hashtable lookup on the current naming container.
// However, in the PDC bits there was a bug which prevented
// Control.FindControl from working if the controls in quetion
// were unsited. Need to modify below code in Beta1.
foreach (Control child in this.Controls) {
if ((child.ID == fragmentName) && (child is Fragment)) {
return ((Fragment) child).Content;
}
}
// If the fragment is not in the children collection, attempt to
// resolve it from a parent page to see if it is inherited
if (this.BasedOn != null) {
Control basepage = page.LoadControl(basedOn);
if (basepage == null) {
throw new Exception("Couldn't load base page: " +
basedOn);
}
foreach (Control child in basepage.Controls) {
if (child is FragmentHolder) {
return ((FragmentHolder)
child).LoadFragmentTemplate(page, fragmentName);
}
}
}
throw new Exception("Cannot find " + fragmentName + "
fragment!");
}
protected override void CreateChildControls() {
// Load "main" fragment of page -- this is the entrypoint
// for the page and controls overall page rendering
ITemplate maintemplate = LoadFragmentTemplate(Page, "main");
// Instantiate "main" fragment and insert it into the page tree
maintemplate.Initialize(this);
}
}
// The below custom ControlBuilder implementation enables page
developers to
// drop <dell:fragment> sections within a <dell:fragmentholder> section
// without having to have "runat=server" attributes on them.
public class FragmentBuilder : ControlBuilder {
public override Type GetChildControlType(string tagName, IDictionary
attribs) {
if (tagName.ToLower().EndsWith("fragment")) {
return typeof(Fragment);
}
return null;
}
}
}
<--
If you look at the FragmentBuilder - it takes care that there is no need for
runat="server".
The problem is that the names the controls get in the generated code are
somehow funny. something like PAGENAME_Ctrl22. Might bee (its all
undocumented) that I need to extend the FragmentBuilder, but how?
Thomas Tomiczek
-----Original Message-----
From: Rob Howard [mailto:rhoward@m...]
Sent: Freitag, 6. Oktober 2000 16:36
To: ASP+
Subject: [aspx] RE: Need help on landling templates in a WebControl.
Hi Thomas,
I believe you need to add some more code to the control to render the
textbox within DkWeb:Fragment using templates. I didn't have time to write
an example, but take a look at the ASP+ quickstarts "Authoring Custom
Contorls" section (towards the bottom of the page).
The TextBox control is created as child control of the parent. Without
templates (when it's only a simple composite control), you can access the
TextBox control as follows:
void Page_Load(){
TextBox ctlSurname = (TextBox) ContentLeftTop.FindControl("ctlSurname");
ctlSurname.Text = "Hello from ctlSurname";
}
another problem, you need to mark DkWeb:Framgment with a runat=server
property:
<DkWeb:Fragment id="ContentLeftTop" runat=server>
Hope that helps.
Thanks,
Rob
office xxx.xxx.xxxx | cell xxx.xxx.xxxx | fax xxx.xxx.xxxx (attn: rhoward)
-----Original Message-----
From: Thomas Tomiczek [mailto:thona@g...]
Sent: Friday, October 06, 2000 2:37 AM
To: ASP+
Subject: [aspx] Need help on landling templates in a WebControl.
Hello,
I have a very simpla WebControl (actually written by Scott Guthrie [ :-) ]
that I need to extend.
Its code is:
-->
public class Fragment : Control {
private ITemplate content = null;
public ITemplate Content {
get {
return content;
}
set {
content = value;
}
}
}
<--
Now, my problem is that when I use this control such as in
-->
<DkWeb:Fragment id="ContentLeftTop">
<template name="Content">
<asp:TextBox id="ctlSurname" runat="server"
Colums="20" MaxLength="20" TextMode="SingleLine" width="100%"/>
</template>
</DkWeb:Fragment>
<--
I can not access the Textbox by its Id. Normally there is - on the page - a
variable generated whose name is the ID. In this case, the Name is somehow
composed by the name of the page plus another verb plus a number - which is
making it impossible to access the control, because the number can change
when the template is edited.
On the bad side: all the relevant parts of the documentation seem "still to
come".
Now, anyone has any knowledge on how I can take handle this? What I actually
want is that the above textbox is accessible from Script by its id as would
normally be the case.
Scott, if you read this - this is a similar request to the email I sent to
you yesterday, just that the email was longer and contained the complete
generated source for a page.
Any help is greatly appreciated.
Thomas Tomiczek
---
---
---
Message #6 by "Thomas Tomiczek" <thona@g...> on Sat, 7 Oct 2000 07:59:04 +0200
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Content-Transfer-Encoding: quoted-printable
Yeah,
btw theres another class involved, which is
-->
using System;
using System.Collections;
using System.Web;
using System.Web.UI;
namespace Daikiri.Web {
public class FragmentReference : Control, INamingContainer {
private String reference =3D null;
public String Ref {
get {
return reference;
}
set {
reference =3D value;
}
}
protected override void CreateChildControls() {
// Walk parent hierarchy to locate parent
<dell:fragmentholder> control
Control fragmentHolder =3D this.Parent;
while ((fragmentHolder !=3D null) && ((fragmentHolder is
FragmentHolder)) !=3D true) {
fragmentHolder =3D fragmentHolder.Parent;
}
// Obtain Fragment Template
ITemplate template =3D ((FragmentHolder)
fragmentHolder).LoadFragmentTemplate(Page, reference);
// Instantiate and insert fragment into tree
template.Initialize(this);
}
}
}
<--
Hm, I could actually send you a complete sample project if you want.
Scott seems to be travelling around - no post from him the last days. So
you have a real good chance at beating him.
I really wished the Beta1 would be out - I assume with a little bit more
documentation I would be able to figure this out myself.
Thanks again
Thomas
-----Original Message-----
From: Rob Howard [mailto:rhoward@m...]
Sent: Freitag, 6. Oktober 2000 19:11
To: ASP+
Subject: [aspx] RE: Need help on landling templates in a WebControl.
Thomas,
Well, see what happens when you don't send all the code the first time
:)
I'll take a look at it later today.. unless Scott beats me to it.
Thanks,
Rob
office xxx.xxx.xxxx | cell xxx.xxx.xxxx | fax xxx.xxx.xxxx (attn:
rhoward)
-----Original Message-----
From: Thomas Tomiczek [mailto:thona@g...]
Sent: Friday, October 06, 2000 8:25 AM
To: ASP+
Subject: [aspx] RE: Need help on landling templates in a WebControl.
Hello Rob,
well, its actually a little bit more complicated because this code was
written by Scott Guthrie :-).
The Fragment is included in something called a FragmentHolder that
actually looks like this:
-->
using System;
using System.Collections;
using System.Web;
using System.Web.UI;
namespace Daikiri.Web {
[ ControlBuilderAttribute(typeof(FragmentBuilder)) ]
public class FragmentHolder : Control, INamingContainer {
private String basedOn =3D null;
public String BasedOn {
get {
return basedOn;
}
set {
basedOn =3D value;
}
}
public ITemplate LoadFragmentTemplate(System.Web.UI.Page page,
String fragmentName) {
// Attempt to locate requested fragment from children
collection
// BugBug: The below walk code is inefficient. Instead, we
should
// just use Control.FindControl to locate the appropriate
control.
// This does a hashtable lookup on the current naming
container.
// However, in the PDC bits there was a bug which prevented
// Control.FindControl from working if the controls in
quetion
// were unsited. Need to modify below code in Beta1.
foreach (Control child in this.Controls) {
if ((child.ID =3D=3D fragmentName) && (child is
Fragment)) {
return ((Fragment) child).Content;
}
}
// If the fragment is not in the children collection,
attempt to
// resolve it from a parent page to see if it is inherited
if (this.BasedOn !=3D null) {
Control basepage =3D page.LoadControl(basedOn);
if (basepage =3D=3D null) {
throw new Exception("Couldn't load base page: " +
basedOn);
}
foreach (Control child in basepage.Controls) {
if (child is FragmentHolder) {
return ((FragmentHolder)
child).LoadFragmentTemplate(page, fragmentName);
}
}
}
throw new Exception("Cannot find " + fragmentName + "
fragment!");
}
protected override void CreateChildControls() {
// Load "main" fragment of page -- this is the entrypoint
// for the page and controls overall page rendering
ITemplate maintemplate =3D LoadFragmentTemplate(Page,
"main");
// Instantiate "main" fragment and insert it into the page
tree
maintemplate.Initialize(this);
}
}
// The below custom ControlBuilder implementation enables page
developers to
// drop <dell:fragment> sections within a <dell:fragmentholder>
section
// without having to have "runat=3Dserver" attributes on them.
public class FragmentBuilder : ControlBuilder {
public override Type GetChildControlType(string tagName,
IDictionary attribs) {
if (tagName.ToLower().EndsWith("fragment")) {
return typeof(Fragment);
}
return null;
}
}
}
<--
If you look at the FragmentBuilder - it takes care that there is no need
for runat=3D"server".
The problem is that the names the controls get in the generated code are
somehow funny. something like PAGENAME_Ctrl22. Might bee (its all
undocumented) that I need to extend the FragmentBuilder, but how?
Thomas Tomiczek
-----Original Message-----
From: Rob Howard [mailto:rhoward@m...]
Sent: Freitag, 6. Oktober 2000 16:36
To: ASP+
Subject: [aspx] RE: Need help on landling templates in a WebControl.
Hi Thomas,
I believe you need to add some more code to the control to render the
textbox within DkWeb:Fragment using templates. I didn't have time to
write an example, but take a look at the ASP+ quickstarts "Authoring
Custom Contorls" section (towards the bottom of the page).
The TextBox control is created as child control of the parent. Without
templates (when it's only a simple composite control), you can access
the TextBox control as follows:
void Page_Load(){
TextBox ctlSurname =3D (TextBox)
ContentLeftTop.FindControl("ctlSurname");
ctlSurname.Text =3D "Hello from ctlSurname";
}
another problem, you need to mark DkWeb:Framgment with a runat=3Dserver
property:
<DkWeb:Fragment id=3D"ContentLeftTop" runat=3Dserver>
Hope that helps.
Thanks,
Rob
office xxx.xxx.xxxx | cell xxx.xxx.xxxx | fax xxx.xxx.xxxx (attn:
rhoward)
-----Original Message-----
From: Thomas Tomiczek [mailto:thona@g...]
Sent: Friday, October 06, 2000 2:37 AM
To: ASP+
Subject: [aspx] Need help on landling templates in a WebControl.
Hello,
I have a very simpla WebControl (actually written by Scott Guthrie [ :-)
] that I need to extend.
Its code is:
-->
public class Fragment : Control {
private ITemplate content =3D null;
public ITemplate Content {
get {
return content;
}
set {
content =3D value;
}
}
}
<--
Now, my problem is that when I use this control such as in
-->
<DkWeb:Fragment id=3D"ContentLeftTop">
<template name=3D"Content">
<asp:TextBox id=3D"ctlSurname" runat=3D"server"
Colums=3D"20" MaxLength=3D"20" TextMode=3D"SingleLine" width=3D"100%"/>
</template>
</DkWeb:Fragment>
<--
I can not access the Textbox by its Id. Normally there is - on the page
- a variable generated whose name is the ID. In this case, the Name is
somehow composed by the name of the page plus another verb plus a number
- which is making it impossible to access the control, because the
number can change when the template is edited.
On the bad side: all the relevant parts of the documentation seem "still
to come".
Now, anyone has any knowledge on how I can take handle this? What I
actually want is that the above textbox is accessible from Script by its
id as would normally be the case.
Scott, if you read this - this is a similar request to the email I sent
to you yesterday, just that the email was longer and contained the
complete generated source for a page.
Any help is greatly appreciated.
Thomas Tomiczek
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