I've been building some custom controls which have some special functionality
with the data I use from a web service, specifically the ability to data bind
to attributes (without an accessor method).
However I've come accross an interesting issue with using them. I have
reimplemented the class from
public class WCCombobox : Control, IPostBackDataHa ndler
so that I can load the post data back in. It works great, it gets to the
method and loads it in from the post back namevaluecollec tion. however when
the same control is put on a usercontrol, which is put on the page, rather
than put directly on the page, the loadPostData event doesnt actually get
called.
It works fine directly on the page. It doesnt work on the user control. I've
put 2 controls on the same page, one in a usercontrol, the other directly on
the page, and as I said, the one in the usercontrol doesnt work. The one
directly on the page does.
Has anybody come accross this before? Does anybody have any sugestions on
what I might not be doing to fix this?
9  2370 
When you are writing out the postable tag, what id and name attribute are
you writing out? Pretend you are writing out a text box.
writer.AddAttri bute( "type", "text" );
writer.AddAttri bute( "name", UniqueID );
writer.AddAttri bute( "id", ClientID );
writer.RenderBe ginTag( HtmlTextWriterT ag.Input );
writer.RenderEn dTag();
Notice the UniqueID and ClientID, there is no ID anywhere.
UserControl implements INamingContaine r which will ensure all controls have
unique IDs.
Image if you had on your page a asp:TextBox id="txtName" and in your
UserControl (id="myUC" ) you had another textbox called "txtName". There
would be all sorts of naming collisions. The textbox in your usercontrol
will render out the name and ID "myUC_txtNa me", or something to that affect.
If this doesn't help you out, post some of your overridden Render code and I
can help you through it.
bill
"brian.mill s" <br********@dis cussions.micros oft.com> wrote in message
news:B8******** *************** ***********@mic rosoft.com... I've been building some custom controls which have some special
functionality with the data I use from a web service, specifically the ability to data
bind to attributes (without an accessor method).
However I've come accross an interesting issue with using them. I have
reimplemented the class from
public class WCCombobox : Control, IPostBackDataHa ndler
so that I can load the post data back in. It works great, it gets to the
method and loads it in from the post back namevaluecollec tion. however
when the same control is put on a usercontrol, which is put on the page, rather
than put directly on the page, the loadPostData event doesnt actually get
called.
It works fine directly on the page. It doesnt work on the user control.
I've put 2 controls on the same page, one in a usercontrol, the other directly
on the page, and as I said, the one in the usercontrol doesnt work. The one
directly on the page does.
Has anybody come accross this before? Does anybody have any sugestions on
what I might not be doing to fix this?
Hmmm. Thats not exactly how I'm rendering the control. Are there any good
articles you know of to render the control? I'm actually rendering a string,
a specific string because I want precise control over the HTML. (I've added
attributes onto the <input tag which get used by client side java script).
I'll try that out now though and see if it helps, I definatly am not using
the unique ID, or the client ID. I'll have to have a look at them.
Brian.
"William F. Robertson, Jr." wrote: When you are writing out the postable tag, what id and name attribute are
you writing out? Pretend you are writing out a text box.
writer.AddAttri bute( "type", "text" );
writer.AddAttri bute( "name", UniqueID );
writer.AddAttri bute( "id", ClientID );
writer.RenderBe ginTag( HtmlTextWriterT ag.Input );
writer.RenderEn dTag();
Notice the UniqueID and ClientID, there is no ID anywhere.
UserControl implements INamingContaine r which will ensure all controls have
unique IDs.
Image if you had on your page a asp:TextBox id="txtName" and in your
UserControl (id="myUC" ) you had another textbox called "txtName". There
would be all sorts of naming collisions. The textbox in your usercontrol
will render out the name and ID "myUC_txtNa me", or something to that affect.
If this doesn't help you out, post some of your overridden Render code and I
can help you through it.
bill
"brian.mill s" <br********@dis cussions.micros oft.com> wrote in message
news:B8******** *************** ***********@mic rosoft.com... I've been building some custom controls which have some special
functionality with the data I use from a web service, specifically the ability to data
bind to attributes (without an accessor method).
However I've come accross an interesting issue with using them. I have
reimplemented the class from
public class WCCombobox : Control, IPostBackDataHa ndler
so that I can load the post data back in. It works great, it gets to the
method and loads it in from the post back namevaluecollec tion. however
when the same control is put on a usercontrol, which is put on the page, rather
than put directly on the page, the loadPostData event doesnt actually get
called.
It works fine directly on the page. It doesnt work on the user control.
I've put 2 controls on the same page, one in a usercontrol, the other directly
on the page, and as I said, the one in the usercontrol doesnt work. The one
directly on the page does.
Has anybody come accross this before? Does anybody have any sugestions on
what I might not be doing to fix this?
There really is nothing wrong with rendering the control using strings, you
are doing this in the override Render method of the control? Would you mind
posting some of your render code? The code of the html element you are
posting back. You still can have precise control over rendering using the
HtmlTextWriter classes.
As far as articles, I would recommend this book for writing server controls: http://www.microsoft.com/mspress/books/5728.asp
The html element that you are wanting to process the postback data on should
use name= UniqueID. UniqueID will be the same as ID unless you place your
control in a UserControl, or a repeater, or any other control that
implements INamingContaine r.
I could go further into why it works, and doesn't work just rendering the
ID, but most people aren't THAT interested in it. <grin>
bill
"brian.mill s" <br********@dis cussions.micros oft.com> wrote in message
news:E8******** *************** ***********@mic rosoft.com... Hmmm. Thats not exactly how I'm rendering the control. Are there any good
articles you know of to render the control? I'm actually rendering a
string, a specific string because I want precise control over the HTML. (I've
added attributes onto the <input tag which get used by client side java script).
I'll try that out now though and see if it helps, I definatly am not using
the unique ID, or the client ID. I'll have to have a look at them.
Brian.
"William F. Robertson, Jr." wrote:
When you are writing out the postable tag, what id and name attribute
are you writing out? Pretend you are writing out a text box.
writer.AddAttri bute( "type", "text" );
writer.AddAttri bute( "name", UniqueID );
writer.AddAttri bute( "id", ClientID );
writer.RenderBe ginTag( HtmlTextWriterT ag.Input );
writer.RenderEn dTag();
Notice the UniqueID and ClientID, there is no ID anywhere.
UserControl implements INamingContaine r which will ensure all controls
have unique IDs.
Image if you had on your page a asp:TextBox id="txtName" and in your
UserControl (id="myUC" ) you had another textbox called "txtName".
There would be all sorts of naming collisions. The textbox in your
usercontrol will render out the name and ID "myUC_txtNa me", or something to that
affect.
If this doesn't help you out, post some of your overridden Render code
and I can help you through it.
bill
"brian.mill s" <br********@dis cussions.micros oft.com> wrote in message
news:B8******** *************** ***********@mic rosoft.com... I've been building some custom controls which have some special
functionality with the data I use from a web service, specifically the ability to
data bind to attributes (without an accessor method).
However I've come accross an interesting issue with using them. I have
reimplemented the class from
public class WCCombobox : Control, IPostBackDataHa ndler
so that I can load the post data back in. It works great, it gets to
the method and loads it in from the post back namevaluecollec tion. however
when the same control is put on a usercontrol, which is put on the page,
rather than put directly on the page, the loadPostData event doesnt actually
get called.
It works fine directly on the page. It doesnt work on the user
control. I've put 2 controls on the same page, one in a usercontrol, the other
directly on the page, and as I said, the one in the usercontrol doesnt work. The
one directly on the page does.
Has anybody come accross this before? Does anybody have any sugestions
on what I might not be doing to fix this?
There really is nothing wrong with rendering the control using strings, you
are doing this in the override Render method of the control? Would you mind
posting some of your render code? The code of the html element you are
posting back. You still can have precise control over rendering using the
HtmlTextWriter classes.
As far as articles, I would recommend this book for writing server controls: http://www.microsoft.com/mspress/books/5728.asp
The html element that you are wanting to process the postback data on should
use name= UniqueID. UniqueID will be the same as ID unless you place your
control in a UserControl, or a repeater, or any other control that
implements INamingContaine r.
I could go further into why it works, and doesn't work just rendering the
ID, but most people aren't THAT interested in it. <grin>
bill
"brian.mill s" <br********@dis cussions.micros oft.com> wrote in message
news:E8******** *************** ***********@mic rosoft.com... Hmmm. Thats not exactly how I'm rendering the control. Are there any good
articles you know of to render the control? I'm actually rendering a
string, a specific string because I want precise control over the HTML. (I've
added attributes onto the <input tag which get used by client side java script).
I'll try that out now though and see if it helps, I definatly am not using
the unique ID, or the client ID. I'll have to have a look at them.
Brian.
"William F. Robertson, Jr." wrote:
When you are writing out the postable tag, what id and name attribute
are you writing out? Pretend you are writing out a text box.
writer.AddAttri bute( "type", "text" );
writer.AddAttri bute( "name", UniqueID );
writer.AddAttri bute( "id", ClientID );
writer.RenderBe ginTag( HtmlTextWriterT ag.Input );
writer.RenderEn dTag();
Notice the UniqueID and ClientID, there is no ID anywhere.
UserControl implements INamingContaine r which will ensure all controls
have unique IDs.
Image if you had on your page a asp:TextBox id="txtName" and in your
UserControl (id="myUC" ) you had another textbox called "txtName".
There would be all sorts of naming collisions. The textbox in your
usercontrol will render out the name and ID "myUC_txtNa me", or something to that
affect.
If this doesn't help you out, post some of your overridden Render code
and I can help you through it.
bill
"brian.mill s" <br********@dis cussions.micros oft.com> wrote in message
news:B8******** *************** ***********@mic rosoft.com... I've been building some custom controls which have some special
functionality with the data I use from a web service, specifically the ability to
data bind to attributes (without an accessor method).
However I've come accross an interesting issue with using them. I have
reimplemented the class from
public class WCCombobox : Control, IPostBackDataHa ndler
so that I can load the post data back in. It works great, it gets to
the method and loads it in from the post back namevaluecollec tion. however
when the same control is put on a usercontrol, which is put on the page,
rather than put directly on the page, the loadPostData event doesnt actually
get called.
It works fine directly on the page. It doesnt work on the user
control. I've put 2 controls on the same page, one in a usercontrol, the other
directly on the page, and as I said, the one in the usercontrol doesnt work. The
one directly on the page does.
Has anybody come accross this before? Does anybody have any sugestions
on what I might not be doing to fix this?
Below is the render method I have at the moment.
I spent some time re coding a text box control to inherit from WebControl,
instead of just control. Now it apears to work, but I dont think my
postBackDataHan dler is the one that is kicking in, as it never stops in the
break point for the control that I wrote for the control on the user control.
It does stop for the one on the page it self still. Do i actually have to
call the post back data handler method for the usercontrols, and then for the
controls on the user control.
[DefaultProperty ("Text"),
ToolboxData("<{ 0}:WCTextbox runat=server></{0}:WCTextbox>" )]
public class WCTextbox : System.Web.UI.W ebControls.WebC ontrol,
IPostBackDataHa ndler
{
protected override void Render(HtmlText Writer output)
{
string lStr = "";
// If outputing printable form just write out the value
if ( this.printableF orm) {
output.Write( "<span id=\"" + this.UniqueID + "\" class=\"" +
this.CssClass + "\">" + this.Value + "</span>");
}
// Creating an actual text box
else if ( this.lines > 1 ) {
// Add main values to string
lStr = "<textarea name=\"" + this.ClientID + "\" id=\"" + this.UniqueID
+ "\" cols=\"" + (this.sizePx * 0.12).ToString( )
+ "\" style=\"width:" + this.sizePx.ToS tring() + "px;" + this.Style
+ "\" rows=\"" + this.lines
+ "\" class=\"" + this.CssClass
+ "\"";
// Add validation attibutes if required
if ( this.validation Use ) {
lStr = lStr + " validation=\"" + this.validation String + "\"
displayname=\"" + this.displayNam e + "\" onfocus=\"javas cript:MakeWhite (
this);\"";
}
lStr = lStr + ">" + this.Value + "</textarea>";
// Write out complete code to page
output.Write( lStr);
} else {
// Add main values to string
lStr = "<input type=\"text\" name=\"" + this.ClientID + "\" id=\"" +
this.UniqueID
+ "\" value=\"" + this.Value
+ "\" size=\"" + (this.sizePx * 0.12).ToString( )
+ "\" style=\"width:" + this.sizePx.ToS tring() + "px;" + this.getStyles( )
+ "\" class=\"" + this.CssClass
+ "\"";
// Add max length if required
if ( this.maxLength > 0 ) {
lStr = lStr + " maxlength=\"" + this.maxLength. ToString() + "\"";
}
// Add validation attibutes if required
if ( this.validation Use ) {
lStr = lStr + " validation=\"" + this.validation String + "\"
displayname=\"" + this.displayNam e + "\" onfocus=\"javas cript:MakeWhite (
this);\"";
}
lStr = lStr + ">";
// Write out complete code to page
output.Write( lStr);
}
}
}
Below is the render method I have at the moment.
I spent some time re coding a text box control to inherit from WebControl,
instead of just control. Now it apears to work, but I dont think my
postBackDataHan dler is the one that is kicking in, as it never stops in the
break point for the control that I wrote for the control on the user control.
It does stop for the one on the page it self still. Do i actually have to
call the post back data handler method for the usercontrols, and then for the
controls on the user control.
[DefaultProperty ("Text"),
ToolboxData("<{ 0}:WCTextbox runat=server></{0}:WCTextbox>" )]
public class WCTextbox : System.Web.UI.W ebControls.WebC ontrol,
IPostBackDataHa ndler
{
protected override void Render(HtmlText Writer output)
{
string lStr = "";
// If outputing printable form just write out the value
if ( this.printableF orm) {
output.Write( "<span id=\"" + this.UniqueID + "\" class=\"" +
this.CssClass + "\">" + this.Value + "</span>");
}
// Creating an actual text box
else if ( this.lines > 1 ) {
// Add main values to string
lStr = "<textarea name=\"" + this.ClientID + "\" id=\"" + this.UniqueID
+ "\" cols=\"" + (this.sizePx * 0.12).ToString( )
+ "\" style=\"width:" + this.sizePx.ToS tring() + "px;" + this.Style
+ "\" rows=\"" + this.lines
+ "\" class=\"" + this.CssClass
+ "\"";
// Add validation attibutes if required
if ( this.validation Use ) {
lStr = lStr + " validation=\"" + this.validation String + "\"
displayname=\"" + this.displayNam e + "\" onfocus=\"javas cript:MakeWhite (
this);\"";
}
lStr = lStr + ">" + this.Value + "</textarea>";
// Write out complete code to page
output.Write( lStr);
} else {
// Add main values to string
lStr = "<input type=\"text\" name=\"" + this.ClientID + "\" id=\"" +
this.UniqueID
+ "\" value=\"" + this.Value
+ "\" size=\"" + (this.sizePx * 0.12).ToString( )
+ "\" style=\"width:" + this.sizePx.ToS tring() + "px;" + this.getStyles( )
+ "\" class=\"" + this.CssClass
+ "\"";
// Add max length if required
if ( this.maxLength > 0 ) {
lStr = lStr + " maxlength=\"" + this.maxLength. ToString() + "\"";
}
// Add validation attibutes if required
if ( this.validation Use ) {
lStr = lStr + " validation=\"" + this.validation String + "\"
displayname=\"" + this.displayNam e + "\" onfocus=\"javas cript:MakeWhite (
this);\"";
}
lStr = lStr + ">";
// Write out complete code to page
output.Write( lStr);
}
}
}
No it still doesnt call it for the control on the user controls.
It does however If I use a normal ASP textbox control.
Do I have to call the load post back data from the page, call it for each
usercontrol, and then call it for each control on the user control? Or how
does it get subscribed to?
No it still doesnt call it for the control on the user controls.
It does however If I use a normal ASP textbox control.
Do I have to call the load post back data from the page, call it for each
usercontrol, and then call it for each control on the user control? Or how
does it get subscribed to?
The UniqueID needs to be rendered out for the name property. The name
property is what the key for what is posted back.
You should either use StringBuilder and its Append method for building your
string, or should just write directly to the writer.
(your code)
// Add main values to string
lStr = "<textarea name=\"" + this.UniqueID+ "\" id=\"" + this.ClientID
+ "\" cols=\"" + (this.sizePx * 0.12).ToString( )
+ "\" style=\"width:" + this.sizePx.ToS tring() + "px;" + this.Style
+ "\" rows=\"" + this.lines
+ "\" class=\"" + this.CssClass
+ "\"";
// Add validation attibutes if required
if ( this.validation Use )
{
lStr = lStr + " validation=\"" + this.validation String + "\"
displayname=\"" + this.displayNam e + "\" onfocus=\"javas cript:MakeWhite (
this);\"";
}
lStr = lStr + ">" + this.Value + "</textarea>";
// Write out complete code to page
output.Write( lStr);
(end your code)
This section code code actually loads and creates about 46 different
strings. Not too efficient.
Here is a sample of the writer approach.
output.Write( "<textarea name=\"" );
output.Write( this.UniqueID );
output.Write( "\" id=\" );
output.Write( this.ClientID );
....
Here is the HtmlTextWriter way to render this code. this covers the whole
section listed above. This is the method I prefer from my developers as it
is easier to read, and you don't have to count "\""\" \" + "\"" stuff. Did
you ever miss one and have to figure out exactly where to add a missing \"?
When you call RenderBeginTag, the HtmlTextWriter will step through all the
attributes that have been added and will write them out. After the opening
tag is send to the browser, you add the inner html and then on to the EndTag
that will renderd the closing tag. The HtmlTextWriter is smart enough to
remember what tag you are currently one. (I believe it uses a stack to keep
the tags order with).
output.AddAttri bute( "name", this.UniqueID );
output.AddAttri bute( "id", this.ClientID );
output.AddAttri bute( "cols", (this.sizePx * 0.12).ToString( ) );
output.AddAttri bute( "style", "width:" + this.sizePx + "px" + this.Style );
output.AddAttri bute( "rows", this.lines.ToSt ring() );
output.AddAttri bute( "class", this.CssClass );
if ( this.validation Use )
{
output.AddAttri bute( "validation ", this.validation String );
output.AddAttri bute( "displayNam e", this.displayNam e );
output.AddAttri bute( "onfocus", "javascript :Mak eWhite( this);" );
}
output.RenderBe ginTag( HtmlTextWriterT ag.Textarea );
output.Write( this.Value ); //you probably should encode this
//output.Write( System.Web.Http Utility.HtmlEnc ode( this.Value );
output.RenderEn dTag();
HTH,
bill
"brian.mill s" <br********@dis cussions.micros oft.com> wrote in message
news:4B******** *************** ***********@mic rosoft.com... No it still doesnt call it for the control on the user controls.
It does however If I use a normal ASP textbox control.
Do I have to call the load post back data from the page, call it for each
usercontrol, and then call it for each control on the user control? Or how
does it get subscribed to? This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
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by: TSSRALBI |
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Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
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by: 6302768590 |
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Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
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by: bsmnconsultancy |
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In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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