IPostBackDataHandler problem

[Piotr Nowak]

Hi,

Im developing a RibbonBar Control in asp.net 1.1 by converting already
done in asp.net 2.0.
My problem is that theres no compositecontrol in 1.1. Correct me if im
wrong, heres what i want to achieve.

My RibbonButton control is a regular webcontrol. RibbonButton
instantiates a hiddenfield inside by creating new instance. So we have
simple situation here wheres RibbonControl that contains hiddenfield
control inside.
Note that aps.net 1.1 does not have hidden fields so i created my own
listed below:

public class SharedStateHiddenField : WebControl, IPostBackDataHandler
{
public string Value
{
get { return ViewState["Value"] != null ? (string)ViewState["Value"]
: string.Empty; }
set { ViewState["Value"] = value; }
}

protected override void AddAttributesToRender(HtmlTextWriter writer)
{
writer.AddAttribute(HtmlTextWriterAttribute.Id, ClientID);
writer.AddAttribute(HtmlTextWriterAttribute.Name, ClientID);
writer.AddAttribute(HtmlTextWriterAttribute.Value, Value);
writer.AddAttribute(HtmlTextWriterAttribute.Type, "hidden");
}

protected override HtmlTextWriterTag TagKey
{
get
{
return HtmlTextWriterTag.Input;
}
}
#region IPostBackDataHandler Members

public void RaisePostDataChangedEvent()
{

}

bool IPostBackDataHandler.LoadPostData(string postDataKey,
System.Collections.Specialized.NameValueCollection values)
{
return LoadPostData(postDataKey, values);
}
protected virtual bool LoadPostData(string postDataKey,
System.Collections.Specialized.NameValueCollection values)
{
string val = values[this.ClientID];
bool changed = false;
if (val != Value)
{
Value = val;
changed = true;
}
return changed;
}

#endregion
}
}

So, when i do postback on whatever control on my page, this
IPostBackDataHandler in my hidden field is not fired !

i want it to be fired and thats my question, why ?

Do you possibly know what is wrong ?

regards, Peter

 

[Smith]

My problem is that theres no compositecontrol in 1.1. Correct me if im

wrong, heres what i want to achieve.

Composite controls come from 1.xx . Try this:
http://www.microsoft.com/MSPress/books/5728.aspx
Cheers
Smith

 

[Piotr Nowak]

Smith pisze:

Composite controls come from 1.xx . Try this:
http://www.microsoft.com/MSPress/books/5728.aspx
Cheers
Smith

Ok Found the problem.
I used clientId instead of uniqueId property, ma fault.

here's the correct code for hiddenfield control in asp.net 1.1

public class SharedStateHiddenField : WebControl, IPostBackDataHandler
{
public string Value
{
get { return ViewState["Value"] != null ? (string)ViewState["Value"]
: string.Empty; }
set { ViewState["Value"] = value; }
}

protected override void AddAttributesToRender(HtmlTextWriter writer)
{
writer.AddAttribute(HtmlTextWriterAttribute.Id, ClientID);
writer.AddAttribute(HtmlTextWriterAttribute.Name, UniqueID);
writer.AddAttribute(HtmlTextWriterAttribute.Value, Value);
writer.AddAttribute(HtmlTextWriterAttribute.Type, "hidden");
}

protected override HtmlTextWriterTag TagKey
{
get
{
return HtmlTextWriterTag.Input;
}
}
#region IPostBackDataHandler Members

public void RaisePostDataChangedEvent()
{

}

bool IPostBackDataHandler.LoadPostData(string postDataKey,
System.Collections.Specialized.NameValueCollection values)
{
return LoadPostData(postDataKey, values);
}
protected virtual bool LoadPostData(string postDataKey,
System.Collections.Specialized.NameValueCollection values)
{
string val = values[this.UniqueID];
bool changed = false;
if (val != Value)
{
Value = val;
changed = true;
}
return changed;
}

#endregion
}

 

[Mythran]

Note that aps.net 1.1 does not have hidden fields so i created my own
listed below:

What do you mean 1.1 doesn't have hidden fields?!? Check out the
System.Web.UI.HtmlControls namespace and look for the HtmlInputHidden
control.

HTH,
Mythran

 

[Piotr Nowak]

Mythran pisze:

What do you mean 1.1 doesn't have hidden fields?!? Check out the
System.Web.UI.HtmlControls namespace and look for the HtmlInputHidden
control.

HTH,
Mythran

oh, right
i think i was suggested by some news article saying that asp.net 2.0 has
some new features like the new HiddenField component.

anyway, thanks