I want to add attributes to a custom dropdownlist and I found some code
on Internet that doesn't work after post back.
First time the control has the attributes, but after postback the
attributes are lost.
It must be a bug in the code bellow. Can anyone help?
Thanks,
LG
using System;
using System.Web.UI;
using System.Web.UI.W ebControls;
using System.Componen tModel;
using System.Collecti ons;
namespace PD.Web.UI.WebCo ntrols
{
/// <summary>
/// Summary description for WebCustomContro l.
/// </summary>
public class PDDropDownList : System.Web.UI.W ebControls.Drop DownList
{
/// <summary>
/// Render this control to the output parameter specified.
/// </summary>
/// <param name="output"Th e HTML writer to write out to </param>
protected override void RenderContents( HtmlTextWriter writer)
{
for(int c=0;c<Items.Cou nt;c++)
{
ListItem i = Items[c];
writer.WriteBeg inTag("option") ;
if(i.Selected)
writer.WriteAtt ribute("selecte d","selected",f alse);
writer.WriteAtt ribute("value", i.Value,true);
IEnumerator d = Items[c].Attributes.Key s.GetEnumerator ();
while(d.MoveNex t())
writer.WriteAtt ribute(d.Curren t.ToString(),It ems[c].Attributes[d.Current.ToStr ing()]);
writer.Write('> ');
System.Web.Http Utility.HtmlEnc ode(i.Text,writ er);
writer.WriteEnd Tag("option");
writer.WriteLin e();
}
}
protected override object SaveViewState()
{
//Saves the ViewState of the dropdownlist
object baseState = base.SaveViewSt ate();
object[] allStates = new object[this.Items.Coun t+1];
allStates[0] = baseState;
for(int c=0;c<Items.Cou nt;c++)
{
int AttrisCount=Ite ms[c].Attributes.Cou nt;
object[] Attris=new object [AttrisCount*2];
int i=0;
IEnumerator d = Items[c].Attributes.Key s.GetEnumerator ();
while(d.MoveNex t())
{
Attris[i++] =d.Current.ToSt ring();
Attris[i++] =Items[c].Attributes[d.Current.ToStr ing()];
}
allStates[c+1] = Attris;
}
return allStates;
// return base.SaveViewSt ate();
}
protected override void LoadViewState(o bject savedState)
{
if (savedState != null)
{
// Load State from the array of objects that was saved at
SavedViewState.
object[] myState = (object[])savedState;
if (myState[0] != null)
base.LoadViewSt ate(myState[0]);
for(int c=1;c<myState.L ength;c++)
{
int AttrisCount=((o bject[])myState[c]).Length;
for(int n=0;n<(AttrisCo unt/2);n++)
{
object[] o = (object[])myState[c];
this.Items[c-1].Attributes.Add (o[n].ToString
(),o[n+1].ToString());
}
}
}
// base.LoadViewSt ate(savedState) ;
}
}
}
