Re: explanation of when need to repopulate control

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Thanks a bunch Steven I have gotten a lot of progress. I can always count on
you. I now have a new problem. The composite controls in my composite
control correctly fires their sub drop down lists which gets handled in my
main composite control. Then I have 4 drop down lists in my composite
control, and none of their selectedIndexChanged events fire.

I'm pretty sure i have all my bases covered and don't know what the problem
could be. Both sub composite controls use INamingContainter and set their
control's Id property.

Any other thoughts?

thanks

My latest code:
using System;

using System.Collections.Specialized;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Text;

using OperationsTeams.Business;

using OperationsTeams.Data;

using OperationsTeams.Reporting;

using OperationsTeams.Reporting.WebControls;

namespace OperationsTeams.Web.ReportControls

{

/// <summary>

/// Summary description for FiscalAgentHierarchy.

/// </summary>

public class FiscalAgentHierarchy : WebControl, IReportParameterControl,
INamingContainer

{

public FiscalAgentHierarchy()

{

Parameters.Add(new Parameter("@SchoolYear"));

Parameters.Add(new Parameter("@ReportingGroup"));

Parameters.Add(new Parameter("@FiscalAgentID"));

Parameters.Add(new Parameter("@FundingSourceID"));

Parameters.Add(new Parameter("@ProviderID"));

Parameters.Add(new Parameter("@SiteID"));

Parameters.Add(new Parameter("@ClassID"));

Parameters["@SchoolYear"].Value = 2006;


}


#region Events

protected override void OnPreRender(EventArgs e)

{

base.OnPreRender (e);

// The controls now have the client values from the the last postback

ddlFundingSource.Visible = FundingSourceVisible;

ddlProviders.Visible = ProviderVisible;

ddlSites.Visible = SiteVisible;

ddlClasses.Visible = ClassVisible;

}

private void rysReportingYearSelector_ReportingYearChanged(object sender,
EventArgs e)

{

this.LoadFundingSource();

this.LoadProviders();

}

private void fasFiscalAgent_FiscalAgentChanged(object sender, EventArgs e)

{

this.LoadFundingSource();

this.LoadProviders();

}

private void ddlFundingSource_SelectedIndexChanged(object sender, EventArgs
e)

{

LoadSites();

}

private void ddlProviders_SelectedIndexChanged(object sender, EventArgs e)

{

LoadSites();

}

private void ddlSites_SelectedIndexChanged(object sender, EventArgs e)

{

LoadClasses();

}

#endregion

protected override void CreateChildControls()

{

rysReportingYearSelector = new ReportingYearReportSelector();

fasFiscalAgent = new FiscalAgentReportSelector();

this.ddlFundingSource = new DropDownList();

this.ddlProviders = new DropDownList();

this.ddlSites = new DropDownList();

this.ddlClasses = new DropDownList();

rysReportingYearSelector.ID = ReportingYearSelectorControlId;

fasFiscalAgent.ID = FiscalAgentSelectorControlId;

ddlFundingSource.ID = FundingSourceControlId;

ddlProviders.ID = ProvidersControlId;

ddlSites.ID = SitesControlId;

ddlClasses.ID = ClassesControlId;

// Assign these controls' Page property because when they try to access Page
they get null reference - apparently they aren't in the control tree at that
point

rysReportingYearSelector.Page = this.Page;

fasFiscalAgent.Page = this.Page;


rysReportingYearSelector.ReportingYearChanged += new
EventHandler(rysReportingYearSelector_ReportingYearChanged);

fasFiscalAgent.FiscalAgentChanged += new
EventHandler(fasFiscalAgent_FiscalAgentChanged);

ddlProviders.SelectedIndexChanged += new
EventHandler(ddlProviders_SelectedIndexChanged);

ddlSites.SelectedIndexChanged += new
EventHandler(ddlSites_SelectedIndexChanged);

fasFiscalAgent.IsSubmitOnChange = true;

ddlProviders.AutoPostBack = true;

ddlSites.AutoPostBack = true;


// start containing table

this.Controls.Add(WebHelper.MakeLiteral("<table cellpadding=0
cellspacing=0><tr><td>"));


this.Controls.Add(WebHelper.MakeLiteral("<table><tr><td>"));

this.Controls.Add(rysReportingYearSelector);

this.Controls.Add(WebHelper.MakeLiteral("</td></tr></table>"));

this.Controls.Add(WebHelper.MakeLiteral("</td></tr><tr><td>"));

this.Controls.Add(WebHelper.MakeLiteral("<table><tr><td>"));

this.Controls.Add(fasFiscalAgent);

this.Controls.Add(WebHelper.MakeLiteral("</td></tr></table>"));

this.Controls.Add(WebHelper.MakeLiteral("</td></tr><tr><td>"));

this.Controls.Add(WebHelper.MakeLiteral("<table><tr><td>Funding
Source</td><td>"));

this.Controls.Add(ddlFundingSource);

this.Controls.Add(WebHelper.MakeLiteral("</td></tr></table>"));

this.Controls.Add(WebHelper.MakeLiteral("</td></tr><tr><td>"));

this.Controls.Add(WebHelper.MakeLiteral("<table><tr><td>Providers</td><td>")
);

this.Controls.Add(ddlProviders);

this.Controls.Add(WebHelper.MakeLiteral("</td></tr></table>"));

this.Controls.Add(WebHelper.MakeLiteral("</td></tr><tr><td>"));

this.Controls.Add(WebHelper.MakeLiteral("<table><tr><td>Sites</td><td>"));

this.Controls.Add(ddlSites);

this.Controls.Add(WebHelper.MakeLiteral("</td></tr></table>"));

this.Controls.Add(WebHelper.MakeLiteral("</td></tr><tr><td>"));

this.Controls.Add(WebHelper.MakeLiteral("<table><tr><td>Classes</td><td>"));

this.Controls.Add(ddlClasses);

this.Controls.Add(WebHelper.MakeLiteral("</td></tr></table>"));

// end containing table

this.Controls.Add(WebHelper.MakeLiteral("</td></tr></table>"));

}

private void LoadFundingSource()

{

int fiscalAgentId = this.fasFiscalAgent.SelectedFiscalAgentId;


if(fiscalAgentId != int.MinValue)

{

FundingSourceVisible = true;

this.ddlFundingSource.DataSource = FiscalAgentFunding.Find(fiscalAgentId);

this.ddlFundingSource.DataTextField = "ShortDescription";

this.ddlFundingSource.DataValueField = "CodeId";

this.ddlFundingSource.DataBind();

if(this.ddlFundingSource.Items.Count > 1)

this.ddlFundingSource.Items.Insert(0, new ListItem(string.Empty,
string.Empty));

}

else

{

FundingSourceVisible = false;

}

}

private void LoadProviders()

{

int fiscalAgentId = fasFiscalAgent.SelectedFiscalAgentId;

if(fiscalAgentId != int.MinValue)

{

ProviderVisible = true;

// are these dates correct???????????????????????????

ddlProviders.DataSource = FiscalAgentProvider.Find(fiscalAgentId,
rysReportingYearSelector.ReportingYearStartDate,
rysReportingYearSelector.ReportingYearEndDate); //new DateTime(2005,7,1),
new DateTime(2006,6,30));

ddlProviders.DataTextField = "ProviderName";

ddlProviders.DataValueField = "ProviderId";

ddlProviders.DataBind();

ddlProviders.Items.Insert(0, new ListItem(string.Empty, string.Empty));

}

else

{

this.ddlProviders.Items.Clear();

ProviderVisible = false;

}

}

private void LoadSites()

{

if(ddlProviders.SelectedValue != string.Empty)

{

// Load the Site search parameters.

SiteFindArgs siteFindArgs=new SiteFindArgs();

siteFindArgs.FiscalAgentId=Convert.ToInt32(fasFiscalAgent.SelectedFiscalAgen
tId);

SiteVisible = true;

ddlSites.DataSource = Business.Site.Find(siteFindArgs);

ddlSites.DataTextField = "Name";

ddlSites.DataValueField = "SiteId";

ddlSites.DataBind();

ddlSites.Items.Insert(0, new ListItem(string.Empty, string.Empty));

}

else

{

ddlSites.Items.Clear();

SiteVisible = false;

}

}

private void LoadClasses()

{

if(ddlSites.SelectedValue != string.Empty)

{

AdultEdClassFindArgs adultEdClassFindArgs = new AdultEdClassFindArgs();

adultEdClassFindArgs.FiscalAgentId =
Convert.ToInt32(fasFiscalAgent.SelectedFiscalAgentId);

adultEdClassFindArgs.ReportingYearStartDate =
rysReportingYearSelector.ReportingYearStartDate;

adultEdClassFindArgs.ReportingYearEndDate =
rysReportingYearSelector.ReportingYearEndDate;

adultEdClassFindArgs.ProviderName = ddlProviders.SelectedValue;

adultEdClassFindArgs.SiteName = ddlSites.SelectedValue;


ClassVisible = true;

ddlClasses.DataSource = AdultEdClass.Find(adultEdClassFindArgs);

ddlClasses.DataTextField = "Name";

ddlClasses.DataValueField = "ClassId";

ddlClasses.DataBind();

ddlClasses.Items.Insert(0, new ListItem(string.Empty, string.Empty));

}

else

{

ddlClasses.Items.Clear();

ClassVisible = false;

}

}



#region Public Properties

#region IReportParameterControl Members

public object ParameterValue

{

get{ return null; }

set{ /*do nothing */ }

}

public ParameterCollection Parameters

{

get{ return parameters; }

set{ parameters = value;}

}

#endregion

protected bool FundingSourceVisible

{

get

{

if(ViewState["FundingSourceVisible"] == null)

{

return false;

}

return (bool)ViewState["FundingSourceVisible"];

}

set

{

TrackViewState();

ViewState["FundingSourceVisible"] = value;

}

}

protected bool ProviderVisible

{

get

{

if(ViewState["ProviderVisible"] == null)

{

return false;

}

return (bool)ViewState["ProviderVisible"];

}

set

{

TrackViewState();

ViewState["ProviderVisible"] = value;

}

}

protected bool SiteVisible

{

get

{

if(ViewState["SiteVisible"] == null)

{

return false;

}

return (bool)ViewState["SiteVisible"];

}

set

{

TrackViewState();

ViewState["SiteVisible"] = value;

}

}

protected bool ClassVisible

{

get

{

if(ViewState["ClassVisible"] == null)

{

return false;

}

return (bool)ViewState["ClassVisible"];

}

set

{

TrackViewState();

ViewState["ClassVisible"] = value;

}

}

#endregion

#region Private Member Variables

private ReportingYearReportSelector rysReportingYearSelector;

private FiscalAgentReportSelector fasFiscalAgent;

private DropDownList ddlFundingSource;

private DropDownList ddlProviders;

private DropDownList ddlSites;

private DropDownList ddlClasses;

private ParameterCollection parameters = new ParameterCollection();

#endregion

#region Private Constants

private const string ReportingYearSelectorControlId =
"rysReportingYearSelector";

private const string FiscalAgentSelectorControlId =
"fasFiscalAgentSelector";

private const string FundingSourceControlId = "ddlFundingSource";

private const string FundingSourceLabelControlId = "lblFundingSource";

private const string ProvidersControlId = "ddlProviders";

private const string ProvidersLabelControlId = "lblProviders";

private const string SitesControlId = "ddlSites";

private const string SitesLabelControlId = "lblSites";

private const string ClassesControlId = "ddlClasses";

private const string ClassesLabelControlId = "lblClasses";

#endregion

}

}


"Steven Cheng[MSFT]" <stcheng@xxxxxxxxxxxxxxxxxxxx> wrote in message
news:2rQIZ7$lFHA.940@xxxxxxxxxxxxxxxxxxxxxxxx
> Hi TS,
>
> See you again :-), seems you're rushing in a asp.net project these days?
> For the question you mentioned in this post, here are some of my
> understanding and suggestions:
>
> 1. ASP.NET controls derived from Control will automatically maintain its
> ViewStates according to the asp.net web page's events sequence. So for
> composite control, those nested sub Controls' status (properties which be
> persistd in Viewsstate ) will be store and retrieve automatically.
>
> 2. However, there're some thing we need to care when building composite
> control:
> #remember to implement INamingContainer for controls which will have
nested
> sub controls. Otherwise, even handler mapping, ViewState loading will
occur
> unexpectedly.
>
> #Do remember to assign a explicit ID for each sub controls(same reason as
> #1). Also, please always try best to add subcontrols in the
> "CreateChildControls" method(just create control hierarchy) and put
> manipulating code in postback event or PreRender event.
>
> In addition, for your detaile scenario, I've just built a very simple demo
> control which have three dropdownlists and The "Top" one will display
> first(other twos invisible) and according to the top one's selection, the
> "Mid" dropdownlist will be pouplated and the same when the "mid"'s
> selection changed......
>
> Here's the control's code for your reference:
>
> =========================
> [DefaultProperty("Text"),
> ToolboxData("<{0}:MultiListControl runat=server></{0}:MultiListControl>")]
> public class MultiListControl : System.Web.UI.WebControls.WebControl,
> INamingContainer
> {
> private string text;
>
> private DropDownList lstTop;
> private DropDownList lstMid;
> private DropDownList lstBot;
>
>
>
>
>
> protected bool MidVisible
> {
> get{
> if(ViewState["MID_VISIBLE"] == null)
> {
> return false;
> }
>
> return (bool)ViewState["MID_VISIBLE"];
> }
>
> set{
> TrackViewState();
> ViewState["MID_VISIBLE"] = value;
> }
> }
>
> protected bool BotVisible
> {
> get
> {
> if(ViewState["BOT_VISIBLE"] == null)
> {
> return false;
> }
>
> return (bool)ViewState["BOT_VISIBLE"];
> }
>
> set
> {
> TrackViewState();
> ViewState["BOT_VISIBLE"] = value;
> }
> }
>
>
> [Bindable(true),
> Category("Appearance"),
> DefaultValue("")]
> public string Text
> {
> get
> {
> return text;
> }
>
> set
> {
> text = value;
> }
> }
>
>
> protected override void CreateChildControls()
> {
> Controls.Clear();
>
> Controls.Add(
> new LiteralControl(
> @"
> <table width='100%'>
> <tr><td>
> "));
>
> lstTop = new DropDownList();
> lstTop.ID = "lstTop";
>
> lstTop.Items.Add("----------");
> lstTop.Items.Add("Top_Item_1");
> lstTop.Items.Add("Top_Item_2");
> lstTop.Items.Add("Top_Item_3");
> lstTop.Items.Add("Top_Item_4");
>
> Controls.Add(lstTop);
>
> Controls.Add(
> new LiteralControl(
> @"<br/>"
> ));
>
> lstMid = new DropDownList();
> lstMid.ID = "lstMid";
>
> Controls.Add(lstMid);
>
> Controls.Add(
> new LiteralControl(
> @"<br/>"
> ));
>
>
> lstBot = new DropDownList();
> lstBot.ID = "lstBot";
>
> Controls.Add(lstBot);
>
>
> Controls.Add(
> new LiteralControl(
> @"
> </td></tr>
> </table>
> "
> ));
>
>
>
> lstTop.SelectedIndexChanged +=new EventHandler(lst_SelectedIndexChanged);
> lstMid.SelectedIndexChanged +=new EventHandler(lst_SelectedIndexChanged);
> lstBot.SelectedIndexChanged +=new EventHandler(lst_SelectedIndexChanged);
>
> lstTop.AutoPostBack = lstMid.AutoPostBack = lstBot.AutoPostBack = true;
>
>
> }
>
>
> protected override void OnPreRender(EventArgs e)
> {
> base.OnPreRender (e);
>
> lstMid.Visible = MidVisible;
> lstBot.Visible = BotVisible;
> }
>
>
>
>
> private void lst_SelectedIndexChanged(object sender, System.EventArgs e)
> {
>
> DropDownList lst = sender as DropDownList;
>
> switch(lst.ID)
> {
> case "lstTop":
>
> if(lst.SelectedIndex != 0)
> {
> lstMid.DataSource = GetSubItems(lst.SelectedValue);
> lstMid.DataTextField = "Text";
> lstMid.DataValueField= "Value";
> lstMid.DataBind();
>
> MidVisible = true;
> }
> else
> {
> MidVisible = BotVisible = false;
> }
>
> break;
> case "lstMid":
>
> lstBot.DataSource = GetSubItems(lst.SelectedValue);
> lstBot.DataTextField = "Text";
> lstBot.DataValueField= "Value";
> lstBot.DataBind();
>
> MidVisible = BotVisible = true;
>
> break;
> case "lstBot":
>
>
>
> break;
> }
>
> Page.Response.Write("<br>" + lst.ID + "_selectedindexchanged!" +
> lst.EnableViewState);
> }
>
> #region --Helper functions---
>
> public ListItemCollection GetSubItems(string parent)
> {
> ListItemCollection items = new ListItemCollection();
> int count = parent.Length;
>
> for(int i=0;i<count;++i)
> {
> items.Add(parent + "_Item_" + i);
> }
>
> return items;
> }
>
>
> #endregion
> }
>
> ========================
> 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.)
>
>
> --------------------
> | From: "TS" <manofsteele1@xxxxxxxxxxxxx>
> | References: <uzUvXf6lFHA.1372@xxxxxxxxxxxxxxxxxxxx>
> | Subject: Re: explanation of when need to repopulate control
> | Date: Tue, 2 Aug 2005 18:32:23 -0500
> | Lines: 39
> | X-Priority: 3
> | X-MSMail-Priority: Normal
> | X-Newsreader: Microsoft Outlook Express 6.00.2800.1158
> | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165
> | Message-ID: <uRDywp7lFHA.3552@xxxxxxxxxxxxxxxxxxxx>
> | Newsgroups:
>
microsoft.public.dotnet.framework.aspnet.webcontrols,microsoft.public.dotnet
> framework.aspnet.buildingcontrols
> | NNTP-Posting-Host: 103nat100.tea.state.tx.us 198.214.103.100
> | Path: TK2MSFTNGXA01.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTNGP10.phx.gbl
> | Xref: TK2MSFTNGXA01.phx.gbl
> microsoft.public.dotnet.framework.aspnet.buildingcontrols:3979
> microsoft.public.dotnet.framework.aspnet.webcontrols:10243
> | X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet.buildingcontrols
> |
> | sorry, heres the scenario i'm trying to accomplish:
> | I have a composite control that contains 4 drop down lists. When the
page
> | loads initially, i want the first drop down filled and the rest
invisible.
> | When you select an item in this ddl, it posts back to the server and
based
> | on its value, it populates its immediate child's drop down list. So now
> the
> | top ddl has a value selected and the 2nd one just has its items
populated.
> | Then when the 2nd drop down list gets selected, it posts to the server
and
> | its value is used to populate(filter) the items for the 3rd drop down
> | list...and so on for each drop down list.
> |
> | Please tell me what i need to do to handle post back data and maintain
> state
> | from one postback to another while keeping the drop downlists filled and
> | their values persisted.
> |
> | thank you again!
> |
> |
> | "TS" <manofsteele1@xxxxxxxxxxxxx> wrote in message
> | news:uzUvXf6lFHA.1372@xxxxxxxxxxxxxxxxxxxxxxx
> | > I have a quesiton:
> | > if i have a composite control and on its intial page loading, i fill
my
> | (sub
> | > control) drop down list's items collection from the database and
return.
> | > When the user hits a button to cause postback, the control is going to
> get
> | > initialized, then does its items collection that i filled on the
initial
> | > page request get repopulated from viewstate? And on top of that, if
so,
> | does
> | > the list item that person selected in the drop down list again set
> itself
> | as
> | > the selected item in the list?
> | >
> | > OR do i have to re-load the items on every page request and then
> populate
> | > its value some other way???
> | >
> | > thanks a bunch
> | >
> | >
> |
> |
> |
>


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