FindControl is null

Discussion in 'ASP .Net' started by =?Utf-8?B?Q2hyaXMgRmluaw==?=, Oct 15, 2004.

  1. In the below example could someone please assist in why the findcontrol
    method is returning null. Is there are easy way to determine where in the
    page heirarchy a control exists - I currently use the debugger and after I am
    done drilling down 10 levels deep I still can't easily tell where the control
    lives...

    ====CODE BEHIND====
    using System;
    using System.Collections;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Web;
    using System.Web.SessionState;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Web.UI.HtmlControls;

    namespace playground
    {
    public class tabs : System.Web.UI.Page
    {
    protected System.Web.UI.WebControls.Label lblFolders;

    private void Page_Load(object sender, System.EventArgs e)
    {

    // build html on fly
    System.Text.StringBuilder sb = new System.Text.StringBuilder();
    for(int i=0;i<5;i++)
    {
    string id = "v2" + i.ToString().Trim();
    sb.Append("<td name=\"" + id + "\" id=\"" + id + "\" bgcolor=\"#00e0\"
    width=\"10\" runat=\"server\"><a href=\"tabs.aspx?folder=" + id +
    "\">Folder</a></td>");
    sb.Append("<td width=\"1\"></td>");
    }

    lblFolders.Text=sb.ToString();

    if(Request.Params["folder"] != null)
    {
    highLightTab(Request.Params["folder"].ToString().Trim());
    }
    }

    private void highLightTab(string controlID)
    {
    if (controlID != null)
    {
    // this does not find the control
    HtmlTableCell td = (HtmlTableCell)Page.FindControl(controlID);
    try
    {
    td.BgColor="yellow";
    }
    catch
    {
    }
    }
    }


    #region Web Form Designer generated code
    override protected void OnInit(EventArgs e)
    {
    //
    // CODEGEN: This call is required by the ASP.NET Web Form Designer.
    //
    InitializeComponent();
    base.OnInit(e);
    }

    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {
    this.Load += new System.EventHandler(this.Page_Load);
    }
    #endregion
    }
    }

    ====HTML .ASPX====
    <%@ Page language="c#" Codebehind="tabs.aspx.cs" AutoEventWireup="false"
    Inherits="playground.tabs" %>
    <HTML>
    <HEAD>
    <title>tabs</title>
    </HEAD>
    <body>

    <form id="tabs" method="post" runat="server">
    <table border="1">
    <tr>
    <asp:Label ID="lblFolders" Runat="server"></asp:Label>
    </tr>
    </table>
    </form>
    </body>
    </HTML>
     
    =?Utf-8?B?Q2hyaXMgRmluaw==?=, Oct 15, 2004
    #1
    1. Advertising

  2. The FindControl Method is looking for a page element whose "id" property is
    set to the string value given. The value given is apparently not one that is
    found. The requested page element must support the "id" property.

    "Chris Fink" wrote:

    > In the below example could someone please assist in why the findcontrol
    > method is returning null. Is there are easy way to determine where in the
    > page heirarchy a control exists - I currently use the debugger and after I am
    > done drilling down 10 levels deep I still can't easily tell where the control
    > lives...
    >
    > ====CODE BEHIND====
    > using System;
    > using System.Collections;
    > using System.ComponentModel;
    > using System.Data;
    > using System.Drawing;
    > using System.Web;
    > using System.Web.SessionState;
    > using System.Web.UI;
    > using System.Web.UI.WebControls;
    > using System.Web.UI.HtmlControls;
    >
    > namespace playground
    > {
    > public class tabs : System.Web.UI.Page
    > {
    > protected System.Web.UI.WebControls.Label lblFolders;
    >
    > private void Page_Load(object sender, System.EventArgs e)
    > {
    >
    > // build html on fly
    > System.Text.StringBuilder sb = new System.Text.StringBuilder();
    > for(int i=0;i<5;i++)
    > {
    > string id = "v2" + i.ToString().Trim();
    > sb.Append("<td name=\"" + id + "\" id=\"" + id + "\" bgcolor=\"#00e0\"
    > width=\"10\" runat=\"server\"><a href=\"tabs.aspx?folder=" + id +
    > "\">Folder</a></td>");
    > sb.Append("<td width=\"1\"></td>");
    > }
    >
    > lblFolders.Text=sb.ToString();
    >
    > if(Request.Params["folder"] != null)
    > {
    > highLightTab(Request.Params["folder"].ToString().Trim());
    > }
    > }
    >
    > private void highLightTab(string controlID)
    > {
    > if (controlID != null)
    > {
    > // this does not find the control
    > HtmlTableCell td = (HtmlTableCell)Page.FindControl(controlID);
    > try
    > {
    > td.BgColor="yellow";
    > }
    > catch
    > {
    > }
    > }
    > }
    >
    >
    > #region Web Form Designer generated code
    > override protected void OnInit(EventArgs e)
    > {
    > //
    > // CODEGEN: This call is required by the ASP.NET Web Form Designer.
    > //
    > InitializeComponent();
    > base.OnInit(e);
    > }
    >
    > /// <summary>
    > /// Required method for Designer support - do not modify
    > /// the contents of this method with the code editor.
    > /// </summary>
    > private void InitializeComponent()
    > {
    > this.Load += new System.EventHandler(this.Page_Load);
    > }
    > #endregion
    > }
    > }
    >
    > ====HTML .ASPX====
    > <%@ Page language="c#" Codebehind="tabs.aspx.cs" AutoEventWireup="false"
    > Inherits="playground.tabs" %>
    > <HTML>
    > <HEAD>
    > <title>tabs</title>
    > </HEAD>
    > <body>
    >
    > <form id="tabs" method="post" runat="server">
    > <table border="1">
    > <tr>
    > <asp:Label ID="lblFolders" Runat="server"></asp:Label>
    > </tr>
    > </table>
    > </form>
    > </body>
    > </HTML>
     
    =?Utf-8?B?QnJhZCBSb2JlcnRz?=, Oct 15, 2004
    #2
    1. Advertising

  3. =?Utf-8?B?Q2hyaXMgRmluaw==?=

    Scott Allen Guest

    FindControl will only find server side controls (controls with a
    runat="server" attribute).

    HTH,

    --
    Scott
    http://www.OdeToCode.com/blogs/scott/


    On Fri, 15 Oct 2004 06:47:05 -0700, "Chris Fink"
    <> wrote:

    >In the below example could someone please assist in why the findcontrol
    >method is returning null. Is there are easy way to determine where in the
    >page heirarchy a control exists - I currently use the debugger and after I am
    >done drilling down 10 levels deep I still can't easily tell where the control
    >lives...
    >
    >====CODE BEHIND====
    >using System;
    >using System.Collections;
    >using System.ComponentModel;
    >using System.Data;
    >using System.Drawing;
    >using System.Web;
    >using System.Web.SessionState;
    >using System.Web.UI;
    >using System.Web.UI.WebControls;
    >using System.Web.UI.HtmlControls;
    >
    >namespace playground
    >{
    > public class tabs : System.Web.UI.Page
    > {
    > protected System.Web.UI.WebControls.Label lblFolders;
    >
    > private void Page_Load(object sender, System.EventArgs e)
    > {
    >
    > // build html on fly
    > System.Text.StringBuilder sb = new System.Text.StringBuilder();
    > for(int i=0;i<5;i++)
    > {
    > string id = "v2" + i.ToString().Trim();
    > sb.Append("<td name=\"" + id + "\" id=\"" + id + "\" bgcolor=\"#00e0\"
    >width=\"10\" runat=\"server\"><a href=\"tabs.aspx?folder=" + id +
    >"\">Folder</a></td>");
    > sb.Append("<td width=\"1\"></td>");
    > }
    >
    > lblFolders.Text=sb.ToString();
    >
    > if(Request.Params["folder"] != null)
    > {
    > highLightTab(Request.Params["folder"].ToString().Trim());
    > }
    > }
    >
    > private void highLightTab(string controlID)
    > {
    > if (controlID != null)
    > {
    > // this does not find the control
    > HtmlTableCell td = (HtmlTableCell)Page.FindControl(controlID);
    > try
    > {
    > td.BgColor="yellow";
    > }
    > catch
    > {
    > }
    > }
    > }
    >
    >
    > #region Web Form Designer generated code
    > override protected void OnInit(EventArgs e)
    > {
    > //
    > // CODEGEN: This call is required by the ASP.NET Web Form Designer.
    > //
    > InitializeComponent();
    > base.OnInit(e);
    > }
    >
    > /// <summary>
    > /// Required method for Designer support - do not modify
    > /// the contents of this method with the code editor.
    > /// </summary>
    > private void InitializeComponent()
    > {
    > this.Load += new System.EventHandler(this.Page_Load);
    > }
    > #endregion
    > }
    >}
    >
    >====HTML .ASPX====
    ><%@ Page language="c#" Codebehind="tabs.aspx.cs" AutoEventWireup="false"
    >Inherits="playground.tabs" %>
    ><HTML>
    > <HEAD>
    > <title>tabs</title>
    ></HEAD>
    > <body>
    >
    > <form id="tabs" method="post" runat="server">
    > <table border="1">
    > <tr>
    > <asp:Label ID="lblFolders" Runat="server"></asp:Label>
    > </tr>
    > </table>
    > </form>
    > </body>
    ></HTML>
     
    Scott Allen, Oct 15, 2004
    #3
  4. Scott,

    All my controls are server side....

    "Scott Allen" wrote:

    >
    > FindControl will only find server side controls (controls with a
    > runat="server" attribute).
    >
    > HTH,
    >
    > --
    > Scott
    > http://www.OdeToCode.com/blogs/scott/
    >
    >
    > On Fri, 15 Oct 2004 06:47:05 -0700, "Chris Fink"
    > <> wrote:
    >
    > >In the below example could someone please assist in why the findcontrol
    > >method is returning null. Is there are easy way to determine where in the
    > >page heirarchy a control exists - I currently use the debugger and after I am
    > >done drilling down 10 levels deep I still can't easily tell where the control
    > >lives...
    > >
    > >====CODE BEHIND====
    > >using System;
    > >using System.Collections;
    > >using System.ComponentModel;
    > >using System.Data;
    > >using System.Drawing;
    > >using System.Web;
    > >using System.Web.SessionState;
    > >using System.Web.UI;
    > >using System.Web.UI.WebControls;
    > >using System.Web.UI.HtmlControls;
    > >
    > >namespace playground
    > >{
    > > public class tabs : System.Web.UI.Page
    > > {
    > > protected System.Web.UI.WebControls.Label lblFolders;
    > >
    > > private void Page_Load(object sender, System.EventArgs e)
    > > {
    > >
    > > // build html on fly
    > > System.Text.StringBuilder sb = new System.Text.StringBuilder();
    > > for(int i=0;i<5;i++)
    > > {
    > > string id = "v2" + i.ToString().Trim();
    > > sb.Append("<td name=\"" + id + "\" id=\"" + id + "\" bgcolor=\"#00e0\"
    > >width=\"10\" runat=\"server\"><a href=\"tabs.aspx?folder=" + id +
    > >"\">Folder</a></td>");
    > > sb.Append("<td width=\"1\"></td>");
    > > }
    > >
    > > lblFolders.Text=sb.ToString();
    > >
    > > if(Request.Params["folder"] != null)
    > > {
    > > highLightTab(Request.Params["folder"].ToString().Trim());
    > > }
    > > }
    > >
    > > private void highLightTab(string controlID)
    > > {
    > > if (controlID != null)
    > > {
    > > // this does not find the control
    > > HtmlTableCell td = (HtmlTableCell)Page.FindControl(controlID);
    > > try
    > > {
    > > td.BgColor="yellow";
    > > }
    > > catch
    > > {
    > > }
    > > }
    > > }
    > >
    > >
    > > #region Web Form Designer generated code
    > > override protected void OnInit(EventArgs e)
    > > {
    > > //
    > > // CODEGEN: This call is required by the ASP.NET Web Form Designer.
    > > //
    > > InitializeComponent();
    > > base.OnInit(e);
    > > }
    > >
    > > /// <summary>
    > > /// Required method for Designer support - do not modify
    > > /// the contents of this method with the code editor.
    > > /// </summary>
    > > private void InitializeComponent()
    > > {
    > > this.Load += new System.EventHandler(this.Page_Load);
    > > }
    > > #endregion
    > > }
    > >}
    > >
    > >====HTML .ASPX====
    > ><%@ Page language="c#" Codebehind="tabs.aspx.cs" AutoEventWireup="false"
    > >Inherits="playground.tabs" %>
    > ><HTML>
    > > <HEAD>
    > > <title>tabs</title>
    > ></HEAD>
    > > <body>
    > >
    > > <form id="tabs" method="post" runat="server">
    > > <table border="1">
    > > <tr>
    > > <asp:Label ID="lblFolders" Runat="server"></asp:Label>
    > > </tr>
    > > </table>
    > > </form>
    > > </body>
    > ></HTML>

    >
    >
     
    =?Utf-8?B?Q2hyaXMgRmluaw==?=, Oct 15, 2004
    #4
  5. Hi,

    Setting a label's Text to some html does not add a control in the control
    collection of the page. If you want to add controls - change your label with
    placeholder and in the loop do something like this:

    for(int i=0;i<5;i++)
    {
    string id = string.Format("v2{0}", i);
    HtmlAnchor a = new HtmlAnchor();
    a.InnerText = "Folder";
    a.HRef = "tabs.aspx?folder=" + id;
    HtmlTableCell td = new HtmlTableCell();
    td.ID = id;
    td.BgColor = "#00e0";
    td.Width = "10"
    td.Controls.Add(a)
    placeHolder1.Controls.Add(td)
    }

    Hope this helps
    Martin Dechev
    ASP.NET MVP
    "Chris Fink" <> wrote in message
    news:...
    > In the below example could someone please assist in why the findcontrol
    > method is returning null. Is there are easy way to determine where in the
    > page heirarchy a control exists - I currently use the debugger and after I

    am
    > done drilling down 10 levels deep I still can't easily tell where the

    control
    > lives...
    >
    > ====CODE BEHIND====
    > using System;
    > using System.Collections;
    > using System.ComponentModel;
    > using System.Data;
    > using System.Drawing;
    > using System.Web;
    > using System.Web.SessionState;
    > using System.Web.UI;
    > using System.Web.UI.WebControls;
    > using System.Web.UI.HtmlControls;
    >
    > namespace playground
    > {
    > public class tabs : System.Web.UI.Page
    > {
    > protected System.Web.UI.WebControls.Label lblFolders;
    >
    > private void Page_Load(object sender, System.EventArgs e)
    > {
    >
    > // build html on fly
    > System.Text.StringBuilder sb = new System.Text.StringBuilder();
    > for(int i=0;i<5;i++)
    > {
    > string id = "v2" + i.ToString().Trim();
    > sb.Append("<td name=\"" + id + "\" id=\"" + id + "\" bgcolor=\"#00e0\"
    > width=\"10\" runat=\"server\"><a href=\"tabs.aspx?folder=" + id +
    > "\">Folder</a></td>");
    > sb.Append("<td width=\"1\"></td>");
    > }
    >
    > lblFolders.Text=sb.ToString();
    >
    > if(Request.Params["folder"] != null)
    > {
    > highLightTab(Request.Params["folder"].ToString().Trim());
    > }
    > }
    >
    > private void highLightTab(string controlID)
    > {
    > if (controlID != null)
    > {
    > // this does not find the control
    > HtmlTableCell td = (HtmlTableCell)Page.FindControl(controlID);
    > try
    > {
    > td.BgColor="yellow";
    > }
    > catch
    > {
    > }
    > }
    > }
    >
    >
    > #region Web Form Designer generated code
    > override protected void OnInit(EventArgs e)
    > {
    > //
    > // CODEGEN: This call is required by the ASP.NET Web Form Designer.
    > //
    > InitializeComponent();
    > base.OnInit(e);
    > }
    >
    > /// <summary>
    > /// Required method for Designer support - do not modify
    > /// the contents of this method with the code editor.
    > /// </summary>
    > private void InitializeComponent()
    > {
    > this.Load += new System.EventHandler(this.Page_Load);
    > }
    > #endregion
    > }
    > }
    >
    > ====HTML .ASPX====
    > <%@ Page language="c#" Codebehind="tabs.aspx.cs" AutoEventWireup="false"
    > Inherits="playground.tabs" %>
    > <HTML>
    > <HEAD>
    > <title>tabs</title>
    > </HEAD>
    > <body>
    >
    > <form id="tabs" method="post" runat="server">
    > <table border="1">
    > <tr>
    > <asp:Label ID="lblFolders" Runat="server"></asp:Label>
    > </tr>
    > </table>
    > </form>
    > </body>
    > </HTML>
     
    Martin Dechev, Oct 15, 2004
    #5
  6. =?Utf-8?B?Q2hyaXMgRmluaw==?=

    bruce barker Guest

    your dynamic html code does not build any server controls (its just text in
    a label), so there is no control to find.

    -- bruce (sqlwork.com)




    "Chris Fink" <> wrote in message
    news:...
    > In the below example could someone please assist in why the findcontrol
    > method is returning null. Is there are easy way to determine where in the
    > page heirarchy a control exists - I currently use the debugger and after I

    am
    > done drilling down 10 levels deep I still can't easily tell where the

    control
    > lives...
    >
    > ====CODE BEHIND====
    > using System;
    > using System.Collections;
    > using System.ComponentModel;
    > using System.Data;
    > using System.Drawing;
    > using System.Web;
    > using System.Web.SessionState;
    > using System.Web.UI;
    > using System.Web.UI.WebControls;
    > using System.Web.UI.HtmlControls;
    >
    > namespace playground
    > {
    > public class tabs : System.Web.UI.Page
    > {
    > protected System.Web.UI.WebControls.Label lblFolders;
    >
    > private void Page_Load(object sender, System.EventArgs e)
    > {
    >
    > // build html on fly
    > System.Text.StringBuilder sb = new System.Text.StringBuilder();
    > for(int i=0;i<5;i++)
    > {
    > string id = "v2" + i.ToString().Trim();
    > sb.Append("<td name=\"" + id + "\" id=\"" + id + "\" bgcolor=\"#00e0\"
    > width=\"10\" runat=\"server\"><a href=\"tabs.aspx?folder=" + id +
    > "\">Folder</a></td>");
    > sb.Append("<td width=\"1\"></td>");
    > }
    >
    > lblFolders.Text=sb.ToString();
    >
    > if(Request.Params["folder"] != null)
    > {
    > highLightTab(Request.Params["folder"].ToString().Trim());
    > }
    > }
    >
    > private void highLightTab(string controlID)
    > {
    > if (controlID != null)
    > {
    > // this does not find the control
    > HtmlTableCell td = (HtmlTableCell)Page.FindControl(controlID);
    > try
    > {
    > td.BgColor="yellow";
    > }
    > catch
    > {
    > }
    > }
    > }
    >
    >
    > #region Web Form Designer generated code
    > override protected void OnInit(EventArgs e)
    > {
    > //
    > // CODEGEN: This call is required by the ASP.NET Web Form Designer.
    > //
    > InitializeComponent();
    > base.OnInit(e);
    > }
    >
    > /// <summary>
    > /// Required method for Designer support - do not modify
    > /// the contents of this method with the code editor.
    > /// </summary>
    > private void InitializeComponent()
    > {
    > this.Load += new System.EventHandler(this.Page_Load);
    > }
    > #endregion
    > }
    > }
    >
    > ====HTML .ASPX====
    > <%@ Page language="c#" Codebehind="tabs.aspx.cs" AutoEventWireup="false"
    > Inherits="playground.tabs" %>
    > <HTML>
    > <HEAD>
    > <title>tabs</title>
    > </HEAD>
    > <body>
    >
    > <form id="tabs" method="post" runat="server">
    > <table border="1">
    > <tr>
    > <asp:Label ID="lblFolders" Runat="server"></asp:Label>
    > </tr>
    > </table>
    > </form>
    > </body>
    > </HTML>
     
    bruce barker, Oct 15, 2004
    #6
  7. =?Utf-8?B?Q2hyaXMgRmluaw==?=

    Scott Allen Guest

    Hi Chris:

    Sorry, I wasn't as clear about this as the others were, but the way
    you are building the control doesn't allow it to be instantiated
    serverside.

    --
    Scott
    http://www.OdeToCode.com/blogs/scott/

    On Fri, 15 Oct 2004 08:09:17 -0700, "Chris Fink"
    <> wrote:

    >Scott,
    >
    >All my controls are server side....
    >
    >"Scott Allen" wrote:
    >
    >>
    >> FindControl will only find server side controls (controls with a
    >> runat="server" attribute).
    >>
    >> HTH,
    >>
    >> --
    >> Scott
    >> http://www.OdeToCode.com/blogs/scott/
    >>
    >>
    >> On Fri, 15 Oct 2004 06:47:05 -0700, "Chris Fink"
    >> <> wrote:
    >>
    >> >In the below example could someone please assist in why the findcontrol
    >> >method is returning null. Is there are easy way to determine where in the
    >> >page heirarchy a control exists - I currently use the debugger and after I am
    >> >done drilling down 10 levels deep I still can't easily tell where the control
    >> >lives...
    >> >
    >> >====CODE BEHIND====
    >> >using System;
    >> >using System.Collections;
    >> >using System.ComponentModel;
    >> >using System.Data;
    >> >using System.Drawing;
    >> >using System.Web;
    >> >using System.Web.SessionState;
    >> >using System.Web.UI;
    >> >using System.Web.UI.WebControls;
    >> >using System.Web.UI.HtmlControls;
    >> >
    >> >namespace playground
    >> >{
    >> > public class tabs : System.Web.UI.Page
    >> > {
    >> > protected System.Web.UI.WebControls.Label lblFolders;
    >> >
    >> > private void Page_Load(object sender, System.EventArgs e)
    >> > {
    >> >
    >> > // build html on fly
    >> > System.Text.StringBuilder sb = new System.Text.StringBuilder();
    >> > for(int i=0;i<5;i++)
    >> > {
    >> > string id = "v2" + i.ToString().Trim();
    >> > sb.Append("<td name=\"" + id + "\" id=\"" + id + "\" bgcolor=\"#00e0\"
    >> >width=\"10\" runat=\"server\"><a href=\"tabs.aspx?folder=" + id +
    >> >"\">Folder</a></td>");
    >> > sb.Append("<td width=\"1\"></td>");
    >> > }
    >> >
    >> > lblFolders.Text=sb.ToString();
    >> >
    >> > if(Request.Params["folder"] != null)
    >> > {
    >> > highLightTab(Request.Params["folder"].ToString().Trim());
    >> > }
    >> > }
    >> >
    >> > private void highLightTab(string controlID)
    >> > {
    >> > if (controlID != null)
    >> > {
    >> > // this does not find the control
    >> > HtmlTableCell td = (HtmlTableCell)Page.FindControl(controlID);
    >> > try
    >> > {
    >> > td.BgColor="yellow";
    >> > }
    >> > catch
    >> > {
    >> > }
    >> > }
    >> > }
    >> >
    >> >
    >> > #region Web Form Designer generated code
    >> > override protected void OnInit(EventArgs e)
    >> > {
    >> > //
    >> > // CODEGEN: This call is required by the ASP.NET Web Form Designer.
    >> > //
    >> > InitializeComponent();
    >> > base.OnInit(e);
    >> > }
    >> >
    >> > /// <summary>
    >> > /// Required method for Designer support - do not modify
    >> > /// the contents of this method with the code editor.
    >> > /// </summary>
    >> > private void InitializeComponent()
    >> > {
    >> > this.Load += new System.EventHandler(this.Page_Load);
    >> > }
    >> > #endregion
    >> > }
    >> >}
    >> >
    >> >====HTML .ASPX====
    >> ><%@ Page language="c#" Codebehind="tabs.aspx.cs" AutoEventWireup="false"
    >> >Inherits="playground.tabs" %>
    >> ><HTML>
    >> > <HEAD>
    >> > <title>tabs</title>
    >> ></HEAD>
    >> > <body>
    >> >
    >> > <form id="tabs" method="post" runat="server">
    >> > <table border="1">
    >> > <tr>
    >> > <asp:Label ID="lblFolders" Runat="server"></asp:Label>
    >> > </tr>
    >> > </table>
    >> > </form>
    >> > </body>
    >> ></HTML>

    >>
    >>
     
    Scott Allen, Oct 16, 2004
    #7
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