Server Control dynamic access RSS

• • Reply
  •  
  

  allenrajiev

  Member

  95 Points

  83 Posts

  Server Control dynamic access

  Feb 21, 2007 06:01 AM|LINK

  Hi All,

  I have the names of Some server controls in string variables. It can be textbox or linkbutton or button or anything.

  I want to hide these controls depending on some conditions.

  How can i get access to these controls. I am using master page. But these controls are in content page.

  I tried, this.page.Findcontrol(ctrName) , but its returning null, though its very much there in the page. I can access this controls using this.btnSave and all, but I cant use this.ctrName, being ctrName a string.

  Also is there any way to cast anytype of Control to a common contol?

  What if i am having some controls in User controls, what If  I am having some custom controls. how will i access, controls inside that in present page.

   

  Thanks for tyhe help

• • Reply
  •  
  

  Haissam

  All-Star

  37421 Points

  5632 Posts

  Re: Server Control dynamic access

  Feb 21, 2007 06:56 AM|LINK

  The common control to cast is the Control object

  Control ctr = (Control)Page.FindControl("CONTROLID")

  try to look into the below link

  MasterPage And Page.FindControl

  HC
  

   

  Haissam Abdul Malak
  MCAD.NET
  | Blog |
• • Reply
  •  
  

  allenrajiev

  Member

  95 Points

  83 Posts

  Re: Server Control dynamic access

  Feb 21, 2007 07:03 AM|LINK

  But when i try to find Page.FindControl("ControlId") i am getting null. I have no idea why is that happening. Any idea about that.
• • Reply
  •  
  

  XOR_

  Member

  418 Points

  110 Posts

  Re: Server Control dynamic access

  Feb 21, 2007 07:09 AM|LINK

  can u post some of ur code in front?
  
• • Reply
  •  
  

  XOR_

  Member

  418 Points

  110 Posts

  Re: Server Control dynamic access

  Feb 21, 2007 07:09 AM|LINK

  can u post some of ur aspx page code.
  
• • Reply
  •  
  

  allenrajiev

  Member

  95 Points

  83 Posts

  Re: Server Control dynamic access

  Feb 21, 2007 07:13 AM|LINK

  <asp:Content ContentPlaceHolderID="contentBody" ID="body" runat="server">

  <table style="background-color:whitesmoke">

  <tr>

  <td colspan="6">

  <uc2:DriverSearch ID="_driverSearch" runat="server" />

   

  </td>

  </tr>

  <tr>

  <td>

  <asp:Label ID="Label1" runat="server" Text="Driver Lic. Number:"></asp:Label>

  </td>

  <td>

  <asp:TextBox ID="txtDriversLicense" Width="150px" runat="server"></asp:TextBox>

  </td>

  <td>

  <asp:Label ID="Label2" runat="server" Text="State:"></asp:Label>

  </td>

  <td>

  <asp:TextBox ID="txtState" Width="30px" runat="server"></asp:TextBox>

  </td>

  <td>

  <asp:Label ID="Label3" runat="server" Text="License Exp. Date:"></asp:Label>

  </td>

  <td>

  <cc1:CalendarPopup ID="calLicenseExpiration" runat="server">

  </cc1:CalendarPopup>

  </td>

  </tr>

  <tr>

  <td>

  <asp:Label ID="Label4" runat="server" Text="Physical Date:"></asp:Label>

  </td>

  <td>

  <cc1:CalendarPopup ID="calPhysicalDate" runat="server">

  </cc1:CalendarPopup>

  </td>

  <td>

  </td>

  <td>

  </td>

  <td>

  <asp:Label ID="Label5" runat="server" Text="Physical Exp. Date:"></asp:Label>

  </td>

  <td >

  <cc1:CalendarPopup ID="calPhysicalExpiration" runat="server">

  </cc1:CalendarPopup>

  </td>

  </tr>

  <tr>

  <td>

  <asp:Label ID="Label6" runat="server" Text="Hazmat Qualification"></asp:Label>

  </td>

  <td>

  <asp:DropDownList ID="lstHazmatQualification" runat="server">

  <asp:ListItem Value="Y" Text="Yes"></asp:ListItem>

  <asp:ListItem Value="N" Text="No"></asp:ListItem>

  </asp:DropDownList>

  </td>

  <td>

  </td>

  <td>

  </td>

  <td>

  <asp:Label ID="Label7" runat="server" Text="Hazmat Exp. Date:"></asp:Label>  --- its here

  </td>

  <td>

  <cc1:CalendarPopup ID="calHazmatExpiration" runat="server">

  </cc1:CalendarPopup>

  </td>

  </tr>

  <tr>

  <td colspan="6">

  <uc1:grdLicenseEndorsements ID="_grdLicenseEndorsements" runat="server" />

   

  </td>

  </tr>

  <tr>

  <td colspan="6" align="center">

  <table>

  <tr>

  <td>

  <cc2:SaveButton ID="cmdSave" runat="server" OnClick="cmdSave_Click"></cc2:SaveButton>

  </td>

  <td>

  <cc2:ResetButtonServer ID="cmdReset" runat="server"></cc2:ResetButtonServer>

  </td>

  <td>

  <cc2:CancelButton ID="cmdCancel" runat="server"></cc2:CancelButton>

  </td>

  </tr>

  </table>

  </td>

  -------------------------------

  string controlsToHide = objControls.GetControlsToHide(SiteMap.CurrentNode.Url.ToString(), group);

  if (this.FindControl("Label7") != null)     --------- here I am getting null

  {

  int a = 10;

  }

  if (controlsToHide.Trim() != "" && controlsToHide != null)

  {

  string[] splitList = controlsToHide.Split(';');

  for (int l = 0; l < splitList.Length; l++)

  {

  switch (splitList[l].ToString())

  {

  case "cmdSave":

  this.cmdSave.Visible = false;

  break;

  case "cmdReset":

  this.cmdReset.Visible = false;

  break;

  case "cmdCancel":

  this.cmdCancel.Visible = false;

  break;

  default:

  break;

  }

  if (this.FindControl(splitList[l]) != null)

  {

  this.FindControl(splitList[l].ToString()).Visible = false;

  }

  }

  }

  }

  will this much code be enough? Please let me know if u need full code of aspx n cs

• • Reply
  •  
  

  XOR_

  Member

  418 Points

  110 Posts

  Re: Server Control dynamic access

  Feb 21, 2007 07:23 AM|LINK

  because ur control exist in a content place holder try

  body.FindControl(name);
  

• • Reply
  •  
  

  allenrajiev

  Member

  95 Points

  83 Posts

  Re: Server Control dynamic access

  Feb 21, 2007 08:16 AM|LINK

  when i do this.FindControl("body") or Page.findControl("body") i am getting null..so I am not able to use body.FindControl.. Is there any other method to access a control inside a Content Place holder
• • Reply
  •  
  

  allenrajiev

  Member

  95 Points

  83 Posts

  Re: Server Control dynamic access

  Feb 21, 2007 09:03 AM|LINK

  http://www.codeproject.com/aspnet/InsideMasterPages.asp?df=100&forumid=208804&exp=0&select=1375274

  
  To get a control in the <childMaster> page, it’s a bit tricky but
  keep in mind two thingsAll controls are in the topmost master page.
  Controls that belong to child master pages are in the appropriate
  ContentPlaceHolder control in the topmost master page. Now take a look at the trace output and check this code snippet below

  Button btn =
    myChildMaster.Master.FindControl("ContentPlaceHolder1").FindControl("button1")
    as Button;
  btn.Text = "by the content page";

   

  This will help and it worked for me..Thank you all..

• • Reply
  •  
  

  jbeall

  Participant

  813 Points

  273 Posts

  Re: Server Control dynamic access

  Mar 16, 2007 01:36 PM|LINK

  I decided to go with recursive lookups.  Rick Strahl has a code snippet demonstrating how to do this.  I simply overrode the FindControl method to use recursive lookups if it couldn't find the control on the first pass.

  Rick expressed some concern about performance, but from the limited amount of benchmarking I've done, it seems to be be fine (see my comment on his blog; search for "Beall").  But do your own due diligence, of course, and make sure you're happy with the performance.
  

  http://www.west-wind.com/WebLog/ShowPost.aspx?id=5127
  
  

    -Josh
   

  -jb