Determining selected node in OnInit

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  • =?Utf-8?B?TWlrZSBDb2xsaW5z?=
    #1

    Determining selected node in OnInit

    In my web application, I have a treeview. Based on which node is clicked, I
    am loading user controls. Currently, I am loading my controls in the
    SelectedNodeCha nged event, but I want to load the user controls in OnInit so
    I can have them in the ViewState, but the treeview is not created yet. Is
    this possible, or do I need to keep loading my user controls after the OnInit
    event?

    Example of what I am doing now:
    protected void tvAccountSetup_ SelectedNodeCha nged(object sender, EventArgs e)
    {
    AddControl(@"Us erControls\" + tvAccountSetup. ID.Substring(2) + @"\" +
    tvAccountSetup. SelectedValue + ".ascx");
    }

    private void AddControl(stri ng control)
    {
    //In case the page cannot be found, with this code in a try catch, it will
    not error.
    try
    {
    PlaceHolder1.Co ntrols.Clear();
    Control c = Page.LoadContro l(control);
    PlaceHolder1.Co ntrols.Add(c);
    }
    catch
    {
    }

    Tags: None
    • Gaurav Vaish \(a.k.a. MasterGaurav\)
      #2
      Re: Determining selected node in OnInit

      am loading user controls. Currently, I am loading my controls in the
      SelectedNodeCha nged event, but I want to load the user controls in OnInit
      so
      I can have them in the ViewState, but the treeview is not created yet. Is
      Why would you need that?
      The events have been structured in such a manner that you don't need to do
      all that juggling.

      Is there any specific reason as to why you need to "load" the controls
      during "OnInit"?
      btw, you don't need to "load" them in OnInit to participate in ViewState.

      They must be added in the method AddChildControl s().


      HTH.


      --
      Happy Hacking,
      Gaurav Vaish | http://dwt.sourceforge.net
      http://blogs.mastergaurav.com | http://eduzine.edujini-labs.com
      --------------------------------




        Comment

        • Eliyahu Goldin
          #3
          Re: Determining selected node in OnInit

          Request.Form collection is available in OnInit event. Set a breakpoint on
          the event, look into the Request.Form and see if it contains any info that
          you can use.

          --
          Eliyahu Goldin,
          Software Developer
          Microsoft MVP [ASP.NET]
          http://msmvps.com/blogs/egoldin

          http://usableasp.net



          "Mike Collins" <MikeCollins@di scussions.micro soft.comwrote in message
          news:358E9A68-FE05-4830-9310-7C44EBC488E9@mi crosoft.com...
          In my web application, I have a treeview. Based on which node is clicked,
          I
          am loading user controls. Currently, I am loading my controls in the
          SelectedNodeCha nged event, but I want to load the user controls in OnInit
          so
          I can have them in the ViewState, but the treeview is not created yet. Is
          this possible, or do I need to keep loading my user controls after the
          OnInit
          event?
          >
          Example of what I am doing now:
          protected void tvAccountSetup_ SelectedNodeCha nged(object sender, EventArgs
          e)
          {
          AddControl(@"Us erControls\" + tvAccountSetup. ID.Substring(2) + @"\" +
          tvAccountSetup. SelectedValue + ".ascx");
          }
          >
          private void AddControl(stri ng control)
          {
          //In case the page cannot be found, with this code in a try catch, it will
          not error.
          try
          {
          PlaceHolder1.Co ntrols.Clear();
          Control c = Page.LoadContro l(control);
          PlaceHolder1.Co ntrols.Add(c);
          }
          catch
          {
          }
          >

            Comment

            • =?Utf-8?B?TWlrZSBDb2xsaW5z?=
              #4
              Re: Determining selected node in OnInit

              Why would you need that?

              I thought that when you dynamically load controls, you were supposed to do
              that in OnInit so the control would be part of the pages ViewState. This way
              if the page gets refreshed, the control will not disappear. I will look into
              the AddChildControl s method. Thanks.

              "Gaurav Vaish (a.k.a. MasterGaurav)" wrote:
              am loading user controls. Currently, I am loading my controls in the
              SelectedNodeCha nged event, but I want to load the user controls in OnInit
              so
              I can have them in the ViewState, but the treeview is not created yet. Is
              >
              Why would you need that?
              The events have been structured in such a manner that you don't need to do
              all that juggling.
              >
              Is there any specific reason as to why you need to "load" the controls
              during "OnInit"?
              btw, you don't need to "load" them in OnInit to participate in ViewState.
              >
              They must be added in the method AddChildControl s().
              >
              >
              HTH.
              >
              >
              --
              Happy Hacking,
              Gaurav Vaish | http://dwt.sourceforge.net
              http://blogs.mastergaurav.com | http://eduzine.edujini-labs.com
              --------------------------------
              >
              >
              >
              >
              >

                Comment

                • =?Utf-8?B?TWlrZSBDb2xsaW5z?=
                  #5
                  Re: Determining selected node in OnInit

                  Thanks...I'll look into that.

                  "Eliyahu Goldin" wrote:
                  Request.Form collection is available in OnInit event. Set a breakpoint on
                  the event, look into the Request.Form and see if it contains any info that
                  you can use.
                  >
                  --
                  Eliyahu Goldin,
                  Software Developer
                  Microsoft MVP [ASP.NET]
                  http://msmvps.com/blogs/egoldin

                  http://usableasp.net

                  >
                  >
                  "Mike Collins" <MikeCollins@di scussions.micro soft.comwrote in message
                  news:358E9A68-FE05-4830-9310-7C44EBC488E9@mi crosoft.com...
                  In my web application, I have a treeview. Based on which node is clicked,
                  I
                  am loading user controls. Currently, I am loading my controls in the
                  SelectedNodeCha nged event, but I want to load the user controls in OnInit
                  so
                  I can have them in the ViewState, but the treeview is not created yet. Is
                  this possible, or do I need to keep loading my user controls after the
                  OnInit
                  event?

                  Example of what I am doing now:
                  protected void tvAccountSetup_ SelectedNodeCha nged(object sender, EventArgs
                  e)
                  {
                  AddControl(@"Us erControls\" + tvAccountSetup. ID.Substring(2) + @"\" +
                  tvAccountSetup. SelectedValue + ".ascx");
                  }

                  private void AddControl(stri ng control)
                  {
                  //In case the page cannot be found, with this code in a try catch, it will
                  not error.
                  try
                  {
                  PlaceHolder1.Co ntrols.Clear();
                  Control c = Page.LoadContro l(control);
                  PlaceHolder1.Co ntrols.Add(c);
                  }
                  catch
                  {
                  }
                  >
                  >
                  >

                    Comment

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