Dynamic generated page controls not found.

Question

1.06/5 (4 votes)

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I am unable to found Page controls (Check boxes,Radio button,Images).
Please help me.my code is below.

HTML

ASP.NET

<div id="divLeftpane"   runat="server" class="product-left-menu"></div>

C#

private void PopulateLeftSearchPane()
    {

        SearchDataContext objGetAspects = new SearchDataContext(CommonFunctions.getConnectionString());
        var Aspects = from c in objGetAspects.RV_GetAspects()
                      select new
                      {
                          c.AspectName,
                          c.AspectID,
                          c.AspectContext,
                          c.AspectDescription,
                          c.AspectType

                      };
        if (Aspects != null)
        {

            Button button = new Button();

            foreach (var cn in Aspects)
            {

                //open div group menu
                HtmlGenericControl divgroupmenu = new System.Web.UI.HtmlControls.HtmlGenericControl("divgroupmenu");
                divgroupmenu.Attributes.Add("class", "group-menu");

                //open div accordion heading
                HtmlGenericControl divaccordionheading = new System.Web.UI.HtmlControls.HtmlGenericControl("divaccordionheading");
                divaccordionheading.Attributes.Add("class", "accordion-heading");

                //Add Hyperlink for header
                HtmlAnchor hlheader = new HtmlAnchor();
                hlheader.HRef = "#";
                hlheader.InnerText = cn.AspectName;

                divaccordionheading.Controls.Add(hlheader);

                //open div accordion inner
                HtmlGenericControl divaccordioninner = new System.Web.UI.HtmlControls.HtmlGenericControl("divaccordioninner");
                divaccordioninner.Attributes.Add("class", "accordion-inner");

               ShowData(cn.AspectID, cn.AspectName,cn.AspectDescription, cn.AspectContext, cn.AspectType, divgroupmenu, divaccordionheading, divaccordioninner);


            }

        }

    }
    public void ShowData(Int64 AspectID, String strAspectName,String strAspectDescription, String strAspectContext, String strAspectType, HtmlGenericControl divgroupmenu, HtmlGenericControl divaccordionheading, HtmlGenericControl divaccordioninner)
    {

        Literal lculopen = new Literal();
        lculopen.Text = String.Empty;
        if (strAspectContext == "CHECK")
        {
            lculopen.Text = "<ul class="stone-type leftdrop">";
        }
        else if (strAspectContext == "OPTION")
        {
            lculopen.Text = "<ul class="ring-style leftdrop">";
        }
        else if (strAspectContext == "IMAGEMANY"  && strAspectDescription.Contains("SEQURE"))
        {
            lculopen.Text = "<ul class="sequremultiple leftdrop">";
        }
        else if (strAspectContext == "IMAGESINGLE" && strAspectDescription.Contains("SEQURE"))
        {
            lculopen.Text = "<ul class="sequresingle leftdrop">";
        }
        else if (strAspectContext == "IMAGEMANY"  && strAspectDescription.Contains("CIRCLE"))
        {
            lculopen.Text = "<ul class="circlemultiple leftdrop">";
        }
        else if (strAspectContext == "IMAGESINGLE" && strAspectDescription.Contains("CIRCLE"))
        {
            lculopen.Text = "<ul class="circlesingle leftdrop">";
        }
        else
        {
            lculopen.Text = "<ul class="stone-type leftdrop">";
        }

        divaccordioninner.Controls.Add(lculopen);

        SearchDataContext objGetAspects = new SearchDataContext(CommonFunctions.getConnectionString());
        var Aspects = from c in objGetAspects.RV_GetTraitValue(AspectID)
                      select new
                      {
                          c.AspectID,
                          c.TraitID,
                          c.ValueName
                      };


        foreach (var cn in Aspects)
        {

            if (strAspectContext == "CHECK")
            {
                Literal lcliopen = new Literal();
                lcliopen.Text = "<li>";
                divaccordioninner.Controls.Add(lcliopen);

                UpdatePanel myupdpnl = new UpdatePanel();
                myupdpnl.ID = "upnl" + cn.AspectID + "_" + cn.TraitID;

                CheckBox chk = new CheckBox();
                chk.ID = "chktrait" + cn.AspectID + "_" + cn.TraitID;
                //string uniqueID = System.Guid.NewGuid().ToString().Substring(0, 5);
                chk.Text = cn.ValueName;
                chk.Attributes.Add("AspectID", cn.AspectID.ToString());
                chk.Attributes.Add("TraitID", cn.TraitID.ToString());
                chk.AutoPostBack = false;
                //CheckBox chk = (CheckBox)ctrl;
              //  chk.CheckedChanged += new EventHandler(CheckBox_CheckChanged);
               // chk.CheckedChanged += new EventHandler(this.CheckBox_Click);
                chk.Attributes.Add("onchange", "Javascript:return CallSearchResults('"+ chk.ID  + "','"  + cn.AspectID +  "','"  + cn.TraitID + "','"  + cn.ValueName + "'"    + ");");
                myupdpnl.ContentTemplateContainer.Controls.Add(chk);
                //myupdpnl.ContentTemplateContainer.Controls.Add(chk);

                //divaccordioninner.Controls.Add(chk);
                divaccordioninner.Controls.Add(myupdpnl);


                Literal lcliclose = new Literal();
                lcliclose.Text = "</li>";
                divaccordioninner.Controls.Add(lcliclose);

            }
            else if (strAspectContext == "OPTION")
            {
                Literal lcliopen = new Literal();
                lcliopen.Text = "<li>";
                divaccordioninner.Controls.Add(lcliopen);

                RadioButton rdbtn = new RadioButton();
                rdbtn.ID = "rdbtntrait" + cn.AspectID + "_" + cn.TraitID;
                rdbtn.Text = cn.ValueName;
                rdbtn.AutoPostBack = false;
                rdbtn.GroupName = "rdbtntrait" + cn.AspectID;
                divaccordioninner.Controls.Add(rdbtn);

                Literal lcliclose = new Literal();
                lcliclose.Text = "</li>";
                divaccordioninner.Controls.Add(lcliclose);

            }
            else if (strAspectContext == "IMAGEMANY")
            {

                Literal lcliopen = new Literal();
                lcliopen.Text = "<li>";
                divaccordioninner.Controls.Add(lcliopen);

                //Add Hyperlink 
                HtmlAnchor htmlanchor = new HtmlAnchor();
                //htmlanchor.HRef = "#";

                Image img = new Image();
                img.ID = "imgtrait" + cn.AspectID + "_" + cn.TraitID;
                img.AlternateText = cn.ValueName;
                htmlanchor.Controls.Add(img);

                CommonFunctions objCommonFunctions = new CommonFunctions();
                String StrAspectIDTraitID = cn.AspectID + "-" + cn.TraitID;
                String imgtraitcons = CommonFunctions.searchImageFromBlob(StrAspectIDTraitID, objCommonFunctions.GetSystemVariables(CommonFunctions.SystemVariables.DataConnectionString), objCommonFunctions.GetSystemVariables(CommonFunctions.SystemVariables.traitconContainer)); //searchImageFromBlob(cn.ContentID.ToString());
                img.ImageUrl = imgtraitcons;
                divaccordioninner.Controls.Add(htmlanchor);
             
                Literal lcliclose = new Literal();
                lcliclose.Text = "</li>";
                divaccordioninner.Controls.Add(lcliclose);


            }
            else if (strAspectContext == "IMAGESINGLE")
            {

                Literal lcliopen = new Literal();
                lcliopen.Text = "<li>";
                divaccordioninner.Controls.Add(lcliopen);

                //Add Hyperlink 
                HtmlAnchor htmlanchor = new HtmlAnchor();
                //htmlanchor.HRef = "#";

                Image img = new Image();
                img.ID = "imgtrait" + cn.AspectID + "_" + cn.TraitID;
                img.AlternateText = cn.ValueName;
                htmlanchor.Controls.Add(img);

                CommonFunctions objCommonFunctions = new CommonFunctions();
                String StrAspectIDTraitID = cn.AspectID + "-" + cn.TraitID;
                String imgtraitcons = CommonFunctions.searchImageFromBlob(StrAspectIDTraitID, objCommonFunctions.GetSystemVariables(CommonFunctions.SystemVariables.DataConnectionString), objCommonFunctions.GetSystemVariables(CommonFunctions.SystemVariables.traitconContainer)); //searchImageFromBlob(cn.ContentID.ToString());
                img.ImageUrl = imgtraitcons;
                divaccordioninner.Controls.Add(htmlanchor);
              
                Literal lcliclose = new Literal();
                lcliclose.Text = "</li>";
                divaccordioninner.Controls.Add(lcliclose);


            }
            else
            {

            }

        }

        Literal lculclose = new Literal();
        lculclose.Text = "</ul>";
        divaccordioninner.Controls.Add(lculclose);
        //close div divaccordionheading
        divaccordionheading.Controls.Add(divaccordioninner);
        //close div divgroupmenu
        divgroupmenu.Controls.Add(divaccordionheading);
        //close div divLeftpane
        divLeftpane.Controls.Add(divgroupmenu);
    }

    private void ProcessControls(Control ctrlContainer)
    {
        foreach (Control ctrl in ctrlContainer.Controls)
        {
            if (ctrl.GetType() == typeof(TextBox))
            {
                // Do whatever to the TextBox
            }

            else if (ctrl.GetType() == typeof(CheckBox))
            {
                // Do whatever to the TextBox
                Response.Write(ctrl.UniqueID);

               
               
            }
            else if (ctrl.GetType() == typeof(RadioButton))
            {
                // Do whatever to the TextBox
            }
            else if (ctrl.GetType() == typeof(Image))
            {
                // Do whatever to the TextBox
            }

            if (ctrl.HasControls())
                ProcessControls(ctrl);
        }
    }

protected void btnSearchResult_Click(object sender, EventArgs e)
   {

       ProcessControls(divLeftpane);
      // PopulateLeftSearchPane();
   }

Posted 21-Jul-14 0:49am

piyushpiyush

Updated 21-Jul-14 2:04am

SRS(The Coder)

v2

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Comments

ZurdoDev 21-Jul-14 7:58am

1. This is way too much code for someone to try and help you.
2. I assume this is ASP.Net? If so, dynamic controls should be created in the OnInit event of the page.

SRS(The Coder) 21-Jul-14 8:05am

Too much of code to understand and give solution.
Please write small summary of all.

GregWyatt 22-Jul-14 16:51pm

I would like to second RyanDev's statement that any dynamically added controls need to be done in the OnInit event. Below is a link to an article that discusses the asp.net life cycle, viewstate, and has a special section that explains some of the tricks with dynamically adding controls(how they maintain state across postbacks). http://msdn.microsoft.com/en-us/library/ms972976.aspx Its a long read, but if you are going to do dynamic controls it is worth it to understand what is happening.

member33 22-Jul-14 17:03pm

I think you are loosing controls on post backs .. Dymanic controls cannot retain state after post back .. you will have to save them in a view state and regenerate on every post back

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member33 · Accepted Answer · 2014-07-22T11:10:00

Solution 2

look at this

http://techbrij.com/create-dynamic-dropdownlists-in-asp-net[^]

Posted 22-Jul-14 11:10am

member33