Column sum of multiple columns of dynamic gridview using javascript

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Javascript

C#3.5

Gridview

I have a Dynamic asp Gridview with all columns as template feild TextBox. The columns of the Gridview are also dynamic and column count may vary everytime.

Please find code below

public void FillPoDetails()
       {

           DataTable dt = new DataTable();

           dt = pmdata.createdatatable(int.Parse(Session["OurStyleid"].ToString()), int.Parse(Session["PoPackid"].ToString()));



        GenerateTable(dt.Columns.Count, dt.Rows.Count,dt);

           foreach (DataColumn col in dt.Columns)
           {
               //Declare the bound field and allocate memory for the bound field.
               TemplateField bfield = new TemplateField();

               //Initalize the DataField value.
               bfield.HeaderTemplate = new ArtWebApp.Controls.GridViewTemplate(ListItemType.Header, col.ColumnName);

               //Initialize the HeaderText field value.
               bfield.ItemTemplate = new ArtWebApp.Controls.GridViewTemplate(ListItemType.Item, col.ColumnName);

               //Add the newly created bound field to the GridView.
               GrdDynamic.Columns.Add(bfield);
           }



           GrdDynamic.DataSource = dt;
           GrdDynamic.DataBind();

       }
      public GridViewTemplate(ListItemType type, string colname)
           {
               //Stores the template type.
               _templateType = type;

               //Stores the column name.
               _columnName = colname;
           }

       void ITemplate.InstantiateIn(System.Web.UI.Control container)
           {
               switch (_templateType)
               {
                   case ListItemType.Header:
                       //Creates a new label control and add it to the container.
                       Label lbl = new Label();            //Allocates the new label object.
                       lbl.Text = _columnName;
                       lbl.CssClass = "Headerclass";
                           //Assigns the name of the column in the lable.
                       container.Controls.Add(lbl);        //Adds the newly created label control to the container.
                       break;

                   case ListItemType.Item:
                       //Creates a new text box control and add it to the container.
                       TextBox tb1 = new TextBox();                            //Allocates the new text box object.
                       tb1.DataBinding += new EventHandler(tb1_DataBinding);   //Attaches the data binding event.
                       tb1.Columns =6;                                        //Creates a column with size 4.
                                                                              // tb1.Width = System.Web.UI.WebControls.Unit.Percentage(100);
                       tb1.Width = 100;
                       tb1.Wrap = true;
                       tb1.ID = "txt_" + _columnName;
                       if(_columnName== "ColorTotal")
                       {
                           tb1.CssClass = "ColorTotal";
                       }
                       else if (_columnName == "Color")
                       {
                           tb1.CssClass = "Color";
                       }
                       else
                       {
                           tb1.CssClass = "txtCalQty";
                           tb1.Attributes.Add("onkeypress", "return isNumberKey(event,this)");
                           tb1.Attributes.Add("onkeyup", "sumofQty(this)");
                       }

                       container.Controls.Add(tb1);                            //Adds the newly created textbox to the container.

                       break;


               }
           }

And inorder to get the row total I had added a Javascript function on keydown event and its working clearly

//calculate the sum of qty on keypress
       function sumofQty(objText) {
       
        
           var cell = objText.parentNode;
           
           var row = cell.parentNode;

           var sum = 0;
           var textboxs = row.getElementsByClassName("txtCalQty");

           for (var i = 0; i < textboxs.length; i++)
           {
               sum += parseFloat(textboxs[i].value);
           }
           var textboxtotalqtys = row.getElementsByClassName("ColorTotal");
           textboxtotalqtys[0].value = sum.toString();         

       }

can anyone please help me in finding out the sum of each columns(all same cssclass).and display it in the Sizetotal row because

What I have tried:

I am not able to loop through columns

//calculate the sum of qty on keypress
       function sumofQty(objText) {
       
        
           var cell = objText.parentNode;
           
           var row = cell.parentNode;

           var sum = 0;
                

       }