Column sum of multiple columns of dynamic gridview using Javascript
<p>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.</p>

<p>Please find code below</p>

<pre><code>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;
    }
}
</code></pre>

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

<pre><code> //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 &lt; textboxs.length; i++)
       {
           sum += parseFloat(textboxs[i].value);
       }
       var textboxtotalqtys = row.getElementsByClassName("ColorTotal");
       textboxtotalqtys[0].value = sum.toString();         

   }
</code></pre>

<p>And the result is Like below
<a href="https://i.stack.imgur.com/tFhZC.png" rel="noreferrer"><img src="https://i.stack.imgur.com/tFhZC.png" alt="enter image description here"></a></p>

<p>can anyone please help me in finding out the sum of each columns(all same cssclass).and display it in the Sizetotal row because I am not able to loop through columns</p>