Question

How to add JavaScript on ASP.NET Dropdownlist, pass that Dropdownlist Id to that same JavaScript function which is called? How to do the same for Dropdownlist which is a template field of Gridview?

Answer 1

You can add onchange event in dropdown if you do not need anything from database/server end

<ItemTemplate> <asp:DropDownList ID="DropDownList1" runat="server" onchange="BindEng(this);" Height="16px" Width="179px"> <ItemTemplate>

Add RowDataBound event to gridview and access dropdown for each row and assign javascript to it, here you can access data of datasource if required for javascript function.

protected void GrdViewUsers_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if(e.Row.RowType == DataControlRowType.DataRow)
    {
        DropDownList ddl = e.Row.FindControl("YourDropDownListID") as DropDownList;
        //The statment below will pass the client id of drop down to function in javascript
        ddl.Attributes.Add("onchange", "YourjavascriptMethodCall('" + ddl.ClientID + "'");
    }
}