I have checkBoxes in my Gridview templete columns called "Category A" and "Category B". I want Select-All functionality, i.e. when the user checks the Select-All check Box in category A column, all the checkboxes must get checked under that column. Same for Category B. I am trying with the code below. The problem with my code is, it selects all the check boxes in the entire gridview, "Category A" as well as "Category B"s checkboxes. But, I want only checkboxes selected under the same column.

 function SelectAllCheckboxesA(chk) {
                $('#<%=gvSurveys.ClientID %>').find("input:checkbox").each(function() {
                    if (this != chk) {
                        if ($(this).hasClass('CatA') != false) {
                            this.checked = chk.checked;
                        }
                    }
                    else {
                        alert($(this));
                    }
                });
            }




 <asp:GridView ID="gvSurveys" runat="server" AutoGenerateColumns="false" AllowSorting="True" Width="1500px">
                           <Columns>
                              <asp:TemplateField>
                                 <HeaderTemplate>Category A
    <asp:CheckBox ID="chkSelectAllCatA" runat="server" Visible="false" onclick="javascript:SelectAllCheckboxesA(this);" CssClass="SACatA" />
    </HeaderTemplate>
    <ItemTemplate>
    <asp:CheckBox ID="chkCatA" runat="server" Enabled="false" CssClass="CatA"  />
    </ItemTemplate>
    </asp:TemplateField>
    <asp:TemplateField>
    <HeaderTemplate>
    Category B
    <asp:CheckBox ID="chkSelectAllCatB" runat="server" Visible="false" CssClass="CatB" onclick="javascript:SelectAllCheckboxesB(this);" />
    </HeaderTemplate>
    <ItemTemplate>
    <asp:CheckBox ID="chkCatB" runat="server" Enabled="false" />
    </ItemTemplate>
    </asp:TemplateField>
    </Columns>
    </asp:GridView>