Question

i have a gridview inside a repeater, and a dropdownlist insid the gridview. now i want no user can select one value twice.my code is

<asp:Repeater ID="rep_test" runat="server">
    <ItemTemplate>
       <asp:GridView ID="grd_test" runat="server" Style="text-align: center;
                width: 375px;" AutoGenerateColumns="false">
                <Columns>
                    <asp:BoundField HeaderText="hello" DataField="hello" />
                </Columns>
                <Columns>
                    <asp:BoundField HeaderText="item" DataField="item" />
                </Columns>
                <Columns>                        
                    <asp:TemplateField HeaderText="Assign to">
                        <ItemTemplate>
                            <asp:DropDownList ID="drp_Assign" runat="server">
                                <asp:ListItem Value="1"> 1</asp:ListItem>
                                <asp:ListItem Value="2">2</asp:ListItem>
                                <asp:ListItem Value="3">3</asp:ListItem>
                            </asp:DropDownList>
                        </ItemTemplate>
                    </asp:TemplateField>
                </Columns>
            </asp:GridView>
            <asp:DropDownList ID="drp_Address" runat="server">
            </asp:DropDownList>
    </ItemTemplate>
</asp:Repeater>

i want to detect the duplicate value for drodown “drp_Assign”.

please see the image the values in comp number should not be duplicate if a user selected “1” for one row then he will not be able to selected same value in second row . if he tries to do then alert message will be shown that you have selected this value already choose another.”

Answer 1

I am using the repeater as the container, #rep_test, and matching all dropdowns inside the container so that user can’t select same values.

NOTE : Double check your Repeater ID in your browser as .Net will change it.

UNLESS you change your Client ID Mode to static [.Net 4.0], e.g. :

<asp:Repeater ID="rep_test" runat="server" ClientIDMode="Static">

REF : http://weblogs.asp.net/asptest/archive/2009/01/06/asp-net-4-0-clientid-overview.aspx

JQuery:

 $(function() {

    $('#rep_test select').live('change',function(event) {
        var cI = $(this);
        $('#rep_test select option:selected').each(function(i, e) {
            //Check if values match AND if not default AND not match changed item to self
            if ($(e).val() == cI.val() && $(e).val() != 0 && $(e).parent().index() != cI.index()) {

                alert('Duplicate found!');
                cI.val('0');
            }
        });
    });

});

WORKING EXAMPLE : http://jsfiddle.net/zrcZM/2