javascript 取datalist中checkboxlis值,并判断是否选择了。

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document.getElementById('checkbox1').value ='on'
<asp:Panel ID="pnlSurvey" runat="server" Visible="False">
                <asp:DataList ID="lstSurvey" runat="server" CellPadding="4" DataKeyField="SurveyId"
                    CssClass="survey">
                    <ItemTemplate>
                        <asp:HyperLink ID="cmdEdit2" ImageUrl="~/images/edit.gif" NavigateUrl='<%# EditURL("SurveyId",DataBinder.Eval(Container.DataItem,"SurveyId")) %>'
                            Visible="<%# IsEditable %>" runat="server" />
                        <asp:Label ID="QuestionLabel" runat="server" Text='<%# Eval("Question") %>' CssClass="NormalBold"></asp:Label><br />
                        <asp:RadioButtonList ID="optOptions" runat="server" CssClass="Normal">
                        </asp:RadioButtonList>
                        <asp:CheckBoxList ID="chkOptions" runat="server" CssClass="Normal">
                        </asp:CheckBoxList><br />
                        <asp:textbox id="txtAnswer" runat="server" cssclass="NormalTextBox" textmode="MultiLine" rows="3"
maxlength="500" width="300px" Visible =false></asp:textbox>
<asp:CustomValidator ID="CustomValidator1"
ControlToValidate="chkOptions" ClientValidationFunction=ClientValidateOption
                    runat="server" ErrorMessage="CustomValidator"></asp:CustomValidator>
                        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" ControlToValidate="txtAnswer" runat="server" ErrorMessage="RequiredFieldValidator" Display=Static></asp:RequiredFieldValidator>
                    </ItemTemplate>

                    <ItemStyle CssClass="surveyitems" />
                </asp:DataList>
                <asp:LinkButton ID="cmdSubmit" runat="server" resourcekey="cmdSubmit" CssClass="CommandButton">Submit Survey</asp:LinkButton> 
                <asp:LinkButton ID="cmdResults" runat="server" resourcekey="cmdResults" CssClass="CommandButton">View Results</asp:LinkButton></asp:Panel>
我要看看chkOptions时候都被选中了。  怎么办啊
js方法里 for()可不可以？
如果是document.getElementById('checkbox1').value ='on'
...
whitechololate
能说的再明白一点吗？