使用javascript验证动态生成的复选框

Question

我正在编写一个程序，在其中我从数据库中检索数据，并在结果集中获得n行数。基于我已动态生成每行的复选框的行数。现在我想验证这种形式，场景就像这样“如果用户没有选中任何复选框”程序应该生成错误（警报）。我想要js功能。

while(disciterator.hasNext()) 
        {

           temp=(String)disciterator.next().toString() ;               
            st= new StringTokenizer(temp,"$");          
            enrollment_no = st.nextToken();              


            ExamBean examb = new ExamBean(dbConnVar);




        personal_details=examb.getPersonalDetails(enrollment_no); 

         if(!(personal_details.isEmpty()))
          {
                 st=new StringTokenizer(personal_details,"$");
                firstName1 = st.nextToken();                    
                lastName = st.nextToken();              //  
                address = st.nextToken();                   
                phone = st.nextToken();             //  
                email = st.nextToken();             //  
                gender = st.nextToken();    

                mothers_name = st.nextToken();              //  
                fathers_name = st.nextToken();              //  
                temporary_address =st.nextToken();


         }//end if
         else
         {

         } 

％GT;

<tr>    
                                <td class="MTTD8" align="center"><input type="checkbox" name="MigrationCHK" id="MigrationCHK" value="<%=enrollment_no%>" onclick="uncheckSelectAll()"></td>
                                <td align="center" class="MTTD2"  > <font size=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<%=enrollment_no%> </font></td>
                                <td class="MTTD2" > <font size=2><%=firstName1%> <%=lastName %></font></td>
                                  <td class="MTTD2" ><font size=2><input type="text" name="<%=i%>mcno" /></font></td>
                            </tr>

  <%    
  i++;
  }
  %>