读取gridview控件中radio的值？

Question

<script       language=   "javascript   "       type=   "text/javascript   "       >   
                                function       checkif()   
                                {   
                                                        var       str       =       document.getelementbyname(   "MyRadioButton ").value;                                                           if(str!=null)   
                                                        {   
                                                                return       confirm(   "确定删除？   ");   
                                                        }   
                                                        else   
                                                        {   
                                                                    alert(   "请选择一项   ");   
                                                                    return       false;   
                                                        }               
                                }   
                    </script>       

Answer 1

楼上：
把var       str       =       document.all(   "MyRadioButton ").value;   
改成
 var        str       =       document.getelementbyname(       "MyRadioButton   ").value;  
还是一样的结果。str始终为null!