CheckBox 选中判断及单选实现功能

 

            // /功能：判断是否有选中项；
             // /参数：frm - 当前表单Form；idVal - 要查找的CheckBox的id；
             // /返回：True/False；
             // /调用：<INPUT type="submit" value="提交" id="btnS" runat="server" 
                                    onclick="JavaScript:return confirmSel(this.form, 'chkSel');">
             // /说明：'chkSel' - 将判断所有id包含'chkSel'的控件；
             function  confirmSel(frm, idVal) 
            {        
                 //  loop through all elements
                 var  IsChecked;
                IsChecked = false ;
                 for  (i = 0 ; i < frm.length; i ++ ) 
                {
                     //  Look for our checkboxes only
                     if  (frm.elements[i].id.indexOf (idVal)  !=- 1 ) 
                    {                
                         //  If any are checked then confirm alert, otherwise nothing happens
                         if (frm.elements[i].checked) 
                        {
                            IsChecked = true ;
                             return   true ;
                             // return confirm ('确定要提交所选择的记录吗？')
                        }                    
                    }
                }            
                 if (IsChecked == false )
                {
                    alert('请选择要进行操作的行 !!! ');
                     return   false ;                    
                }
            }
            
             // /功能：对CheckBox实现单选功能；
             // /参数：frm - 当前表单Form；chkVal - 当前CheckBox状态:选中True,不选中False；idVal - 当前CheckBox的id；
             // /返回：True/False；
             // /调用：<input type="checkbox" id='chkSel' onpropertychange='JavaScript:selChk(this.form,this.checked,this.id);' title="" runat="Server">            
             // /说明：hdnChkID - Hidden隐藏框，用于存放上次选中项CheckBox的id；
             function  selChk(frm,chkVal,idVal)
            {                        
                 if (chkVal  ==   true )  //如果当前CheckBox被选中
                {         
                     //将上次选中的CheckBox的id赋给变量lstChkID                        
                     var  lstChkID  =  document.getElementById( " hdnChkID " ).value;
                     //记录当前CheckBox的id
                    document.getElementById( " hdnChkID " ).value  =  idVal;
                     if (lstChkID != '')
                    {
                        document.getElementById(lstChkID).checked  =   false ;
                    }
                }                    
            }