checkboxList判断是否被选中

 

          页面：

       checkboxlist标签 course

       cs：

             var num=0
                 for (var i = 0; i < document.aspnetForm.elements.length; i++) {
                     var e = document.aspnetForm.elements[i];
                     if ((e.type == 'checkbox') && e.name.indexOf('course') >= 0 && (e.checked == true))
                     {
                         num=1;
                     }
                 }

                 if (num>0) {

                     return true;
                 } else {
                     alert("主讲课程不能为空");
                     return false;
                 }