input.keydown(function (evt) {

                     evt.stopPropagation();

                     if (

                         // Allow: backspace, delete, tab, escape, enter and .

                         $.inArray(evt.keyCode, [46, 8, 9, 27]) !== -1 ||

                         // Allow: Ctrl+A

                         (evt.keyCode === 65 && evt.ctrlKey === true) ||

                         // Allow: home, end, left, right

                         (evt.keyCode >= 35 && evt.keyCode <= 39)) {

                         // let it happen, don't do anything

                         return;

                     } else if (evt.shiftKey || (evt.keyCode < 48 || evt.keyCode > 57) && (evt.keyCode < 96 || evt.keyCode > 105)) {

                         if (evt.keyCode == 13) {

                             if (/^[0-9]*[1-9][0-9]*$/.exec(input.val()) && parseInt(input.val()) <= parseInt(pageCountEle.val())) {

                                 pageNoEle.val(input.val());

                                 jsMethodName();

                             } else {

                                 alert("Please input a valid number!");

                                 input.focus();

                                 return false;

                             }

                         }

                         evt.preventDefault();

                     }

                 });