Only Number
HTML
<input class="numericOnly" type="text" >
JavaScript
$('.numericOnly').on("keypress",
function (event) {
var regex = /[0-9]/g;
var charCode = event.charCode || event.keyCode;
var key = String.fromCharCode(charCode);
if (charCode == 8 || charCode == 9 || charCode == 13 || regex.test(key)) {
return true;
}
return false;
});