$(document).ready(function(){
$(".onlyNumbers").keydown(function(event) {
if ( event.keyCode == 46 || event.keyCode == 8 || event.keyCode == 9 || event.keyCode == 27 || event.keyCode == 13 || (event.keyCode == 65 && event.ctrlKey === true) || (event.keyCode >= 35 && event.keyCode <= 39)) {
return;
}
else {
if (event.shiftKey || (event.keyCode < 48 || event.keyCode > 57) && (event.keyCode < 96 || event.keyCode > 105 )) {
event.preventDefault();
}
}
});
});
<input type="text" class="onlyNumbers" />
.onlyNumbers{
border:1px solid #555555;
border-radius:3px;
width:100px;
padding:5px;
color:#888888;
margin:20px;
}