jQuery Making textfield only accept numeric values

[javascript]
$(document).ready(function() {
$("#txtboxToFilter").keydown(function(event) {
// Allow only backspace and delete
if ( event.keyCode == 46 || event.keyCode == 8 ) {
// let it happen, don’t do anything
}
else {
// Ensure that it is a number and stop the keypress
if (event.keyCode < 48 || event.keyCode > 57 ) {
event.preventDefault();
}
}
});
});
[/javascript]

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