JavaScript разрешают числа
function onlyNumbers(e) {
// Check if the user pressed a number
if (e.which != 8 && e.which != 0 && (e.which < 48 || e.which > 57)) {
// If the user pressed a number, prevent the default action
e.preventDefault();
}
// Then, add the event listener to the input
document.getElementById("input").addEventListener("keypress", onlyNumbers);
// If the key pressed is not a number, prevent the default action
if (e.which != 8 && e.which != 0 && (e.which < 48 || e.which > 57)) {
e.preventDefault();
}
// If the key pressed is a number, allow the default action
if (e.which == 8 || e.which == 0 || (e.which >= 48 && e.which <= 57)) {
return;
}
}
// Call the function
onlyNumbers(e);
Old-fashioned Otter
