Prevent typing non-numeric in input type number

You can accomplish this by preventing the keyPress event from occurring for non-numeric values

e.g (using jQuery)

$('.input-selector').on('keypress', function(e){
  return e.metaKey || // cmd/ctrl
    e.which <= 0 || // arrow keys
    e.which == 8 || // delete key
    /[0-9]/.test(String.fromCharCode(e.which)); // numbers
})

This accounts for all different types of input (e.g. input from the number pad has different codes than the keyboard) as well as backspace, arrow keys, control/cmd + r to reload etc

Please note that e.which, e.keyCode and e.charCode are deprecated: https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/which

I prefer e.key:

document.querySelector("input").addEventListener("keypress", function (e) {
    var allowedChars = '0123456789.';
    function contains(stringValue, charValue) {
        return stringValue.indexOf(charValue) > -1;
    }
    var invalidKey = e.key.length === 1 && !contains(allowedChars, e.key)
            || e.key === '.' && contains(e.target.value, '.');
    invalidKey && e.preventDefault();});

This function doesn't interfere with control codes in Firefox (Backspace, Tab, etc) by checking the string length: e.key.length === 1.

It also prevents duplicate dots at the beginning and between the digits: e.key === '.' && contains(e.target.value, '.')

Unfortunately, it doesn't prevent multiple dots at the end: 234....

It seems there is no way to cope with it.

Try preventing the default behaviour if you don't like the incoming key value:

document.querySelector("input").addEventListener("keypress", function (evt) {
    if (evt.which < 48 || evt.which > 57)
    {
        evt.preventDefault();
    }
});