JSFiddle - React, Tailwind, and code Playground

HTML

<input id="inp" type="text" />

JavaScript

function inArray(value, arr) {
    for(var i = 0; i < arr.length; i++) {
        if (value === arr[i]) {
            return i;
        }
    }
    return -1;
}

function onlyNumbers(evt) {
    // SOME OPTIONS LIKE ENTER, BACKSPACE, HOME, END, ARROWS, ETC.
    var arrayExceptions = [8, 13, 16, 17, 18, 20, 27, 35, 36, 37, 38, 39, 40, 45, 46, 144];
    if ((evt.keyCode < 48 || evt.keyCode > 57) &&
        (evt.keyCode < 96 || evt.keyCode > 106) && // NUMPAD
        inArray(evt.keyCode, arrayExceptions) === -1) {
        return false;
    }
}

document.getElementById('inp').onkeydown = onlyNumbers;