JSFiddle - React, Tailwind, and code Playground

by alexflav23

HTML

<input type="text" name="theinput" id="userinput"/>
<button id="submit">Validate</button>

JavaScript

var validNumbers = {
     "2474": 2474,
     "2750": 2750,
     "2753": 2753,
     "2760": 2760,
     "2777": 2777
 };
function validate(num) {
    return typeof validNumbers[num] !== "undefined";
};

var button = document.getElementById("submit"),
    userInput = document.getElementById("userinput");
button.onclick = function(event) {
    alert(validate(userInput.value));
};