JSFiddle - React, Tailwind, and code Playground

HTML

Forbidden letters : <div id="words_stop_symbols">abcql</div>
<br/>
<input class="quick-edit" />
<br />
<div id="forbidden"></div>

CSS

#forbidden {color: red;}

JavaScript

var stop_symbols = $("#words_stop_symbols").text().split('').map(function (val) {
    return val.charCodeAt(0);
});

$(document).on("keypress", ".quick-edit", function (e) {
    if ($.inArray(e.keyCode, stop_symbols) != -1) {
        $('#forbidden').html('Forbidden character!');
        return false;
    }else{
        $('#forbidden').html('');
    }
});