JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" class="myTexbox" />

JavaScript

$(document).ready(function() {
    var oldVal = '';
    $('.myTexbox').keypress(function (event) {
        if (this.value.match("^[0-9]*[.,]?[0-9]{0,2}$"))
            oldVal = this.value;
    });
     $('.myTexbox').keyup(function (event) {
        if (!this.value.match("^[0-9]*[.,]?[0-9]{0,2}$")) {
            $('.myTexbox').val(oldVal);   
        }
    });
});