JSFiddle - React, Tailwind, and code Playground

HTML

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

JavaScript

var input_field = document.getElementById('the_id');

input_field.addEventListener('change', function() {
    var v = parseFloat(this.value);
    if (isNaN(v)) {
        this.value = '';
    } else {
        this.value = v.toFixed(2);
    }
});