JSFiddle - React, Tailwind, and code Playground

HTML

<input id="edValue" type="text" onKeyUp="edValueKey()">

JavaScript

function edValueKey()
{
    var monInput = document.getElementById("edValue");
    var monTexte = 'This is my test';
    var cptTexte = monInput.value;
    monInput.value = monTexte.substr(0, cptTexte.length);
}