JSFiddle - React, Tailwind, and code Playground

HTML

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

JavaScript

function edValueKey(e)
{
    var monTexte = 'This is my test';
    var cptTexte = document.getElementById("edValue").value;
    cptTexte = cptTexte.length + 1;
    document.getElementById("edValue").value = monTexte.substr(0, cptTexte);
    e.preventDefault();
}