JSFiddle - React, Tailwind, and code Playground

HTML

<span id="nodisponible"></span>
<form action="pagina.php">
    <input type="submit" id="submit" value="enviar">
</form>

JavaScript

$("#submit").on("click",function(e){
    if($("#nodisponible").length > 0){
       e.preventDefault();
    }
});