JSFiddle - React, Tailwind, and code Playground

HTML

<input type="checkbox" />
<br />
<input type="checkbox" />
<br />
<input type="checkbox" />
<br />
<input type="submit" value="Verwijder" />

JavaScript

$('input[type="checkbox"]').click(function () {
    $("input[type=submit]").val("Delete " + $('input:checkbox:checked').length + " rows");
});