JSFiddle - React, Tailwind, and code Playground
HTML
<input type="text" name="t1" />
<input type="text" name="t2" />
<input type="text" name="t3" />
<input type="text" name="t4" />
JavaScript
$('input').focus(function(){
alert("Focus is on input with name " + $(this).attr('name'));
});