JSFiddle - React, Tailwind, and code Playground
by mohammadAdil
HTML
<input type='text' name='firstname' testdata='John'>
<input type='text' name='lastname' testdata='Smith'>
<input type='text' name='lastname'>
JavaScript
$("input[testdata]").each(function(){
$('body').append($(this).attr('testdata')+",");
// do your stuff
});