JSFiddle - React, Tailwind, and code Playground
HTML
<form id="test" name="target">
<a href="javascript:return(false);" class="add">Add</a>
<button type="submit">submit</button>
</form>
JavaScript
$(document).ready(function() {
$('.add').click(function() {
par_id = $(this).parent().attr('id');
count = $("#" + par_id + "> input").length;
$(this).parent().append("<br/><input type='text' name='" + count.toString() + "'>");
});
});