JSFiddle - React, Tailwind, and code Playground

by chrisbenseler

HTML

<form action="anything.html" target="_blank">
    <input type="text" id="field1" name="par1" required  />
    <input type="text" id="field2" name="par2" required />
    
    <input type="text" id="willbehidden" name="concatpars" />
    
    <button>send</button>
</form>

JavaScript

$("form").on("submit", function() {
    $("#willbehidden").val( $("#field1").val() + $("#field2").val() )
});