JSFiddle - React, Tailwind, and code Playground
by naokiota
HTML
<form class="myform">
<input type="text" id="some_input">
<input type="submit">
</form>
JavaScript
$('.myform').submit(function(e){
// Do something.
e.preventDefault();
$('.myForm #some_input').val("Hi!");
// Then submit the form as normal.
});