JSFiddle - React, Tailwind, and code Playground
by Ryan Perez
HTML
<p id="name1">Ryan</p>
<p id="name2">Perez</p>
<button value="test">test</button>
<form action="action_page.php" method="post" target="_blank">
First name:<br>
<input type="text" id="firstname" name="firstname" >
<br>
Last name:<br>
<input type="text" id="lastname" name="lastname" >
<br><br>
<input type="submit" id="submit" value="Submit">
</form>
JavaScript
$( "button" ).click(function() {
var name1 = $( '#name1' ).text();
var name2 = $( '#name2' ).text();
$( "#firstname" ).val( name1 );
$( "#lastname" ).val( name2 );
$('#submit').click();
});