JSFiddle - React, Tailwind, and code Playground

by Robert N.

HTML

Test1: <input type="text" name="test1" id="test1"/>
Test2: <input type="text" name="test2" id="test2"/>
<br/><br/>
Test3: <input type="text" name="test3" id="test3">

JavaScript

$('#test1,#test2').change(function(){
    data_arr='{Value1:'+$('#test1').val()+',Value2:'+$('#test2').val()+'}';
    $('#test3').val(data_arr);
})