JSFiddle - React, Tailwind, and code Playground

by rajeevRF

HTML

<form action="">
<input type="number" name="quantity" id="quantity" />
<input type="number" name="amount" id="amount" readonly />
<input type="submit" value="Submit">
</form>

JavaScript

$(document).ready(function(){
    $('#quantity').keyup(function(){
        var qty = $('#quantity').val();

        $('#amount').val(qty * 50);    
    }); 
    });