JSFiddle - React, Tailwind, and code Playground

HTML

<li><a href="#">Master</a>
    <ul>
        <li><a href="http://html-color-codes.info/">Website 1</a></li>
        <li><a href="http://www.w3schools.com/">Website 2</a></li>
        <li><a href="Item.jsp">Item</a></li>
    </ul>
</li>
<li><a href="#">Transaction</a>
    <ul>
        <li><a href="Purchase.jsp">Purchase</a></li>
        <li><a href="Sales.jsp">Sales</a></li>
    </ul>
</li>
<li><a href="Contact.jsp">Contact</a></li>
<br />
<iframe src="" height="300" width="500"></iframe>

JavaScript

$(document).ready(function () {
    $('a').click(function () {
        var target = $(this).attr('href');
        $('iframe').attr('src', target);
        return false;
    });
});