JSFiddle - React, Tailwind, and code Playground

by Dedi Wibisono

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<div class="right" id="staticNumber">
			<input type="text" id="front" disabled value="+62" />
			<input type="text" id="back" />
</div>

JavaScript

$(function() {
		  $('#staticNumber').on('keydown', '#back', function(e){-1!==$.inArray(e.keyCode,[46,8,9,27,13,110,190])||/65|67|86|88/.test(e.keyCode)&&(!0===e.ctrlKey||!0===e.metaKey)||35<=e.keyCode&&40>=e.keyCode||(e.shiftKey||48>e.keyCode||57<e.keyCode)&&(96>e.keyCode||105<e.keyCode)&&e.preventDefault()});
		});