As default, jQuery UI does not support any events for touch devices. To be enable to run KEditor in touch devices, please use jQuery UI Touch Punch.
Note: Please place this plugin right after jQuery UI. Example:
<script type="text/javascript" src="./plugins/jquery-ui-1.12.1.custom/jquery-ui.min.js"></script>
<script type="text/javascript" src="./plugins/jquery-ui.touch-punch-0.2.3/jquery.ui.touch-punch.min.js"></script>