Followwing setup will use Spin.js instead of loading animation gif.
Make sure that you loaded Spin.js before setup.
$(function(){ $.ui.domwindowdialog.setup({ width: 600, // dialog width height: 300, // dialog height spinjs: true // make this true to use spin.js }); });
<a class="apply-domwindow-open" href="dialog1.html" data-domwindow-ajaxdialog="true" >open</a>