Loading Gif in Settings

Hi,

The loading gif inside the settings reading page is not showing when the user click for a new group. I have inspected the code and find this piece that has to change:

$.post(ajaxurl, data, function(response){
	...
}

//Disable loading icon and enable button
$('#spnAddRG').hide();
$('#btnAddNewRG').attr('disabled', false);
document.getElementById("jv-new-reading-group-text").value = '';

change to:

$.post(ajaxurl, data, function(response){
	...
	//Disable loading icon and enable button
	$('#spnAddRG').hide();
	$('#btnAddNewRG').attr('disabled', false);
	document.getElementById("jv-new-reading-group-text").value = '';
}

https://ww.wp.xz.cn/plugins/wp-jv-post-reading-groups/