I've ran into an issue with CKEditor 4 and jQuery UI's sortable method where if I sort a container that has a CKEditor instance, it removes the value and throws an error "Uncaught TypeError: Cannot call method 'getSelection' of undefined". It also makes the editor uneditable. I was able to get around this in CKEditor 3 with one of the following hacks found here: CKEditor freezes on jQuery UI Reorder
In looking at the Chrome DOM inspector, it appears that the contents of the iframe are removed.
Below is crude test code:
<html>
<head>
<title>test</title>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js"></script>
<script src="//ajax.googleapis.com/ajax/libs/jqueryui/1.8.24/jquery-ui.min.js"></script>
<script src="ckeditor.js"></script>
<script type="text/javascript">
$(function(){
var tmpStore = {};
$('#sortable').sortable({
cursor: 'move',
// Hack that use to work on V3 but not on V4:
// https://stackguides.com/questions/3379653/ckeditor-freezes-on-jquery-ui-reorder
start:function (event,ui) {
$('textarea').each(function(){
var id = $(this).attr('id');
tmpStore[id] = CKEDITOR.instances[id].getData();
})
},
stop: function(event, ui) {
$('textarea').each(function(){
var id = $(this).attr('id');
CKEDITOR.instances[id].setData(tmpStore[id]);
})
}
});
$('textarea').each(function(){
var ckId = $(this).attr('id');
config = {};
CKEDITOR.replace(ckId, config);
})
})
li { padding: 10px; width: 800px; height: 300px; }
</head>
<body>
<ul id="sortable">
<li><textarea id="test1" name="test1">test1</textarea></li>
<li><textarea id="test2" name="test1">test2</textarea></li>
<li><textarea id="test3" name="test1">test3</textarea></li>
</ul>
</body>
</html>