Ubuntu javascript-general

Why don't you simply use tinymce.get('jander').getContent(); (tinymce in lowercases!) ?

Per the documentation, you can listen to the show or shown events.

From The Documentation:

...

There is no an onClose, but there is an onRemove. This is fired when you close the popup:

marker.getPopup().on('remove', function() { //Your code here });

You should not be able to see FormData object contents in console, because its not serializable. You can check request payload instead, check "Network" tab in your browser dev tools,...

Modify the code to this:

loadStatusFromServer: function() {
    return $.ajax({
        url: this.props.url,
        dataType: 'json',
        success: function(data) {...