external.js

$(document).ready(function() {
    
    function titleModified(titleEl) {
        alert("Title modifed");
        alert(titleEl.text)
    }
    
    var titleEl = document.getElementsByTagName("title")[0];
    var docEl = document.documentElement;

    if (docEl && docEl.addEventListener) {
        docEl.addEventListener("DOMSubtreeModified", function(evt) {
            var t = evt.target;
            if (t === titleEl || (t.parentNode && t.parentNode === titleEl)) {
                titleModified(titleEl);
            }
        }, false);
    } else {
        document.onpropertychange = function() {
            if (window.event.propertyName == "title") {
                titleModified();
            }
        };
    }
    
    $('body').on('click', '#update_datatables', function() {
//         alert("babababa");  
        
        $('#version_table').DataTable().destroy();
        $('#version_table').DataTable().draw();
//         console.log($('#version_table'));
    });    
} );