How can I detect when the user is leaving my site, not just going to a different page?

Question

I have a handler for onbeforeunload

window.onbeforeunload = unloadMess;
function unloadMess(){
  var conf = confirm(\"Wait! Before you go, please share your          


        

Answer 1

If you are having issues because your website may have both absolute and relative local links, I have another solution (using jQuery):

Demo

/* EXTERNAL LINK WARNING
=========================================*/
$('a').on('click', function(e){
    e.preventDefault();
    var url = $(this).attr('href'),
        host = location.host;       
    if (url.indexOf(host) > -1 || url.indexOf('http','https') == -1){
        /* If we find the host name within the URL,
               OR if we do not find http or https, 
               meaning it is a relative internal link
            */
        window.location.href = url;
    } else {
        var warn = confirm('You\'re leaving the domain.\n\nAre you sure?');
        if(warn == true) {
            window.location.href = url,'_blank';
        } else {
            e.preventDefault;
        }
    }
});