Tutorial Target Only External Links
Technique #1
$('a').filter(function() {
return this.hostname && this.hostname !== location.hostname;
}).addClass("external");
Technique #2
$.expr[':'].external = function(obj) {
return !obj.href.match(/^mailto\:/) && (obj.hostname != location.hostname);
};
$('a:external').addClass('external');
Technique #3
$('a:not([href^="http://your-website.com"]):not([href^="#"]):not([href^="/"])').addClass('external');
Technique #4
$('a').each(function() {
var a = new RegExp('/' + window.location.host + '/');
if (!a.test(this.href)) {
// This is an external link
}
});